Animal Production Research Institute (APRI), Agricultural Research Center (ARC), Ministry of Agriculture and Land Reclamation, Dokki, Giza, Egypt.
Department of Animal and Fish Production, Faculty of Agriculture, University of Alexandria, Alexandria, 21545, Egypt.
Trop Anim Health Prod. 2024 Apr 22;56(4):135. doi: 10.1007/s11250-024-03975-3.
Buffalo bull semen traits are economically important traits that influence farm fertility and profitability. Genetic improvement of semen characteristics is an important detail of the genetic improvement. This study was conducted to assess the relationship between the breeding values as well as the phenotypic values for semen traits (VOL, MM, LS, AS and CONC) of the Egyptian buffalo bulls. A total of 7761 normal semen ejaculates were collected and characterized at ILMTC laboratory from 26 bulls from 2009 to 2019. For VOL, MM, LS, AS, and CONC, the actual means were 3.89 mL, 62.37%, 60.64%, 3.94%, and 0.67 × 109 sperm/mL, respectively. The prediction of breeding values for semen traits was estimated using a Bayesian procedure. The estimated standardized EBVs and phenotypic values were used in the principal component analysis (PCA). Of five PCs, one PC (PC1) had > 1 eigenvalues that was responsible for 87.19% of the total variation of SEBV, and two PCs had > 1 eigenvalues that were responsible for 59.61% and 21.35% of the total variation of the phenotypic values. Together, PC1 and PC2 accounted for 97.97% of the total variance of SEBV and 80.96% of the total variance of phenotypic values. A graphs of the first two components showed the traits separated into two different directions by group. This indicates each group was under similar genetic influence. Therefore, selection can be done separately for each group without influencing the other. Principal component analysis reduced variables to describe the key information in buffalo semen data.
水牛公牛精液特性是影响农场繁殖力和盈利能力的重要经济性状。精液特性的遗传改良是遗传改良的一个重要细节。本研究旨在评估埃及水牛公牛的精液特性（VOL、MM、LS、AS 和 CONC）的育种值和表型值之间的关系。2009 年至 2019 年期间，在 ILMTC 实验室从 26 头公牛中收集了 7761 次正常精液样本并进行了特征分析。对于 VOL、MM、LS、AS 和 CONC，实际平均值分别为 3.89mL、62.37%、60.64%、3.94%和 0.67×109 个精子/mL。使用贝叶斯程序估计了精液特性的育种值预测。使用估计的标准化 EBVs 和表型值进行主成分分析（PCA）。在五个 PC 中，一个 PC（PC1）有超过 1 个特征值，占 SEBV 总变异的 87.19%，两个 PC 有超过 1 个特征值，占表型值总变异的 59.61%和 21.35%。PC1 和 PC2 共同占 SEBV 总方差的 97.97%和表型值总方差的 80.96%。前两个分量图显示性状按组分为两个不同方向。这表明每个组都受到相似的遗传影响。因此，可以对每个组进行单独选择，而不会影响其他组。主成分分析将变量减少到描述水牛精液数据关键信息。
