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

IF 2.1 4区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE Animal Reproduction Pub Date : 2024-08-12 eCollection Date: 2024-01-01 DOI:10.1590/1984-3143-AR2024-0034

José Nélio de Sousa Sales, Guilherme Pugliesi, Laís Reis Carvalho, Luiz Manoel Sousa Simões, Lucas Araujo Lemos, Matheus Pedroso Vicente, Rafael Resende Rabelo Silva, Pietro Sampaio Baruselli

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Abstract

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.

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过去 40 年牛辅助生殖技术的演变--巴西视角 I--定时人工授精。

畜群的繁殖效率与牲畜的高生产力息息相关。生殖生物技术，如排卵同步方案，对于优化生产和加快肉牛和奶牛遗传收益非常重要。本综述旨在从巴西的角度描述过去 40 年间牛人工授精（AI）和定时人工授精（TAI）方案的演变。定时人工授精（TAI）方案基于卵泡生长波的同步出现、控制循环孕酮（P4）浓度、刺激卵泡的最终生长和诱导同步排卵。此外，还介绍了可优化方案结束时的反应的激素替代品，以及诱导发情表现低的雌性最终卵泡生长和排卵的策略。此外，还讨论了先前注射 P4 对麝香牛和金牛繁殖力的潜在积极影响。

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来源期刊

Animal Reproduction AGRICULTURE, DAIRY & ANIMAL SCIENCE-

CiteScore

2.30

自引率

11.80%

发文量

审稿时长

70 days

期刊介绍： Animal Reproduction (AR) publishes original scientific papers and invited literature reviews, in the form of Basic Research, Biotechnology, Applied Research and Review Articles, with the goal of contributing to a better understanding of phenomena related to animal reproduction. The scope of the journal applies to students, researchers and practitioners in the fields of veterinary, biology and animal science, also being of interest to practitioners of human medicine. Animal Reproduction Journal is the official organ of the Brazilian College of Animal Reproduction in Brazil.