Effect of phenylbutazone on pregnancy rates of embryo recipient mares

• Autor(a) principal: Duarte, Marcelo Barbanti
• Data de Publicação: 2006
• Outros Autores: Vieira, Rogerio Chaves
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Bioscience journal (Online)
• Texto Completo: https://seer.ufu.br/index.php/biosciencejournal/article/view/6500
• topic: Phenylbutazone; Embryo Transfer; Recipient; Mares.

The aim of this experiment was to evaluate the pregnancy rates for equine embryo recipients with different degrees of uterine tone (absent, fair moderate, intense), treated with phenylbutazone (PBZ). Thirty-two Paint Horse breed donors and 96 Mangalarga recipients were used during the 2001/2002 breeding season (October to January). The embryos were collected 8 days after ovulation, classified and then transferred non-surgically. At the time of transfer, the recipients were divided into groups A to E according to uterine tone. Group A (n = 19) consisted of recipients with absent or fair uterine tone, which were not treated and received only the embryo; Group B (n = 14) consisted of recipients with absent or fair uterine tone, treated with 1 dose of 2 g PBZ; Group C (n = 11) consisted of recipients with absent or fair uterine tone, treated with 3 doses of 2 g PBZ, repeated at eight hour intervals; Group D (n = 23) consisted of recipients with moderate or intense uterine tone, treated with 1 dose of 2 g PBZ; Group E (n = 29) consisted of recipients with moderate or intense uterine tone, which were not treated and received only the embryo. At day 35 post embryo transfer the total pregnancy rate was 63.5%, being 36.8% (07/19); 35.7% (05/14); 63.6% (07/11); 82.6% (19/23) and 79.3% (23/29) for Groups A, B, C, D and E, respectively. The pregnancy rate for Group C was not significantly different from those observed in Groups D and E, but was higher (P