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衡量奶牛生存率已经加入到遗传评估中
时间:2017-10-16来源:点击:1003分享:
美国奶牛育种协会之前宣布将加入一个新的育种评价工具---奶牛存活率预期传递力—用于2016年8全部乳用品种公牛的遗传评估。这个新的性状用来预估奶牛在牛群中的存活时间。生产寿命可以用来评估奶牛的生存能力,但是无法区分淘汰和死亡。存活率只是通过淘汰来衡量。“当一头奶牛被当奶用或者肉用时,收入将归牧场主所有”,育种协会的技术支持Duane Norman如此说。“与之对比,如果一头奶牛死亡或者实施安乐死,那么这头奶牛将不能产生价值”

The Council on Dairy Cattle Breeding (CDCB) announced today it was adding a new genetic evaluation tool—Predicted Transmitting Ability for Cow LIV (LIV)—for all breeds for the August 2016 sire runs.

美国奶牛育种协会之前宣布将加入一个新的育种评价工具---奶牛存活率预期传递力用于20168全部乳用品种公牛的遗传评估。


The new trait predicts the cow’s ability to remain alive in the herd. Productive Life estimates survivability, but does not differentiate between culling and dying. LIV measures culling only.When a cow is sold for dairy or beef, the sale income is returned to the owner,” says Duane Norman, CDCB technical advisor. “In contrast, if a cow dies or is euthanized, the cow produces no income.”

这个新的性状用来预估奶牛在牛群中的存活时间。生产寿命可以用来评估奶牛的生存能力,但是无法区分淘汰和死亡。存活率只是通过淘汰来衡量。“当一头奶牛被当奶用或者肉用时,收入将归牧场主所有”,育种协会的技术支持Duane Norman如此说。“与之对比,如果一头奶牛死亡或者实施安乐死,那么这头奶牛将不能产生价值”


Populating U.S. dairy herds with cows capable of longer productive life gives producers more opportunity for voluntary culling,” he says.

美国主要牛群的生产寿命均较长,这提高了牧场主的主动淘汰率,”他说。


Deaths claim about 20% of U.S. cows. The lost disposal income of these animals equate to about $800 million annually. So reducing these losses can dramatically increase income opportunities.

The good new is that the LIV trait is also heritable and highly reliable. Even for young, genomic tested bulls, the reliability is 56%.

美国大概每年死亡约20%的牛。就等于失去了这些动物的可支配收入---每年约8亿美元。所以减少这些损失可以大大增加收入的机会。好的消息是奶牛存活率性状也是可遗传的和高度可靠的。即使对于年轻、基因组公牛,其可靠性是56%

 

LIV values will range from -5 to +5, and are placed on a lifetime scale. Since the average LIV is 80%, the LIV ratings will be added or subtracted from this mean. For example, if a bull’s daughters have a LIV of +2.1, his LIV rating is 82.5.

奶牛存活率的值处于-5 5之间, 并且终生在这个范围内波动。奶牛的平均存活率是80%,存活率评级将从平均值中添加或减去。例如,如果一头公牛的女儿存活率+ 2.1,那么她的存活率等级为82.5


Conversely, a bull with daughters with -0.5 LIV will have a rating of 79.5.

This 2.6 percent difference in an average, 200-cow herd, with cull cows valued at $1,200 per head, translates into $6,240 in additional income.

相反,一头公牛存活率-0.5那么她的存活率等级女为79.5

200头牛,这2.6%的平均差异, 淘汰均价值为1200美元,转化为6240美元的额外收入。

 

In the future, LIV will be incorporated into all four lifetime merit indexes. “Having Cow LIV is one more step toward adding value to the genetic information that will improve dairy producers’ profitability,” says Paul VanRaden, who along with Janice Wright, developed the rating at USDA’s Animal Improvement Programs Laboratory. “Producers participating in DHIA can help to improve the reliability of this trait by accurately reporting the reasons why cows leave their herds.”

在未来,存活率将被纳入所有四个终身价值指标。Paul VanRaden说“拥有奶牛存活率是一个更一步增加价值的基因信息,提高牧场主的盈利能力”,他和Janice Wright美国农业部动物改进项目实验室一起研发出评级标准。“生产者参与DHIA可以通过准确牛离群的原因的报告来帮助改善这一性状的可靠性。”


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