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Artykuły w czasopismach na temat „Lamb production”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 20 lutego 2023

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1

Hall, DG, AR Gilmour, and NM Fogarty. "Variation in reproduction and production of Poll Dorset ewes." Australian Journal of Agricultural Research 45, no. 2 (1994): 415. http://dx.doi.org/10.1071/ar9940415.

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Poll Dorset ewes were joined to Booroola Merino (n = 22) or Trangie Fertility Merino (n = 26) rams in single sire joinings during late summer/autumn of 1978, 1979, 1980 and 1981. Rams were changed each year and there were 1678 individual ewe joinings. A maximum of 527 ewes were used in any one year, and they represented 14 studs and varied in age, reproductive history and liveweight. The traits, litter size, maternal lamb survival, lambs weaned per ewe lambing and weight of lamb weaned per ewe lambing (kg at 100 days) were analysed for the effect of year, stud, age, lambs born and ewe liveweig

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2

Pattinson, S., D. A. R. Davies, and A. Winter. "Colostrum and lamb production of prolific ewes." BSAP Occasional Publication 15 (1992): 166–68. http://dx.doi.org/10.1017/s0263967x00004195.

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The prolific ewe can be regarded as a valuable asset only if she produces viable lambs and, at the same time, sufficient colostrum to meet their needs for energy (MJ) and immunoglobulin (Ig) in the first days of life.The energy requirements of the lamb will depend on its weight and the climatic conditions of its surroundings. Mellor and Murray (1986) recommend 180 ml colostrum per kg body weight during the first 18 h of life for lambs born indoors and 210 ml/kg body weight for lambs born in field conditions. The Ig requirement of the lamb will depend on its size and the disease challenge of th

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3

Lambe, N. R., M. J. Young, G. Simm, J. Conington, and S. Brotherstone. "Seasonal tissue changes in Scottish Blackface ewes over multiple production cycles." Proceedings of the British Society of Animal Science 2003 (2003): 4. http://dx.doi.org/10.1017/s1752756200011637.

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A previous study using X-ray computed tomography (CT) of Scottish Blackface hill ewes found that carcass fat, internal fat and muscle are depleted during pregnancy and early lactation and deposited during late lactation and the dry period. Relationships were also found between fat and muscle levels and lamb production traits (Lambe et al., 2002a). Changes in tissue levels over multiple production cycles of the hill ewe, and how these changes relate to lamb production are also of interest. The aims of this study were to model changes in carcass fat, internal fat and muscle through three product

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4

Adeleye, I. O. A. "SEASONAL EFFECTS ON LAMB PRODUCTION UNDER TROPICAL CONDITIONS." Nigerian Journal of Animal Production 11, no. 2 (January 15, 2021): 168–74. http://dx.doi.org/10.51791/njap.v11i2.2548.

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Observations were made over a period of three years on a total of 336 West African Dwarf (WAD) ewes that were mated to four rams in rotation. Out of a total of 753 lambs obtained, 459 (61%) were produced in the wet season as compared to 294 (39%) produced in the dry season. More lambs were produced as a result of multiple birth (twins and triplets) in the wet than in the dry season. Consequently, the average birth weight of the wet season lambs (1.58kg) was lower than the average birth weight (1.66 kg) of the dry season lambs. Despite this initial disadvantage, the wet season lambs had a highe

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5

Freer, M., JR Donnelly, A. Axelsen, H. Dove, and DG Fowler. "Prime lamb production in relation to time of mating." Australian Journal of Experimental Agriculture 34, no. 1 (1994): 1. http://dx.doi.org/10.1071/ea9940001.

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Over 3 years, we examined the possible benefits of moving the joining date from mid March to early February for the productivity of a prime lamb system based on Border Leicester x Merino ewes on the southern tablelands of New South Wales. The proportion of ewes with >1 lamb (fertility) was affected more by year and by age of ewe than by joining date. The mean proportion of fertile ewes with >1 lamb (fecundity) was reduced from 0.28 to 0.15 at the earlier date, while immunisation against androstenedione increased fecundity at both mating times to 0.42 but significantly reduced fertility i

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6

Giro, Tatiana, Andrey Kulikovsky, Svetlana Andreeva, Ivan Gorlov, and Anna Giro. "Production of enriched lamb in biodegradable packaging." Foods and Raw Materials 8, no. 2 (September 30, 2020): 312–20. http://dx.doi.org/10.21603/2308-4057-2020-2-312-320.

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The paper describes an environmentally safe technology for biofortifying lamb with target components in required concentrations packed in biodegradable film. To address the problem of micronutrient deficiency, we developed a biologically safe method of enriching lamb with organic iodine and selenium supplements. Introducing selenium and iodine feed supplements to the animals’ diet increased the average daily growth of their live mass in experimental groups by 3.43, 6.72, and 14.92% in groups I (iodine), II (selenium), and III (iodine and selenium), respectively, compared to the control group (

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7

Hall, DG, LR Piper, AR Egan, and BM Bindon. "Lamb and milk production from Booroola ewes supplemented in late pregnancy." Australian Journal of Experimental Agriculture 32, no. 5 (1992): 587. http://dx.doi.org/10.1071/ea9920587.

