Gestational length of Thoroughbred mares kept in tropical and subtropical climates

IF 2.5 2区农林科学 Q3 REPRODUCTIVE BIOLOGY Theriogenology Pub Date : 2024-12-21 DOI:10.1016/j.theriogenology.2024.12.017

Gabriela C. Silva , Carlos E.W. Nogueira , Rebeca Scalco , Gino L.B.L. Pizzi , Tatiane A. Leite , Rafaela Bastos , Bruna R. Curcio

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Abstract

Gestation length (GL) in horses varies widely, influenced by multiple variables, including maternal, fetal, and environmental factors. This study aimed to investigate and quantify the relative contributions of climatic (photoperiod and temperature-humidity index – [THI]), maternal (age and parity), fetal (sex) and environmental (year and month of foaling) variables influencing gestation length in Thoroughbred mares. Retrospective data encompassing 704 pregnancies across nine breeding seasons in tropical and subtropical Brazilian climates were analyzed. Stepwise regression analysis identified foaling month and year as the primary determinants of gestation length, with additional contributions from foal sex, mare age, parity, and THI. Subsequent multiple regression analysis ranked foaling month, mare age, and foaling year as the most significant factors, while parity, THI, and foal sex demonstrated smaller but statistically significant impacts. Gestation length in Thoroughbred mares is influenced by a complex interplay of environmental, maternal, and fetal factors, with foaling month, mare age, and foaling year being the most critical. These findings provide valuable insights for optimizing breeding management in tropical and subtropical climates.

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热带和亚热带气候下纯种母马的妊娠期长度。

马的妊娠期长短（GL）变化很大，受多种因素的影响，包括母体、胎儿和环境因素。本研究旨在探讨和量化气候（光周期和温湿指数[THI]）、母体（年龄和胎次）、胎儿（性别）和环境（产驹年份和月份）变量对纯种马妊娠期的相对贡献。回顾性分析了巴西热带和亚热带气候下九个繁殖季节的704次妊娠。逐步回归分析发现，产驹月份和年份是妊娠期长短的主要决定因素，此外，马驹性别、母马年龄、胎次和THI也有影响。随后的多元回归分析将产驹月份、母马年龄和产驹年份列为最显著的影响因素，而胎次、THI和马驹性别的影响较小，但具有统计学意义。纯种马的妊娠期长短受环境、母马和胎儿因素的复杂相互作用影响，其中产驹月份、母马年龄和产驹年份是最关键的。这些发现为优化热带和亚热带气候条件下的育种管理提供了有价值的见解。

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来源期刊

Theriogenology 农林科学-生殖生物学

CiteScore

5.50

自引率

14.30%

发文量

387

审稿时长

72 days

期刊介绍： Theriogenology provides an international forum for researchers, clinicians, and industry professionals in animal reproductive biology. This acclaimed journal publishes articles on a wide range of topics in reproductive and developmental biology, of domestic mammal, avian, and aquatic species as well as wild species which are the object of veterinary care in research or conservation programs.