Reproductive parameters of Sindhi cows (Bos taurus indicus) treated with two ovulation synchronization protocols

Revista Brasileira de Zootecnia

Silva, Bernardo Janella Ferreira da¹  Mello, Raquel Rodrigues Costa¹  Silva, Ana Paula Toledo Barbosa da¹  Palhano, Helcimar Barbosa¹  Mello, Marco Roberto Bourg de¹  Mascarenhas, Leandro Mendes¹  Cardoso, Beatriz de Oliveira¹  Ferreira, Joaquim Esquerdo¹ 

[1] UFRRJ

关键词: eCG;    follicular growth;    reproduction;    zebu    Introduction The Brazilian cattle herd consists of more than 200 million of animals (MAPA;    2010);    and zebu cattle corresponds to approximately 80% of that heritage;   

DOI  :  10.1590/S1516-35982013000600005

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The objective of this study was to evaluate the reproductive parameters of Sindhi cows aiming to improve the efficiency of fixed-time artificial insemination protocols in this breed. For this purpose, sixteen Sindhi cows were divided into two groups: in group I (EB, n = 8) animals received an intravaginal P4 implant and an application of 2 mg of estradiol benzoate on day 0. On day 8 the implant was removed and 10 mg of Dinoprost were applied; on day 9, 1 mg of estradiol benzoate was applied, and animals were fixed-time artificially inseminated 36 hours later; in group II (EB + eCG, n = 8) animals were subjected to same treatment, and on day eight 400 IU of eCG were applied. From day 0 animals were examined daily by a trans-rectal ultrasound device, where in each assessment the largest follicles of each day were measured. The reproductive parameters observed for groups I and II were: emergence of follicular wave, 4.5±1.4 and 3.8±0.3 days; interval between wave emergence and ovulation, 5.8±1.4 and 7.1±0.3 days; interval between wave emergence and implant removal, 3.5±1.4 and 4.1±0.3 days; interval between implant removal and ovulation, 74.0±11.8 and 82.5±4.2 hours; diameter of the dominant follicle (DF) at the time of implant removal, 7.5±2.5 and 6.6±1.5 mm; maximum diameter of DF, 10.47±8.85 and 3.7±1.2 mm; growth rate of DF, 0.90±0.83 and 0.7±0.6 mm/day; ovulation rate, 75% and 100%; and pregnancy rate, 0% and 50%, respectively. There was no significant difference between the groups. We observed that eCG was not efficient in improving the reproductive parameters analyzed in this breed.

【 授权许可】

CC BY-NC