Australian Cooperative Research Centre for Sheep Industry Innovation, Australia; Murdoch University, School of Veterinary & Biomedical Sciences, Western Australia 6150, Australia.
Australian Cooperative Research Centre for Sheep Industry Innovation, Australia; Murdoch University, School of Veterinary & Biomedical Sciences, Western Australia 6150, Australia.
Meat Sci. 2015 Jan;99:89-98. doi: 10.1016/j.meatsci.2014.07.031. Epub 2014 Aug 7.
Pre-slaughter live weight, dressing percentage, and hot standard carcase weight (HCWT) from the 2007, 2008, 2009 and 2010 birth-years of the Information Nucleus Flock Lambs (n=7325) were analysed using linear mixed effects models. Increasing the sire breeding value for post-weaning weight (PWWT), and c-site eye muscle depth (PEMD), and reducing the sire breeding value for fat depth (PFAT) all had positive impacts on HCWT. The magnitude of the PWWT effect was greater in pure bred Merinos compared to Maternal and Terminal sired progeny. The improved HCWT resulting from increased PEMD was entirely due to its impact on improving dressing percentage, given that it had no impact on pre-slaughter live weight. There were marked differences between sire types and dam breeds, with pure-bred Merinos having lower pre-slaughter weight, reduced dressing percentage, and lower HCWT than progeny from Terminal and Maternal sired lambs or progeny from Maternal (1st cross) dams.
使用线性混合效应模型分析了 2007 年、2008 年、2009 年和 2010 年信息核羊群羔羊（n=7325）的宰前活重、屠宰率和热标准胴体重（HCWT）。增加断奶后体重（PWWT）和 c 位点眼肌深度（PEMD）的 sire 育种值，降低脂肪深度（PFAT）的 sire 育种值，对 HCWT 都有积极影响。与 Maternal 和 Terminal 血统后代相比，纯 Merino 品种的 PWWT 效应更大。增加 PEMD 导致的 HCWT 改善完全是由于其对提高屠宰率的影响，因为它对宰前活重没有影响。 sire 类型和母本品种之间存在显著差异，与来自 Terminal 和 Maternal 血统的羔羊或来自 Maternal（1 代杂交）母羊的后代相比，纯 Merino 品种的宰前体重较低，屠宰率降低，HCWT 也较低。
