英语翻译Data for the current study were obtained from a divergent selection experiment in which the selection criterion was the average serum IGF-I concentrations of 3 postweaning blood samples collected from purebred Angus calves.Multiple-trait

英语翻译Data for the current study were obtained from a divergent selection experiment in which the selection criterion was the average serum IGF-I concentrations of 3 postweaning blood samples collected from purebred Angus calves.Multiple-trait
英语翻译
Data for the current study were obtained from a divergent selection experiment in which the selection criterion was the average serum IGF-I concentrations of 3 postweaning blood samples collected from purebred Angus calves.Multiple-trait derivative-free REML procedures were used to obtain genetic parameter estimates for IGF-I concentrations and for BW and BW gains measured from birth to the conclusion of a 140-d postweaning performance test.Included in the analysis were 2,674 animals in the A(-1) matrix,1,761 of which had valid records for IGF-I concentrations.Direct heritability estimates +/- SE for IGF-I concentration at d 28,42,and 56 of the postweaning period and for mean IGF-I concentrations were 0.44 +/- 0.07,0.51 +/- 0.08,0.42 +/- 0.07,and 0.52 +/- 0.08,respectively.Heritability estimates for maternal genetic effects ranged from 0.10 +/- 0.05 to 0.20 +/- 0.06.The proportion of total phenotypic variance due to the maternal permanent environmental effect was essentially zero for all measures of IGF-I concentrations.Genetic correlations of IGF-I concentrations with weaning and post-weaning BW ranged from 0.07 +/- 0.12 to 0.32 +/- 0.11 and generally demonstrated an increasing trend during the postweaning period.Averaged across the various measures of IGF-I,the genetic correlation of IGF-I with preweaning gain was 0.14,whereas the genetic correlation with postweaning gain was 0.29.Genetic correlations between IGF-I and BW gain were positive during all time intervals,except between weaning and the beginning of the postweaning test and from d 84 to 112 of the postweaning period.Environmental and phenotypic correlations of IGF-I with BW and BW gains were generally positive,but small.These results indicate that postweaning serum IGF-I concentration is moderately to highly heritable and has small positive genetic,environmental,and phenotypic correlations with BW other than birth weight and with pre- and postweaning gain.Therefore,if IGF-I proves to be a biological indicator of an economically important trait (e.g.,efficiency of feed use for growth) in beef cattle,it should be possible to rapidly change IGF-I concentrations via selection without significantly altering live weight or rate of gain.

英语翻译Data for the current study were obtained from a divergent selection experiment in which the selection criterion was the average serum IGF-I concentrations of 3 postweaning blood samples collected from purebred Angus calves.Multiple-trait
目前的研究数据,是根据不同的选择实验中,选择的标准是平均血清IGF - I从纯种安格斯犊牛断奶后收集的血液样本浓度3.多性状衍生无REML法程序,用于获得IGF - I的浓度和测量从出生到140三维断奶体重和性能测试结论体重收益遗传参数估计.包括在分析了动物在A 2674（-1）矩阵,其中有1,761对IGF - I的浓度有效的记录.直接遗传估计+ / - 东南的IGF - I的浓度在D 28,42,和56平均断奶期和IGF - I的浓度分别为0.44 + / - 0.07,0.51 + / - 0.08,0.42 + / - 0.07和0.52 + / - 0.08.遗传的母体遗传效应的估计介于0.10 + / - 0.05至0.20 + / - 0.06.总表型变异由于产妇永久环境效应的比例基本上是零的IGF - I浓度的一切措施.中IGF - I浓度与遗传相关断奶和断奶后体重介于0.07 + / - 0.12至0.32 + / - 0.11,一般表现出了在断奶期间增加的趋势.平均在各项措施的IGF - I的的IGF -Ⅰ与preweaning收益为0.14遗传相关,而断奶后的增益与遗传相关为0.29.血清IGF - I和体重获得遗传相关的所有时间间隔期间积极,除断奶之间和断奶后的测试开始,从D 84至断奶期112.表型相关的环境和IGF - I的与体重和体重涨幅普遍良好,但小.这些结果表明,断奶仔猪血清IGF - I浓度为中度至高度遗传具有小的正遗传,环境和表型与体重比出生时体重与其他前和断奶后的增益和相关性.herefore,如果IGF - I的证明是一个重要的经济性状的肉牛（例如,饲料利用效率的增长）的生物指标,铁应该可以迅速改变没有显着改变生活的重量或通过选择的增益率IGF - I的浓度.
同学,好像是这样翻译,你自己看看然后再总结吧!