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Journal articles on the topic 'Ewes Nutrition'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 January 2023

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1

Kenyon, P. R., S. J. Pain, P. G. Hutton, C. M. C. Jenkinson, S. T. Morris, S. W. Peterson, and H. T. Blair. "Effects of twin-bearing ewe nutritional treatments on ewe and lamb performance to weaning." Animal Production Science 51, no. 5 (2011): 406. http://dx.doi.org/10.1071/an10184.

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Nutrition of the ewe at various stages of pregnancy is known to affect ewe and offspring performance. However, little is known regarding the potential interactions among differing maternal nutrition regimens in early and mid–late pregnancy. The objective of the present study was to examine the effects and potential interactions of three pastoral nutritional treatments from Day 21 of pregnancy (P21) to P50 (Sub-maintenanceP21–50 (total liveweight change achieved, SMP21-50, –0.15 ± 0.02 kg/day) v. MaintenanceP21–50 (MP21-50,–0.02 ± 0.02 kg/day) v. Ad libitumP21–50 (AdP21-50,0.15 ± 0.02 kg/day) a

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2

Young, J. M., R. Behrendt, M. Curnow, C. M. Oldham, and A. N. Thompson. "Economic value of pregnancy scanning and optimum nutritional management of dry, single- and twin-bearing Merino ewes." Animal Production Science 56, no. 4 (2016): 669. http://dx.doi.org/10.1071/an15202.

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The nutritional requirements of twin-bearing ewes are ~25% greater than those of ewes with single fetuses during late pregnancy and nearly twice those of non-pregnant ewes. Underfeeding ewes, resulting in liveweight loss during late pregnancy, can have adverse effects on the production and survival of both the lamb and the ewe, and improving twin-lamb survival is critical to improving the overall reproductive performance of the National Merino flock. Scanning for pregnancy status and litter size allows for more precise management of the nutrition of the ewe flock according to the different nut

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Thompson, A. N., M. B. Ferguson, D. J. Gordon, G. A. Kearney, C. M. Oldham, and B. L. Paganoni. "Improving the nutrition of Merino ewes during pregnancy increases the fleece weight and reduces the fibre diameter of their progeny's wool during their lifetime and these effects can be predicted from the ewe's liveweight profile." Animal Production Science 51, no. 9 (2011): 794. http://dx.doi.org/10.1071/an10161.

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Nutrition of ewes during pregnancy can have permanent impacts on the production potential of their progeny. The hypothesis tested in the experiments reported in this paper was that improving the nutrition of Merino ewes during pregnancy and lactation increases the fleece weight and reduces the fibre diameter of their progeny’s wool during their lifetime. In addition, that these effects on the progeny’s wool production can be predicted from the ewe’s liveweight profile. At sites in Victoria and Western Australia in each of 2 years, a wide range in the liveweight and condition score profiles of

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Kenyon, P. R., R. A. Corner-Thomas, S. W. Peterson, S. J. Pain, and H. T. Blair. "Pregnancy nutrition does not influence lamb liveweight in developmentally programmed ewes." Animal Production Science 54, no. 9 (2014): 1465. http://dx.doi.org/10.1071/an14217.

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In sheep, maternal nutrition can affect the offspring’s milk production at its first lactation and the grand-offspring’s liveweight to weaning. However, this apparent developmental programming effect on milk production and grand-offspring liveweight has not persisted. Therefore, the aim of the present study was to determine if nutrition of the programmed ewe in mid- to late pregnancy affected this response. Developmentally programmed ewes (G1) that had been born from dams (G0) offered submaintenance, maintenance or ad libitum feeding levels from Day 21 to Day 50 of pregnancy and then either pr

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Jenkinson, C. M. C., A. K. Earl, P. R. Kenyon, and H. T. Blair. "Effects of maternal nutrition during pregnancy on fetal growth and maternal constraint in sheep." Animal Production Science 52, no. 7 (2012): 524. http://dx.doi.org/10.1071/an11245.

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This study set out to determine the stage of gestation at which maternal constraint on fetal growth occurs and whether pregnancy nutritional level could alleviate that constraint. One-hundred and thirty-eight Cheviot (C) and 114 Suffolk (S) ewes were split into two groups and bred with either 12 S or 12 C rams to generate four ewe/fetal groups CC (C dam and C sire), CSinC (crossbred fetus in C ewe), CSinS, and SS. At Day 21 of pregnancy (P21), half of the ewes in each of the four groups were randomly allocated to either a maintenance (M) or ad libitum (A) nutritional treatment, under pastoral

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Parr, R. A., A. H. Williams, I. P. Campbell, G. F. Witcombe, and A. M. Roberts. "Low nutrition of ewes in early pregnancy and the residual effect on the offspring." Journal of Agricultural Science 106, no. 1 (February 1986): 81–87. http://dx.doi.org/10.1017/s0021859600061773.

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SUMMARYMature Merino ewes (n = 500) were allotted at random to embryo removal (day 35; day 0 = day of oestrus detection), foetal removal (day 90) or lambing groups. These groups were further randomly divided into four single-sire mating groups. From day 1 until day 35 ewes were individually penned and fed either 50 or 150% of a maintenance ration (0·5 M or 1·5 M respectively). At day 35 single embryos were removed from anaesthetized ewes in the embryo removal group and all other ewes were endoscoped to confirm pregnancy. These ewes were then returned to pasture. Plasma samples were taken from

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7

Kenyon, P. R., R. E. Hickson, P. G. Hutton, S. T. Morris, K. J. Stafford, and D. M. West. "Effect of twin-bearing ewe body condition score and late pregnancy nutrition on lamb performance." Animal Production Science 52, no. 7 (2012): 483. http://dx.doi.org/10.1071/an12085.

