| The aims of this study were to investigate the reproductive performance of the sow herd production records in 2009 to 2012 period of a breeding pig farm in Shandong Province, todiscuss parity reasonable, advances in reproductive genetic phenotypic values. Therefore,SAS8.0 software was used to compare the effects of the different breed, parity, and season; and GBS software was used to analyze the reproductive traits using the BLUP model for genetic analysis and Mabry reproductive parameters index. The main results were as follows:1. The sow rationality affects the reproductive performance of sows. There was the highest swine litter size alive in 3rd to 6th parities in this study. Moreover, the parity ratio of 3-6 was 49.48% which is lower than the tire ideal parity ratio. Importantly, the higher thenumber has born alive parity the higher the proportion of the share, the better the reproductive performance of sows.2. The analysis of the reproductive performances between the different breeds, parityand season. The pig breeds can significantly affect the reproductive performance of sows(P<0.05). For example, the total average litter size of Yorkshire which significantly higher than Landrace and Duroc. The swine litter size alive of Yorkshire which significantly higher than Landrace and Duroc. The average litter size of Yorkshire was significantly higher than Duroc. The weaning litter weight and weaning weight of Yorkshire and Landrace were significantly higher than Duroc. Thelitter weight at birth of Yorkshire which, significantly higher than the Duroc. The birth weight of Yorkshire was significantly lower than Landrace and Duroc. In addition,parity also significantly affecting the reproductive performance(P < 0.05). The litter size and number of piglets born alive increase gradually from the first tire to the fourth tire. The fourth tire was significantly higher than the first tire, second tire, seventh tire, eighth tire.The third,fifth,sixth tire are significantly higher than the first and second tire.The weaning litter size ofis gradually increased from the first to the third tire,weaning litter size from second to fifth tire is significantly higher than the tire 6 and 7.The third tire was significantly higher than the first tire,so does the first tire than the tire 6,7,and 8.The sixth tire was significantly higher than the tire 7 and 8.The born litter weight of the third and fourth tire was significantly higher than other parities.The born litter weight of the fifth and sixth tire was significantly higher than that of the first,second,seventh and eighth tire.The born litter weight of the second,seventh and eighth tire was significantly higher than the first one.The weaning litter weight of second,third,fourth was significantly higher than other tires;the weaning litter weight offourth and fifth was significantly higher than the first sixth seventh eighth tire.The weaning litter weight of the first and sixth tire was significantly higher than the eighth tire.Seasonaffect reproductive performance significantly(P<0.05).Significantly more piglets were born in summer than that of winter,the difference between the spring and autumn was not significant.Larger piglets born alive in summer.Larger weaning litter size in summer compared with autumn and winter.The born litter weight in summer was significantly higherthan that in autumn and winter.The weaning litter weight in spring was significantly higher than that in autumn and winter.Breeding in winter,the conception rate and farrowing ratewere higher than other breeding seasons.3. Parity with the litter size, number of piglets born alive, healthypiglet, and the weaning litter sizeshowed a correlation curve. Parity with the litter size, number of piglets born alive, healthypiglet, weaning litter size by a quadratic polynomial trend line fitted regression equation was y =-0.084x2 + 0.8345 x + 9.6773, y =-0.0753x2 + 0.7063 x + 8.9451, y =-0.0664x2 + 0.5526 x + 7.8594, y =-0.0475x2 + 0.2817 x + 9.0602.4. Genetic parameters of reproductive traits and genetic progress of Mabry reproductive index.Heritability of reproductive traits: heritability in Duroc ranging from 0.011 to 0.222, Landrace from 0.009 to 0.192, Yorkshire from 0.006 to 0.126, all belong to the low heritability category. The differences between Genetic correlation and phenotypic correlation are not the same between different reproductive traits between the different varieties. Not only the phenotypic value selection in pigs were optional, but also make good use of GBS to strengthen the breeding value estimation software choice.Genetic progresses of Mabry reproductive index from 2009 to 2012 are as below:Yorkshire: 100.48, 101.66, 105.02, 104.23; Landrace: 99.37, 102.79, 103.94,104.39; Duroc:100.23, 101.99, 102.89, and 103.22.Number of piglets born alive in Yorkshire, Landrace, and Duroc were increased 0.37, 0.09, 0.53 respectively; EBV values were increased 0.13, 0.34, and 0.19 respectively.Correction of 21-day litter weight in Yorkshire, Landrace, and Duroc increased-3.41,-1.27, 5.36 respectively; EBV values were increased 1.61,-0.02, and 0.09 respectively.Weaning to first breeding Interval in Yorkshire, Landrace, Duroc increased-2.76, 0.36, 2.06 respectively; EBV values were increased 0.01, 0.02,-0.03 respectively.With precision feeding and management and the use of selective breeding depends on the value and reproductive index of GBS, the phenotypic value of reproductive traits and Mabry reproductive index had made continued genetic progress. |
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