Anderson F, Williams A, Pannier L, Pethick D W, Gardner G E
Australian Cooperative Research Centre for Sheep Industry Innovation, University of New England, Armidale, NSW 2351, Australia; School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6150, Australia.
Australian Cooperative Research Centre for Sheep Industry Innovation, University of New England, Armidale, NSW 2351, Australia; School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA 6150, Australia.
Meat Sci. 2016 Jun;116:243-52. doi: 10.1016/j.meatsci.2016.02.013. Epub 2016 Feb 23.
This study assessed the effect of paternal Australian Sheep Breeding Values for post weaning c-site eye muscle depth (PEMD) and fat depth (PFAT), and post weaning weight (PWWT) on the composition of lamb carcasses. Composition was measured using computed tomography scans of 1665 lambs which were progeny of 85 Maternal, 115 Merino and 155 Terminal sires. Reducing sire PFAT decreased carcass fat weight by 4.8% and increased carcass bone by 1.3% per unit of PFAT (range 5.1 mm). Increasing sire PEMD reduced carcass fat weight by 3.8% in Maternal and 2% in Terminal sired lambs per unit of PEMD (range 4.3 and 7.8 mm), with no impact on bone. Increasing sire PWWT reduced carcass fat weight, but only at some experimental locations. Differences in composition varied between sire types with Maternal sired lambs having the most fat and Merino sired lambs the greatest bone weight. Genetic effects on fatness were greater than the environmental or production factor effects, with the converse true of bone.
本研究评估了父本澳大利亚绵羊育种值对断奶后胴体组成的影响，这些育种值包括断奶后c部位眼肌深度（PEMD）、脂肪深度（PFAT）以及断奶后体重（PWWT）。通过对1665只羔羊进行计算机断层扫描来测量胴体组成，这些羔羊是85只母系、115只美利奴和155只终端父系种公羊的后代。每单位PFAT（范围为5.1毫米），降低父本PFAT可使胴体脂肪重量减少4.8%，胴体骨骼重量增加1.3%。每单位PEMD（母系羔羊范围为4.3毫米，终端父系羔羊范围为7.8毫米），增加父本PEMD可使母系羔羊的胴体脂肪重量减少3.8%，使终端父系羔羊减少2%，且对骨骼无影响。增加父本PWWT可降低胴体脂肪重量，但仅在部分试验地点如此。不同类型父本的胴体组成存在差异，母系父本的羔羊脂肪最多，美利奴父本的羔羊骨骼重量最大。遗传因素对脂肪含量的影响大于环境或生产因素的影响，而对骨骼的影响则相反。
