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Artykuły w czasopismach na temat „Wool Growth”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 20 lutego 2023

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1

Lee, GJ, and AJ Williams. "Nutritional responses in wool growth by four Merino genotypes of differing wool growth performance." Australian Journal of Agricultural Research 45, no. 6 (1994): 1171. http://dx.doi.org/10.1071/ar9941171.

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Sheep from four Merino flocks, different in annual clean fleece production when grazed together, were offered a range of nutritional treatments to compare their ability to digest dietary organic matter (experiment 1) and to compare the relationships of wool growth and fibre diameter with nutrient intake (experiment 2). The sheep were selected from a finewool (Fl), a strong wool (S), and two medium-Peppin (MP6 and MP10) flocks. The nutritional treatments varied intakes of two pelleted diets-B and F. Diet B consisted of oat grain, lucerne chaff, and oaten straw, while diet F was as for B but for

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2

Oddy, V. H. "Wool growth of pregnant and lactating Merino ewes." Journal of Agricultural Science 105, no. 3 (December 1985): 613–22. http://dx.doi.org/10.1017/s0021859600059529.

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SUMMARYThe wool production of pregnant, lactating and non-pregnant, non-lactating (dry) Merino ewes eating one of three diets: chaffed oaten hay (OH), chaffed lucerne hay (LH), and a 50/50 (w/w) mixture of OH and LH, was determined. Measurements were made for 2 months prior to mating, during pregnancy and for 3 months after lambing, and for the dry ewes over the same period.Production of clean wool (Y, g/day) by dry ewes was linearly related to digestible organic matter intake (X, g/day):Y = 0·0301 X - 3·34, r = 0·97.Clean wool growth was significantly less (P < 0·01) than dry ewes in the 4

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3

Maddocks, S., Y. Chandrasekhar, and BP Setchell. "Effect on Wool Growth of Thyroxine Replacement in Thyroidectomized Merino Rams." Australian Journal of Biological Sciences 38, no. 4 (1985): 405. http://dx.doi.org/10.1071/bi9850405.

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The effect on wool growth of thyroidectomy with subsequent thyroxine replacement at subnormal and supranormallevels has been investigated in Merino rams fed a restricted basal diet. Thyroidectomy without thyroxine replacement caused a greater than 60% reduction in wool growth. Provision of 30% of normal plasma thyroxine concentrations was sufficient to return wool growth to normal. Similarly, complete replacement of plasma thyroxine levels gave normal wool growth while increasing thyroxine concentrations to three times normal increased wool growth to levels slightly above normal. These results

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4

Haque, Abu Naser Md Ahsanul, and Maryam Naebe. "Waste Wool Powder for Promoting Plant Growth by Moisture Retention." Sustainability 14, no. 19 (September 27, 2022): 12267. http://dx.doi.org/10.3390/su141912267.

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Natural wastes are widely used as composts for plant growth. However, wool waste has received little attention in this regard, despite its nitrogen-rich chemical structure owing to amide groups. A few studies have been conducted for soil amendment using wool, mostly in raw or pellet form. However, despite the possible consistent mixing and more uniform effect of powders inside soil, wool has never been implemented in powder form in soil for improving moisture. This study demonstrates the effectiveness of using wool as a powder, facilitating better mixing and spreading in soil. Results show tha

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5

Sun, Y. X., A. Michel, G. A. Wickham, and S. N. McCutcheon. "Wool follicle development, wool growth and body growth in lambs treated from birth with recombinantly derived bovine somatotropin." Animal Science 55, no. 1 (August 1992): 73–78. http://dx.doi.org/10.1017/s0003356100037296.

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AbstractThe effect of recombinantly derived bovine somatotropin (bST) administration on wool follicle populations, wool growth and body growth was examined in young lambs. Romney × (Border Leicester × Romney) lambs were treated with bST at doses of 0·1 or 0·3 mg/kg live weight per day, or with excipient, commencing on the day of birth and continuing at weekly intervals until the last injection was given at 11 weeks of age. Concentrations of immunoreactive somatotropin in plasma were 19·2 (s.e. 2·1), 65·2 (s.e. 2·8) and 74·7 (s.e. 4·8) μgll in the control, low dose bST and high dose bST groups,

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6

Bond, J. J., P. C. Wynn, G. N. Brown, and G. P. M. Moore. "Growth of wool follicles in culture." In Vitro Cellular & Developmental Biology - Animal 30, no. 2 (February 1994): 90–98. http://dx.doi.org/10.1007/bf02631399.

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7

Wuliji, T., IL Weatherall, RN Andrews, KG Dodds, PR Turner, and R. Wheeler. "Effect of selection for wool growth on seasonal patterns of yield, fibre diameter, and colour in Romney lines." Australian Journal of Experimental Agriculture 35, no. 1 (1995): 27. http://dx.doi.org/10.1071/ea9950027.

