Evolution over the last 40 years of the assisted reproduction technologies in cattle - the Brazilian perspective I - timed artificial insemination.

Autor:	Sales JNS; Departamento de Medicina Veterinária, Universidade Federal de Juiz de Fora, Juiz de Fora, MG, Brasil.; Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil., Pugliesi G; Departamento de Reprodução Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brasil., Carvalho LR; Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil., Simões LMS; Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil., Lemos LA; Departamento de Reprodução Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, Pirassununga, SP, Brasil., Vicente MP; Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil., Silva RRR; Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, MG, Brasil., Baruselli PS; Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, SP, Brasil.
Jazyk:	angličtina
Zdroj:	Animal reproduction [Anim Reprod] 2024 Aug 12; Vol. 21 (3), pp. e20240034. Date of Electronic Publication: 2024 Aug 12 (Print Publication: 2024).
DOI:	10.1590/1984-3143-AR2024-0034
Abstrakt:	The reproductive efficiency of the herd is correlated with higher productivity in livestock. Reproduction biotechniques, such as ovulation synchronization protocols, are important to optimize production and accelerate genetic profit in beef and dairy herds. The objective of this review is to describe the evolution over the last 40 years of the artificial insemination (AI) and the timed-AI (TAI) protocols in cattle from a Brazilian perspective. TAI protocols are based on synchronizing emergence of the wave of follicular growth, controlling circulating progesterone (P4) concentrations, stimulating the final growth of the follicle and inducing a synchronized ovulation. Hormonal alternatives that optimize the response at the end of the protocol and strategies to induce final follicle growth and ovulation in categories of females with low expression of estrus are described. Furthermore, the potential positive effect of previous exposure to injectable P4 on fertility of Bos indicus and Bos taurus cows is also discussed. Competing Interests: Conflicts of interest: The authors have no conflict of interest to declare. (Copyright © The Author(s).)
Databáze:	MEDLINE
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