Effect of age and coasting period on oocytes quality and their in vitro development from prepubertal cattle
Journal Title: Revista MVZ Cordoba - Year 2011, Vol 16, Issue 2
Abstract
Objective. This study evaluated the effect of age and coasting period over oocyte quality and their posterior development under in vitro conditions from prepubertal Bos indicus crossbred donors. Material and methods. Donors females received a norgestomet implant and estradiol benzoate. Four days later a unique dosage of 150 IU of eCG was administered. Three coasting periods (24, 48, and 56 h) and four ages (3, 6, 10, and 12 months) were proved. All antral follicles were aspirated and an in vitro culture proceed was done. Results. 439 follicles were aspirated, of which 385 (87.7%) were 2-5 mm, 41 (9.33%) were 5-10 mm, and 13 (2.3%) were ›10 mm. After aspiration, a total of 373 oocytes (84.9%) were recovered, finding differences (p<0.05) between averages of 6 (9.3) and 10 months old animals (32.3). 285 (76.4 %) recovered oocytes were subjected to in vitro process. Cleavage values were significantly higher (p<0.05) in 10 (27.1%) and 12 months animals (26.8%). Although the number of transferable embryos was low, there were differences between ages (p<0.05) obtaining a higher percentage in age 3 (12.6%). Conclusions. A coasting period higher than 24 h has a negative effect on oocyte quality. Some oocytes from 3 months old calves were competent for in vitro embryo development; however, higher numbers of embryos were produced from 10 and 12 months of age prepuber females, indicating they have higher competency in vitro.
Authors and Affiliations
Sandra Bernal U, MVZ| Universidad de Ciencias Aplicadas y Ambientales UDCA, Facultad Ciencias Agrarias. Bogotá, Colombia., Ángela Gonella D, MVZ *| Universidad de Ciencias Aplicadas y Ambientales UDCA, Facultad Ciencias Agrarias. Bogotá, Colombia.Correspondencia: angelamvz@gmail.com, Diego Valbuena, MV| Central de procesamiento de semen y núcleo de mejoramiento Genético “Las Camelias”. Puerto Araujo, Colombia., Rubén Mendoza, MV| Central de procesamiento de semen y núcleo de mejoramiento Genético “Las Camelias”. Puerto Araujo, Colombia., Juan Molina, M. Sc| Intervet International B.V., Liliana Chacón J, Ph. D| Universidad de La Salle, Facultad de Medicina Veterinaria. Bogotá, Colombia.
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