Optimizing feeding regimen of replacement gilts to improve their reproductive performance and retention rate of their first 2 parities

作     者：Jiajian Tan Miaomiao Wang Haiqing Sun Chao Wang Hongkui Wei Siwen Jiang Yuanfei Zhou Jian Peng Jiajian Tan;Miaomiao Wang;Haiqing Sun;Chao Wang;Hongkui Wei;Siwen Jiang;Yuanfei Zhou;Jian Peng

作者机构：Department of Animal Nutrition and Feed ScienceCollege of Animal Science and TechnologyHuazhong Agricultural UniversityWuhan 430070China Key Lab of Agricultural Animal GeneticsBreeding and Reproduction of Ministry of Education&Key Lab of Swine Genetics and Breeding of Ministry of AgricultureHuazhong Agricultural UniversityWuhan 430070China The Cooperative Innovation Center for Sustainable Pig ProductionWuhan 430070China Guangxi Yang Xiang Joint Stock CompanyGuigang 537000China 

出 版 物：《Animal Nutrition》 (动物营养（英文版）)

年 卷 期：2023年第12卷第1期

页      面：227-235页

核心收录：

学科分类：090502[农学-动物营养与饲料科学] 0905[农学-畜牧学] 09[农学] 

基　　金：This research was funded by the National Key Research and Development Project of China(NO.2021YFD1300401) the China Agriculture Research System(No.CARS-36) 

主　　题：Replacement gilts Rearing parameter Reproductive performance Retention rate 

摘      要：The effects of age,body weight(BW),and backfat thickness(BF)of replacement gilts at first estrus and first mating on their subsequent reproductive performance and retention of their first 2 parities as sows was evaluated.A total of 3,025 Danish replacement gilts were categorized by farm(allocated to 4 farms),cross combination,age,BW and BF at first estrus and first mating,estrous cycle number at first mating,and flush feeding before first *** result shows that all the factors mentioned above were significantly associated with reproductive performance and retention rates of the first 2 *** 3 had more piglets born alive per litter(BA)(P0.05).Farms 3 and 4 had more healthy piglets per litter(HP)(P0.05).Farm 4 had the most piglets weaned per litter(PW)(P0.05).Landrace×Landrace×Yorkshire(L×L×Y)replacement gilts had the most total piglets born per litter(TB),BA,HP,PW and a higher retention rate of the 2 parities than Landrace×Yorkshire(L×Y)replacement gilts(P0.05).In addition,flush feeding before first mating had the most TB,BA,HP,PW,and a higher retention rate of the 2 parities than no flush feeding(P0.05).Because the effects of replacement gilts rearing parameters on reproductive performance traits differed,we used 100 replacement gilts as a unit and the total number of weaned piglets from the first 2 parities as a new *** gilts undergoing their first estrus between 180 and 210 d of age at 115 to 124.9 kg BW and 14 to 15 mm BF had significantly higher reproductive indexes for their first 2 parities per 100 replacement *** gilts that mated between 210 and 230 d of age at 140 to 149.9 kg BW and 15 to 16 mm BF had optimal reproductive *** results provide a new insight into the complex relationships among these reproductive performance traits and may help guide successful management of replacement gilts as a pivotal starting point for future fertility and longevity of rearing herds.