Possibilités De Superovulation Après Contrôle Du Cycle Œstrien Par l'ACÉTATE De Fluorogestone Chez Les Bovins

Mauléon, P.; Rey, José Luis; Mariana, J. C.; Benoit, Monique; Bézard, J.; Clérandeau, Françoise; Fontaubert, Y. de

doi:10.1051/rnd:19700505

Cited by 3 publications

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“…This contrasts with the situation when MGA alone is used to synchronize heat (Zimbelman, Lauderdale, Sokolowski & Schalk, 1970). Others have also found that HCG reduces the incidence of heat in cattle when given in conjunction with progestagens (Mauléon, Rey, Mariana & Benoit, 1970;Roche & Crowley, 1972) or when given alone for treatment of ovarian hypoplasia (Nakahara, Domeki & Yamauchi, 1970).…”

Section: Discussionmentioning

confidence: 99%

“…The oestrous cycle of cattle can be controlled by administering progesterone or one of its synthetic analogues (Lamond, 1964). The number of cows that show heat within a given period of time following treatment has, however, been inconsistent and fertility to natural and artificial matings at this heat is lower than normal (Hansel, 1967;Mauléon & Chupín, 1971). Both sperma¬ tozoa and eggs have a finite life-span in the reproductive tract of the female and their fertilizing ability declines with time.…”

Section: Introductionmentioning

confidence: 99%

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The Fertility of Heifers Inseminated at Predetermined Intervals Following Treatment With Mga and HCG to Control Ovulation

Roche¹,

Jp²

1973

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Oestrus and the time of ovulation were controlled in eighty-seven mature non-pregnant heifers by using silastic implants of MGA followed by an injection of HCG 48 hr after removal of the implants. The heifers were allocated at random to three groups and inseminated with frozen semen before the estimated time of ovulation. Animals in Groups 1 and 2 were inseminated once at 14 and 24 hr, respectively, after HCG while animals in Group 3 were inseminated twice 14 and 24 hr after HCG. All heats observed after insemination were recorded until the animals were killed 55 days later, when 23% of them were found to be pregnant. The conception rate was not affected by changing the time or the frequency of insemination. Possible reasons for the low fertility are discussed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%