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Seasonal wool growth and associated wool characteristics were measured in a Romney line selected for high fleece weight and an unselected control line in 1990 and 1991. Both had a significant (P<0.01) decline in wool growth rate in winter compared with summer. The wool growth rate advantage (P<0.001) of the selected line over the control averaged 19 and 33% for ewes, and 24 and 36% for hoggets, in summer and winter, respectively. Staple strength, yield, and fibre diameter differences were closely associated with wool growth. Colour analysis showed no difference between lines in either br

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8

Radcliffe, BC, PI Hynd, NJ Benevenga, and AR Egan. "Effect of cysteine ethyl ester supplements on wool growth rate." Australian Journal of Agricultural Research 36, no. 5 (1985): 709. http://dx.doi.org/10.1071/ar9850709.

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L-Cysteine ethyl ester hydrochloride (CEE) was evaluated as a dietary sulfur amino acid supplement for increasing wool growth rate. In Experiment 1, eight sheep were offered 800 g chopped lucerne hay daily and wool growth was measured over a three-week control period. These sheep were then given a continuous infusion of either CEE per rumen, CEE per abomasum, cysteine per abomasum or continued on the basal diet alone, for three weeks, and wool growth was measured again. All supplements were equivalent to 25 mmol/day. Wool growth rate on tattooed patches in sheep given CEE per rumen or abomasum

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9

Contrisciano, Thomas M., and E. Jay Holcomb. "GROWTH OF BEDDING PLANTS IN MINERAL WOOL AND MINERAL WOOL/PEAT MIXES." HortScience 27, no. 6 (June 1992): 686b—686. http://dx.doi.org/10.21273/hortsci.27.6.686b.

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The objective of this research was to develop a mineral wool based growing medium for the horticultural industry. Two types of hydrophilic mineral wool, clean wool (CW) and unclean wool (UC) were used unamended, as well as both types in combinations with 25, 50, and 75 percent peat moss (PM). A control of 100 percent (PM) was also used. Unamended CW had a low bulk density, excellent water holding capacity, good aeration, but high pH. Once PM was added to CW, bulk density still remained low, water holding capacity and aeration remained good, and the pH dropped to a more suitable level. Unamende

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10

Davies, S. C., I. H. Williams, C. L. White, and J. E. Hocking Edwards. "Tunicamycin reduces wool growth by slowing the mitotic activity of wool follicles." Australian Journal of Agricultural Research 48, no. 3 (1997): 331. http://dx.doi.org/10.1071/a96055.

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Reductions in wool growth have previously been observed in ewes exposed to low levels of corynetoxins, the causal agents of annual ryegrass toxicity. In this experiment, tunicamycin, a commercially available and closely related toxin, was infused into an isolated area of skin on the abdominal flank. Eleven sheep were continuously infused for 5 days with saline on one side and a total dose of either 35 or 350 µg tunicamycin/kg affected skin on the other side. Both fibre length (P < 0·05) and fibre diameter (P < 0·01) were reduced by tunicamycin treatment. Cell division in the wool follicl

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11

Cronjé, P. B., and M. Smuts. "Nutrient partitioning in Merino rams with different wool growth rates." Animal Science 59, no. 1 (August 1994): 55–60. http://dx.doi.org/10.1017/s0003356100007509.

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AbstractThe aim of this experiment was to determine whether there is any physiological basis for concerns that selection for fleece mass may decrease fitness by increasing the partitioning of nutrients to wool at the expense of other body functions.Forty-five Merino rams (24 months old) were given food at an ad libitum and a maintenance level of nutrition. Animals were grouped into high, average or low clean fleece growth-rate categories on the basis of measurements made during the ad libitum feeding period. During ad libitum feeding, high producers grew proportionately 0·42 more clean fleece,

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12

Lee, GJ, and AJ Williams. "Relationship of feed intake with cystine availability and wool growth in Merino wethers." Australian Journal of Agricultural Research 44, no. 5 (1993): 973. http://dx.doi.org/10.1071/ar9930973.

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Two experiments were conducted to characterize the relationship between nutrient supply and the rate of wool growth. We concentrated on the accepted view that the rate of wool growth in Merino sheep is primarily limited by the availability of sulfur amino acids, which are largely determined by diet intake and its interaction with microbial fermentation in the reticulo-rumen. In the first experiment, the effects of variable intakes of two diets (one including 10% fishmeal) by sheep on the rate of irreversible loss of cystine and plasma cystine concentration were investigated. Nitrogen intake (N

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13

Barnes, A. L., K. P. Croker, J. G. Allen, and N. D. Costa. "Lupinosis and reproduction reduce the wool growth of Merino ewes." Australian Journal of Experimental Agriculture 37, no. 5 (1997): 515. http://dx.doi.org/10.1071/ea97004.