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This study aimed to investigate the effects of ewe body condition score and nutrition on twin-bearing ewes and their offspring. At maximum Day 112 of pregnancy (range 96–112 days), 185 twin-bearing ewes were allocated to either a ‘Medium’ or ‘ad libitum’ (Adlib) feeding treatment for the following 25 days (P112–P136). Each feeding treatment included ewes of body condition score: 2.0 (CS2.0, Medium n = 32, Adlib n = 28), CS2.5 (Medium n = 31, Adlib n = 33) or CS3.0 (Medium n = 30, Adlib n = 31). After P136 ewes were offered Adlib feeding conditions. Medium treatment ewes were lighter (P < 0.

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8

Gunn, R. G., A. J. F. Russel, and E. Barthram. "A note on the effect of nutrition during mid pregnancy on lamb production of primiparous ewes in high body condition at mating." Animal Science 43, no. 1 (August 1986): 175–77. http://dx.doi.org/10.1017/s000335610001847x.

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Mid-Pregnancy nutrition has been shown to have both positive and negative effects on lamb birth weight in primiparous Scottish Blackface ewes. The direction of the effect depends on the level of body condition at mating, being negative in ewes in high body condition (Russel, Foot, White and Davies, 1981). In the same study, it was argued that the effect in younger ewes could be due to their greater sensitivity to both under- and over-nutrition during the earlier to mid stages of their first pregnancy than is evident in older ewes. Russel et al. (1981) also suggested that the level of mid-pregn

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Corner, R. A., P. R. Kenyon, K. J. Stafford, D. M. West, N. Lopez-Villalobos, S. T. Morris, and M. H. Oliver. "Effect of nutrition from mid to late pregnancy on the performance of twin- and triplet-bearing ewes and their lambs." Australian Journal of Experimental Agriculture 48, no. 5 (2008): 666. http://dx.doi.org/10.1071/ea07033.

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This experiment was conducted to determine the effect of two different feeding levels on ewes during mid and late pregnancy on lamb birthweight and growth to weaning. Twin- and triplet-bearing Romney ewes (n = 80 and 56, respectively) were allocated to one of two feeding regimes and provided pastures with an average sward height of less than 2 cm (~700 kg dry matter/ha) or greater than 4 cm (~1300 kg dry matter/ha). Ewes were allocated to these feeding regimes during mid pregnancy (day 70–107 of pregnancy; P70–P107) and were reallocated in late pregnancy (P108–P147). This resulted in four swar

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Behrendt, R., J. E. Hocking Edwards, D. Gordon, M. Hyder, M. Kelly, F. Cameron, J. Byron, M. Raeside, G. Kearney, and A. N. Thompson. "Offering maternal composite ewes higher levels of nutrition from mid-pregnancy to lambing results in predictable increases in birthweight, survival and weaning weight of their lambs." Animal Production Science 59, no. 10 (2019): 1906. http://dx.doi.org/10.1071/an18505.

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Management of nutrition during pregnancy for maternal composite ewes has the potential to improve lamb production and survival in prime lamb production systems but existing condition score (CS) guidelines developed for Merinos may not be appropriate for the optimum production of maternal ewes. To address this, three replicated experiments were conducted at two research sites in Victoria and one in Western Australia. Ewes (781–800 per site) were allocated to four CS treatments following pregnancy scanning (~Day 50) and differentially fed to reach approximate targets of CS 2.4, 2.8, 3.2 and 3.6

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Fogarty, NM, DG Hall, and PJ Holst. "The effect of nutrition in mid pregnancy and ewe liveweight change on birth weight and management for lamb survival in highly fecund ewes." Australian Journal of Experimental Agriculture 32, no. 1 (1992): 1. http://dx.doi.org/10.1071/ea9920001.

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The effect of moderate undernutrition in mid pregnancy on lamb birth weight and survival of single- and multiple-bearing ewes is reported. A total of 1220 ewes of 3 crossbred types with different fecundity, Booroola Merino x Dorset (BD), Trangie Fertility Merino x Dorset (TD) and Border Leicester x Merino (BLM), were examined over 2 years. The treatments were low (L) and high (H) nutrition at pasture for 4 weeks from about day 75 of pregnancy. Ewe liveweight of the L group at the end of the treatments was 5 kg lower in 1984 and 8 kg lower in 1985 (P<0.01) than the H group. The differences w

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Edwards, J. E. Hocking, K. J. Copping, and A. N. Thompson. "Managing the nutrition of twin-bearing ewes during pregnancy using Lifetimewool recommendations increases production of twin lambs." Animal Production Science 51, no. 9 (2011): 813. http://dx.doi.org/10.1071/an09158.

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The effect on ewe and lamb production by differential management of single- and twin-bearing Merino ewes during pregnancy and lactation was examined. The hypothesis that the survival and productivity of single- and twin-born progeny is not affected by differential management of single- and twin-bearing ewes was tested. To test this hypothesis, two ewe flocks were monitored on a commercial property in the south-east of South Australia. The body condition score of one flock of ewes was managed according to Lifetimewool recommendations for southern Australian (Lifetimewool flock; n = 464). Lifeti

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Behrendt, R., A. J. van Burgel, A. Bailey, P. Barber, M. Curnow, D. J. Gordon, J. E. Hocking Edwards, C. M. Oldham, and A. N. Thompson. "On-farm paddock-scale comparisons across southern Australia confirm that increasing the nutrition of Merino ewes improves their production and the lifetime performance of their progeny." Animal Production Science 51, no. 9 (2011): 805. http://dx.doi.org/10.1071/an10183.

