| The productive performance of sow is directly related to the development and profitability of pig farms as which is the core of intensive,large-scale pig farms.Genetic and environmental are the main two factors in affecting the production performance of sows,and parity,mating month and birthing month are the important environmental factors in environmental.In the present study,a total of 6,652 and 6364 nest sow productive performance data from A and B pig farms were collected,and analyzed by Excel and SPSS19.0 software,the results showed as follows.In the data of A pig farm（five parities in total）,the total number born and weaning weight were 10.53±0.07 piglets and 60.27±0.47Kg,while they were not significant in each parities（P>0.05）.The living piglets,weaned litter size and litter weight of 1st parity were lowest,which significantly lower than the 2nd5thparities（P<0.05）,while the abnormal number,mummy number,stillbirth number and return times of the 1st parity were most,which significantly more than the 2nd5thparities（P<0.05）.In the data of B pig farm（ten parities in total）,the stillbirth number were not significant in each parities（P>0.05）.The total number born,living piglets,abnormal number and living piglets of 5 days after birth were worst in 1st,2nd,10thparities,and showing much better in 6th8thparities,which significantly better than other parities（P<0.05）.Each mating month has no significant effect on total number born and abnormal number of A pig farm（P>0.05）.A comprehensive analysis of the live litter size,abnormal number,mummy number,stillbirth number,litter weight,return times,weaning litter size and weaning weight of each index in the different mating months showed that the December mating months of sows own the optimal production performance,which was significant better than other months（P<0.05）,follows July,August,September,October,November,while January,February,March,April,May have the poor production performance.In addition,the data from B pig farm showed similaritypattern with B pig farm in mating month.Each birthing month has different effects on sow’s production performance of A and B pig farms.In A pig farm,the total number born of May,August and October were significant higher than other months,which can reach 10.64±0.11 piglets.The live litter size of March,April and May were significant higher than other months,which can reach 9.89±0.13 piglets.The abnormal number of April was significant lower than other months,which was only0.08±0.01 piglets.The birth weight of January,February,March,April,May were significant higher than other months,which can reach 14.73±0.19 kg.The weaning weight of January,February,March,May,December were significant higher than other months,which can reach 34.50±1.56 kg.In B pig farm,the total number born of March,April and May were significant higher than other months,which can reach 13.32±0.10 piglets.The live litter size of April,May,June,July,August,September and October were significant higher than other months,which can reach 12.26±0.10 piglets.The stillbirth number of April,May,September,November and December were significant lower than other months,which was only0.06±0.01 piglets.The birth weight of February,March,April were significant higher than other months,which can reach 17.48±0.23 kg.Comprehensive the data of production performance of two pig farms showed that sows which birthing April and May will get better production performance. |
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