[性能试验群体大小对父系短期选择结果的影响]。

Hao Zhang, Jia-Qi Li, Chong Wang, Xiao-Hong Liu, Yao-Sheng Chen
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引用次数: 0

摘要

研究了群体规模、公母猪比、每窝试猪数对选择反应及其变异系数、近交系选择系数的影响。采用蒙特卡罗法模拟100 ~ 500头母猪的猪群,公母猪比分别为1:10和1:20。每窝试验猪数分别为2头和4头,公猪和后备猪各占1 / 2。选择的性状为断奶后平均日增重(ADG)和100 kg活重时背膘厚度(BF)。根据多性状BLUP选择种猪,设定BF经济重为平均日增重的2.5倍。经过五代选择,结果表明,繁殖群体母猪数量越多,第五代累积选择反应越高,每代近交增量系数越慢,第五代累积选择反应变异系数越小。提高每窝试验猪数和(或)母猪比可提高第5代累积选择反应、每代近交系数增量和第5代累积选择反应变异系数。当母猪数量从100头增加到300头时,在公母猪比和每窝试验猪数一定的情况下,累积选择反应增大,近交系系数的增加明显减缓。当母猪数量从300头增加到400头以上时,累积选择响应仅略有增加,近交系数继续下降,但下降幅度减小。综上所述,短期选育种猪时,建议种猪群规模在400头及以上,每窝4头试验猪,公母猪比保持在1:20。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Effect of population size of performance test on short-term selection result of sire line].

The effects of the population size,boar to sow ratio,and the number of pigs tested per litter on the selection response and its coefficient of variation, inbreeding coefficient of sire line selection were studied. Pig populations of 100 to 500 sows were simulated with Monte Carlo method,and the ratios of boar to sow were 1:10 and 1:20. The number of pigs tested per litter were 2 and 4 composed equally of boars and gilts. The traits selected were average daily gain after weaning (ADG) and backfat thickness (BF) at 100 kg live weight. Breeding pigs were selected according to multiple-trait BLUP,and economic weight of BF was set as 2.5 times of that of ADG. After five generation selection, the results showed that the more the number of sows of the breeding population, the higher the cumulative selection response at 5th generation, and the slower the coefficient of inbreeding increment per generation, the smaller the coefficient of variation of the cumulative selection response at 5th generation. Increasing the number of pigs tested per litter and/or the boar to sow ratio increased the cumulative selection response at 5th generation, inbreeding coefficient increment per generation, and the coefficient of variation of the cumulative selection response at 5th generation. The cumulative selection response got higher and the increment of inbreeding coefficient slowed down significantly when the number of sows in the breeding population increased from 100 to 300,and the ratio of boar to sow and the number of pigs tested per litter were fixed. When the sow number of breeding population was increased from 300 to 400 above,the cumulative selection response only increased slightly,and the coefficient of inbreeding continued to decrease but at a diminished rate. In conclusion, for the short-term selection of sire line, it is recommended that the breeding population should be composed of 400 or above sows, 4 pigs tested per litter,and the ratio of boar to sow should be maintained at 1:20.

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