A genetic analysis of feed conversion efficiency and associated traits in swine.
A genetic analysis of feed conversion efficiency and associated traits in swine.
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猪饲料转化效率和相关性状的遗传分析。
DOI：
10.2527/jas1986.624910x
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发表时间：
1986
影响因子：
3.3
通讯作者：
B. Bereskin
中科院分区：
文献类型：
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作者：
B. Bereskin
对1,869头纯种杜洛克母猪和约克夏母猪的生产性能记录进行了分析，这些母猪是在703个猪圈中测试的，每组2到4头猪。所研究的性状包括：从56日龄到90.7公斤(ADG)的标准试验期内的平均日增重，试验期内的平均日耗料量(ADF)，从90.7公斤的超声波偏振片照片测量的平均背脂厚(ABF)，以及整个试验期的饲料转化效率(FCE)。主要目的是：1)估计相关的遗传和表型参数；2)讨论研究结果在美国养猪业中的应用。在整个试验期内，随机提供16%的颗粒形式的平衡粗蛋白日粮。用个人和笔式平均值记录计算嵌套式方差分析。根据近交水平调整的方差和协方差的父本分量被用来估计遗传力以及遗传和表型方差、协方差和相关性。从个体记录估计的遗传力，日增重为0.098，ABF为.423。来自PEN均值的估计ADF为.105，FCE为.061。FCE与日增重、日增重和ABF的遗传相关分别为-.520、-.520和.694，而相同性状的表型相关分别为-.240、.570和.212，均由PEN平均值计算。个体记录的日增重与ABF的遗传相关系数为0.176，表型相关系数为0.254。讨论了对猪测试计划的影响，包括一项建议，根据FCE与ADG和ABF的遗传协方差，将FCE间接包括在与ADG和ABF一起的指数中，从而消除了直接测量FCE的需要。
Performance records were analyzed for 1,869 purebred Duroc and Yorkshire gilts tested in littermate groups of two to four pigs in 703 pens. Traits studied were average daily gain during a standard test period from 56 d of age to 90.7 kg (ADG), average daily feed consumption during the test period (ADF), average backfat thickness (ABF) measured from polaroid photos of ultrasonic scans at 90.7 kg and efficiency of feed conversion for the whole test period (feed conversion efficiency, FCE). The main objectives were: 1) to estimate pertinent genetic and phenotypic parameters and 2) to discuss applications of the findings to the swine industry in the United States. A balanced 16% crude protein diet in pelleted form was provided ad libitum during the entire test period. Nested analyses of variance were computed with both the individual and pen mean records. Sire components of variance and covariance, adjusted for level of inbreeding, were used to estimate heritabilities and genetic and phenotypic variances, covariances and correlations. Heritabilities estimated from individual records were .098 for ADG and .423 for ABF. Estimates from pen means were .105 for ADF and .061 for FCE. Genetic correlations of FCE with ADG, ADF and ABF were estimated as -.520, -.520 and .694, respectively, while phenotypic correlations for the same traits were -.240, .570 and .212, respectively, all from pen means. Genetic and phenotypic correlations of ADG with ABF from individual records were .176 and .254, respectively. Implications for swine testing programs were discussed, including a proposal that would include FCE indirectly in an index with ADG and ABF, based on genetic covariances of FCE with ADG and ABF, thereby removing the need to measure FCE directly.