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Journal of Dairy Science Vol. 57 No. 9 1055-1060
© 1974 by American Dairy Science Association ®
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Effects of Breed, Pregnancy, and Lactation on Weight of Organs and Tissues in Dairy Cattle

N. E. Smith1 and R. L. Baldwin

Department of Animal Science, University of California, Davis 95616

ABSTRACT

Twenty-five Holsteins (15 lactating, and 10 nonpregnant nonlactating) and 23 Jerseys (7 lactating, 9 nonpregnant nonlactating, and 7 pregnant nonlactating) were slaughtered; carcass, liver, heart, kidneys, mammary gland, skin, lungs, spleen, adrenals, rumen, omasum, abomasum, small and large intestines, and visceral fat were weighed. Log-log regression analysis was used to compare tissue weights for common body weight and to develop equations for predicting tissue weights from body weights. Expressed on common weight: (1) skin (hide) and lungs were 27 and 21% larger for Holstein than Jerseys; (2) heart and mammary gland were 12 and 34% larger in pregnant Jerseys than in nonpregnant Jerseys; and (3) liver, heart, mammary gland, lungs, rumen, abomasum, intestines, spleen, and adrenals were 25, 22, 73, 22, 20, 35, 31, 20, and 19% larger, and carcass and skin were 8 and 5% smaller in Iactating compared to nonlactating cows. Changes in tissue weights may be related to differences in maintenance energy expenditures for lactating versus nonlactating cows.

FOOTNOTES

1 Department of Animal Science, Cornell University, Ithaca, NY 14850.




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