动物气质对肉牛身体和生殖发育的影响。

IF 2.2 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Animal Reproduction Science Pub Date : 2025-01-26 DOI:10.1016/j.anireprosci.2025.107788

Mariana Karla Francolino da Silva , Marcilio Nichi , Marcelo Sant’Ana Borges , Richardt Gama Landgraf , Marcelo Francisco Arantes Pereira , André Maciel Crespilho

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引用次数: 0

摘要

几项研究表明，反应性气质与牛较差的生产和繁殖性能有关。然而，尚无研究旨在探讨气质对雄性牛性发育和性早熟的影响。本研究的目的是验证反应性动物表现出性发育延迟和生殖性能较差的假设。选用12月龄的杂交雄性牛（Nellore x Santa Gertrudis） 40头。这些动物进行了行为评估，并被分为两组：平静（CA）；n = 24)和反应性(RE；n = 16)。所有的牛都称重以监测体重增加，并收集血液样本以测量皮质醇和睾酮浓度。通过电射精收集精液来确定青春期的开始和评估精子质量。进行低温保存试验，并评估样品的动力学和质膜完整性。超声检查评估睾丸发育。此外，进行睾丸活检以评估精细胞和精子的比例。RE动物有较高皮质醇生成的趋势（P = 0.07）。CA动物的总增重（P = 0.03）、平均增重（P = 0.07）和日增重（P = 0.06）较高。RE组产生较少精子缺陷的细胞比例较高（P = 0.06）。CA动物的水疱腺发育较大（P = 0.01）。没有观察到气质对性早熟、低温耐受性或睾酮产生的影响。结果表明，虽然性情对青春期年龄没有影响，但反应性公牛在身体发育、水疱腺发育和新鲜精液质量方面的表现较冷静性公牛差。

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Influence of animal temperament on body and reproductive development of beef bulls

Several studies have related reactive temperament to poorer productive and reproductive performance in cattle. However, no studies have aimed to investigate the effect of temperament on sexual development and precocity of male cattle. The objective of this study was to test the hypothesis that reactive animals exhibit delayed sexual development and poorer reproductive performance. For the study, 40 crossbred male cattle (Nellore x Santa Gertrudis) at 12 months were selected. The animals underwent behavioral evaluation and were divided into two groups: calm (CA; n = 24) and reactive (RE; n = 16). All steers were weighed to monitor weight gain, and blood samples were collected to measure cortisol and testosterone concentrations. Semen collections by electroejaculation were performed to determine the onset of puberty and assess sperm quality. Cryopreservation tests were conducted, and the samples were evaluated for kinetics and plasma membrane integrity. Ultrasound examinations assessed testicular development. Additionally, testicular biopsies were performed to evaluate spermatid and spermatozoa ratios. There was a trend toward higher cortisol production (P = 0.07) in RE animals. Higher total (P = 0.03), average (P = 0.07), and daily (P = 0.06) weight gains were observed for CA animals. RE steers produced a higher proportion of cells with minor sperm defects (P = 0.06). Greater vesicular glands development was observed in CA animals (P = 0.01). No effect of temperament was observed on sexual precocity, cryotolerance, or testosterone production. It was concluded that although temperament does not influence age at puberty, reactive bulls exhibit poorer performance in body development, vesicular glands development, and fresh semen quality compared to calm bulls.

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来源期刊

Animal Reproduction Science 农林科学-奶制品与动物科学

CiteScore

4.50

自引率

9.10%

发文量

136

审稿时长

54 days

期刊介绍： Animal Reproduction Science publishes results from studies relating to reproduction and fertility in animals. This includes both fundamental research and applied studies, including management practices that increase our understanding of the biology and manipulation of reproduction. Manuscripts should go into depth in the mechanisms involved in the research reported, rather than a give a mere description of findings. The focus is on animals that are useful to humans including food- and fibre-producing; companion/recreational; captive; and endangered species including zoo animals, but excluding laboratory animals unless the results of the study provide new information that impacts the basic understanding of the biology or manipulation of reproduction. The journal''s scope includes the study of reproductive physiology and endocrinology, reproductive cycles, natural and artificial control of reproduction, preservation and use of gametes and embryos, pregnancy and parturition, infertility and sterility, diagnostic and therapeutic techniques. The Editorial Board of Animal Reproduction Science has decided not to publish papers in which there is an exclusive examination of the in vitro development of oocytes and embryos; however, there will be consideration of papers that include in vitro studies where the source of the oocytes and/or development of the embryos beyond the blastocyst stage is part of the experimental design.