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Experiments conducted by Lifetimewool at plot-scale have shown that differences in the maternal liveweight during pregnancy and lactation (liveweight profiles) of individual Merino ewes influences their wool production and reproductive rate as well as the birthweight, survival, weaning weight and lifetime wool production of their lambs in a predictable manner. This study determined whether these impacts of nutrition of the ewe on ewe and progeny performance are measurable on commercial properties across southern Australia at a paddock-scale where ewes were aggregated into flocks with a greater

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14

Kenyon, P. R., S. T. Morris, K. J. Stafford, and D. M. West. "Effect of ewe body condition and nutrition in late pregnancy on the performance of triplet-bearing ewes and their progeny." Animal Production Science 51, no. 6 (2011): 557. http://dx.doi.org/10.1071/an10192.

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The aim of the present study was to determine the production response of triplet-bearing ewes and their lambs to two differing feeding treatments in mid to late pregnancy and to determine the effect of ewe body condition. Ninety-two days after the start of their breeding period (P92) triplet-bearing ewes, were allocated to either a Medium (n = 72) or ad libitum (‘Adlib’, n = 72) feeding treatment until P113, followed by both groups being merged and offered ad libitum feeding conditions until lambing. The Medium feeding treatment was designed to ensure pre- and postgrazing herbage masses were b

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15

Annett, R. W., and A. F. Carson. "Effects of plane of nutrition during the first month of pregnancy on conception rate, foetal development and lamb output of mature and adolescent ewes." Animal Science 82, no. 6 (December 2006): 947–54. http://dx.doi.org/10.1017/asc2006111.

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AbstractEmbryo transfer studies have demonstrated that high plane feeding in early pregnancy is detrimental to the successful establishment of pregnancy in adolescent but not mature ewes. To further examine this relationship with ewes that conceive naturally and to investigate its effects on foetal development, 102 Greyface and Texel×Greyface ewes (body condition score (BCS) 3·8) and 114 Texel×Greyface adolescent ewes (BCS 3·3) were allocated to one of three treatments following a synchronized mating. From day 1 to 31 of pregnancy, animals were offered grass nuts (10·2 MJ metabolizable energy

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Pain, S. J., D. S. van der Linden, P. R. Kenyon, and H. T. Blair. "Does dam pre-breeding nutrition and/or birth rank affect the glucose and fat metabolism of 18-month-old female offspring?" Animal Production Science 52, no. 7 (2012): 546. http://dx.doi.org/10.1071/an11294.

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Twin- and triplet-born lambs are smaller and lighter at birth than singletons and remain so until at least 1 year of age. However, there is little evidence in the literature to demonstrate if these smaller/lighter twin- and triplet-born lambs are metabolically different to singletons later in life. Additionally, many studies have demonstrated that dam nutrition during the periconceptual period can program the fetus in utero, influencing development, growth and performance later in life. However, little is known regarding the impact of differing levels of maternal nutrition before the periconce

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Dawson, L. E. R., A. F. Carson, D. J. Kilpatrick, and A. S. Laidlaw. "Effect of herbage allowance and concentrate food level offered to ewes in late pregnancy on ewe and lamb performance." Animal Science 81, no. 3 (December 2005): 413–21. http://dx.doi.org/10.1079/asc41950413.

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AbstractTwo experiments were undertaken to investigate the effect of herbage allowance and concentrate food level offered to twin-bearing ewes in the last 6 weeks of pregnancy on ewe and lamb performance. In each study, 96 twin-bearing Greyface (Border Leicester × Scottish Blackface), Rouge × Greyface and Texel × Greyface ewes were used. In experiment 1, the ewes were allocated to eight treatments consisting of two herbage allowances (1·3 and 2·6 kg herbage dry matter per ewe per day) and four concentrate food levels ranging from zero to 1000 g per day. In experiment 2, ewes were offered four

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18

Kassem, R., J. B. Owen, and I. Fadel. "A note on the characteristics of oestrus and ovulation in Awassi ewes." Animal Science 50, no. 1 (February 1990): 198–201. http://dx.doi.org/10.1017/s000335610000461x.

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The length of the oestrous cycle observed in 20 ewe lambs and 424 ewes of the Awassi breed gave mean values of 16·4 (s.d. 1·31) days for ewe lambs and 17·4 (s.d. 1·84) days for ewes. Plane of nutrition did not affect cycle length in ewe lambs and age of ewe (from 2 to 5 years) did not affect oestrous cycle length in ewes (P > 0·05). Of 40 ewes treated with progesterone intravaginal sponges 33 (83%) showed oestrus and 28 (70%) ovulated at the first (synchronized) and 31 (78%) and 30 (75%) at the repeat oestrus. Mean duration of oestrus was 40·0 (s.d. 16·37) h (range 8 to 72) for the first an

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Jordan, DJ, and DG Mayer. "Effects of udder damage and nutritional plane on milk yield, lamb survival and lamb growth of Merinos." Australian Journal of Experimental Agriculture 29, no. 3 (1989): 315. http://dx.doi.org/10.1071/ea9890315.

