J. Anim Sci.
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J. Anim Sci. 1973. 37:1176-1179.
© 1973 American Society of Animal Science
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Ovarian Follicular Estrogens in Angus Heifers1, 2,

B. G. England, H. J. Karavolas3, E. R. Hauser and L. E. Casida

University of Wisconsin, Madison 53706

Abstract

Estrone (E1), estradiol-17ß(E2ß), estradiol-17{alpha} (E2a) and estriol (E3) were measured (using gas liquid chromatography) in the largest follicle taken from each ovary of Angus heifers at estrus and on day 14 following estrus.

More total estrogen (E1 + E2ß) was found in the largest follicle in the ovary without a corpus luteum as compared to the ovary with the recently functional corpus luteum at estrus (9.2 µg vs. 4.3 µg; P < .05). This difference was reversed on day 14 (3.0 µg vs. 6.1 µg; P < .05). There was no significant correlation between the content of estrone and estradiol-17ß in the largest follicle nor was there an effect of follicular size, within day, upon estrogen content. Estradiol-17{alpha} was detected in seven of the 18 follicles studied but no association was found between the presence of estradiol-17{alpha} and the follicular content of estradiol-17ß or estrone.

The mean weight of the follicles from heifers in estrus was significantly greater than of follicles from heifers on day 14 (mean = 783 mg vs. 411 mg; P < .01).

Footnotes

1 Research supported by the college of Agricultural and Life Sciences, University of Wisconsin, Madison and by North Central Breeders Research Council (East Central Breeders Cooperative, Waupun, Wisconsin; Midwest Breeders Cooperative, Shawano, Wisconsin; Minnesota Valley Breeders Cooperative, New Prague, Minnesota and Tri-State Breeders Cooperative, Baraboo, Wisconsin) and Ford Foundation Grant 630-0505A.

2 Paper No. 624 from the Department of Meat and Animal Science.

3 Department of Physiological Chemistry, Research Career Development Awardee NICHD 1-K4-HD-70, 006-01.






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Copyright © 1973 by the American Society of Animal Science.