Effect of lactation length, season, and parity on the reproductive performance of sows

• Main Authors: Chang - Chi Lai, 賴長琦
• Other Authors: Ming-Yu Lu, Ph. D.
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/27978199557080746948

碩士 === 國立嘉義大學 === 動物科學系研究所 === 94 === This research is a collection of 18,326 pieces of data of the sows raised in 5 Taiwanses local pigsties, form 1994 to 1998 studying the effect of lactation length, season, and parity on the reproductive performance of sows. As the result shows, the lactation length of sows significantly affects the total pigs born alive per sow per year and the farrowing rate.As for the total pigs born alive per sow per year, for those whose lactation length ranges from 3 to 4 weeks, the numbers are 22.87 and 22.46 which is significantly more than those of 5 to 6 weeks, which are 21.92 and 21.34 (P < 0.05). As for the farrowing rate of sows, the lowest occurs when the length is 3weeks, only 78.89％, which is significantly lower than those of 4-6 weeks, which are 80.93％、81.20％and 81.26％ (P < 0.05). On the other hand, the result of the statistics also shows the parity、mating month、weaning month、the interation of lactation length、mating month、weaning month and the interation of parity、mating month、weaning month have an influence on the reproductive performance of sows.As for the influnce of parity on sows, the parity 2 of the pigs born alive per sow per year、weaning-to-service interval and farrowing-to-service interval are all worse than that of the parity 3-9 of sows (P < 0.05). As for the influnce of mating month and weaning month on sows, sows mating or weaning from Jan. to Mar. and from Oct. to Dec. their pigs born alive per sow per year is more than that of the mating and weaning form Mar. to Stp. sows (P < 0.05). As for the interation of lactation length、mating month and weaning month, they significantly affect the litters per sow per year、pigs born alive per sow per year and weaning-to-service interval. As for the interation of parity、mating month and weaning month, they significantly affects the litters per sow per year、farrowing rate and farrowing-to-service interval.