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RESEARCH ARTICLE
Contents Vol 22(1)

Bovine embryo transfer recipient synchronisation and management in tropical environments

Pietro S. Baruselli A E , Roberta M. Ferreira A , Manoel F. Sá Filho A , Luiz F. T. Nasser B , Carlos A. Rodrigues C and Gabriel A. Bó D
+ Author Affiliations
- Author Affiliations

A Departamento de Reprodução Animal, FMVZ-USP, CEP 05508-000 São Paulo, Brazil.

B FIRMASA-IATF, CEP 790020-210, Campo Grande-MS, Brazil.

C SAMVET Embriões, CEP 13560-000, São Carlos, SP, Brazil.

D Instituto de Reproducción Animal, Zona Rural General Paz, (5145) Córdoba, Argentina.

E Corresponding author. Email: barusell@usp.br

Reproduction, Fertility and Development 22(1) 67-74 https://doi.org/10.1071/RD09214
Published: 8 December 2009

Abstract

Numerous studies have shown that it is possible to manipulate follicular and luteal dynamics, thereby eliminating the need for oestrus detection in embryo transfer (ET) programmes. Fixed-time ET (FTET) protocols are based on the use of gonadotrophin-releasing hormone (GnRH) and prostaglandin (PG) F or progesterone/progestogen (P4)-releasing devices and oestradiol. The FTET protocols increases the proportion of recipients transferred, and therefore pregnancy rates, compared with the use of PGF followed by ET 7 days after oestrus. Furthermore, the addition of equine chorionic gonadotrophin (eCG) to the P4 and oestradiol-based FTET protocols results in an even higher proportion of recipients transferred, and thus higher pregnancy rates. The beneficial effect of eCG treatment may be related to increased growth of the dominant follicle and increased plasma P4 concentrations during the subsequent luteal phase. In Bos taurus × Bos indicus recipients, pregnancy rates were positively correlated with the diameter of the corpus luteum (CL) and the number of CL at ET. When repeat-breeder Holstein cows were used as recipients, FTET protocols increased number of recipients transferred and pregnancy rates compared with the traditional PGF-based synchronisation protocols. In conclusion, the use of FTET protocols eliminates the need for the detection of oestrus and results in a greater proportion of recipients transferred and satisfactory pregnancy rates. Thus, FTET optimises the use of recipients, reducing labour and animal handling and facilitating the use of ET.

Additional keywords: ovulation, progesterone, repeat breeder.


Acknowledgements

The authors thank Fundação de Apoio à Pesquisa do Estado de São Paulo and Conselho Nacional de Desenvolvimento Científico e Tecnológico for financial support of their work.


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