Genetic parameters for production traits and measures of residual feed intake in Duroc and Landrace pigs
Genetic parameters for production traits and measures of residual feed intake in Duroc and Landrace pigs
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DOI：
10.1111/j.1740-0929.2008.00562.x
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发表时间：
2008-10-01
影响因子：
2
通讯作者：
Suzuki, Keiichi
中科院分区：
文献类型：
--
作者：
Hoque, Azharul;Suzuki, Keiichi
利用7个世代380头杜洛克公猪和6个世代1026头长白猪（341头公猪和685头母猪）的资料，估计了日增重（DG）、背膘厚（BF）、代谢重（MWT）、日采食量（FI）、饲料转化率（FCR）和剩余采食量（RFI）的遗传参数。RFI的两个测量值估计为实际采食量与模型预测值之间的差异，模型包括初始测试年龄和体重以及DG（RFI 1）;以及初始测试年龄和体重，DG和BF（RFI 2）。两个品种的DG，MWT和FI的遗传力估计值均为中等。BF估计是高的两个品种。饲料效率（FCR和RFI）的措施是中度遗传。当BF不包括在RFI的估计中时，BF与RFI措施的遗传相关性更强（杜洛克和长白猪分别为0.40和0.46（对于RFI 1），而杜洛克和长白猪分别为0.05和0.06（对于RFI 2））。MWT与RFI测量值的遗传相关性均为负且低。DG和RFI的措施之间的遗传和表型相关性接近于零，这表明选择降低RFI可以在不对DG产生不利影响。在降低RFI的选择下，BF也应该降低，MWT应该增加。BF的减少将取决于所使用的RFI的测量。
Data on 380 Duroc boars from seven generations, and 1026 Landrace pigs (341 boars and 685 gilts) from six generations were used to estimate genetic parameters for daily gain (DG), backfat thickness (BF), metabolic weight (MWT), daily feed intake (FI), feed conversion ratio (FCR) and residual feed intake (RFI). Two measures of RFI were estimated as the difference between actual feed intake and that predicted from models that included initial test age and weight and DG (RFI1); and initial test age and weight, DG and BF (RFI2). Heritability estimates for DG, MWT and FI were moderate for both breeds. BF estimates were high for both the breeds. The measures of feed efficiency (FCR and RFI) were moderately heritable. Genetic correlations of BF with measures of RFI were stronger when BF was not included in the estimation of RFI (0.40 and 0.46 for Duroc and Landrace, respectively (for RFI1), compared with 0.05 and 0.06 for Duroc and Landrace, respectively (for RFI2)). Genetic correlations of MWT with measures of RFI were all negative and low. Genetic and phenotypic correlations between DG and measures of RFI were close to zero, which indicated that selection for reduced RFI could be made without adversely affecting DG. BF should also decrease, and MWT should increase under selection for reduced RFI. The reduction in BF would depend on the measure of RFI used.