| Through the investigation and analysis of the production performance records of 2016-2017 years in the core breeding pig farm of a country in Anhui Province,the effects of different varieties and parity on the reproductive performance of sows and the difference of the growth performance of different kinds of back-up pigs were compared.The EXCEL software was used to sort out the main productive phenotypic values of the sows,and the production was discussed.The genetic trend of phenotypic values of the traits and the breeding progress of the population from 2012 to 2015 were evaluated to provide basic data and scientific basis for the production and breeding of the breeding pigs.The results are as follows:1.There was significant difference in the production performance of different sows: the variety factor could significantly affect the reproductive performance of the sows.The average litter size and the average litter size of the sows were significantly higher than that of the Yorkshire(P<0.05),and the Yorkshire was significantly higher than the Durok(P<0.01).The average number of deformities per litter was significantly higher than that of Duroc and Yorkshire(P<0.01),and there was no significant difference between Yorkshire and Duroc.There were no significant differences in the average litter size and litter size between the three breeds.The average number of births and deaths was significantly higher than that of Duroc and Landrace(P<0.05),but there was no significant difference between Landrace and Yorkshire.The average number of healthy litter was significantly higher than that of Yorkshire and Duroc(P<0.01),and Yorkshire was significantly higher than that of P<0.01.In terms of growth performance,the 100 KG weight correction was significantly higher(P<0.05)than the Yorkshire sow and the Duroc sow,and the great Yorkshire sow(P<0.05)was higher than the Duroc sow.100 KG weight adjusted back fat Duroc was significantly(P<0.01)higher than Landrace sows,and Landrace sows were significantly higher(P<0.01)than those of Yorkshire sows.2.During the period from 2012 to 2014,the growth performance and reproductive performance of three varieties had made great progress,and declined from 2014 to 2015.In order to improve the growth performance of big York and long white pigs,it is suggested that we should strengthen the selection in the process of future breeding and adjust the selection index in view of the actual problems.In the actual production,the sow with poor performance will be eliminated in time,and more efforts should be made to make progress.3.The number,the number of deformities and the number of the average litter size,the number of deformities and the number of healthy litter of Landrace and Yorkshire were fitted by the binomial.The regression equations were y =-0.096x2 + 1.076 x +10.248,y =-0.014x2 + 0.117 x + 0.01,y =-0.02x2 + 0.521 x + 9.447,y = 0.154x2-1.074 x + 14.448,y = 0.008x2-0.042 x + 0.194,y =-0.105x2 + 0.775 x + 11.753?Conclusion: the results show that the breeding performance of the sow is better than that of Durok and Yorkshire,and the growth performance of Duroc is better than that of Yorkshire and Landrace.Therefore,it is suggested that in the production of the pig,the two yuan hybrid mother and Durok as the terminal parent were used in combination with the shape appearance and market conditions.From 2012 to 2014,great progress was made in the breeding of the three varieties.The paternity index and maternal index increased year by year from 2012 to 2014,and the growth performance was also increasing,but the breeding values of three varieties from 2014 to 2015 were all declining,but the overall breeding process continued to continue.From 2012 to 2015,the breeding performance of Duroc and Landrace was progressed,and the breeding of Yorkshire reproductive performance decreased slightly. |
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