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Summary. Lupinosis was induced in Merino ewes by subcutaneous injections of phomopsins. Liver damage and impairment of liver function was measured by increases in plasma activities of glutamate dehydrogenase and gamma glutamyl transferase, plasma concentrations of bilirubin, and plasma clearance of bromosulfthalein. The wool growth of the ewes during and after exposure to phomopsins at different periods relative to mating was measured, and the impact of lupinosis on annual wool production assessed. Phomopsin administration decreased the length of staple grown during, and for at least 6 weeks a

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14

Hynd, P. I., та R. E. James. "The effect of trenbolone acetate and trenbolone acetate plus oestradiol-17β on wool growth". Journal of Agricultural Science 108, № 2 (квітень 1987): 501–3. http://dx.doi.org/10.1017/s0021859600079557.

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There is currently considerable interest in the use of anabolic compounds to improve the efficiency of animal growth and to produce leaner carcasses. While the majority of work has centred on beef production, the growth performance of sheep is also improved (Galbraith & Topps, 1981). However, little is known of the effects of anabolic steroid hormone administration on wool growth. The few experiments which have been conducted indicate that exogenous oestrogens depress wool output (Slen & Connell, 1958) while exogenous testosterone has consistently enhanced both greasy and clean wool yi

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15

Pritchard, DA, and PK O'Rourke. "Factors differentiating between high and low wool producing sheep in western Queensland." Australian Journal of Agricultural Research 43, no. 6 (1992): 1367. http://dx.doi.org/10.1071/ar9921367.

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Four experiments were carried out to examine factors which may influence the phenotypic expression of wool growth. High wool producing sheep (HPS) and low wool producing sheep (LPS) were selected from a commercial flock and studied under grazing and controlled feeding conditions. Results are discussed in relation to management of HPS for increased wool production. In the paddock experiment, advantages to HPS in wool growth per unit surface area were least (7%) when pasture quality was low (11 g N/kg DM) and greatest (20%) when pasture quality was best (21 g N/kg DM). Despite the greater live w

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16

Stephenson, RGA, GR Suter, and CJ Howitt. "Wool growth responses to DL-methionine administration and factors affecting the value of supplementation." Australian Journal of Experimental Agriculture 31, no. 4 (1991): 471. http://dx.doi.org/10.1071/ea9910471.

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Wool growth responses to methionine administration were assessed using Peppin Merino wethers on various planes of nutrition. In experiment 1, sheep were fed 700 g/day of lucerne pellets to maintain liveweight. DL-methionine (5.8 g) administered subcutaneously resulted in 0.29 mg/cm2.day (36%) more wool (P<0.01) and a 2.5 �m (15.2%) increase in fibre diameter (P<0.05). In experiment 2, two levels (700 and 1400 g/day) of lucerne pellets were offered, with and without methionine administered subcutaneously (5.8 g). Main treatment analysis indicated a significant (P<0.01) effect of nutrit

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17

McCloghry, Elizabeth, Andrew Foldes, David Hollis, Allan Rintoul, Colin Maxwell, Jeff Downing, Peter Baker, John Kennedy, and Peter Wynn. "Effects of pinealectomy on wool growth and wool follicle density in Merino sheep." Journal of Pineal Research 13, no. 3 (October 1992): 139–44. http://dx.doi.org/10.1111/j.1600-079x.1992.tb00068.x.

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18

Antram, RJ, SN McCutcheon, HT Blair, J. Lee, and LA McClelland. "Wool sulfur concentration and output in fleeceweight-selected and control Romney rams." Australian Journal of Agricultural Research 42, no. 2 (1991): 269. http://dx.doi.org/10.1071/ar9910269.

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Wool sulfur concentration and output of Romney sheep from fleeceweight-selected and control lines were measured with a view to determining their potential use as genetic markers for fleeceweight. Midside wool samples were collected at 28 day intervals from 4 to 14 months of age from 35 fleeceweight-selected and 30 control rams. Clean wool growth during each sampling period was calculated. Wool samples were digested using an open wet digestion method and the wool sulfur concentration was determined by plasma emission spectrometry. Fleeceweight-selected rams had significantly greater midside woo

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19

Bray, M., D. K. Revell, C. S. Bawden, and P. I. Hynd. "Keratin gene expression in Merino sheep with divergent wool growth." Australian Journal of Agricultural Research 56, no. 3 (2005): 203. http://dx.doi.org/10.1071/ar03253.

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South Australian Merino sheep were selected on the basis of high or low estimated breeding values (EBV) for wool growth rate (W), but with similar bodyweight, follicle density, and mean fibre diameter. Differences in the level of expression of keratin genes were examined in the skin of these sheep to test the hypothesis that divergence in EBV for wool growth is related to the production of wool proteins differing in sulfur (S) content. Further, it was proposed that this differential gene expression would be most pronounced when the supply of S amino acids to the animal was increased. Sheep sel

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20

De Barbieri, I., R. S. Hegarty, V. H. Oddy, M. C. Barnett, L. Li, and J. V. Nolan. "Sheep of divergent genetic merit for wool growth do not differ in digesta kinetics while on restricted intakes." Animal Production Science 54, no. 9 (2014): 1243. http://dx.doi.org/10.1071/an14319.