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Booroola ewes in moderate body condition on pasture, were either not supplemented, or supplemented prior to parturition with lupin grain for 9 days in a preliminary experiment, or with lupin or oat grain for 17 days in the main experiment. Measurements included lamb birth weight and survival and, in the main experiment only, ewe milk production and lamb immunoglobulin concentrations. With 9 days of lupin grain supplementation, lamb survival to weaning increased by about 12% (P<0.05), size of litter weaned increased from 1.26 to 1.52 (P<0.01) and lamb birth weight increased by about 0.2 k

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8

Haslin, Emmanuelle, Rene A. Corner-Thomas, Paul R. Kenyon, Emma J. Pettigrew, Rebecca E. Hickson, Steve T. Morris, and Hugh T. Blair. "Effect of Breeding Heavier Romney Ewe Lambs at Seven Months of Age on Lamb Production and Efficiency over Their First Three Breeding Seasons." Animals 11, no. 12 (December 7, 2021): 3486. http://dx.doi.org/10.3390/ani11123486.

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This experiment examined the effect of breeding heavier ewe lambs on lamb production and their efficiency over their first three breeding seasons. Two groups of ewe lambs were bred at seven months of age at an average pre-breeding live weight of either 47.9 ± 0.36 kg (heavy; n = 135) or 44.9 ± 0.49 kg (control; n = 135). Ewe live weight, number of lambs born and weaned, and lamb live weight were recorded until 39 months of age, and efficiency was calculated for each ewe. Although the number and lamb weaning weight did not differ between treatments over three years, when data were pooled, heavi

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9

Fogarty, N. M., and J. G. Mulholland. "Growth and carcass characteristics of crossbred lambs in various production systems." Animal Production Science 52, no. 5 (2012): 373. http://dx.doi.org/10.1071/an11336.

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Lamb growth, carcass and pelt measurements are reported from 5775 lambs born to Border Leicester × Merino (BLM) and Hyfer (Dorset × Merino composite) ewes joined to Dorset, Suffolk and Hyfer rams in three lamb-production systems at Cowra and Wagga Wagga over 5 years. The production systems involved lambings at different seasons of the year and increasing levels of intensification from autumn annual joining, spring joining with a backup mating for non-pregnant ewes, to an accelerated 8-monthly lambing system. Lambs from BLM ewes were 0.7 kg heavier at birth and grew 3% faster and reached slaugh

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10

Keogh, T. P., S. R. McGrath, V. H. Oddy, M. Hernandez-Jover, H. Dickson, and M. B. Allworth. "Are there opportunities to improve lamb feedlot production efficiency? A cross-sectional survey." Animal Production Science 62, no. 4 (December 14, 2021): 381–91. http://dx.doi.org/10.1071/an21309.

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Context Feedlotting lambs has the potential to considerably increase the efficiency of lamb production in Australia. Many producers have turned to grain-finishing lambs to capitalise on high lamb prices and, due to the perceived profitability of this practice, further research to improve production has not been prioritised. Lambs are, however, difficult to adapt to a predominantly grain-based diet, often resulting in highly variable feed intake and growth rates. Aims The aim of this survey was to investigate the apparent growth rates and feed conversion ratios of lambs in current feedlotting e

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11

Xiao-Yong, Chen, Tian Shu-Jun, Sang Run-Zi, Sun Shu-Chun, Zhao Zhu-Jun, Li Jun-Jie, and Dun Wei-Tao. "Induction of lamb follicular development and embryo production in vitro." Chinese Journal of Agricultural Biotechnology 5, no. 3 (December 2008): 257–62. http://dx.doi.org/10.1017/s1479236208002428.

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AbstractEffect of lamb age, transport stimulation and repeated hormone superovulation on the number of collected oocytes were determined. Effect of the culture medium containing ethylenediaminetetraacetic acid (EDTA) on the development of embryos produced in vitro from lamb oocytes was also investigated. Results indicated that the mean numbers of collected and available oocytes (oocytes with compacted cumulus cells, evenly granulated ooplasm and morphologically normal) from 6- to 8-week-old lambs were 60.8±13.9 and 58.2±12.3, respectively. These figures were higher than those obtained from 12-

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12

El Fadili, M., C. Michaux, J. Detilleux, and P. L. Leroy. "Comparison of five crossbreeding types involving Timahdit, D’man and improved terminal sire breeds of sheep: ewe reproduction, lamb survival and growth performance." Animal Science 71, no. 3 (December 2000): 435–41. http://dx.doi.org/10.1017/s1357729800055351.

