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Genetic and non-genetic factors affecting semen production traits in Karan Fries crossbred bulls

机译：影响Karan Fries杂交公牛精液生产性状的遗传和非遗传因素

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The objective of the study was to evaluate the effects of genetic and non-genetic factors on production of breeding bulls and semen quality parameters in Karan Fries crossbred male by fitting least squares analysis. Genetically, the animals were divided into three subclasses. The non-genetic factors were season of birth, period of birth, and age group with three subclasses each for season of birth and period of birth. Age group was classified into four subclasses. The traits generated in the study were number of males reaching semen donation stage (AFSC) and first freezing (AFSF), age at last semen collection (ALSC) and last freezing (ALSF), age at disposal (AD), and lifetime semen production traits (up to 1 year after first freezing). The effect of period of birth was significant for AFSC, AFSF, ALSC, and AD. It was also significant for total ejaculates produced in a year. The age group had significant effect on AFSF. Effect of genetic group was significant for freezable ejaculates produced in a year, for frozen semen doses produced in a year, and for number of ejaculates cryoprocessed in a year. Season had no statistically significant effect on any of the traits studied. The influence of period revealed that the most of the traits of breeding bulls improved after intermediate period, which could be due to better care, training, feeding, and other management practices in the latter years. However, no consistent trend could be established for the effects of genetic groups and other non-genetic causes on the traits considered.
机译：这项研究的目的是通过最小二乘分析来评估遗传和非遗传因素对Karan Fries杂交雄性公牛生产和精液质量参数的影响。从基因上讲，这些动物分为三个亚类。非遗传因素是出生季节，出生时期和年龄组，每个三个子类分别是出生季节和出生时期。年龄组分为四个子类。研究中产生的特征是达到精液捐献阶段（AFSC）和初次冷冻（AFSF）的男性人数，最后一次精液收集的年龄（ALSC）和最后一次冷冻的男性（ALSF），可支配年龄（AD）和终生精液生产性状（第一次冻结后长达1年）。对于AFSC，AFSF，ALSC和AD，分娩期的影响显着。这对于一年中产生的总射精也很重要。年龄组对AFSF有显着影响。遗传群体的影响对于一年中产生的可冻结射精，一年中产生的冷冻精液剂量以及一年中经过冷冻处理的射精数量都非常重要。季节对所研究的任何性状均无统计学意义的影响。时期的影响表明，繁殖公牛的大部分特征在中期之后都得到了改善，这可能是由于后期的更好的照料，培训，喂养和其他管理实践。但是，对于遗传群体和其他非遗传原因对所考虑的性状的影响，尚无一致的趋势。

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