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Sheep selected for high wool growth were previously shown to exhibit higher microbial protein outflow from the rumen and higher uptake of amino nitrogen in portal blood than those selected for low wool growth. This suggests that genetic selection for wool growth may induce changes in foregut physiology. This study was undertaken to determine whether differences in digesta kinetics, especially mean retention mime (MRT), are associated with differences in fleece production between sheep with low or high estimated breeding values (EBVs) for fleece weight. Twenty mature Merino wethers with uniform

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21

Zahid, Noosheen, Mehdi Maqbool, Abdul Hamid, Muhammad Shehzad, Majid Mahmood Tahir, Khuram Mubeen, Hafiz Muhammad Rashad Javeed, et al. "Changes in Vegetative and Reproductive Growth and Quality Parameters of Strawberry (Fragaria × ananassa Duch.) cv. Chandler Grown at Different Substrates." Journal of Food Quality 2021 (June 15, 2021): 1–9. http://dx.doi.org/10.1155/2021/9996073.

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Growth substrates (polyester wool, rice husk, and wheat straw), along with soil as control treatment, were compared for vegetative growth, yield, and quality of strawberry cv. Chandler. All growth substrates tested showed good results in terms of growth rate as compared with control. Strawberry plants grown in polyester wool showed the highest (89.50%) survival rate as compared to rice husk (70.50%), wheat straw (64.63%), and control (67.56%). Moreover, a significant increase was observed among number of flowers, fruits, and yield in plants grown in polyester wool. Besides, a significant high

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22

Sherlock, R. G., P. M. Harris, J. Lee, G. A. Wickham, J. L. Woods, and S. N. McCutcheon. "Intake and long-term cysteine supplementation change wool characteristics of Romney sheep." Australian Journal of Agricultural Research 52, no. 1 (2001): 29. http://dx.doi.org/10.1071/ar00031.

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Sulfur amino acid supplementation increases wool production in sheep at low planes of nutrition but it is unclear whether there is any benefit of supplementation at planes of nutrition above maintenance and what implications this might have for wool quality characteristics. This experiment directly investigated the interaction between sulfur supplementation and plane of nutrition in terms of wool growth and fibre characteristics. Twenty-four Romney ewes, acclimatised in individual metabolism units over a 7-week pre-treatment period, were allocated to 1 of 4 treatment groups based on a 22 facto

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23

Wang, H. Y., S. W. Li, T. H. Wu, Z. H. Wu, and J. X. Guo. "The effect of androgen on wool follicles and keratin production in Hetian sheep." Brazilian Journal of Biology 81, no. 3 (September 2021): 526–36. http://dx.doi.org/10.1590/1519-6984.224056.

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Abstract To investigate the optimal androgen concentration for culturing Hetian sheep wool follicle and to detect effects of androgen concentration on wool follicle cell proliferation and apoptosis using immunofluorescence labeling and real-time quantitative fluorescence determinations of wool keratin-associated protein gene expression levels. Wool follicles were isolated by microdissection and wool follicles and skin pieces were cultured in various concentrations of dihydrotestosterone (DHT) in culture medium. Next, daily lengthwise growth measurements of wool follicles were obtained using a

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24

Doyle, PT, RA Love, and TW Plaisted. "Mineral supplementation and wool production of young Merino sheep on the south coast of Western Australia." Australian Journal of Experimental Agriculture 35, no. 4 (1995): 437. http://dx.doi.org/10.1071/ea9950437.

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Wool-free liveweight change (LWC), wool growth rate, annual wool production, and wool characteristics of young Merino wethers fed supplements of lupins with gypsum or a multi-element mineral lick were examined in 12 experiments at 5 farms between 1989 and 1992. The source of sheep varied between experiments; age was 4.5-6.5 months and liveweight 28-37 kg at the beginning of supplementation. Sheep were fed lupins, lupins coated with gypsum (15-20 g/kg lupins), or lupins along with access to the mineral lick (offered at 140 g/sheep.week). The amount of lupins offered in all treatments within any

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25

Reis, P. J., D. A. Tunks, and S. G. Munro. "Effects of the infusion of amino acids into the abomasum of sheep, with emphasis on the relative value of methionine, cysteine and homocysteine for wool growth." Journal of Agricultural Science 114, no. 1 (January 1990): 59–68. http://dx.doi.org/10.1017/s0021859600071008.

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SUMMARYMerino sheep were given abomasal infusions of various amino acids or mixtures of amino acids. Effects on wool growth were measured using autoradiography or a clipping procedure and changes in the concentration of amino acids in plasma were measured in some experiments.Mixtures of five (28 g/day) or ten (45 g/day) essential amino acids (both mixtures containing 3 g methionine) stimulated wool growth of sheep receiving a maintenance ration; on average, the volume of wool grown increased 48% and 86%, respectively. When cysteine completely replaced methionine in these mixtures, wool growth

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26

Greeff, J. C., B. Paganoni, and R. P. Lewer. "Use of part records in Merino breeding programs — the inheritance of wool growth and fibre traits during different times of the year to determine their value in Merino breeding programs." Australian Journal of Experimental Agriculture 45, no. 4 (2005): 347. http://dx.doi.org/10.1071/ea03122.