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AbstractA crossbreeding experiment involving Timahdit (T), D'man (D) and improved sire breeds (M) was conducted to compare lamb production in five crossbreeding types: D ✕ D, T ✕ T, D ✕ T (DT), M ✕ T, and M ✕ DT lambs. Reproductive and production traits were analysed in 1187 litters, 1586 lambs born and 1346 lambs weaned, progeny of 605 ewes. Effects of crossbreeding type, year of birth, sex of lamb, age of dam, and type of birth were significant on the majority of traits studied. The D ✕ D and M ✕ DT crossbreeding system showed the highest litter sizes at lambing and at weaning with respectiv

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13

Morgan, J. E., N. M. Fogarty, S. Nielsen, and A. R. Gilmour. "The relationship of lamb growth from birth to weaning and the milk production of their primiparous crossbred dams." Australian Journal of Experimental Agriculture 47, no. 8 (2007): 899. http://dx.doi.org/10.1071/ea06290.

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The growth rate of 667 single cross lambs from birth to 4 weeks (Period 1) and 4 weeks to weaning at 12 weeks (Period 2) was measured, along with the milk production of their 520 primiparous crossbred ewe dams over 3 years. The lambs were the progeny of Poll Dorset rams and first cross ewes lambing for the first time at 12 and 19 months of age. The first cross ewes were the progeny of Merino ewes mated to 30 individual sires from several maternal sire breeds, including Border Leicester, East Friesian, Finnsheep and Coopworth. Milk production of the ewes was measured at ~3, 4 and 12 weeks of la

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14

Raineri, C., T. S. S. Stivari, and A. H. Gameiro. "Lamb Production Costs: Analyses of Composition and Elasticities Analysis of Lamb Production Costs." Asian-Australasian Journal of Animal Sciences 28, no. 8 (February 5, 2015): 1209–15. http://dx.doi.org/10.5713/ajas.14.0585.

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15

Fogarty, N. M., V. M. Ingham, L. McLeod, G. M. Gaunt, and L. J. Cummins. "Genetic resources to increase the profitability of crossbred lamb production." Australian Journal of Experimental Agriculture 46, no. 7 (2006): 799. http://dx.doi.org/10.1071/ea05355.

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The gross margin returns of first cross ewes by different sires have been evaluated on an equivalent carrying capacity basis by taking account of the feed requirements for the ewes and lambs and their varying performance and requirements throughout the annual production cycle. The study involved 2846 crossbred ewe progeny generated by 91 maternal sires from several breeds at 3 sites over 3 years including genetic links. The ewes were joined to terminal sire rams for 3 years and 8878 of their second cross lamb carcasses were included in the evaluation. The annual gross margin (A$GM) for individ

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16

Fogarty, N. M., D. L. Hopkins, and R. van de Ven. "Lamb production from diverse genotypes. 1. Lamb growth and survival and ewe performance." Animal Science 70, no. 1 (February 2000): 135–45. http://dx.doi.org/10.1017/s1357729800051675.

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AbstractGrowth and survival of 3673 female and cryptorchid lambs representing the range of types (second cross, first cross and Merino) produced in the Australian lamb industry are reported. The lambs were sired by a selection of Poll Dorset (D; no. = 7), Texel (T; no. = 10), Border Leicester (BL; no. = 12) and Merino (M; no. = 12) rams and born to Border Leicester × Merino (BLM) and Merino (M) dams, which resulted in six lamb genotypes (D×BLM, T×BLM, D×M, T×M, BL×M and M×M). The second cross lambs (D×BLM, T×BLM) were heavier at birth, weaning and post-weaning and had higher growth rates, than

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17

Fogarty, N. M., and J. G. Mulholland. "Annual lambing performance of crossbred ewes in out-of-season and accelerated lamb production systems." Animal Production Science 53, no. 10 (2013): 1093. http://dx.doi.org/10.1071/an12269.

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The average annual lamb production of 1182 crossbred ewes was evaluated in three lamb production systems over 4 years at two sites (Cowra and Wagga Wagga). The lamb production systems were: accelerated 8-monthly joinings with two flocks joined 4 months apart (Ac8), spring joining with an autumn back-up joining (SpB), and annual autumn joining (AuA). The Ac8 and SpB systems were evaluated at Cowra and the SpB and AuA systems were evaluated at Wagga Wagga. Two genotypes of ewes, Border Leicester × Merino (BLM) and Hyfer (Dorset × Merino composite), were used at both sites, with natural joinings

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18

Lambe, N. R., J. Conington, K. A. McLean, L. Bunger, and G. Simm. "Relationships between mobilisation of body reserves in hill ewes and lamb production to weaning." Proceedings of the British Society of Animal Science 2007 (April 2007): 118. http://dx.doi.org/10.1017/s1752756200020214.

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Previous studies using X-ray computed tomography (CT) of Scottish Blackface hill ewes have shown that carcass fat, internal fat and muscle are depleted during pregnancy and early lactation and deposited during late lactation and the dry period (Lambe et al., 2003a). Muscle weights and proportions throughout the year are positively genetically correlated with total litter weight reared, largely due to increased litter size. Average weights of lambs reared were positively correlated with carcass fat weight or proportion pre-lambing and internal fat weight pre-mating, but negatively correlated wi

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19

Fogarty, NM, LD Brash, and AR Gilmour. "Genetic parameters for reproduction and lamb production and their components and liveweight, fat depth and wool production in Hyfer sheep." Australian Journal of Agricultural Research 45, no. 2 (1994): 443. http://dx.doi.org/10.1071/ar9940443.

