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Utilização da prostaglandina F2 alfa (PGF2 alfa) na sincronização do ciclo estral em bovinos. II. Inseminações artificiais praticadas em horários pré determinados, com observação de sintomas de cio

1976; Volume: 13; Issue: 2 Linguagem: Inglês

10.11606/issn.2318-3659.v13i2p367-376

2318-3659

Valquíria Hyppollto Barnabe, Raul Gastão Mucciolo, Renato Campanarut Barnabé,

Genetic and phenotypic traits in livestock

Feasibility of breeding cattle at a predetermined time, in spite of regarding estrus detection, was investigated in nulliparous cows crossed of Zebu and Holstein or Jersey breed. Forty animals were assigned randomly to two treatments. Treatment 1 (n = 20) included animals day 5 to 16 of the oestrus cycle and was an injection of 4 mg PGF2 alfa in to the uterine horn ipsilateral to the active corpus luteum, followed by A l at 72 and 80 hs post PGF2 alfa. Treatment 2 serving as control (n=20) was Al at standing estrus during a 60-day period. PGF2 alfa (1) resulted in 70.0% of the animals in estrus within 2.5 ± 0.2 days. Percent pregnant (60 days post -AI) of those assigned to treatments 1 and 2 were 28,5% and 25,0%.respectively. Differences between treatments were not significant. The possibility of therapeutic utilization of PGF2 alfa is commented.