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Fibre diameter can vary dramatically along a wool staple, especially in the Mediterranean environment of southern Australia with its dry summers and abundance of green feed in spring. Other research results have shown a very low phenotypic correlation between fibre diameter grown between seasons. Many breeders use short staples to measure fibre diameter for breeding purposes and also to promote animals for sale. The effectiveness of this practice is determined by the relative response to selection by measuring fibre traits on a full 12 months wool staple as compared to measuring them only on p

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27

Stephenson, RGA, GR Suter, DA Pritchard, and MDJ Martin. "Studies of wool growth responses to 2-hydroxy-4-(methylthio) butanoic acid, Alimet, an analogue of methionine." Australian Journal of Experimental Agriculture 30, no. 4 (1990): 477. http://dx.doi.org/10.1071/ea9900477.

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An analogue of DL-methionine, Alimet, was evaluated for its commercial potential for increasing wool growth in Merino sheep in pen and grazing experiments. This was done by administering Alimet as a drench, in drinking water, or via rumen or abomasal fistula, and measuring wool growth rate and plasma methionine concentrations. In vivo data indicated that significant wool growth responses (23-35%) to Alimet as a drench or in drinking water occurred at low rates (estimated 5-6 g/sheep.day) of basal wool production when sheep were fed a lucerne diet to maintain liveweight. At higher rates of clea

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28

Masters, DG, CA Stewart, and PJ Connell. "Changes in plasma amino acid patterns and wool growth during late pregnancy and early lactation in the ewe." Australian Journal of Agricultural Research 44, no. 5 (1993): 945. http://dx.doi.org/10.1071/ar9930945.

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Pregnancy and lactation result in depressed growth, fibre diameter and tensile strength of wool. Competition for nutrients between wool follicles, maternal tissues and the foetus may cause these changes. Changes in the concentrations of individual free amino acids in plasma, during late pregnancy, were used as indicators of limiting amino acids in this experiment. A group of pregnant ewes was maintained in the animal house during late pregnancy and early lactation and measurements made on amino acids in plasma. Liveweight, wool growth and quality characteristics and sulfur in wool were also me

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29

Powell, BC, SK Walker, CS Bawden, AV Sivaprasad, and GE Rogers. "Transgenic sheep and wool growth: possibilities and current status." Reproduction, Fertility and Development 6, no. 5 (1994): 615. http://dx.doi.org/10.1071/rd9940615.

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Merino wool is the result of generations of selection, yet improvements in wool quality and performance are still being sought. Through gene manipulation, sheep transgenesis offers possibilities of understanding the relationship between wool keratin protein composition and fibre structure and properties and of introducing novel changes to fibre properties and growth rates. We have established an efficient sheep transgenesis programme with an overall transgenic rate of 2.1% of zygotes injected. However, by incorporating in vitro culture and assessment of injected zygotes, this equates to a tran

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30

Pickering, FS, and PJ Reis. "Effects of abomasal supplements of methionine on wool growth of grazing sheep." Australian Journal of Experimental Agriculture 33, no. 1 (1993): 7. http://dx.doi.org/10.1071/ea9930007.

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Seven experiments are reported in which methionine supplements were given directly into the abomasum of Merino wethers grazing either improved or native pasture at Armidale, New South Wales. In 4 experiments where initial wool growth was 0.4-0.8 mg/cm2.day of clean dry wool, significant increases in wool growth (at 2.4 g methionine/day in 3 experiments and 0.6-4.8 g/day in the fourth) and fibre diameter were obtained when methionine was given once daily in capsules. In the fourth experiment the response to methionine was quadratic, with a maximum at 2.4 g/day. In the remaining 3 experiments, w

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31

Banks, R. G., and D. J. Brown. "Genetic improvement in the Australasian Merino – management of a diverse gene pool for changing markets." Animal Genetic Resources Information 45 (October 2009): 29–36. http://dx.doi.org/10.1017/s1014233909990290.

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SummaryThe Australasian Merino population has declined significantly over the last 15 years in response to a decline in the price of apparel wool, both in absolute terms and relative to the price of sheep meat. Over the same period, a national genetic evaluation system based on BLUP methods has been introduced, that is achieving steady growth in adoption by breeders. Genetic parameter estimates for the population provide evidence for considerable genetic diversity for all recorded traits, providing ample opportunity for genetic improvement. More recently, there is considerable evidence for inc

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32

White, C. L., G. B. Martin, P. I. Hynd, and R. E. Chapman. "The effect of zinc deficiency on wool growth and skin and wool follicle histology of male Merino lambs." British Journal of Nutrition 71, no. 3 (March 1994): 425–35. http://dx.doi.org/10.1079/bjn19940149.

