UNILATERAL STIMULATION OF BOVINE OVARIES BY LOCAL INJECTION OF PREGNANT MARE'S SERUM GONADOTROPHIN
1974; Bioscientifica; Volume: 37; Issue: 1 Linguagem: Inglês
10.1530/jrf.0.0370101
ISSN1741-7899
Autores Tópico(s)Reproductive Physiology in Livestock
ResumoTreatment with PMSG is still the most widely used method of inducing superovulation in cattle. A major problem, however, is the great variation in response of individual animals to identical treatments (Foote & Onuma, 1970; Mariana, Mauléon, Benoît & Chupin, 1970). This variation may, in part, be due to differences in the absorption of injected PMSG and its subsequent distribution to the ovary. In rabbits, intraovarian rather than systemic injection is said to be a more sensitive test for PMSG in the Friedman pregnancy test (Chicchini & Chiacchiarini, 1963) and intrafollicular injection of LH also induces ovulation (Jones & Nalbandov, 1972). This report describes an investigation of the possibility that local injection of PMSG into bovine ovaries might produce more consistent superovulatory responses than do systemic injections. As outlined in Table 1, thirteen heifers of mixed breeding were used in fifteen experiments. Two heifers were used a second time (Exps
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