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Journal of Dairy Science Vol. 85 No. 6 1427-1436
© 2002 by American Dairy Science Association ®
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Effect of Mastectomy on Milk Fever, Energy, and Vitamins A, E, and ß-Carotene Status at Parturition

Jesse P. Goff 1, Kayoko Kimura 1, and Ronald L. Horst 1

1 National Animal Disease Center, USDA-ARS, Ames, IA 50010

The objective of this study was to compare blood profiles of intact and mastectomized periparturient cows to discriminate those metabolic changes associated with the act of parturition from the metabolic changes caused by lactation. Mastectomized and intact cows had similar increases in plasma estrogens and cortisol concentrations around the time of calving. Mastectomy eliminated hypocalcemia and the rise in 9, 13-di-cis retinoic acid observed in intact cows. Mastectomy reduced but did not eliminate decreases in plasma phosphorus, alpha-tocopherol, and ß-carotene associated with parturition in intact cows, suggesting the mammary gland is not the sole factor affecting plasma concentrations of these compounds. Dry matter intake was similar in both groups before calving. The day of calving, dry matter in take was lower in intact cows than in mastectomized cows, but after calving the mastectomized cows exhibited a pronounced decline in feed intake. Plasmanonesterified fatty acid (NEFA) concentrations rose rapidly in intact cows at calving and did not return to baseline level for > 10 d. In contrast, NEFA concentrations in mastectomized cow plasma rose moderately at calving and returned to baseline level 1 to 2 d after calving. This study provides evidence that hypocalcemia in the cow is solely a result of the calcium drain of lactation. The act of parturition affects blood phosphorus,dry matter intake, and NEFA concentration independent of the effect of lactation.

Key Words: mastectomy • hypocalcemia • milk fever • retinoic acid

Submitted on October 12, 2001
Accepted on January 15, 2002




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