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Milk EPD - How do they work?

机译：牛奶EPD-它们如何运作？

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摘要

Selection of the best bulls for your production and marketing environment, and the subsequent use of those bulls will drive genetic improvement of your herd. The influence of a particular sire increases as the number of cows that bull is expected to service and the resulting number of offspring increases. The greater the number of offspring produced by a particular sire the greater his impact on the herd's genetic makeup. Depending upon the nature of terrain and the acres in breeding pastures, bullsmay be required to service anywhere from 10 to over 100 cows in a breeding season. Using a bull through AI has the potential to increase the number of offspring of a particular sire even further. Make no mistake about it, given the number of offspring sires can produce in comparison to the number of offspring females produce, bulls drive genetic improvement. The bull's impact is typically felt long term through the female progeny retained as replacements in theherd. The females can succeed or fail as producing cows in the herd. Often their success depends upon whether those daughters have the correct genetic potential for milk production— too much milk and the daughters may quickly drop out of the herd because their nutrient requirements exceed those available, too little milk and their calves may be lighter than desired at weaning. When choosing a sire this potential for milk production is represented through the milk EPD; however, milk EPD is likely the most misunderstood of the EPDs.
机译：为您的生产和销售环境选择最佳的公牛，以及随后使用这些公牛将推动您的牛群的遗传改良。特定公牛的影响随着公牛预计要服务的母牛数量的增加以及后代数量的增加而增加。特定父亲产生的后代数量越多，他对牛群遗传构成的影响就越大。根据地形的性质和繁殖牧场的英亩，在繁殖季节可能需要公牛为10至100多头母牛提供服务。通过人工智能使用公牛有可能进一步增加特定公牛的后代数量。毫无疑问，鉴于可以产生的后代父亲数量与雌性的后代数量相比，公牛推动了遗传改良。公牛的影响通常通过保留在后代中的雌性后代而长期感受到。雌性在牛群中生产母牛会成功或失败。他们的成功通常取决于这些女儿是否具有正确的产奶遗传潜能-过多的牛奶，并且由于营养需求超过可用的女儿，这些女儿可能很快从牛群中退出，太少的牛奶和他们的犊牛可能比期望的体重更轻断奶。当选择一个父本时，这种牛奶生产的潜力通过牛奶EPD得以体现。但是，牛奶EPD可能是最容易被误解的EPD。

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