| Registro completo |
| Provedor de dados: |
PAB
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| País: |
Brazil
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| Título: |
Oral progesterone supplementation for beef cattle after insemination in TAI programs
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| Autores: |
Loiola,Marcus Vinícius Galvão
Bittencourt,Rodrigo Freitas
Rodrigues,Alexandra Soares
Ferraz,Priscila Assis
Lima,Marcos Chalhoub Coelho
Carvalho,Caio Victor Damasceno
Ribeiro Filho,Antonio de Lisboa
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| Data: |
2018-01-01
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| Ano: |
2018
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| Palavras-chave: |
Anestrous
Bovine
Fertility
Insemination
Melengestrol acetate
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| Resumo: |
Abstract: The objective of this work was to evaluate the effects of supplementation with melengestrol acetate (MGA), after timed artificial insemination (TAI), on the conception rate of Nellore cows, according to cyclicity during the protocol, estrus expression between intravaginal device withdrawal and insemination, and diameter of the largest follicle at the time of insemination, in order to identify predictors of the use of MGA. Multiparous lactating cows (577) were subjected to a hormonal protocol for ovulation synchronization. On day -2 of the protocol, the animals were painted with a marker on the base of their tail. On day 0, they were evaluated for estrus expression; the preovulatory follicle diameter (POFD) was measured by ultrasonography, and the artificial insemination was performed. The animals were assigned to two experimental groups according to the supplementation or not with 0.50 mg MGA, between 13 and 18 days after TAI. Pregnancy diagnosis was performed using an ultrasound examination 35 days after TAI. A positive effect of the treatment with MGA on the conception rate occurred generally in animals in anestrus, irrespective of the estrus expression. For animals treated with MGA, only those with POFD greater than 14 mm showed better conception rates that the control group.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000100105
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| Editor: |
Embrapa Secretaria de Pesquisa e Desenvolvimento
Pesquisa Agropecuária Brasileira
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| Relação: |
10.1590/s0100-204x2018000100012
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| Formato: |
text/html
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| Fonte: |
Pesquisa Agropecuária Brasileira v.53 n.1 2018
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| Direitos: |
info:eu-repo/semantics/openAccess
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