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United States Department of Agriculture

Agricultural Research Service

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Image Number K10360-1

Reproductive physiologist Tom Geary prepares to take a blood sample from a cow to measure her hormones. An ultrasound monitor on the right indicates this cow is 45 days pregnant.

Photo by Peggy Greb.

640 pixels wide: (k10360-1.jpg)

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Last Modified: 10/13/2016
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