Chpt11_ANS3319PregDiagRectalLab10 - ANS 3319C Reproductive...

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ANS 3319C Reproductive Physiology and Endocrinology Pregnancy Diagnosis via Rectal Palpation in Cattle and Horses Objectives 1) To introduce the management practice of rectal palpation for pregnancy diagnosis in cattle and horses and to provide an understanding of why it is used to make management decisions. 2) To provide “hands-on” experience in rectal palpation for pregnancy determination in cattle. Why is rectal palpation used to determine pregnancy status? 1) The primary reasons rectal palpation is used to determine pregnancy status is because it is an inexpensive and highly accurate method of detecting pregnancy at most stages of gestation. 2) The convenience of using ultrasound to detect pregnancy tends to decrease as cattle and horses enter their second trimester of pregnancy. As a result, it is easier and more practical to determine pregnancy using rectal palpation. 3) Pregnancy status can be detected accurately with a lab test in a most large and small animal species. However, this process is expensive and time consuming. Therefore, it is more practical and takes less time to determine pregnancy status by rectal palpation. Why do we want to determine pregnancy status in cattle? 1) Allows for identification of pregnant females to retain in the breeding herd. In order for a cow to be a productive member of the cowherd, she must have a calf about every 365 days. 2) Allows for identification of cows to be culled from the breeding herd including non-pregnant (aka “open”) cows or cows that became pregnant very late in the breeding season. Open cows are unproductive since they will not provide a calf during the next calving period and become an economic liability to maintain until the next breeding season. Cows that become pregnant very late in the breeding season are less productive and have a difficulty having a calf every 365 days. Culling practices such as these are common for beef, dairy, sheep, and swine producers but would not be a common practice in companion animals and horses. 3) Allows producers to better assess of the reproductive performance of their operation. This would include when cows became pregnant during the breeding season, whether there are herd health problems based on the stages of pregnancy and (or) increased number of open animals, or there are sub-fertile bulls resulting in a high percentage of open cows after the end of the breeding season. Why do we want to determine pregnancy status in horses? 1) Allows for identification of pregnant or non-pregnant (open) mares early in breeding season. 2) Knowledge of pregnancy status allows the brood mare manager to cease teasing of mares for breeding purposes, which allows for more efficient use of labor and resources during the breeding season. 3)
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This note was uploaded on 07/16/2011 for the course ANS 3319 C taught by Professor Yelich during the Spring '11 term at University of Florida.

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Chpt11_ANS3319PregDiagRectalLab10 - ANS 3319C Reproductive...

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