Induced abortion in cattle
1977; Elsevier BV; Volume: 7; Issue: 2 Linguagem: Inglês
10.1016/s0093-691x(77)80002-2
ISSN1879-3231
Autores Tópico(s)Reproductive Physiology in Livestock
ResumoSeveral procedures were used to abort cattle during the second and third trimesters of gestation. The treatment to abortion interval was better (P<0.05) when dexamethasone trimethyiacetate (DTMA) injections repeated at either 6 or 4 day intervals than when a single injection of DTMA was followed 6 days later by the administration of stilboestrol. The treatment to abortion interval was not significantly shorter when DTMA was repeated after 4 days rather than 5 days (0.10 0.05). Prostaglandin F2α produced abortion 1 to 4 days following direct administration into the foetai fluids. Peripheral plasma progesterone concentration had a tendency to rise immediately following the second injection of DTMA given at a 6 day interval. This was followed by a decline. Two injections of DTMA given at 4 day intervals resuited in a decline in progesterone concentration. Abortion occurred when plasma progesterone concentrations were about 1 ng/ml in cows treated with DTMA. In cows treated with prostagiandin F2α the plasma progesterone concentration fell rapidly within one day of administration to approximately 2 ng/ml, at which concentration abortion took place.
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