Regulation Of Body Condition And Its Effect On Reproductive Performance In French Yorkshire Sows

Bright Agriculture and Animal Husbandry Technology Co.,Ltd.is a key project of the gradient transfer of live pig breeding in different places in Shanghai.In 2016,the production capacity has reached 1 million heads,accounting for 40%of the minimum number of live pigs in Shanghai.In order to improve the farm's pig breeding system and speed up the pace of breed improvement,on December 20,2012,the farm introduced more than 300 French new-generation Landrace,Yorkshire and other French breeding pigs.In November 2015,75 Duroc pigs were introduced.In December,260 French pigs were introduced from France.In November 2016,270 from Landrace and Duroc were again introduced.In order to make better use of these high-quality imported breeding pigs and their genetics.The farm combines the practical experience accumulated by participating in the national joint breeding of pigs,combined with the characteristics of the French Yorkshire sow,and has been exploring suitable Feeding plan and its effect.This program can guide the technical staff in the farm to better carry out the production work,and provide a set of easy-to-understand,systematic and comprehensive breeding pig feeding procedures and operations for the breeding of high-end breeding pigs that meet the needs of the development of the times,improving the performance of breeding pigs,etc.One:The effect of two different feeding plans on backfat and reproductive performanceSelect 100 gilts From the French original breeding gilts and their F1 generation,and they were divided into 2 groups(respectively the control group and the test group),each with 50 pigs.Control group apply feeding plan 1.Test group apply feeding plan 2.After delivery in the farrowing room,the piglets are adjusted to the same group only,that is,the experimental group and the experimental group,the control group and the control group can be fostered with each other.However,there is no foster between the experimental group and the control group.Record the total number of litters,live litters,mummies,stillbirths,birth weight,weaned numbers,weaned weights,and backfat changes.The results show that the feeding plan 2 is better than plan 1,which is beneficial to improve the farrowing performance of sows.Two:The effect of back fat on reproductive performance of Yorkshire sowSelected 300 sows from the Guangming core breeding farm which were inseminated from July to August 2016,all adopted the "high-low-high" feeding plan,and tracked the feeding situation throughout the whole process,respectively before delivery(110 days of gestation)And on the day of weaning(21 days of breastfeeding),the back fat measurement was performed at the back P2 point.The amount of backfat reduction of the same sow before delivery and weaning is its backfat loss during farrowing.Record the prenatal backfat,litter number,live litter number,weaning backfat,weaning litter weight and other complete data of sows before and after delivery to weaning for statistics.The results showed that sows of P2 backfat range of 16-18mm had the best performanceThree:The effect of back fat on reproductive performance of giltsTwo batches of 80 gilts were selected from the Guangming core breeding farm in 2016,and the backfat meter was used to measure the backfat on the day of mating and the 21st day of lactation,and count the backfat of the initial mating,the number of live litters,and weaning.Perform statistical analysis on data such as backfat and dislocation interval.The results show that gilts of backfat ranged 16-17mm had the best performance...