Comparison the pregnancy rates between bovine recipients with cavitary or compact corpus luteum after cloprostenol or fixed time embryo transfer
DOI:
https://doi.org/10.5433/1679-0359.2006v27n4p657Keywords:
Corpus luteum, Ultra-som, Embryo transfer.Abstract
The aim of this work was to evaluate pregnancy rates in bovine embryo recipients with compact and cavitary corpus luteum. Two hundred and three crossbred heifers were divided in two groups. In the first group (G-PGF, n=103), the animals received 500 mg de Cloprostenol IM (Sincrocio, Ouro fino, Brasil) after CL identification by ultrasonography. After that, heifers were detected for heat the next 72 hours. The animals from second group (G-P4, n=100) received an intravaginal progesterone device (CIDR, Pfizer, Brasil) and 2 mg estradiol benzoate (Estrogin, Farmavet, Brasil) IM, in random stages from estrus cycle. On the 8th day the devices were removed and the animals received 500 mg of Cloprostenol IM. After 24h all animals received 1 mg BE, IM. The CL was identified and evaluated at 10 and 17 days after the beginning of the treatment in G-PGF and G-P4, respectively. All the heifers with CL received IVP embryos. The pregnancy diagnosis was made by transrectal ultrasonography after 23 days. The results were nalyzed by Chi-square. There were no significant difference in number of heifers ready to embryo transfer in G-PGF and G-P4, respectively 72.8% (75/103) e 79% (79/100); (P>0.05)Twenty one percent (16/75) had cavitary CL in G-PGF and 22.7% (18/79) in G-P4 (P>0.05). Among all embryo recipients with a cavitary or compact CL there was no difference on pregnancy rates (41.1% 14/34 and 38.3% 46/120, respectively, P>0.05), regardless of protocol treatment.
Metrics
Downloads
Published
How to Cite
Issue
Section
License
O Copyright dos manuscritos publicados pertence ao periódico. Como são publicados em um periódico de acesso aberto, eles estão disponíveis gratuitamente, para uso privado ou para fins educacionais e não comerciais.
A revista tem o direito de fazer, no documento original, alterações referentes às normas lingüísticas, ortografia e gramática, com o objetivo de garantir as normas padrão do idioma e a credibilidade da revista. No entanto, respeitará o estilo de escrita dos autores.
Quando necessário, alterações conceituais, correções ou sugestões serão encaminhadas aos autores. Nesses casos, o manuscrito deve ser submetido a uma nova avaliação após revisão.
A responsabilidade pelas opiniões expressas nos manuscritos é inteiramente dos autores.