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A pen study investigated the effects of udder damage and 3 levels of nutrition (110, 90 and 70% of maintenance requirements) during the pre- and post-natal period on the performance of Merino ewes and lambs. Udder damage (only 1 functional teat) significantly reduced (P< 0.05) estimated daily milk yield of ewes (1 139 v. 963 mL/day), growth rate (180.5 v. 143.7 g/ day) and liveweight of lambs (10.1 v. 8.8 kg) at 4-6 weeks of age. Lamb survival was significantly reduced only in the 70% of maintenance treatment (82.2 v. 64.8%). Nutrition level significantly (P< 0.05) affected ewe and lamb

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Holst, PJ, ID Killeen, and BR Cullis. "Nutrition of the pregnant ewe and its effect on gestation length, lamb birth weight and lamb survival." Australian Journal of Agricultural Research 37, no. 6 (1986): 647. http://dx.doi.org/10.1071/ar9860647.

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The nutrition of grazing, pregnant crossbred ewes was managed so that from 6-15 and from 15-20 weeks of pregnancy, ewes were offered either high (H) or low (L) quality and quantity of nutrition as provided by pasture. At one week prior to parturition, the ewes in each of the four treatment groups (HH, HL, LH, LL) were then placed onto good pasture for lambing. Differential nutrition during pregnancy significantly affected gestation length of the ewes, with HH ewes having the shortest gestation. By day 148, 1.6 times more HH ewes had lambed compared with the LL group ewes. Significant differenc

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Dwyer, Cathy M., Alistair B. Lawrence, Stephen C. Bishop, and Mitch Lewis. "Ewe–lamb bonding behaviours at birth are affected by maternal undernutrition in pregnancy." British Journal of Nutrition 89, no. 1 (January 2003): 123–36. http://dx.doi.org/10.1079/bjn2002743.

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Maternal undernutrition in pregnancy results in low birth-weights and impaired postnatal survival in sheep. Largely anecdotal evidence suggests that the expression of appropriate maternal and neonate behaviours may also be disrupted by undernutrition. In the present study, we investigated the effect of a moderate (35 %) reduction in ewe nutritional intake in pregnancy on the expression of ewe–lamb bonding behaviours in primiparous Scottish Blackface ewes. Low-intake (L) ewes had significantly higher plasma progesterone than high-intake (H) ewes from mid-gestation onwards (e.g. plasma progester

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Keady, T. W. J., and J. P. Hanrahan. "Effects of altering the plane of nutrition during the rearing phase and pregnancy of 2-tooth ewes, of two genotypes, on ewe and subsequent lamb performance." Proceedings of the British Society of Animal Science 2009 (April 2009): 70. http://dx.doi.org/10.1017/s1752756200029094.

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Ewe replacements are a major cost in sheep production. This cost is influenced by replacement rate and rearing expense which is a function of plane of nutrition offered during the first winter, subsequent grazing season prior to joining at 18 months of age and during pregnancy prior to lambing as 2-tooth ewes. There is a paucity of data on the impact of plane of nutrition between 6 months of age and first lambing as 2-tooth ewes on body size and subsequent productivity. The weight of lamb carcass produced per ewe, which is influenced by litter size, lamb survival and growth rate, is the main f

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Demmers, K. J., B. Smaill, G. H. Davis, K. G. Dodds, and J. L. Juengel. "Heterozygous Inverdale ewes show increased ovulation rate sensitivity to pre-mating nutrition." Reproduction, Fertility and Development 23, no. 7 (2011): 866. http://dx.doi.org/10.1071/rd10344.

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This study aimed to determine whether ewes heterozygous (I+) for the Inverdale mutation of the bone morphogenetic protein-15 (BMP15) gene with high natural ovulation rate (OR) show similar sensitivity to nutritional manipulation as non-carriers (++). Increasing pre-mating nutrition results in OR increases in sheep, but whether this effect occurs in ewes with naturally high OR is unknown. Over 2 years, I+ or ++ ewes were given high (ad libitum) or control (maintenance) pasture allowances for 6 weeks prior to mating at a synchronised oestrus, with OR measured 8 days later. The high group increas

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Robertson, S. M., B. J. King, M. B. Allworth, J. Rummery, and M. A. Friend. "The effect of peri-conceptual grazing of live pasture on fetal numbers in unsynchronised ewes." Animal Production Science 54, no. 8 (2014): 1008. http://dx.doi.org/10.1071/an13086.

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Methods of increasing the number of lambs born per ewe that avoid the use of pharmaceutical methods of oestrus synchronisation but which require a short period of increased nutrition are desirable. Four separate experiments evaluated whether peri-conceptual grazing of lucerne, compared with senescent herbage or other live herbage, increased fetal numbers in unsynchronised ewes. Merino ewes that grazed lucerne pasture for 7 days before joining and for the first 7 days of a 5–6-week joining produced up to 21 extra (P < 0.05) fetuses per 100 ewes joined, compared with ewes grazing cereal stubb

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van der Linden, D. S., P. R. Kenyon, C. M. C. Jenkinson, S. W. Peterson, and H. T. Blair. "Carry-over effects of ewe nutrition and birth rank during the previous pregnancy on the milking performance during the subsequent lactation of Romney ewes." Animal Production Science 51, no. 2 (2011): 102. http://dx.doi.org/10.1071/an10088.

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This study investigated whether selection for ewe size and nutrition during the previous pregnancy would affect the lactational performance of the ewe and liveweight gain of her lamb(s) in the subsequent year. A subgroup of singleton-bearing Romney ewes were milked once a week, for 7 consecutive weeks. Singleton-bearing ‘light’ ewes that gave birth to twins in the previous year had reduced milk yields from Day 21 of lactation (L21) onwards in the present year compared with those that gave birth to singletons in the previous year. Lambs born to light ewes had reduced liveweight gain from birth

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Gunn, R. G., D. A. Sim, and E. A. Hunter. "Effects of nutrition in utero and in early life on the subsequent lifetime reproductive performance of Scottish Blackface ewes in two management systems." Animal Science 60, no. 2 (April 1995): 223–30. http://dx.doi.org/10.1017/s1357729800008389.

