Double artificial insemination in sheep: a comprehensive review.

IF 1.6 4区 农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE
Animal Reproduction Pub Date : 2025-05-19 eCollection Date: 2025-01-01 DOI:10.1590/1984-3143-AR2024-0055
Gabriel Maggi, Fabiane Pereira de Moraes, Fernando Caetano de Oliveira, Sergio Farias Vargas, Arnaldo Diniz Vieira, Rafael Gianella Mondadori, Bernardo Garziera Gasperin
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引用次数: 0

Abstract

Artificial insemination (AI) in sheep presents variable results, especially when combined with estrus induction treatments during the anestrous period. Alternatives for obtaining better results without significantly altering the costs of hormonal protocols are essential because of the importance of this biotechnology in production systems. One alternative that potentially meets these requirements is double-AI. Therefore, this article aims to review the literature on double-cervical AI in sheep and identify gaps in existing knowledge. Double cervical superficial (CS) AI with frozen-thawed (F.T.) semen after estrus detection significantly increased pregnancy rates (PR) in most (6/8) evaluated studies, with an increase of 7 to 34.2 percentual points (p.p.), compared to single AI. Regarding fixed-time AI (FTAI), all studies used fresh (F) or chilled (C) semen, and no positive effects were observed for double FTAI in most cases (8/9). Most studies have not applied current estrous synchronization protocols and insemination doses. Therefore, further studies are needed to evaluate the potential benefits of double FTAI, especially using F.T. semen in combination with hormonal protocols and insemination doses aligned with current practices.

绵羊双人工授精技术综述。
人工授精(AI)在绵羊中表现出不同的结果,特别是当与发情期的发情诱导治疗相结合时。由于这种生物技术在生产系统中的重要性,在不显著改变激素方案成本的情况下获得更好结果的替代方案是必不可少的。一种可能满足这些要求的替代方案是双人工智能。因此,本文旨在回顾绵羊双颈椎人工智能的文献,并找出现有知识的空白。在大多数(6/8)评估的研究中,在发情检测后,双宫颈浅表(CS) AI与冻融(F.T.)精液显著增加了妊娠率(PR),与单次AI相比,增加了7至34.2个百分点(p.p)。关于固定时间人工授精(FTAI),所有的研究都使用新鲜(F)或冷冻(C)精液,在大多数情况下,双FTAI没有观察到积极的影响(8/9)。大多数研究没有应用当前的发情同步方案和授精剂量。因此,需要进一步的研究来评估双FTAI的潜在益处,特别是使用ft精液与激素方案和符合当前做法的人工授精剂量相结合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Animal Reproduction
Animal Reproduction AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
2.30
自引率
11.80%
发文量
49
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.
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