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Hyfer is a new composite breed suited to specialized lamb production and developed from Dorset (+), Booroola Merino (+)and Trangie Fertility Merino (+) genotypes. Genetic parameters estimated by restricted maximum likelihood methods are reported for liveweight, wool production and a range of reproduction and lamb production traits. Estimates of heritability were 0 44 � 0.10, 0.222 � 0-08 and 0.28 � 0.08 for liveweight, ultrasonic fat depth (C site) and fat depth adjusted for liveweight respectively, for 1454 rams averaging 14 months of age, which were the progeny of 130 sires. The genetic corr

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20

Busboom, J. R., T. I. Wahl, and G. D. Snowder. "Economics of callipyge lamb production." Journal of Animal Science 77, suppl_2 (1999): 243. http://dx.doi.org/10.2527/1999.77suppl_2243x.

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KERSLAKE, J. I., P. R. KENYON, K. J. STAFFORD, S. T. MORRIS, and P. C. H. MOREL. "Can maternal iodine supplementation improve twin- and triplet-born lamb plasma thyroid hormone concentrations and thermoregulation capabilities in the first 24–36 h of life?" Journal of Agricultural Science 148, no. 4 (May 20, 2010): 453–63. http://dx.doi.org/10.1017/s0021859610000286.

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SUMMARYThe present study investigated the effects of maternal plasma iodine concentration on twin- and triplet-born lamb plasma thyroid hormone concentrations, rectal temperature and maximal heat production. On pregnancy day 68 (P68), 16 twin- and 14 triplet-bearing ewes were randomly chosen from ewes that were injected intramuscularly with 1·5 ml of iodized peanut oil and ewes that were not. Selected ewes were grazed on ad libitum pasture from P68 until parturition. After parturition, lamb blood samples were collected within 5 min of birth and at 3, 12 and 24–36 h after birth. Lamb rectal tem

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22

Gootwine, E., A. Bor, R. Braw-Tal, and A. Zenou. "Reproductive performance and milk production of the improved Awassi breed as compared with its crosses with the Booroola Merino." Animal Science 60, no. 1 (February 1995): 109–15. http://dx.doi.org/10.1017/s1357729800008201.

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AbstractOvulation rate, embryo survival, lamb production, lamb survival and milk production of Awassi and BooroolaAwassi crossbred ewes, kept indoors, were compared. Awassi were non-carriers while Booroola × Awassi (F1) and about half of 3/4 Awassi-1/4 Booroola (BQ) ewes were heterozygous at the FecB gene. Mean ovulation rate increased by 1·5 to 1·6 corpora lutea per ewe ovulating and prolificacy by 0·7 lambs born per ewe lambing in Fj and BC1 (B+) ewes as compared with Awassi. Embryo survival rates in BC1 ewes with two, three and four ovulations were 0·83, 0·68 and 0·71, respectively. Lamb su

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23

Wuliji, Tumen, Amy Bax, Liga Wuri, Luke Wilbers, and Christopher Boeckmann. "167 Evaluation of an out-of-season breeding system for organic lamb production in missouri." Journal of Animal Science 97, Supplement_3 (December 2019): 173–74. http://dx.doi.org/10.1093/jas/skz258.357.

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Abstract Organic production is one of the fastest growing food and agriculture industry. The seasonality of lamb production affects lamb markets and prices, whereas, an out-of-season breeding and organic fall lamb production scheme may enhance product availability and competiveness. Six rams and 100 Katahdin ewes were selected for an out-of-season breeding during April and May of 2017 and 2018, for two production years. Ewes were synchronized for estrus using CIDR® device (EaziBreed™) (12 d) before breeding and fed ‘flushing’ feed for four weeks. Ewes were bred in mixed sire groups for two est

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24

Holst, P. J., D. F. Stanley, G. D. Millar, A. Radburn, D. L. Michalk, P. M. Dowling, R. Van de Ven, et al. "Sustainable grazing systems for the Central Tablelands of New South Wales. 3. Animal production response to pasture type and management." Australian Journal of Experimental Agriculture 46, no. 4 (2006): 471. http://dx.doi.org/10.1071/ea04041.

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The main limitations for prime lamb production in the Central Tablelands of New South Wales are low availability of forage early in the growing season (late autumn–early winter) and low nutritive value in the summer. This paper describes the performance of a first-cross lamb breeding enterprise on 4 pasture types and 2 management systems over 4 years for the Central Tablelands region. The pastures studied comprised a traditional unfertilised naturalised pasture, a similar pasture fertilised with superphosphate, a sod-sown fertilised introduced perennial grass pasture and a sod-sown summer grow

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25

Campbell, Braden J., Jefferson S. McCutcheon, Francis L. Fluharty, and Anthony J. Parker. "PSIII-5 Delaying Weaning Age of Lambs Grazing Chicory (Cichorium Intybus) Increases Body Weight." Journal of Animal Science 99, Supplement_1 (May 1, 2021): 157. http://dx.doi.org/10.1093/jas/skab054.269.

