J. Anim Sci.
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Journal of Animal Science, Vol 70, Issue 12 3838-3843, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

Steroids and plasminogen activator concentrations in follicular fluid of gilts at first and third estrus

G. D. Smith, A. R. Menino Jr, K. E. Rowe and F. Stormshak
Department of Animal Sciences, Oregon State University, Corvallis 97331-6702.

An experiment was conducted to determine whether morphological and functional characteristics of follicles differed at a similar stage of pubertal (first) and third estrus in the same gilts. Nine prepubertal gilts were checked three times daily for estrus and laparotomized 6 h after detected first and third estrus. Samples of vena cava and ovarian venous blood were collected, follicle numbers and diameters were recorded, and follicular fluid (FF) was aspirated from all follicles 8 to 12 mm in diameter. Sera and(or) FF were analyzed for progesterone (P4), estradiol-17 beta (E2), testosterone (T), androstenedione (A4), 5 alpha-dihydrotestosterone (DHT), plasminogen activator (PA), and plasmin (PLM). Overall mean number of follicles > or = 8 mm in diameter did not differ between gilts at first and third estrus (P > .05) but gilts at first estrus had more follicles 4 to 8 (P < .05) and 8.1 to 10 mm in diameter (P < .01) and fewer 10.1 to 12 mm in diameter (P < .07) than at third estrus. Mean FF concentrations of E2, T, and A4 at third estrus were significantly greater than at first estrus, whereas FF concentrations of P4, DHT, PA, and PLM were similar at first and third estrus (P > .05). Mean concentrations of E2 in systemic and ovarian venous sera were also greater in gilts at third than at first estrus (both P < .05). Systemic concentrations of P4 in gilts at first and third estrus did not differ (P > .05).(ABSTRACT TRUNCATED AT 250 WORDS)


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E. Jimenez, H. Cardenas, and W. F. Pope
Effects of Androgens on Serum Concentrations of Gonadotropins and Ovarian Steroids in Gilts
Biol Reprod, December 1, 2008; 79(6): 1148 - 1152.
[Abstract] [Full Text] [PDF]


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Copyright © 1992 by the American Society of Animal Science.