Genetic parameters for carcass traits of field progeny and their relationships with feed efficiency traits of their sire population for Japanese Black cattle
Genetic parameters for carcass traits of field progeny and their relationships with feed efficiency traits of their sire population for Japanese Black cattle
复制标题
DOI：
10.1016/j.livprodsci.2005.09.006
复制
发表时间：
2006-04-01
影响因子：
1.8
通讯作者：
Oikawa, T
中科院分区：
文献类型：
--
作者：
Hoque, MA;Arthur, PF;Oikawa, T
利用REML估计了1774个大田子代（1281头阉牛和493头小母牛）胴体性状的遗传参数及其与父系群体（740头公牛）饲料效率性状的遗传关系。饲料效率性状包括饲料系数（FCR）和剩余采食量（RFI）。通过采食量对代谢体重和日增重的多因素分析，采用表型残差（RFIphc）和遗传残差（RFIgen）回归计算RFI。子代性状为胴体重（CWT）、肋眼面积（REA）、肋厚（RBT）、皮下脂肪、产量估计值（YEM）、大理石纹评分（MSR）、肉质等级、肉色、脂肪色、肉质硬度和肉质质地。CWT的估计遗传力为0.70，其余性状的估计遗传力均为中等（0.32 ~ 0.47），但肉色、肥色和肉质的遗传力较低（0.02 ~ 0.25）。YEM与MSR的遗传相关系数较高（0.62），表明高胴体产量和牛肉大理石花纹的同时提高是可能的。估计母猪的RFI （RFIphc和RFIgen）与其后代的CWT（-0.60和-0.53）和MSR（-0.62和-0.50）的遗传相关性为负，表明母猪对RFI的选择可能有助于生产更重的胴体和牛肉大理石花纹的增加。子代CWT、REA和RBT对RFI选择的相关响应高于对后代FCR选择的相关响应。本研究表明，在父系群体中，为了获得更好的后代胴体性状相关响应，相对于FCR， RFl是首选选择。(c) 2005 Elsevier B.V.版权所有
Genetic parameters for carcass traits of 1774 field progeny (1281 steers and 493 heifers), and their genetic relationships with feed efficiency traits of their sire population (740 bulls) were estimated with REML. Feed efficiency traits included feed conversion ratio (FCR) and residual feed intake (RFI). RFI was calculated by the residual of phenotypic (RFIphc) and genetic (RFIgen) regression from the multivariate analysis of feed intake on metabolic weight and daily gain. Progeny traits were carcass weight (CWT), rib eye area (REA), rib thickness (RBT), subcutaneous fat, yield estimate (YEM), marbling score (MSR), meat quality grade, meat color, fat color, meat firmness and meat texture. The estimated heritability for CWT (0.70) was high and heritabilities for all the other traits were moderate (ranged from 0.32 to 0.47), except for meat and fat color and meat texture which were low (ranged from 0.02 to 0.25). The high genetic correlation (0.62) between YEM and MSR suggests that simultaneous improvement of high carcass yield and beef marbling is possible. Estimated genetic correlations of RFI (RFIphc and RFIgen) of sires with CWT (-0.60 and -0.53) and MSR (-0.62 and -0.50) of their progeny were favorably negative indicating that the selection against RFI of sires may have contributed to produce heavier carcass and increase in beef marbling. The correlated responses in CWT, REA and RBT of progeny were higher to selection against RFI than those to selection against FCR of sires. This study provides evidence that selection against RFl is preferred over selection against FCR in sire population for getting better correlated responses in carcass traits of their progeny. (c) 2005 Elsevier B.V. All rights reserved.