BREEDING FOR FEED EFFICIENCY: SWINE AND DAIRY CATTLE
BREEDING FOR FEED EFFICIENCY: SWINE AND DAIRY CATTLE
复制标题
饲料效率育种：猪和奶牛
DOI：
10.4141/cjas84-061
复制
发表时间：
1984
影响因子：
1
通讯作者：
B. Kennedy
中科院分区：
文献类型：
--
作者：
B. Kennedy
奶牛的饲料效率是中等遗传的，理论上选择改良饲料效率是有效的。尽管如此，直接选择饲料效率并没有在奶牛中实施。监测喂养信息的牛奶记录程序的发展使得大规模选择饲料效率或至少精料转化效率成为可能。然而，据估计，对直接选择增加产奶量的相关反应可能导致70-95%的饲料效率潜在改善，这可能是通过直接选择饲料效率实现的。目前增加体型的选择实践可能不利于饲料效率。在猪中也很少进行直接选择以提高饲料效率。饲料效率选择的实验研究不如预期的成功。相关的反应，从选择一个指数，结合增长率和背膘似乎是有效的，我…
Feed efficiency in dairy cattle is moderately heritable and selection for its improvement theoretically would be effective. Despite this, direct selection for feed efficiency is not practiced in dairy cattle. Growth of milk recording programs which monitor feeding information has made selection for feed efficiency, or at least efficiency of concentrate conversion, possible on a large scale. However, it has been estimated that correlated response to direct selection for increased milk yield probably results in 70–95% of the potential improvement in feed efficiency that could be achieved through direct selection for feed efficiency. Current selection practices for increased body size may be detrimental to feed efficiency. In swine also, little direct selection for improved feed efficiency is practiced. Experimental studies for selection for feed efficiency have been less successful than expected. Correlated response from selection for an index that combines growth rate and backfat seems to be as effective i...