Effects Of Mating Months And Parity On Productive Performance Of Bi-crossbreeding Sows And Tri-crossbreeding Sows

20617 litter of binary sows and 14548 litter of terre sows were selected.To analyze the effects of different mating months and parity on the reproductive performance of binary sows and terad sows,so as to better understand the gap of breeding life and reproductive performance of breeding pigs,and provide better ideas for stable production,management and breeding renewal of pig farms.At the same time,it provides theoretical basis for the subsequent introduction of seed provenance,gestational age structure,elimination ratio and mating timing of large-scale pig farms.The results showed that the reproductive performance of binary hybrid sows was significantly different in different months(P < 0.05),the reproductive performance of ternary hybrid sows was significantly different in different months(P < 0.05),and the reproductive performance of binary hybrid sows was significantly different from that of ternary hybrid sows in different months(P < 0.05).From the analysis of litter size,the difference was significant(P < 0.05)between the first litter of binary sows relative to the other litters,the difference was significant(P < 0.05)between the first litter of ternary sows relative to the other litters,and the difference was not significant(P > 0.05)between the other litters,and the reproductive performance of binary sows and ternary sows differed significantly(P < 0.05)both in month and litter size.Therefore,it can be concluded that mating months have an effect on reproductive performance of sows.In mating season,the reproductive performance of sows is better when the temperature is relatively low,while the reproductive performance of sows is relatively poor when the temperature is high.The reproductive performance of sows was affected by different parity,among which the reproductive performance of the first litter was generally poor,the second to fourth litter was the peak of reproductive performance,and the fifth litter began to decline.It also proved that the reproductive performance of binary hybrid sows was higher than that of ternary hybrid sows.