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The aims of this work were to quantify the requirements of Zn for wool growth in growing male Merino lambs, and to describe the histological lesions of Zn deficiency in skin and wool follicles. Four groups of male Merino lambs (n 4) weighing 22 kg were fed ad lib. for 96 d on diets that contained 4 (basal diet), 10, 17 or 27 mg Zn/kg. Sheep in a fifth group were fed on the diet containing 27 mg Zn/kg, but were pair-fed to sheep on the 4 mg Zn/kg diet. Zn was added to the basal diet as ZnSO4 to give the respective treatment concentrations. Sheep fed on the diet containing 4 mg Zn/kg showed clin

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33

Butler, LG, and GM Head. "Photoperiodic rhythm of wool growth and its contribution to seasonal wool production by the Merino, Polwarth, and their reciprocal crosses in southern Australia." Australian Journal of Experimental Agriculture 34, no. 3 (1994): 311. http://dx.doi.org/10.1071/ea9940311.

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Twelve wethers of each of the Merino and Polwarth breeds and their reciprocal crosses were fed at1 of 2 levels in individual pens for 14 months. Periodic clean wool weight, yield, fibre diameter, and the coefficient of variation (CV%) for fibre diameter were measured from midside patches harvested every6 weeks.There was a significant effect of time of wool harvest on clean wool weight per cm2, yield, fibre diameter(all P<0.01), and its CV% (P<0.05). A trough in wool production occurred about August-September and a peak in January. The amplitude of the photoperiodic rhythm of wool growth

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Campbell, N. J., P. D. Hanrahan, I. M. Russell, G. S. Roberts, and B. J. Horton. "Modelling pesticide residues on greasy wool: experimental studies." Australian Journal of Experimental Agriculture 38, no. 5 (1998): 441. http://dx.doi.org/10.1071/ea98047.

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Summary. A model has been fitted to results from experimental application of organophosphates, synthetic pyrethroids and insect growth regulators to sheep mostly in long wool. The model relates the rate of breakdown of pesticide to the chemical used, the method of application and the length of wool at the time of treatment. A genetic algorithm was used to combine a range of experimental results for each chemical group to determine the rate of breakdown, and also the effect of application method and length of wool on breakdown. Organophosphates break down very quickly when applied to the surfac

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Revell, Dean K., Suzanne K. Baker, and D. Barrie Purser. "Nitrogen and sulfur mobilised from body tissue can be used for wool growth." Australian Journal of Agricultural Research 50, no. 1 (1999): 101. http://dx.doi.org/10.1071/a98068.

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The hypothesis was tested that when nitrogen (N) and sulfur (S) are mobilised from body tissue the rate of wool growth is determined both by the amount of N and S apparently digested and by the amount of N and S mobilised from body tissue. The experiment consisted of seven 5-day periods (Periods 1–7) and N and S retention were measured during each period in 12 mature Merino wethers. During Periods 2 and 3, casein and methionine were infused into the abomasum of all sheep to increase the amount of N and S absorbed in the small intestine. Three nutritional regimes were used in order to manipulat

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Contrisciano, Thomas M., and E. Jay Holcomb. "Growth of bedding plants and poinsettias in mineral wool and mineral wool/peat substrates." Communications in Soil Science and Plant Analysis 26, no. 3-4 (February 1995): 485–501. http://dx.doi.org/10.1080/00103629509369313.

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Hynd, PI, and WG Allden. "Rumen fermentation pattern, postruminal protein flow and wool growth rate of sheep on a high-barley diet." Australian Journal of Agricultural Research 36, no. 3 (1985): 451. http://dx.doi.org/10.1071/ar9850451.

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Variations in the wool growth rate of sheep fed diets containing cereal grains were investigated. In experiment 1, eight sheep consuming similar quantities of a pelleted diet of barley grain and lucerne chaff (60:40 by weight) were selected for high (n = 4) or low (n = 4) wool growth rate. These wool growth differences were eliminated by feeding a high-protein, predominantly roughage diet. Subsequent reintroduction of the high-grain diet regenerated wide between-sheep variance, but there was little evidence of repeatability of performance on this ration. These variations in wool growth were ex

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Shi, Ruijun, Shuwei Li, Penggang Liu, Shuhui Zhang, Zhenhui Wu, Tinghui Wu, Shujuan Gong, and Yu Wan. "Identification of key genes and signaling pathways related to Hetian sheep wool density by RNA-seq technology." PLOS ONE 17, no. 5 (May 25, 2022): e0265989. http://dx.doi.org/10.1371/journal.pone.0265989.

