Recombinant bovine somatotropin in the synchronization of ovulation in crossbred dairy cows (Bos taurus indicus × Bos taurus taurus)
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Published:2020
Issue:4
Volume:13
Page:746-750
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ISSN:2231-0916
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Container-title:April-2020
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language:en
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Short-container-title:Vet World
Author:
Oliveira Fabrício Albani1ORCID, de Almeida Ítalo Câmara2ORCID, Sena Larissa Marchiori3ORCID, Penitente-Filho Jurandy Mauro4ORCID, Torres Ciro Alexandre Alves4ORCID
Affiliation:
1. Federal Institute of Espirito Santo, Alegre, Espirito Santo, 29520-000, Brazil. 2. Department of Veterinary Medicine, Federal University of Espirito Santo, Alegre, Espirito Santo, 29500-000, Brazil. 3. Pitágoras College, Ipatinga, Minas Gerais, 35160-294, Brazil. 4. Department of Animal Science, Federal University of Viçosa, Campus Universitário, Viçosa, Minas Gerais, 36571-000, Brazil.
Abstract
Aim: The aim of this study was to evaluate the effects of the administration of recombinant bovine somatotropin (rbST) at the moment of implementation of the timed artificial insemination protocol, on follicular dynamics and pregnancy rate in crossbred cows.
Materials and Methods: A total of 346 cows were used in two experiments with a factorial 2×2 design. The cycling cows (Tcycling) and the anestrous cows (Tanestrous) were considered as factor 1 and the administration of rbST (TrbST) or not (Tcontrol) as factor 2. The experimental protocol: (1) Tcontrol – day 0 (D0), insertion of a progesterone-release intravaginal device (PRID) plus 2 mg of estradiol benzoate (EB); D8, PRID removal, plus 0.150 mg of prostaglandin F2α, and 400 IU of equine chorionic gonadotropin; D9, 1 mg of EB; and with artificial insemination at day 10; (2) TrbST – similar to Tcontrol plus 500 mg of rbST on D0. In experiment I, ultrasound examinations were performed in all treatments. In experiment II, the cows' pregnancy rate was evaluated. Data were analyzed with 5% probability.
Results: There was no effect of the protocols on cows cyclicity or follicular growth rate (p>0.05). There was no interaction of the effects, administration of rbST, and the cyclicity of cows on the pregnancy rate. The total pregnancy rate observed was 49.0%. The pregnancy rate in cows receiving rbST was lower for anestrous compared with cycling cows (p<0.05).
Conclusion: The administration of rbST did not alter the patterns of follicular dynamics nor the ovulation rate. However, cows in anestrous that received rbST had lower pregnancy rates than cycling cows.
Funder
Conselho Nacional de Desenvolvimento Científico e Tecnológico Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Publisher
Veterinary World
Subject
General Veterinary
Reference31 articles.
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