Studies of FSH-P induced follicular growth in cows

Because cow ovaries do not contain a dominant follicle before Day 3 of the estrous cycle, we hypothesized that gonadotropin treatment early in the estrous cycle would induce growth of multiple follicles and could be used to induce superovulation. In Experiment 1, when 16 cows were treated with FSH-P...

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Veröffentlicht in:Theriogenology 1994, Vol.42 (1), p.43-53
Hauptverfasser: Fricke, P.M., Kirsch, J.D., Reynolds, L.P., Redmer, D.A.
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container_issue 1
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container_title Theriogenology
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creator Fricke, P.M.
Kirsch, J.D.
Reynolds, L.P.
Redmer, D.A.
description Because cow ovaries do not contain a dominant follicle before Day 3 of the estrous cycle, we hypothesized that gonadotropin treatment early in the estrous cycle would induce growth of multiple follicles and could be used to induce superovulation. In Experiment 1, when 16 cows were treated with FSH-P beginning on Day 2 of the estrous cycle and were slaughtered on Day 5, all cows responded to gonadotropin treatment by exhibiting a large number (≈ 19) of estrogenactive follicles ≥ 6 mm. In Experiment 2, in response to FSH-P treatment from Day 2 to Day 7, and fenprostalene treatment on Day 6, 11 of 15 cows exhibited estrus and had a mean ovulation rate of 23.7 ± 1.5. In Experiment 3, an FSH-P treatment regimen identical to that used in Experiment 2 was administered to cows beginning either on Day 2 (Day-2 cows; n=14) or Day 10 (Day-10 cows; n=11) of the estrous cycle. Twelve of 14 Day-2 cows and all Day-10 cows exhibited estrus after fenprostalene treatment. Day-2 cows exhibited 34.3 ± 7.0 ovulations, which was less (P < 0.05) than that exhibited by Day-10 cows (48.3 ± 4.4). However, the proportion of embryos recovered per corpus luteum was about 2-fold greater (P < 0.05) for Day-2 cows than for Day-10 cows (0.49 ± 0.08 vs 0.27 ± 0.06). These data indicate that beginning gonadotropin treatment early in the estrous cycle, when a dominant follicle is not present, provides an efficacious means to induce growth of multiple follicles and superovulation in cows. However, when FSH was administered for 6 d, beginning the treatment on Day 10 also resulted in a consistent and efficacious response.
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In Experiment 1, when 16 cows were treated with FSH-P beginning on Day 2 of the estrous cycle and were slaughtered on Day 5, all cows responded to gonadotropin treatment by exhibiting a large number (≈ 19) of estrogenactive follicles ≥ 6 mm. In Experiment 2, in response to FSH-P treatment from Day 2 to Day 7, and fenprostalene treatment on Day 6, 11 of 15 cows exhibited estrus and had a mean ovulation rate of 23.7 ± 1.5. In Experiment 3, an FSH-P treatment regimen identical to that used in Experiment 2 was administered to cows beginning either on Day 2 (Day-2 cows; n=14) or Day 10 (Day-10 cows; n=11) of the estrous cycle. Twelve of 14 Day-2 cows and all Day-10 cows exhibited estrus after fenprostalene treatment. Day-2 cows exhibited 34.3 ± 7.0 ovulations, which was less (P &lt; 0.05) than that exhibited by Day-10 cows (48.3 ± 4.4). However, the proportion of embryos recovered per corpus luteum was about 2-fold greater (P &lt; 0.05) for Day-2 cows than for Day-10 cows (0.49 ± 0.08 vs 0.27 ± 0.06). These data indicate that beginning gonadotropin treatment early in the estrous cycle, when a dominant follicle is not present, provides an efficacious means to induce growth of multiple follicles and superovulation in cows. 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However, the proportion of embryos recovered per corpus luteum was about 2-fold greater (P &lt; 0.05) for Day-2 cows than for Day-10 cows (0.49 ± 0.08 vs 0.27 ± 0.06). These data indicate that beginning gonadotropin treatment early in the estrous cycle, when a dominant follicle is not present, provides an efficacious means to induce growth of multiple follicles and superovulation in cows. 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subjects BOVIN DE BOUCHERIE
CHOIX DE LA DATE
CICLO ESTRAL
CORPS JAUNE
cows
CUERPO LUTEO
CYCLE OESTRAL
ELECCION DE LA EPOCA
ESTROGENOS
follicular growth
FSH-P
GANADO DE CARNE
OESTROGENE
OVULACION
OVULATION
PLASMA SANGUIN
PLASMA SANGUINEO
PROGESTERONA
PROGESTERONE
SUPEROVULACION
SUPEROVULATION
VACA
VACHE
title Studies of FSH-P induced follicular growth in cows
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