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首页> 外文期刊>Journal of Animal Science >Genetic variance and covariance and breed differences for feed intake and average daily gain to improve feed efficiency in growing cattle
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Genetic variance and covariance and breed differences for feed intake and average daily gain to improve feed efficiency in growing cattle

机译：遗传方差和协方差以及饲料摄入量的繁殖差异，平均每日增益提高种植牛的饲料效率

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Feed costs are a major economic expense in finishing and developing cattle; however, collection of feed intake data is costly. Examining relationships among measures of growth and intake, including breed differences, could facilitate selection for efficient cattle. Objectives of this study were to estimate genetic parameters for growth and intake traits and compare indices for feed efficiency to accelerate selection response. On-test ADFI and on-test ADG (TESTADG) and postweaning ADG (PWADG) records for 5,606 finishing steers and growing heifers were collected at the U.S. Meat Animal Research Center in Clay Center, NE. On-test ADFI and ADG data were recorded over testing periods that ranged from 62 to 148 d. Individual quadratic regressions were fitted for BW on time, and TESTADG was predicted from the resulting equations. We included PWADG in the model to improve estimates of growth and intake parameters; PWADG was derived by dividing gain from weaning weight to yearling weight by the number of days between the weights. Genetic parameters were estimated using multiple-trait REML animal models with TESTADG, ADFI, and PWADG for both sexes as dependent variables. Fixed contemporary groups were cohorts of calves simultaneously tested, and covariates included age on test, age of dam, direct and maternal heterosis, and breed composition. Genetic correlations (SE) between steer TESTADG and ADFI, PWADG and ADFI, and TESTADG and PWADG were 0.33 (0.10), 0.59 (0.06), and 0.50 (0.09), respectively, and corresponding estimates for heifers were 0.66 (0.073), 0.77 (0.05), and 0.88 (0.05), respectively. Indices combining EBV for ADFI with EBV for ADG were developed and evaluated. Greater improvement in feed efficiency can be expected using an unrestricted index versus a restricted index. Heterosis significantly affected each trait contributing to greater ADFI and TESTADG. Breed additive effects were estimated for ADFI, TESTADG, and the efficiency indices.
机译：饲料成本是整理和开发牛的主要经济费用;但是，饲料进口数据的集合昂贵。检查生长和摄入量之间的关系，包括繁殖差异，可以促进培养的有效牛。本研究的目的是估算生长和摄入性状的遗传参数，并比较饲料效率的指标，以加速选择响应。在NE的美国肉类研究中心收集了5,606个精加工阉叶和生长小母牛的测试ADFI和On-TestAdg（TestAdg）和切换ADG（PWADG）记录。测试ADFI和ADG数据记录在62至148天的测试期上。按时拟合BW的单个二次回归，并从得到的方程预测TestAdg。我们包括模型中的PWADG，以改善增长和进气参数的估计;通过在重量之间的天数，通过将重量分解到一年重量来源的Pwadg。使用具有TestAdg，ADFI和PWADG的多特征Reml动物模型估计遗传参数，作为依赖变量。固定当代群体是同时测试的小牛的群组，并包括调节的协变量，大坝的年龄，直接和产妇杂种优势以及品种组成。转向Testadg和ADFI，PWADG和ADFI之间的遗传相关（SE）和TestAdg和PWADG分别为0.33（0.10），0.59（0.06）和0.50（0.09），并且对继承者的相应估计值为0.66（0.073），0.77 （0.05）和0.88（0.05）。开发和评估了EBV与ADG的ADFI合并ADG的指数。使用不受限制的指数与限制指数，可以预期进料效率的更高提高。杂种体显着影响每个具有贡献到更大的ADFI和TestAdg的特征。估计ADFI，TestAdg和效率指数估计繁殖添加剂效应。

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