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AbstractOver 3 years, a flock of Scottish Blackface ewes was managed so that one-third of the ewes received a high level of nutrition during the last 100 days of pregnancy (P), one-third received a high level of nutrition during the first 100 days of lactation (L) and one-third received a low level of nutrition as derived from a hill grazing over the same two periods (C). From these ewes, 496 ewe lambs were retained at weaning (19 to 22 weeks of age), balanced for treatment, year and birth type. At 6 months of age half of the lambs, similarly balanced, were transferred to an upland grazing sys

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Dove, H., M. Freer, and J. Z. Foot. "The nutrition of grazing ewes during pregnancy and lactation: relationships between herbage, supplement and milk intakes, and ewe and lamb liveweight and body composition." Animal Production Science 58, no. 7 (2018): 1253. http://dx.doi.org/10.1071/an16541.

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This paper reports results from a study of ewes in pregnancy and lactation, during which times they grazed at a high versus medium stocking rate and either received or did not receive a pelleted supplement. We measured ewe liveweight, condition score and body composition; intakes by ewes of pasture and supplementary feed; milk production by ewes, and; birthweight, milk intake, liveweight gain and body composition of single and twin lambs. Ewes grazing at the medium stocking rate consumed more pasture in late pregnancy and the intake of supplement significantly reduced pasture intake. Neverthel

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Orji, B. I., and J. Steinbach. "PUBERAL DEVELOPMENT IN THE NIGERIAN DWARF SHEEP." Nigerian Journal of Animal Production 7, no. 1 (January 14, 2021): 63–69. http://dx.doi.org/10.51791/njap.v7i1.2075.

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THE Incidence of the first behavioural oestrus (puberty) in 28 ewe lambs was investigated to determine the effect of the plane of nutrition on it. The ewes were randomly alloted and reared on two planes of nutrition: one exclusively on roughage (grazing and bay) the second roughage supplemented with concentrate at the rate of 454g a day from weaning to puberty. The ewe lambs were checked for standing heat with two vasectomised rams twice daily - mornings and evenings. The age and body weight at puberty and the average daily gain from weaning to puberty In unsupplemented ewes were 339.5 ± 7.8 d

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Tillquist, Nicole M., Amanda S. Reiter, Mia Y. Kawaida, Brandon I. Smith, Sarah A. Reed, Steven A. Zinn, and Kristen E. Govoni. "PSIII-24 Poor gestational nutrition impacts sheep offspring growth but not feed efficiency." Journal of Animal Science 99, Supplement_3 (October 8, 2021): 311. http://dx.doi.org/10.1093/jas/skab235.571.

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Abstract The objective was to determine the effects of poor maternal nutrition during gestation on growth and feed efficiency of offspring. We hypothesized that body weights (BW) would decrease and residual feed intake (RFI) would increase (reduced feed efficiency) in offspring of restricted- and over-fed ewes. Forty-six multiparous Dorset ewes pregnant with twins were fed 100%, 60% or 140% of NRC requirements from d 30 of gestation until parturition. Offspring are referred to as CON (n = 10 ewes; 12 rams), RES (n = 13 ewes; 21 rams), and OVER (n = 16 ewes; 13 rams), respectively. Lamb BW were

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Freitas-de-Melo, A., R. Ungerfeld, A. Orihuela, M. J. Hötzel, and R. Pérez-Clariget. "Early mother–young relationship and feeding behaviour of lambs are unaffected by low pasture allowance until the beginning of the last third of gestation in single-bearing ewes." Animal Production Science 58, no. 5 (2018): 930. http://dx.doi.org/10.1071/an16157.

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Nutrition during gestation influences ewes’ bodyweight (BW), the bond with their lamb, milk yield and lamb development, and thus feeding behaviour of lambs during postnatal rearing. The aim of this study was to determine if the level of native pasture allowance from before conception until the beginning of the last third of gestation of single-bearing ewes influences the ewe–lamb relationship at birth and the feeding behaviour of lambs during postnatal rearing. A second aim was to determine whether the nutritional treatments affect ewes’ milk yield and their lambs’ bodyweight. Eleven multiparo

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Hart, K. W., A. Chadwick, F. Sebe, P. Poindron, R. Nowak, and D. Blache. "Colostrum quality of ewes of calm temperament is not responsible for low lamb mortality." Australian Journal of Experimental Agriculture 46, no. 7 (2006): 827. http://dx.doi.org/10.1071/ea05348.

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Perinatal lamb mortality is a serious issue for the sheep industries. Starvation is implicated in many of these lamb deaths. Ewes with a calm temperament lose significantly fewer lambs than ewes with nervous temperament, particularly in the critical first 3 days after birth. Colostrum provides essential nutrition to neonatal lambs. This research set out to determine whether ewe temperament affects the quantity and quality of colostrum that ewes produce. Calm temperament was found to have an influence on the viscosity of colostrum 6 h after birth. High variability in all aspects of colostrum pr

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Sarvinda, Diahanvika Tri, Sigit Bintara, I. Gede Suparta Budisatria, Kustantinah Kustantinah, and Endang Baliarti. "The Effect of Flushing Premating with Spirulina Platensis Supplementation on Ewes Postpartum Estrus." Buletin Peternakan 46, no. 1 (February 27, 2022): 31. http://dx.doi.org/10.21059/buletinpeternak.v46i1.67523.

