J. Anim Sci.
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J. Anim Sci. 1964. 23:752-757.
© 1964 American Society of Animal Science
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Ovarian and Luteal Tissue Weights in Relation to Age, Breed, and Live Weight in Non-Pregnant and Pregnant Heifers and Cows with Normal Reproductive Histories1,2,

R. C. Foley, D. L. Black, W. G. Black, R. A. Damon and G. R. Howe

University of Massachusetts, Amherst

Abstract

In 18 prepuberal calves the weight of both ovaries was not significantly correlated with either age or live weight of the calves. On the contrary, the data show that marked variation exists among calves of approximately the same age or weight, indicating that physiological stage of development is more important than chronological age in determining size and weight of ovaries in calves.

Total ovarian weights as well as the weight of ovarian tissue without the corpus luteum were correlated significantly with age and live weight in normal pregnant cows and heifers.

The weight of the corpus luteum of pregnancy was also correlated with age and live weight. However, there was a high degree of variability among the individuals and the various breeds. From these data it would appear that age and live weight are more important than breed in determining ovarian and luteal tissue weights in normal pregnant cattle.

In normal open cows and heifers weight of the corpus luteum during the cycle was not related significantly to either the age or live weight. Although differences in mean weights of corpora lutea at day 6, 12, or 18 were not significant, the stage of cycle effect on the weight of the corpus luteum was highly significant during day 2 through day 19. The corpus luteum increases rapidly in size between day 2 and day 8, tends to remain relatively constant in weight until regression begins about day 18 or 19, then decreases rapidly in size and weight. The pattern for any individual, however, may vary from this description.

Footnotes

1 Supported by the Northeastern Cooperative Regional Project NE-41, Endocrine Factors Affecting Reproduction, and by funds from the Animal Husbandry Research Branch, U.S.D.A., Beltsville, Maryland.

2 Contribution of the University of Massachusetts, College of Agriculture Experiment Station, Amherst, Massachusetts.






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Copyright © 1964 by the American Society of Animal Science.