Genetic parameters for measures of the efficiency of gain of boars and the genetic relationships with its component traits in Duroc pigs
Genetic parameters for measures of the efficiency of gain of boars and the genetic relationships with its component traits in Duroc pigs
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DOI：
10.2527/jas.2006-730
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发表时间：
2007-08-01
影响因子：
3.3
通讯作者：
Suzuki, K.
中科院分区：
文献类型：
--
作者：
Hoque, M. A.;Kadowaki, H.;Suzuki, K.
对杜洛克猪群7个世代1,642头猪（380头公猪、868头后备母猪和394头公猪）的380头公猪的增重性状效率的遗传参数及其与组成性状的遗传关系进行了估计。增重性状的效率包括饲料转化率（FCR）和剩余采食量（RFI）及其组成性状、日增重（ADG）、代谢体重（MWT）和日采食量（FI）。RFI计算为实际和预期FI之间的差异。通过营养需求以及来自MWT和ADG FI多变量分析的表型（RFIphe）和遗传（RFIGen）回归残差预测预期FI。RFIphe和RFIgen的平均值接近于零，营养RFI的平均值为负值（-0.11 kg/d）。所研究的性状是中度遗传（范围从0.27到0.53）。平均日增重与采食量之间的遗传相关和表型相关均为中等偏高，而平均体重与采食量之间的遗传相关为中等，表型相关为低。RFIphe与RFIgen的相关系数均大于0.95，说明它们可以看作是同一性状。FCR与RFI的遗传和表型相关性较高，但低于统一。RFIphe的表型与其组成性状MWT（r（p）= 0.01）和ADG（r（p）= 0.03）无关。RFIgen与MWT的遗传相关系数r（g）= -0.04，与ADG的遗传相关系数r（g）= 0.15。残留FI的遗传力大于FCR，RFIphe和RFIgen与FI的遗传和表型相关均为正相关，且强于FCR与FI的相关。这些结果表明，RFIphe或RFIgen可用于杜洛克猪的遗传改良。
Genetic parameters for the efficiency of gain traits on 380 boars and the genetic relationships with component traits were estimated in 1,642 pigs (380 boars, 868 gilts, and 394 barrows) in 7 generations of a Duroc population. The efficiency of gain traits included the feed conversion ratio (FCR) and residual feed intake (RFI) and their component traits, ADG, metabolic BW (MWT), and daily feed intake (FI). The RFI was calculated as the difference between the actual and expected FI. The expected FI was predicted by the nutritional requirement and by the residual of phenotypic (RFIphe) and genetic (RFIgen) regressions from the multivariate analysis for FI on MWT and ADG. The means for RFIphe and RFIgen were close to zero, and the mean for nutritional RFI was negative (-0.11 kg/d). The traits studied were moderately heritable (ranging from 0.27 to 0.53). The genetic and phenotypic correlations between ADG and FI were moderate to high, whereas the genetic correlation between MWT and FI was moderate, and the phenotypic correlation between them was low. The corresponding correlations between RFIphe and RFIgen were > 0.95, implying that they can be regarded as the same trait. The genetic and phenotypic correlations of FCR with measures of RFI were high but lower than unity. The RFIphe was phenotypically independent of its component traits, MWT (r(p) = 0.01) and ADG (r(p) = 0.03). The RFIgen was genetically independent of MWT (r(g) = -0.04), whereas there was a weak genetic relationship (r(g) = 0.15) between RFIgen and ADG. Residual FI was more heritable than FCR, and the genetic and phenotypic correlations of RFIphe and RFIgen with FI were positive and stronger than that of FCR with FI. These results provide evidence that RFIphe or RFIgen should be included in breeding programs for Duroc pigs to make genetic improvement in the efficiency of gain.