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Abstract Two common challenges in forage-based lamb production systems is the restriction of net energy from grass-based pastures and the production losses associated with parasitic infection. The inclusion of nutrient rich forage in the diet and delaying lamb weaning age has shown to improve lamb growth rates in some systems. The objective of this experiment was to investigate the effects of grazing chicory (Cichorium intybus) and delayed weaning on the growth and health of young pasture-raised lambs. We hypothesized that improving the quality of available forage and delaying weaning would in

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26

Pettigrew, Emma, Rebecca Hickson, Steve Morris, Paul Kenyon, Rene Corner-Thomas, Emmanuelle Haslin, and Hugh Blair. "The Effect of Age of Dam and Birth Rank on the Reproductive Performance of Ewes as One- and Two-Year-Olds." Animals 11, no. 3 (March 10, 2021): 770. http://dx.doi.org/10.3390/ani11030770.

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Currently, 30–43% of New Zealand sheep farmers breed their ewe lambs, but few retain the offspring as replacements for their flock. No difference in lamb production as a yearling among singletons and twins born to ewe lambs and twins born to mature ewes has been reported, provided the ewe lambs had reached the 60–65% of their likely mature weight prior to breeding at seven to eight months of age. The aim of this experiment was to determine the lamb production from singletons and twins born to ewe lambs and twins born to mature ewes during their first two years of lambing. The experiment includ

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Speijers, M. H. M., L. E. R. Dawson, A. F. Carson, D. J. Kilpatrick, and B. W. Moss. "The effect of genotype and diet on lamb meat quality from hill sheep systems." Proceedings of the British Society of Animal Science 2009 (April 2009): 47. http://dx.doi.org/10.1017/s1752756200028866.

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Crossbreeding can be used in the hill sector to improve the efficiency of production. Carsonet al. (2001) showed that ram breed substitution increased lamb output per ewe by 24% with concomitant improvements in carcass quality. However, information is required for a range of crossing sire breeds for the hill sector to enable the most effective crossbreeding programmes to be developed. Therefore, the primary aim of this study was to evaluate the effects of a range of lamb genotypes on lamb meat quality. Furthermore, a range of production systems (long-keep grass-based systems to short-keep conc

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Hass, Christine C. "Bighorn lamb mortality: predation, inbreeding, and population effects." Canadian Journal of Zoology 67, no. 3 (March 1, 1989): 699–705. http://dx.doi.org/10.1139/z89-101.

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Survival of lambs in the population of bighorn sheep (Ovis canadensis) on the National Bison Range, Montana, was less than 25% during 1983 and 1984. Sixty-seven percent of lamb mortality occurred within 3 days of birth; ewe behaviour and recovered remains indicated that coyotes likely accounted for most of the mortality. Herd history, calculated inbreeding coefficients, and the observation of several small, weak lambs implied that inbreeding depression, while probably not a major factor in lamb mortality, may have predisposed some lambs to predation. Lamb production was high (88–96%); in spite

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Fogarty, NM, and DG Hall. "Performance of crossbred progeny of Trangie Fertility Merino and Booroola Merino rams and Poll Dorset ewes. 3. Reproduction, liveweight and wool production of adult ewes." Australian Journal of Experimental Agriculture 35, no. 8 (1995): 1083. http://dx.doi.org/10.1071/ea9951083.

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Reproduction, liveweight and wool production are reported for 4 cohorts of 377 Trangie Fertility x Dorset (TD) and 261 Booroola x Dorset (BD) ewes over 6 years. The BD ewes were 3-4 kg lighter (P<0.001) and had a higher ovulation rate prior to joining in February-March (2.37 � 0.03 v. 1.65 � 0.03) than TD ewes. This resulted in a higher litter size (2.07 � 0.03 v. 1.66 � 0.04) and number of lambs born per ewe joined (1.92 � 0.04 v. 1.56 � 0.04) for the BD ewes. Lamb survival was lower from BD than TD ewes (0.71 � 0.02 v. 0.85 � 0.02), so that the 2 ewe strains weaned the same number of lamb

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Fleet, M. R., M. J. Bennie, G. N. Dunsford, G. R. Cook, and D. H. Smith. "Lamb production from Merino ewes mated to Merino or Damara rams." Australian Journal of Experimental Agriculture 42, no. 8 (2002): 1027. http://dx.doi.org/10.1071/ea01073.

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Damara sheep have recently been imported to Australia and are being crossed with Merino ewes as a diversification from wool to fat tail sheep production for live sheep export or meat markets. A comparison was made of the lamb outputs from Merino ewes mated to 2 Merino rams and 2 Damara fat tail rams. There were more multiple litters produced in the matings with the Damara rams than from the Merino rams (P = 0.01). The 5-month weights of the crossbred lamb groups (36.3 and 38.9 kg) were higher (P<0.05) than the Merino groups (33.4 and 32.3 kg). Ram lambs were slaughtered at 7 months of age a

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Badgery, W. B., G. D. Millar, D. L. Michalk, P. Cranney, and K. Broadfoot. "The intensity of grazing management influences lamb production from native grassland." Animal Production Science 57, no. 9 (2017): 1837. http://dx.doi.org/10.1071/an15866.

