Evaluation of corpus luteum, uterine contractility and progesterone and estradiol plasmatic concentrations in recipients of bovine embryos

• Autor(a) principal: Leal, Luciana da Silva
• Data de Publicação: 2009
• Outros Autores: Oba, Eunice, Fernandes, Carlos Antônio de Carvalho, Sá Filho, Ocilon Gomes de
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Ciência animal brasileira (Online)
• Texto Completo: https://revistas.ufg.br/vet/article/view/448
• topic: Transferência de embriões; receptoras; progesterona; estradiol; prenhez

The aims of the present study were to evaluate the size of corpus luteum (CL), uterine contractility and plasma progesterone (P4) and estradiol (17? E2) concentrations in recipients, in the day of embryo transfer. For this, 60 crossbred recipient heifers were used. The pregnancy rate of recipients according to the CL size by rectal palpation was 70.0% (7/10 - small), 38.9% (7/18 - medium) and 60.0% (15/25 - large). Ultrasonographic evaluation detected 50.9% (29/57) of the CL with a cystic cavity. The average diameter of the CL was 17.8 ± 6.3 mm (n=57) and of cystic cavity was 6.8 ± 4.2 mm (n= 29). The mean volume of the CL was 4.4 ± 9.1 cm3 (n=57), of cystic cavity was 0.4 ± 1.0 cm3 (n=29) and of luteal mass was 4.2 ± 8.4 cm3 (n=57). In the day of the inovulation, progesterone and estradiol concentrations were respectively 4.9 ± 3.0 ng/mL (n=60) and 4.5 ± 6.0 pg/mL (n=60) in average. There was no statistic difference between progesterone and estradiol concentrations for pregnant and non-pregnant recipients. Forty-nine of the 60 recipients presented flaccid uterus (grade 1) and 11 had uterus in intermediate stage (grade 2). Those presented pregnancy rates of 47.6% (20/42) and 81.8% (9/11) (p