Brown M A, Brown A H, Jackson W G, Miesner J R
South Central Family Farm Research Center, ARS, USDA, Booneville, AR 72927-9214.
J Anim Sci. 1993 Dec;71(12):3273-9. doi: 10.2527/1993.71123273x.
Data from 431 Angus, Brahman, and reciprocal-cross calves were used to evaluate performance from weaning to yearling in calves managed during the winter on dormant common bermudagrass or endophyte-infected tall fescue (backgrounding environments). Calves on bermudagrass were weaned at heavier weights (P < .01) but gained less postweaning (P < .01). Weights at 365 d, 365-d hip heights, and 365-d weight:height ratios were similar between calves on different backgrounding environments averaged over breed. There was evidence that heterosis for postweaning ADG was larger in calves managed on endophyte-infected tall fescue (P < .05), but heterosis estimates for 205-d weight, 365-d weight, 365-d hip height, and 365-d weight:height were similar between backgrounding environments. Maternal and direct effects did not significantly interact with backgrounding environment, but there was a trend for maternal effects of 205-d weight, 365-d weight, and 365-d weight:height to be larger on the common bermudagrass environment than on the tall fescue environment. There was also a trend for direct breed effects for postweaning ADG and 365-d hip height to be larger on the common bermudagrass environment. These data indicated that genetic effects may vary with production environment and that consideration should be given to environment when developing crossbreeding systems.
来自431头安格斯牛、婆罗门牛及其正反交犊牛的数据，用于评估冬季在休眠的普通百慕大草或内生真菌感染的高羊茅（育肥环境）上饲养的犊牛从断奶到周岁的生长性能。在百慕大草上饲养的犊牛断奶时体重更重（P < 0.01），但断奶后增重较少（P < 0.01）。不同育肥环境下的犊牛，按品种平均计算，365日龄体重、365日龄臀高以及365日龄体重与身高之比相似。有证据表明，在内生真菌感染的高羊茅上饲养的犊牛，断奶后平均日增重的杂种优势更大（P < 0.05），但不同育肥环境下，205日龄体重、365日龄体重、365日龄臀高以及365日龄体重与身高之比的杂种优势估计值相似。母体效应和直接效应与育肥环境之间没有显著的相互作用，但在普通百慕大草环境下，205日龄体重、365日龄体重以及365日龄体重与身高之比的母体效应有高于高羊茅环境的趋势。在普通百慕大草环境下，断奶后平均日增重和365日龄臀高的直接品种效应也有增大的趋势。这些数据表明，遗传效应可能随生产环境而变化，在制定杂交育种体系时应考虑环境因素。