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The intensity of grazing management required for optimal pasture and animal production from heterogeneous native grasslands has received little research in the high-rainfall zone of south-eastern Australia. The aim of this experiment was to determine how the intensity of grazing management, from continuous grazing (P01) to flexible 4- and 20-paddock rotational systems (P04 and P20), influenced the productivity and sustainability of a Merino ewe, terminal sire lamb production system run on a native grassland dominated by Microlaena stipoides and Rytidosperma spp. The present paper focuses on th

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Geenty, K. G., F. D. Brien, G. N. Hinch, R. C. Dobos, G. Refshauge, M. McCaskill, A. J. Ball, et al. "Reproductive performance in the Sheep CRC Information Nucleus using artificial insemination across different sheep-production environments in southern Australia." Animal Production Science 54, no. 6 (2014): 715. http://dx.doi.org/10.1071/an11323.

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The present paper covers reproductive performance in an artificial-insemination (AI) program of the Sheep CRC Information Nucleus with 24 699 lambs born at eight locations in southern Australia across five lambings between 2007 and 2011. Results from AI with frozen semen compared well with industry standards for natural mating. Conception rates averaged 72%, and 1.45 lambs were born per ewe pregnant for Merino ewes and 1.67 for crossbreds. Lamb deaths averaged 21% for Merino ewes and 15% for crossbreds and 19%, 22% and 20% for lambs from ewes that were mated to terminal, Merino and maternal si

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Nenadovic, Katarina, Nikola Cobanovic, Marijana Vucinic, Dejan Bugarski, Tomislav Mikus, Eva Voslarova, Manja Zupan-Semrov, Miroslav Kjosevski, and Nedjeljko Karabasil. "Welfare and meat quality of lambs." Veterinarski glasnik, no. 00 (2021): 6. http://dx.doi.org/10.2298/vetgl210126006n.

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Recently, in many parts of the world, greater importance has been given to lamb meat as well as to the intensive production of lamb and sheep, due to demand for this type of meat at affordable prices. In Serbia, similar to most European countries, the structure of total sheep meat production comprises about 70% lamb meat and 30% sheep meat. This study assessed resource-based measures on 11 dairy sheep farms and investigated, in a total of 30 lambs, the effects of sex, the presence of bruises and pneumonia in carcasses, and carcass and meat quality. Carcass (carcass length, thigh length, croup

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SORMUNEN-CRISTIAN, R., and L. JAUHIAINEN. "Feeding levels during the growing phase affect the production of primiparous Finnish Landrace ewes." Agricultural and Food Science 9, no. 3 (January 3, 2000): 187–200. http://dx.doi.org/10.23986/afsci.5660.

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The effect of different feeding levels on the performance of primiparous ewes was studied in 31 Finnish Landrace ewes bred to lamb at the age of one year. Ewe lambs, initially weighing on average 19.2 kg (SEM 0.63), were placed on a low (L), standard (S) or high (H) level of feeding from 2 months of age to the end of mating and from 2 months pre-partum to the end of 8-week lactation. Changes in live weight were affected by the diet. During rearing, the ewe lambs on L diet gained significantly less (18.0 vs. 24.1 kg/lamb, P

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Maxwell, T. J., Mary D. Lloyd, and I. A. Dickson. "Upland sheep production systems." BSAP Occasional Publication 10 (1985): 95–105. http://dx.doi.org/10.1017/s0263967x00030780.

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AbstractUpland sheep production systems based on the utilisation of enclosed sown pastures are considered in relation to environmental constraints, recent trends in marketing requirements and a continuing need to improve economic efficiency. The need for quantitatively described decision making in relation to both the testing, development and application of new technology is discussed with particular reference to those factors influencing herbage growth, utilisation and management.Relatively few upland farms are capable of producing marketable fat lambs before the decline in returns per kg lam

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36

Malik, RC, MA Razzaque, S. Abbas, T. Al-Mutawa, and N. Al-Khozam. "Breeding Australian crossbred ewes with Arabian fat-tailed rams for intensive lamb production." Australian Journal of Experimental Agriculture 36, no. 1 (1996): 31. http://dx.doi.org/10.1071/ea9960031.

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The reproductive performance under intensive management of Border Leicester x Merino (BLM), Dorset x Merino (DM), and Suffolk x Merino (SM) ewes imported from Australia, and local fat-tailed Naeemi (N) ewes mated to N rams was studied. Progeny performance for birth and weaning weights, average daily gain (ADG) and preweaning survival was also evaluated. BLM ewes showed the highest reproductive performance. They produced and weaned (at 8 weeks) significantly more lambs (P<0.05) than any of the other ewe genotypes. The reproductive performance of the BLM, N, DM and SM ewes, mated twice, 8 mon

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Fogarty, N. M., and J. G. Mulholland. "Seasonal reproductive performance of crossbred ewes in intensive lamb-production systems." Animal Production Science 54, no. 6 (2014): 791. http://dx.doi.org/10.1071/an12434.