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Lactating ewes require high nutrients for basic life requirements and milk production. If not fulfilled, it can have an impact on Negative Energy Balance (NEB) that reduces body weight, Body Condition Score (BCS), and extend the appearance of Postpartum Estrus (PPE). Premating flushing feed is an effort to improve ewe nutrients by adding high nutrition for preparation before mating so that after lambing and suckling, the ewe immediately estrus. This research aimed to evaluate the performance of ewes through premating flushing feeding. The research was conducted at Mendo Galak Farm, Sleman, Yog

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Blumer, S. E., G. E. Gardner, M. B. Ferguson, and A. N. Thompson. "Whole-body fatness is a good predictor of phenotypic feed and liveweight efficiency in adult Merino ewes fed a poor-quality diet." Animal Production Science 56, no. 4 (2016): 789. http://dx.doi.org/10.1071/an15217.

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Weight loss due to poor nutrition in adult ewes over summer–autumn is economically expensive due to immediate costs such as feed and labour but also due to ongoing costs to reproductive success and ewe health. We predicted that adult Merino ewes with a higher proportion of fat would be more efficient, both through lower intake and reduced weight loss. Four-year-old Merino ewes (n = 64) were held in single pens and fed a chaff-based diet either ad libitum, with the aim of achieving liveweight maintenance, or a restricted amount to achieve liveweight loss of 100 g/day. Liveweight change and feed

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Cunningham, Kirsty, Andrew Van Burgel, Khama R. Kelman, Claire M. Macleay, Beth L. Paganoni, and Andrew N. Thompson. "Interactions between Ewes and Rams during Mating Can Be Used to Predict Lambing Dates Accurately, but Not Sire." Animals 12, no. 13 (July 1, 2022): 1707. http://dx.doi.org/10.3390/ani12131707.

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Ewes often lamb over extended periods so the level of nutrition during pregnancy and lambing may be suboptimal for ewes that conceived later during mating. Predicting lambing dates would allow cohorts of ewes with similar gestational ages to be managed more precisely to achieve targets for ewe nutrition, feed on offer, mob sizes and access to shelter to improve lamb survival. The interactions between ewes and rams during mating have been used to predict the time of oestrus and lambing dates successfully, but this has not been tested at a commercial scale. In this study, proximity sensors were

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Edwards, L. J., J. R. McFarlane, K. G. Kauter, and I. C. McMillen. "Impact of periconceptional nutrition on maternal and fetal leptin and fetal adiposity in singleton and twin pregnancies." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 288, no. 1 (January 2005): R39—R45. http://dx.doi.org/10.1152/ajpregu.00127.2004.

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It has been proposed that maternal nutrient restriction may alter the functional development of the adipocyte and the synthesis and secretion of the adipocyte-derived hormone, leptin, before birth. We have investigated the effects of restricted periconceptional undernutrition and/or restricted gestational nutrition on fetal plasma leptin concentrations and fetal adiposity in late gestation. There was no effect of either restricted periconceptional or gestational nutrition on maternal or fetal plasma leptin concentrations in singleton or twin pregnancies during late gestation. In ewes carrying

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Wallace, JM, RP Aitken, and MA Cheyne. "Effect of post-ovulation nutritional status in ewes on early conceptus survival and growth in vivo and luteotrophic protein secretion in vitro." Reproduction, Fertility and Development 6, no. 2 (1994): 253. http://dx.doi.org/10.1071/rd9940253.

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Overfeeding during early pregnancy in ewes compromises pregnancy establishment and/or embryo survival. To determine whether high feed intakes after ovulation alter the secretory dialogue between the conceptus and the endometrium, 24 embryos (8-16-cell) from ewes fed maintenance rations were synchronously transferred in singleton on Day 3 of the cycle (oestrus, Day 0) into the uterus of ewes receiving a high or low plane of nutrition from Day 0 (n = 12 ewes per group). Embryo survival and conceptus growth were assessed on Day 16. At this time, pregnancy was maintained in 11 of 12 recipient ewes

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Kidane, Alemayehu, Jos Houdijk, Spiridoula Athanasiadou, Bert Tolkamp, and Ilias Kyriazakis. "Nutritional sensitivity of periparturient resistance to nematode parasites in two breeds of sheep with different nutrient demands." British Journal of Nutrition 104, no. 10 (August 9, 2010): 1477–86. http://dx.doi.org/10.1017/s0007114510002503.

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The periparturient relaxation of immunity (PPRI) to parasites in mammals is sensitive to both metabolisable protein (MP) supply and animal genotype (different reproductive outputs). We tested the hypothesis that the sensitivity of PPRI to MP scarcity would not differ between different levels of reproductive output when nutrient intake is adjusted for associated differences in MP demand; this hypothesis assumes that PPRI has a nutritional basis only. Scottish Blackface (BF) and the more productive Mule (MU) ewes were infected with the abomasal parasite Teladorsagia circumcincta, and from day− 2

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Kelly, RW, I. Macleod, P. Hynd, and J. Greeff. "Nutrition during fetal life alters annual wool production and quality in young Merino sheep." Australian Journal of Experimental Agriculture 36, no. 3 (1996): 259. http://dx.doi.org/10.1071/ea9960259.

