Genetic relationships between male and female reproductive traits in Retinta beef cattle

IF 1.8 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Livestock Science Pub Date : 2025-01-01 DOI:10.1016/j.livsci.2024.105610

José M. Jiménez , Rosa M. Morales , Sebastián Demyda-Peyrás , Antonio Molina

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引用次数: 0

Abstract

Scrotal circumference (SC) is an indirect measure used to predict the reproductive fitness of beef cattle raised in an extensive regime with limited seasonal breeding. It stands out for having a moderate to high heritability and favorable correlations, with seminal and reproductive quality traits in both the bull and its daughters. In the present study, we analyzed 2634 SC records of young bulls evaluated in testing stations for future bulls of the Retinta cattle Breed. The data was collected from 828 young bulls which produced 3,616 daughters. Monthly measurements of live weight, average daily gain, feed consumption, and SC were also performed in the bulls during testing. In addition, reproductive controls were performed in the daughters to estimate age at first calving (AFC) and reproductive efficiency (RE). We also estimated genetic parameters for the traits using a classical REML repeatability animal model. Average SC was 34.04 ± 2.43 cm. at 12 months, showing a heritability of 0.282 ± 0.052. Phenotypic (−0.05, 0.11, 0.42) and genetic (0.12, 0.15, −0.09) correlations were obtained between AFC and Reproductive Efficiency (RE) at 3, 6, and last calving and SC. These results suggest a strong environmental influence on the reproductive variables of daughters, probably motivated by the breeding model and the farmer's decision on the date of reproduction of the heifers. However, it can be seen that the AFC, RE3 and RE6 are more favorable for individuals with SC >37 cm, and more unfavorable for SC ≤32 in relation to SC >32 and ≤37. Finally, 85 of the bulls underwent sperm analysis using computer-assisted sperm analysis (C.A.S.A.) technology, using frozen semen samples belonging to the Retinta Breeding Program. Residual phenotypes for SC showed positive correlations with progressivity (0.11 in STR and LIN) and longevity (0.2 in L40 and 0.1 in L50). The highest r² was obtained using a canonical correlation, suggesting that a higher SC may improve sperm quality in bulls. It can therefore be confirmed that the use of this selection criterion (SC) in the breeding program of this breed will determine a response to positive selection, both for the fertility of the bull and its daughters.

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视网膜肉牛雌雄生殖性状的遗传关系

阴囊周长（SC）是一种间接测量方法，用于预测在有限的季节性繁殖条件下粗放型饲养的肉牛的生殖适宜性。它具有中等到高的遗传性和良好的相关性，与公牛和它的女儿的精液和生殖质量性状有关。在本研究中，我们分析了2634只在瑞塔牛品种的未来公牛测试站评估的年轻公牛的SC记录。研究人员从828头公牛身上收集了数据，这些公牛产生了3616只雌性公牛。在试验期间，每月测量公牛的活重、平均日增重、饲料消耗和体重。此外，对雌性进行生殖控制，以估计首次产犊年龄（AFC）和生殖效率（RE）。我们还使用经典的REML可重复性动物模型估计了这些性状的遗传参数。平均SC为34.04±2.43 cm。12个月遗传力为0.282±0.052。表型（- 0.05,0.11,0.42）和遗传（- 0.12,0.15,- 0.09）结果表明，AFC与第3、6次产犊和最后一次产犊的生殖效率（RE）和SC之间存在显著的相关关系。这些结果表明，环境对雌牛的生殖变量有很强的影响，这可能是由繁殖模式和农民对小母牛繁殖日期的决定所驱动的。但可以看出，相对于SC >；32和≤37，SC >；32 cm个体的AFC、RE3和RE6更有利，SC≤32 cm个体的AFC、RE3和RE6更不利。最后，85头公牛接受了计算机辅助精子分析（C.A.S.A.）技术的精子分析，使用的是属于瑞塔育种计划的冷冻精液样本。SC的剩余表型与进行性（STR和LIN为0.11）和寿命（L40为0.2，L50为0.1）呈正相关。使用典型相关获得最高的r2，表明较高的SC可能提高公牛的精子质量。因此，可以肯定的是，在该品种的育种计划中使用这种选择标准（SC）将决定对积极选择的反应，无论是对公牛还是它的女儿的生育能力。

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

Livestock Science 农林科学-奶制品与动物科学

CiteScore

4.30

自引率

5.60%

发文量

237

审稿时长

3 months

期刊介绍： Livestock Science promotes the sound development of the livestock sector by publishing original, peer-reviewed research and review articles covering all aspects of this broad field. The journal welcomes submissions on the avant-garde areas of animal genetics, breeding, growth, reproduction, nutrition, physiology, and behaviour in addition to genetic resources, welfare, ethics, health, management and production systems. The high-quality content of this journal reflects the truly international nature of this broad area of research.