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The lambing performance of 1179 crossbred ewes with 5540 joining records in three seasons (autumn, winter and spring) at two sites (Cowra and Wagga Wagga) was evaluated in three lamb-production systems (spring joining with autumn backup matings at both locations, with accelerated lambing at Cowra or annual autumn joining at Wagga Wagga) over 4 years. Two genotypes of ewes, Border Leicester × Merino (BLM) and Hyfer (Dorset × Merino composite), were used at both sites, with natural matings to Dorset, Suffolk or Hyfer rams. The following five traits were analysed separately at each site to evalua

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King, Margaret E., and Beverley J. Keeling. "Lamb Production from Summer Lambing Ewes." Proceedings of the British Society of Animal Production (1972) 1987 (March 1987): 85. http://dx.doi.org/10.1017/s0308229600035200.

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The majority of lamb production in Britain is concentrated in March and April resulting in a glut of lambs during July-September when the guaranteed price is at its lowest. Trials were carried out over 3 years to assess the feasibility of lambing hill and lowground ewes in early summer when grass is at its most productive and little concentrates are necessary prior to lambing.Trial 1 involved 20 bought-in Blackface (BF) ewes which were exposed to the tup in January/February in a sheltered field. Hay was available but no concentrates were fed. Ewes were outwintered and lambed in June/July when

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Minter, C. M., G. Perrott, and E. Legendre. "The effect of feeding varying levels of barley and dried molassed sugar beet feed compared to a commercial creep on the performance of intensively reared Iambs." Proceedings of the British Society of Animal Science 1996 (March 1996): 164. http://dx.doi.org/10.1017/s1752756200593594.

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Feed is the major cost of indoor lamb production, it accounts for up to Â£12/lamb reared (MLC, 1994) which is equivalent to 23% of the output value. Most intensively produced lambs are fed expensive specially formulated lamb creep diets. The aim of this experiment was to evaluate the effect varying the proportions of the starch (barley, WB) and digestible fibre (dried molassed sugar beet feed; SBF) and a protein pellet compared to a commercial lamb creep (LC) on lamb physical and financial performance.180 early weaned lambs, (weaned at 6 weeks of age), weighing on average 17.5 kg liveweight we

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Minter, C. M., G. Perrott, and E. Legendre. "The effect of feeding varying levels of barley and dried molassed sugar beet feed compared to a commercial creep on the performance of intensively reared Iambs." Proceedings of the British Society of Animal Science 1996 (March 1996): 164. http://dx.doi.org/10.1017/s0308229600031305.

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Feed is the major cost of indoor lamb production, it accounts for up to Â£12/lamb reared (MLC, 1994) which is equivalent to 23% of the output value. Most intensively produced lambs are fed expensive specially formulated lamb creep diets. The aim of this experiment was to evaluate the effect varying the proportions of the starch (barley, WB) and digestible fibre (dried molassed sugar beet feed; SBF) and a protein pellet compared to a commercial lamb creep (LC) on lamb physical and financial performance.180 early weaned lambs, (weaned at 6 weeks of age), weighing on average 17.5 kg liveweight we

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THOMAS, V. M., E. AYERS, K. HANFORD, and R. KOTT. "INFLUENCE OF LASALOCID ON THE PRODUCTION OF GESTATING EWES IN AN EXTENSIVE GRAZING SYSTEM." Canadian Journal of Animal Science 68, no. 2 (June 1, 1988): 439–44. http://dx.doi.org/10.4141/cjas88-049.

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A winter feeding trial was conducted to evaluate the influence of lasalocid (L) on the production of gestating ewes in an extensive grazing system. Six hundred and sixty ewes were randomized within age and breed and allotted to feed supplements (0.23 kg head−1 d−1) containing either no L (C) or L at 308 mg kg−1 and fed for 84 d during gestation. Ewe weight change within periods (three, 28-d periods) was similar (P > 0.10) with the exception of period 2 where L-supplemented ewes tended to gain more (P < 0.10) weight than C ewes. Total ewe weight change during the wintering period and year

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Gascoigne, Emily, and Peers Davies. "An approach to neonatal lamb post-mortem examinations." Livestock 24, no. 4 (July 2, 2019): 193–98. http://dx.doi.org/10.12968/live.2019.24.4.193.

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Neonatal lamb mortality is a significant threat to welfare and production in commercial sheep flocks and is defined as the death of lambs during the first week of life with the predominant risk period being the first 48 hours. Lamb mortality between scanning and sale ranges from 10 to 25%, with examples of losses between 0 to 48 hours old ranging from 5.9% to 12.5%. Lamb post-mortem examinations are a tool which can facilitate achieving further understanding of the scale and cause of losses for flocks. We discuss an approach to postmortem examinations on neonatal lambs, the common differential

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Ridler, Anne L., Kate J. Flay, Paul R. Kenyon, Hugh T. Blair, Rene A. Corner-Thomas, and Emma J. Pettigrew. "Factors Associated with Mortality of Lambs Born to Ewe Hoggets." Animals 12, no. 3 (January 28, 2022): 319. http://dx.doi.org/10.3390/ani12030319.