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The effect of maintenance v, submaintenance diets of pregnant ewes in 1991 and 1992 on establishment of the wool follicle population in their progeny, and its effect on the progeny's wool production (quantity, quality and variation across the body of the animal) to 1.4 years of age was examined. The experimental protocol used cloned animals created by bisecting embryos at day 6 of pregnancy. Each clone was placed in a ewe, which was subsequently fed from about day 50 to 140 of pregnancy at maintenance or submaintenance. Ewes on maintenance nutrition maintained liveweight throughout pregnancy,

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Clarke, Lynne, Michael J. Bryant, Michael A. Lomax, and Michael E. Symonds. "Maternal manipulation of brown adipose tissue and liver development in the ovine fetus during late gestation." British Journal of Nutrition 77, no. 6 (June 1997): 871–83. http://dx.doi.org/10.1079/bjn19970086.

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AbstractWe examined the effect of maternal chronic cold exposure, induced by winter-shearing ewes 4 weeks before their predicted lambing date, on brown adipose tissue (BAT) and liver development in lambs. Fetuses were sampled from under-fed (60% of energy requirements for maintenance and pregnancy of an unshorn ewe) shorn or unshorn ewes at 126,140 and 145 d of gestation. Lambs were sampled from ewes within 2 h of birth. Throughout gestation fetal body, BAT and liver weights were similar in shorn and unshorn groups. The level of GDP binding to mitochondrial uncoupling protein remained low thro

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Piaggio, L., H. Deschenaux, F. Baldi, S. Fierro, G. Quintans, and G. Banchero. "Plane of nutrition of Corriedale ewe lambs from foetal life to the onset of breeding affects weight at service and reproductive outcome." Animal Production Science 55, no. 8 (2015): 1011. http://dx.doi.org/10.1071/an13260.

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The objective of this study was to identify periods in the life (foetal and postnatal) of Corriedale ewe lambs where different nutrition levels can affect bodyweight at breeding and pregnancy rate in their first year of life. The effect of three different phases of nutrition on the growth and pregnancy rate (n = 133) of Corriedale ewe lambs of 7 months of age were evaluated. Phase 1 included the last phase of gestation of their mothers (30 last days of gestation, Day –30; partum = Day 0) until marking (Day 24). Phase 2 was between marking and weaning (Day 114) and phase 3 between weaning to th

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Abecia, J. A., F. Forcada, and L. Zarazaga. "A note on the effect of level of nutrition after weaning on the resumption of reproductive activity by ewes of two Spanish breeds lambing in spring." Animal Science 56, no. 2 (April 1993): 273–76. http://dx.doi.org/10.1017/s000335610002136x.

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Two experiments were carried out from April to September 1990 at Zaragoza, Spain. Fifty-three Rasa Aragonesa (RA) ewes, weaned in April, were studied in experiment 1, whilst 33 Salz (Sz) ewes, weaned in June, were studied in experiment 2. From weaning onwards, the animals were allocated to two groups receiving two planes of nutrition: high (H) and low (L). Mean time between weaning and the first detected oestrus was 113 (s.e. 2·7) and 52 (s.e. 3·0) days for RA and Sz ewes, without any significant effect of the plane of nutrition. Ewes of the H group showed a constantly higher ovulation rate th

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Ashworth, C. J., C. M. Dwyer, K. McIlvaney, M. Werkman, and J. A. Rooke. "Breed differences in fetal and placental development and feto-maternal amino acid status following nutrient restriction during early and mid pregnancy in Scottish Blackface and Suffolk sheep." Reproduction, Fertility and Development 23, no. 8 (2011): 1024. http://dx.doi.org/10.1071/rd10290.

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This study assessed the effect of feeding 0.75 energy requirements between Days 1 and 90 of pregnancy on placental development and feto-placental amino acid status on Day 125 of pregnancy in Scottish Blackface and Suffolk ewes carrying a single fetus. Such moderate nutrient restriction did not affect placental size, placentome number or the distribution of placentome types. Although fetal weight was unaffected by maternal nutrition, fetuses carried by nutrient restricted mothers had relatively lighter brains and gastrocnemius muscles. Suffolk fetuses were heavier and longer with a greater abdo

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Pocar, P., L. F. Pisani, S. Antonini, V. Tosetti, T. A. L. Brevini, F. Gandolfi, and S. M. Rhind. "278 GENE EXPRESSION PROFILE OF OVINE OOCYTES AND CUMULUS CELLS WITH REFERENCE TO PREMATING NUTRITION." Reproduction, Fertility and Development 19, no. 1 (2007): 254. http://dx.doi.org/10.1071/rdv19n1ab278.

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Previous studies on sheep have demonstrated effects of maternal nutrition on fetal development with effects being observed on reproductive function (Rae et al. 2002 Anim. Reprod. Sci. 72, 63–71), blood pressure (Gopalakrishnan et al. 2004 Am. J. Physiol. Regul. Integr. Comp. Physiol. 287, R12–R20), and behavior (Erhard et al. 2004 Behav. Brain Res. 151, 25–35) in the adult offspring. It is known that gene expression in developing oocytes and very early embryos is influenced by their environment and some of the effects of nutrition on reproductive and other systems are likely to be expressed th

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Waterhouse, A., D. N. Logue, and L. C. Roger. "The effects of increased prolificacy on lamb and ewe mortality in an intensive hill sheep system." BSAP Occasional Publication 15 (1992): 176–78. http://dx.doi.org/10.1017/s0263967x00004237.