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Hetian sheep is a breed of sheep unique to the Hetian area of Xinjiang whose wool is used for producing blankets. Individual differences and hair follicle density are the key factors affecting wool production. Therefore, this study aimed to assess the Hetian sheep having different wool densities to statistically analyze the wool traits and hair follicle parameters. Furthermore, the transcriptome sequencing analysis was performed on the skins with different wool densities. The results showed that wool quantity and total hair follicle density of the high wool density sheep was significantly high

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Wynn, PC, ALC Wallace, AC Kirby, and EF Annison. "Effects of Growth Hormone Administration on Wool Growth in Merino Sheep." Australian Journal of Biological Sciences 41, no. 2 (1988): 177. http://dx.doi.org/10.1071/bi9880177.

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The effects of daily administration of 10 mg of highly purified ovine growth hormone (GH) for a period of 4 weeks on wool growth have been measured in 12 Merino ewes fed either a calculated maintenance energy intake or 1�6 times this amount (six on each ration). Concentrations of hormones, glucose, urea, a-amino N and amino acids in the blood were monitored and faeces and urine collected for measurement of nitrogen balance.

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Fenn, PD, and RA Leng. "Wool growth and sulfur amino acid entry rate in sheep fed roughage based diets supplemented with bentonite and sulfur amino acids." Australian Journal of Agricultural Research 40, no. 4 (1989): 889. http://dx.doi.org/10.1071/ar9890889.

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In two experiments, sheep were offered a roughage-based diet supplemented with either cysteine or bentonite as a solid, or bentonite, cysteine or methionine added to their drinking water. Supplementation with cysteine as a solid had no effect on wool growth, while supplementation via drinking water had no effect on wool growth or cysteine entry rate into the blood. Supplementation with methionine via drinking water increased the entry rate of methionine into blood by 69% (P< 0.05) as measured by a continuous infusion of [35S]-methionine. This coincided with subsequent increases in wool grow

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Reis, PJ, DA Tunks, and SG Munro. "Effects of abomasal protein and energy supply on wool growth in Merino sheep." Australian Journal of Agricultural Research 43, no. 6 (1992): 1353. http://dx.doi.org/10.1071/ar9921353.

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The relative importance for wool growth of energy-yielding nutrients compared with amino acids required for incorporation into wool proteins was assessed in an experiment in which most nutrients were supplied via the abomasum. Nine nutritional treatments, providing three levels of protein (53, 99 and 145 g/day) to the intestines at three levels of energy (5.2, 7.5 and 9.7 MJ/day), were given to 12 Merino sheep during three consecutive periods of 3 weeks in a balanced lattice design. Abomasal nutrients consisted of varying proportions of casein, whole milk, glucose and glycerol. There was a lar

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Terrill, T. H., G. B. Douglas, A. G. Foote, R. W. Purchas, G. F. Wilson, and T. N. Barry. "Effect of condensed tannins upon body growth, wool growth and rumen metabolism in sheep grazing sulla (Hedysarum coronarium) and perennial pasture." Journal of Agricultural Science 119, no. 2 (October 1992): 265–73. http://dx.doi.org/10.1017/s0021859600014192.

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SUMMARYAreas of sulla (Hedysarum coronarium) and pasture (Lolium perenne/Trifolium repens/Holcus lanatus) were grazed by young sheep (29·5–34·8 kg initial liveweight) in four experiments, and effects upon body growth, wool growth and rumen metabolism were measured.Sulla contained 40–50 g condensed tannins (CT)/kg DM, whilst the pasture contained small amounts of CT (2–6 g/kg DM). After chewing during eating, a lower proportion of total CT was readily extractable and greater proportions were protein-bound and fibre-bound. Nutritional effects attributable to CT were assessed by oral administrati

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Masters, D. G., C. A. Stewart, G. Mata, and N. R. Adams. "Responses in wool and live weight when different sources of dietary protein are given to pregnant and lactating ewes." Animal Science 62, no. 3 (June 1996): 497–506. http://dx.doi.org/10.1017/s1357729800015034.

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AbstractWool growth, staple strength and fibre diameter are reduced during pregnancy and lactation. This may be due to the increased requirement for protein for foetal growth, udder development and milk production causing a lack of amino acids for wool. Responses in wool production, ewe live weight, lamb birth weight and growth, plasma amino acids and levels of cortisol, insulin and growth hormone were measured when different sources of protein were offered. Either lupin seed (L), fish meal (F) or formaldehyde-treated egg white (E) were included in an oaten hay-based diet offered during the fi

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Cobon, DH, RGA Stephenson, and PS Hopkins. "The effect of oral administration of methionine, bentonite, methionine/bentonite and methionine/oil homogenates on wool production of grazing and penned sheep in a semi-arid tropical environment." Australian Journal of Experimental Agriculture 32, no. 4 (1992): 435. http://dx.doi.org/10.1071/ea9920435.