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The reproductive performance of ewe hoggets is poorer than that of mature-age ewes due to production of fewer lambs with poorer survival. Scant data are available on the risk factors for, and causes of, the mortality for lambs born to ewe hoggets, the impact of ewe deaths on lamb loss, and the causes of death for lambs born to ewe hoggets vs. mature-age ewes lambing in the same circumstances. In this study, 297 lambs born to 1142 ewe hoggets were necropsied along with 273 lambs born to 1050 mature-age ewes. Low lamb birthweight, multiple litter size, and increasing ewe hogget average daily gai

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44

Wildeus, Stephan, and Dahlia O’Brien. "142 Reproductive performance of land race hair sheep ewes in different breeding seasons under a semi-continuous production." Journal of Animal Science 98, Supplement_2 (November 1, 2020): 76. http://dx.doi.org/10.1093/jas/skz397.178.

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Abstract A system for semi-continuous lamb production was evaluated using Barbados Blackbelly and St. Croix hair sheep ewes under 8-mo accelerated mating. Ewes were managed in a forage-based production system using rotational grazing. Two flocks of ewes (n = 30–35), equally representing the breeds, were bred 4 mo apart. Ewes were synchronized by feeding melengestrol acetate for 10 d, and mated in two single sire groups to like breed sires in November (NOV), March (MAR), and July (JUL) in a 25-d mating period. Pregnancy was recorded by transrectal ultrasound 22 d after breeding. Ewes were suppl

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45

Annett, R. W., and A. F. Carson. "Effect of digestible undegradable protein (DUP) concentration of concentrates offered to ewes on grass-based diets in late pregnancy on colostrum production and lamb performance." Proceedings of the British Society of Animal Science 2003 (2003): 59. http://dx.doi.org/10.1017/s1752756200012187.

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Nutrition of ewes during late pregnancy is a key factor influencing lamb survival and subsequent lamb growth and performance. Results from on-farm trials indicate that the superior lamb output from highly prolific compared with moderately prolific ewe breed types is less in grass-based compared with indoor lambing systems (Carson and Dawson, 2002). This is as a result of higher mortality rates of triplet lambs in outdoor systems with lower levels of intervention. Feeding and management strategies to maximise lamb viability for multiple births are required for grass-based lambing systems. Prote

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46

Rezende, Vanessa, Gustavo L. Sartorello, Beatriz Q. Reis, Guilherme Boldrin, Laya Alves, Danny Moreno, Miguel Souza, Camila Raineri, and Augusto H. Gameiro. "PSXI-13 Effect of performance indicators, food expenses and interest rate on lamb production cost." Journal of Animal Science 98, Supplement_4 (November 3, 2020): 393. http://dx.doi.org/10.1093/jas/skaa278.691.

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Abstract This study aimed at comparing the influence of zootechnical performance and main cost items over the total production cost of lambs. A representative production system of São José do Rio Preto region, Brazil, designed in a panel meeting, was used as a study basis. We calculated lamb production costs, including variable costs, fixed costs, and income of factors, using the data from December 2019. We then estimated elasticities for the variables: feed expense, interest rate, carcass yield, lamb survival rate, and fertility rate. This way we compared the variation in total cost per year

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Fogarty, NM, DG Hall, and WR Atkinson. "Productivity of three crossbred ewe types mated naturally at 8-monthly intervals over two years." Australian Journal of Agricultural Research 43, no. 8 (1992): 1819. http://dx.doi.org/10.1071/ar9921819.

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Productivity is reported for 175 Booroola MerinoxPoll Dorset (BD), 288 Trangie Fertility MerinoxPoll Dorset (TD) and 248 Border LeicesterxMerino (BLM) ewes joined three times (February, October and June) in 2 years. Overall joining in February resulted in higher performances (153�3% lambs born, 118�3% lambs weaned, 24.7�0.6 kg weight of lamb weaned, per ewe joined) than were obtained following October and June joinings (129�4% born, 93�3% weaned, 15.3�0.5 kg weight weaned per ewe joined). The mean number of lambings per year was 1.28�0.02 with an annual lambing rate of 211�4% lambs born and 16

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Blackburn, H. D., G. D. Snowder, and H. Glimp. "Simulation of lean lamb production systems." Journal of Animal Science 69, no. 1 (1991): 115. http://dx.doi.org/10.2527/1991.691115x.

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Gascoigne, Emily, and Fiona Lovatt. "Lamb growth rates and optimising production." In Practice 37, no. 8 (September 2015): 401–14. http://dx.doi.org/10.1136/inp.h4537.

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Glimp, Hudson A., and Frank H. Baker. "Lamb Production Systems for Increasing Productivity." Professional Animal Scientist 2, no. 2 (December 1986): 24–27. http://dx.doi.org/10.15232/s1080-7446(15)32430-x.

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