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Journal of Dairy Science Vol. 66 No. 2 246-252
© 1983 by American Dairy Science Association ®
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Factors Associated with Edema of the Mammary Gland in Primigravid Dairy Heifers1

P. V. Malven, R. E. Erb2, M. Frances D'Amico3, T. S. Stewart and B. P. Chew4

Department of Animal Sciences, Purdue University, West Lafayette, IN 47907

ABSTRACT

The severity and anatomical extent of mammary edema (edema) of 73 primigravid Holstein heifers was scored, and certain hormones in peripheral blood plasma were quantified. The objective was to obtain by least-squares analysis of covariance independent estimates of the association of each hormone and other factors with edema scores around first calving. Mammary edema prepartum increased with age of heifer and gestation length, decreased as calf birthweight increased, but was unrelated to seasonal fluctuations in temperature and photo-period. The increase in edema during the last week of pregnancy was accounted for by associations with prepartum concentrations of hormones in plasma. The independent estimates of hormonal relationships to edema score prepartum were positive for plasma estrone and estradiol-17{alpha} and were negative for plasma estradiol-17ß and progesterone. Plasma prolactin was not related to edema score. After parturition, estradiol-17ß was the only independent variable associated (negatively) with edema. The results indicate a complicated interaction among the sex steroids of late pregnancy wherein some steroids may promote edema and other steroids may inhibit edema in heifers.

FOOTNOTES

1 Journal Paper No. 8552, Purdue University Agricultural Experiment Station. A contribution to regional project NC-113.

2 3300 Carpenter Road SE, #85, Olympia, WA 98503.

3 6600 Whispering Hills Drive, Evansville, IN 47712.

4 Department of Animal Science, Washington State University, Pullman, WA 99164.






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Copyright © 1983 by the American Dairy Science Association ®.