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Penned and grazing sheep were supplemented in 3 experiments with either methionine (Me 2.5 g/sheep.day), bentonite (Bent 5 or 10 g), Me + Bent (1 : 2 and 1 : 4) or Me/oil homogenates. These supplements were added to the drinking water or in molasses-based licks for treatment periods of 4-6 weeks duration. The effects of supplements on wool growth, liveweight, and ammonia concentration in rumen liquor were determined. In experiment 1, penned sheep fed a maintenance diet (750 g/sheep.day) of pelleted lucerne and supplemented via the drinking water, showed increased (P<0.05) mean wool growth f

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Thompson, A. N., M. W. Hyder, and P. T. Doyle. "Effects of differential grazing of annual pastures in spring and age of sheep on pasture and sheep production." Australian Journal of Experimental Agriculture 37, no. 7 (1997): 727. http://dx.doi.org/10.1071/ea96036.

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Summary. The effects of controlled grazing through spring on the production of young (age 1 year; liveweight 38.3 ± 0.09 kg; condition score 3.0 ± 0.03) and mature (age 3 years; liveweight 61.9 ± 0.36 kg; condition score 3.1 ± 0.04) Merino wethers was examined. The grazing treatments involved adjusting sheep numbers to maintain green feed on offer near target amounts of 800, 1200, 1600, 2000, 2400 and 2800 kg dry matter/ha. Liveweight and wool growth measurements were made on 8 sheep per plot, with additional animals added or removed as necessary to maintain pasture near the target feed on off

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WARD, MP, and RTF ARMSTRONG. "Residues of insect growth regulators on Queensland wool." Australian Veterinary Journal 76, no. 10 (October 1998): 698–99. http://dx.doi.org/10.1111/j.1751-0813.1998.tb12287.x.

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Safari, E., N. M. Fogarty, A. R. Gilmour, K. D. Atkins, S. I. Mortimer, A. A. Swan, F. D. Brien, J. C. Greeff, and J. H. J. van der Werf. "Across population genetic parameters for wool, growth, and reproduction traits in Australian Merino sheep. 2. Estimates of heritability and variance components." Australian Journal of Agricultural Research 58, no. 2 (2007): 177. http://dx.doi.org/10.1071/ar06162.

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Precise estimates of genetic parameters are required for genetic evaluation systems. This study combined data from 7 research resource flocks across Australia to estimate variance components and genetic parameters for production traits in the Australian Merino sheep. The flocks were maintained for several generations and represented contemporary Australian Merino fine, medium, and broad wool bloodlines over the past 30 years. Over 110 000 records were available for analysis for each of the major wool traits, and 50 000 records for reproduction and growth traits with over 2700 sires and 25 000

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Albers, GAA, GD Gray, Jambre LF Le, LR Piper, IA Barger, and JSF Barker. "The effect of Haemonchus contortus on liveweight gain and wool growth in young merino sheep." Australian Journal of Agricultural Research 40, no. 2 (1989): 419. http://dx.doi.org/10.1071/ar9890419.

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Results of three crossover experiments on a total of 1078 Merino lambs were used to estimate the effect of a single infection of 11 000 Haernonchus contortus larvae on liveweight gain, clean wool growth and wool fineness. Estimates were obtained by direct comparison of six groups of infected and matched uninfected iambs under field conditions. Infections were terminated after 5 weeks, at which stage some mortality had occurred and haematocrits had in five out of six cases declined to less than 24%. Over an 8-9 week period, beginning at the time of infection, liveweight gains of infected lambs

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Morcombe, P. W., M. Gillibrand, B. J. Horton, R. T. F. Armstrong, N. J. Campbell, D. J. Best, W. Barr, and J. Karlsson. "Modelling pesticide residues on greasy wool: surveys of the insect growth regulators triflumuron and diflubenzuron." Australian Journal of Experimental Agriculture 39, no. 5 (1999): 529. http://dx.doi.org/10.1071/ea98174.

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Surveys have examined the relationship between louse and flystrike treatments on farms and the resulting residues of insect growth regulators on greasy wool. These results have been summarised using a model of the on-farm survey data. The model estimated the amount of chemical taken up by the wool at application. This was based on experimental breakdown rates of these insecticides on wool determined in controlled trials. The data indicated that the backliner, triflumuron, when used off-shears within 24 h of shearing, was normally applied at slightly higher than the recommended rate on-farm and

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Masters, D. G., A. D. Peterson, G. Mata, and S. M. Liu. "Influence of liveweight, liveweight change, and diet on wool growth, staple strength, and fibre diameter in young sheep." Australian Journal of Agricultural Research 49, no. 2 (1998): 269. http://dx.doi.org/10.1071/a97093.

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The effects of initial liveweight, liveweight change, and composition of the diet on wool growth and staple strength in weaner sheep were investigated. Weaner wethers (64) were allocated to treatments in a factorial design (23). The factors were initial liveweight (heavy, 33 kg; light, 25 kg), liveweight change (fed at maintenance for 56 days, or 28 days at 0 ·6×maintenance then 28 days at 1·6×maintenance), and diet (lupin seed based diet or canola meal based diet). The heavier weaners grew approximately 1·9 g/day more wool than the light sheep during the experimental period and this resulted

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