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Increased prolificacy is often believed to increase the incidence of both lamb and ewe mortality especially in harsher environments. Fecundin® (Coopers Pittman Moore) is a vaccine which leads to immunization against androstenedione and a resulting increase in prolificacy (Rhind, 1987). The use of this drug gives a method of manipulating prolificacy without confounding any effects with improved nutrition, the most usual means of modifying reproductive success.A programme was commenced in 1985 in which half the ewes in a flock of Scottish Blackface ewes was vaccinated with Fecundin (F), the rema

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Wilkinson, S. C., and D. M. B. Chestnutt. "Effect of level of food intake in mid and late pregnancy on the performance of breeding ewes." Animal Science 47, no. 3 (December 1988): 411–19. http://dx.doi.org/10.1017/s000335610000355x.

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ABSTRACTIn three experiments pregnant ewes (mean weight 72·5 kg) were subjected to different planes of nutrition on grass silage-based diets during mid pregnancy and, in factorial designed trials with ad libitum silage or ad libitum silage + concentrates in late pregnancy. The high plane of mid-pregnancy nutrition resulted in an average gain of 11·5 kg between weeks 7 and 14 of pregnancy while the low plane gave an average loss of 3·5 kg during this period. These differences did not affect lamb birth weight but ewes on the high plane were 7·2 kg heavier after lambing than those on the low plan

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Pillai, S. M., A. K. Jones, M. L. Hoffman, K. K. McFadden, S. A. Reed, S. A. Zinn, and K. E. Govoni. "Fetal and organ development at gestational days 45, 90, 135 and at birth of lambs exposed to under- or over-nutrition during gestation1,2,3." Translational Animal Science 1, no. 1 (January 1, 2017): 16–25. http://dx.doi.org/10.2527/tas2016.0002.

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Abstract To determine the effects of poor maternal nutrition on offspring body and organ growth during gestation, pregnant Western White-faced ewes (n = 82) were randomly assigned into a 3 × 4 factorial treatment structure at d 30.2 ± 0.2 of gestation (n = 5 to 7 ewes per treatment). Ewes were individually fed 100% (control), 60% (restricted) or 140% (over) of NRC requirements for TDN. Ewes were euthanized at d 45, 90 or 135 of gestation or underwent parturition (birth) and tissues were collected from the offspring (n = 10 to 15 offspring per treatment). Offspring from control, restricted and

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Treacher, T. T., F. Bahhady, H. Hreitani, and A. Termanini. "A comparison of the performance of Turkish and Syrian strains of Awassi ewes at two levels of nutrition." Proceedings of the British Society of Animal Production (1972) 1994 (March 1994): 202. http://dx.doi.org/10.1017/s030822960002746x.

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Although milk is an important product of sheep systems using the Awassi breed in the Near East, typically giving 25% of the gross income, there is little information on the yields of Awassi ewes at defined levels of nutrition. The Awassi is the dominant breed of sheep in the Near East. It is the only breed in Jordan, Lebanon and Syria, which have a total sheep population of 16.9 million. In Iraq about 50% of the 7.8 million sheep are Awassis. There are also approximately 1 million Awassi sheep in Turkey, mainly in the south along the border with Syria. Turkish Awassi ewes have been selected fo

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Quirk, MF, and BW Norton. "The relationship between the cobalt nutrition of ewes and the vitamin B12 status of ewes and their lambs." Australian Journal of Agricultural Research 38, no. 6 (1987): 1071. http://dx.doi.org/10.1071/ar9871071.

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An experiment was undertaken at Mt Cotton, south-east Queensland, to investigate the relationship between the cobalt nutrition of ewes and the occurrence of vitamin B12 deficiency in ewes and their lambs. Ewes received either no supplementary cobalt (C), 0.03 mg cobalt day-1 (LC), 0.06 mg cobalt day-1 (HC) or a cobalt bullet and grinder (CB). LC and HC ewes received their supplement as a weekly drench. Supplementation commenced prior to joining, and ewes subsequently grazed pangola grass pastures containing between 0.05 and 0.11 mg kg-1 cobalt.Cobalt supplementation of ewes increased their liv

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Filo, S., A. V. Goodchild, and T. T. Treacher. "Effects of Body Condition and Level of Nutrition Before Mating on Fertility of Awassi Ewes." Proceedings of the British Society of Animal Production (1972) 1994 (March 1994): 222. http://dx.doi.org/10.1017/s0308229600027665.

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Surveys of flocks in the Near East have shown that lambing percentages of Awassi ewes are rarely above 85% and often as low as 65%. This is a major cause of the low output of sheep systems in the region. The low fertility results from a combination of poor nutrition, poor management, disease and possibly the effects of high temperatures at mating, which generally occurs in mid-summer.Studies by Kassem et al (1989) and Thomson and Bahhady (1988) indicated that the reproductive performance of Awassi ewes is affected by body condition at mating. Neither of these studies was specifically designed

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Bass, Casie S., Dale A. Redmer, Samantha L. Kaminski, and Anna T. Grazul-Bilska. "Luteal function during the estrous cycle in arginine-treated ewes fed different planes of nutrition." Reproduction 153, no. 3 (March 2017): 253–65. http://dx.doi.org/10.1530/rep-16-0526.

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Functions of corpus luteum (CL) are influenced by numerous factors including hormones, growth and angiogenic factors, nutritional plane and dietary supplements such as arginine (Arg), a semi-essential amino acid and precursor for proteins, polyamines and nitric oxide (NO). The aim of this study was to determine if Arg supplementation to ewes fed different planes of nutrition influences: (1) progesterone (P4) concentrations in serum and luteal tissue, (2) luteal vascularity, cell proliferation, endothelial NO synthase (eNOS) and receptor (R) soluble guanylate cyclase β protein and mRNA expressi

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