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Online Journal of Veterinary Research©
(including medical and laboratory research)
Volume 22 (10):952-960, 2018.
Effect of temperament on pregnancy and plasma progesterone and cortisol in cows receiving embryo transfers.
Jefferson Viana Alves Diniz DMV Esp MSc PhD1, Luis Mauricio Montoya-Florez DMV MSc PhD1,2, Andrey Luiz Lopes Cordeiro DMV MSc PhD1,3,
Rafael Augusto Satrapa DMV MSc PhD4, Eunice Oba DMV Esp MSc PhD5.
1Acre State Federal Institute, Rio Branco, Acre, Campus Universitário, Rio Branco - AC, 2Department of Clinical Veterinary Medicine, Faculty of Veterinary Medicine, São Paulo State University-UNESP, Botucatu, SP and Veterinary Pathology Research Group, Faculty of Agricultural Sciences, Universidad de Caldas, Manizales, Colombia, 3Animal Sanity and Sustainable Animal Husbandry Western Amazon, Acre State Federal University, Rio Branco, 4Biological and Natural Sciences Center, Acre State Federal University, Rio Branco, 5Faculty of Veterinary Medicine, São Paulo State University-UNESP, Botucatu, SP, Brazil.
Diniz JVA, Montoya-Florez LM, Lopez Cordeiro AL, Satrapa RA, Oba E., Effect of temperament on pregnancy and plasma progesterone and cortisol in cows receiving embryo transfers, Onl J Vet Res., 22 (10):952-960, 2018. In cows, stress can inhibit feeding, growth and reproduction. However cows can exhibit calm and/or reactive demeanors. We report plasma cortisol, progesterone and reproductive performances in cows exhibiting different temperaments. Hybrid cows (n=235) were synchronized by Fixed-Time Embryo Transfer (FTET) protocol later diagnosed as pregnant. Receptor cows underwent a behavioral assessment classified as having calm, slightly or very aggressive behavior. We found that behavior did not affect the response to the hormonal protocols for synchronization of ovulation or plasma cortisol levels. However we did find that very aggressive cow temperament reduced (P <0.05) plasma progesterone and pregnancy rates.
Keywords: Temperament; Pregnancy; Cortisol; Progesterone; Reproductive Efficiency.