| Autor: |
de Carvalho Menezes de Almeida SF; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil., Souza-Fabjan JMG; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil. joannavet@gmail.com., Balaro MFA; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil., Bragança GM; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil., Pinto PHN; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil., de Almeida JG; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil., Moura ABB; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil., da Fonseca JF; Embrapa Goats and Sheep, Núcleo Regional Sudeste, CEJHB-Embrapa Gado de Leite, Rodovia MG133, km42, Cep 36, Coronel Pacheco, MG, 155-000, Brazil., Brandão FZ; Faculty of Veterinary Medicine, Fluminense Federal University, Av. Vital Brasil Filho, 64, CEP, Niterói, RJ, 24230-340, Brazil. |
| Abstrakt: |
This study evaluated the effect of two doses of prostaglandin at different intervals on reproductive parameters of crossbred ewes. In Experiment 1, 30 ewes received two doses of 120 μg cloprostenol at 7 (G 7 days ), 9 (G 9 days ), or 11.5 (G 11.5 days ) days apart. Ultrasound assessments were performed from the first and second cloprostenol administration for 5 days or ovulation detection. Estrus signs were checked by a teaser male. Plasma progesterone concentration was measured before each cloprostenol dose. In Experiment 2, 95 ewes were allocated into the same treatments and after the second dose, ewes in estrus were mated. At 30 days after breeding, pregnancy diagnosis was conducted and prolificacy was evaluated at lambing. In Experiment 1, at the first cloprostenol administration, 50% of ewes had an active CL and all showed estrus. At the second administration, 66.7% of ewes had an active CL and one did not present estrus. There was no difference (P > 0.05) after the second dose for as follows: overall estrous response (90%), interval from cloprostenol administration to estrous onset (42.0 ± 4.9 h), estrus duration (31.5 ± 2.1 h), ovulation rate (100.0%), and number of ovulations (1.5 ± 0.3). In Experiment 2, both pregnancy and prolificacy rates were similar (P > 0.05) for G 7 days (73.3; 145%), G 9 days (75.9; 125%), or G 11.5 days (75.9; 145%), leading to an overall pregnancy rate of 75.0% (66/88) and prolificacy rate of 137% . Therefore, the three treatments proposed were able to promote high pregnancy and prolificacy rates in crossbred ewes. |
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