File:Cow female black white.jpg

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摘要

描述

English: Holstein-Friesian milk cow

Because much of the cost of a cow is the feed and labor needed to maintain her, fewer but higher yielding cows mean lower priced milk. Dairy herd improvement ultimately benefits consumers.

That's why it's just as important to keep complete and accurate records as it is to keep the cows contented. The National Cooperative Dairy Herd Improvement Program has been tracking Bossy's milk yields since 1905.

Over the years, this program has made enormous contributions to dairy cattle breeding. ARS scientists receive the lactation records of all herds enrolled in the program and use the figures to rank the bulls that sire the nation's dairy cows and to rank the cows themselves.

The results of years and years of scientific dairying? Milk production has been trending upward for more than 25 years in the United States-from about 117,000 million pounds in 1970 to more than 150,000 million pounds in 1994-even though the number of milk cows has been reduced.

Nederlands: Een koe

日期

在2002年9月之前

来源

www.ars.usda.gov: Image Number K5176-3

作者

Keith Weller/USDA

授权
(二次使用本文件)

此图片处于公有领域，因为它所包含的材料最初来源于美国农业部下属研究机构农业研究服务局。

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管理员或受信用户Roy17确认本图片在2019年4月6日可在下列站点找到并符合所选许可证：
www.ars.usda.gov: Image Number K5176-3

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文件历史

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	日期/时间	大小	用户	备注
当前	2023年8月29日 (二) 03:31	2,700 × 1,803（887 KB）	ReichLover1997	Reverted to version as of 21:09, 24 May 2006 (UTC)
	2018年9月1日 (六) 00:42	2,190 × 1,680（725 KB）	Hohum	Cropped, colour adjust
	2006年5月24日 (三) 21:09	2,700 × 1,803（887 KB）	Siebrand	{{Information\| \|Description= {{nl\|Een koe}} {{en\|Because much of the cost of a cow is the feed and labor needed to maintain her, fewer but higher yielding cows mean lower priced milk. Dairy herd improvement ultimately benefits consumers. That's why it's j