Daryatmo Iin Mulyawati, Juiputta Jiraporn, Chankitisakul Vibuntita, Boonkum Wuttigrai
Department of Animal Science, Faculty of Agriculture, Khon Kean University, Khon Kean 40002, Thailand.
Network Center for Animal Breeding and Omics Research, Khon Kaen University, Khon Kaen 40002, Thailand.
Animals (Basel). 2024 Jun 26;14(13):1881. doi: 10.3390/ani14131881.
The aim of this study was to analyze suitable genetic models and selection indices to estimate the genetic parameters and breeding values of native Thai roosters. A total of 3475 records of seven semen traits (mass movement, semen pH, semen color, volume, sperm viability, sperm abnormalities, and sperm concentration) from 242 Thai native grandparent roosters were analyzed. Multiple-trait random regression test-day models with five covariance functions were used to analyze the variance components, genetic parameters, and breeding values. The selection index (SI) was calculated to determine the optimal genetic value for different selection percentages. The results showed that a multiple-trait random regression test-day model with a second-order Legendre polynomial function was the most appropriate genetic model for this population. The estimated heritability values were low to moderate, ranging from 0.110 to 0.112 (mass movement), 0.040 to 0.051 (semen pH), 0.092 to 0.097 (semen color), 0.220 to 0.225 (semen volume), 0.067 to 0.083 (sperm viability), 0.086 to 0.099 (sperm abnormalities), and 0.134 to 0.138 (sperm concentration). The repeatability values exceeded the heritability values and were within the range of 0.133 to 0.688. The genetic correlations among semen traits ranged from -0.332 to 0.677, and phenotypic correlations ranged from -0.260 to 0.460. When considering heritability and genetic correlation values, semen volume, sperm concentration, and mass movement were the top three priority semen traits calculated as selection indices. Finally, the top 10% of the selection index was recommended for creating the next generation. Our findings provide useful information on genetic parameters and an appropriate selection index of semen traits for selecting the genetics of individual Thai native grandparent roosters. The heritability estimates for semen traits reported here suggest an adequate response to selection through a genetic evaluation approach. Our results indicate that it is possible to select grandparent roosters with better reproductive performance.
本研究的目的是分析合适的遗传模型和选择指数，以估计泰国本土公鸡的遗传参数和育种值。对242只泰国本土祖代公鸡的7种精液性状（活力、精液pH值、精液颜色、体积、精子活力、精子畸形率和精子浓度）的3475条记录进行了分析。采用具有五种协方差函数的多性状随机回归测定日模型来分析方差分量、遗传参数和育种值。计算选择指数（SI）以确定不同选择百分比下的最佳遗传值。结果表明，具有二阶勒让德多项式函数的多性状随机回归测定日模型是该群体最合适的遗传模型。估计的遗传力值较低到中等，范围为0.110至0.112（活力）、0.040至0.051（精液pH值）、0.092至0.097（精液颜色）、0.220至0.225（精液体积）、0.067至0.083（精子活力）、0.086至0.099（精子畸形率）和0.134至0.138（精子浓度）。重复性值超过遗传力值，范围在0.133至0.688之间。精液性状之间的遗传相关性范围为-0.332至0.677，表型相关性范围为-0.260至0.460。考虑到遗传力和遗传相关性值，精液体积、精子浓度和活力是作为选择指数计算的前三个优先精液性状。最后，建议选择指数排名前10%的个体用于繁育下一代。我们的研究结果为选择泰国本土祖代公鸡的遗传特性提供了关于遗传参数和精液性状合适选择指数的有用信息。此处报道的精液性状遗传力估计表明通过遗传评估方法对选择有足够的响应。我们的结果表明有可能选择出生殖性能更好的祖代公鸡。
