氯前列醇钠、产前背膘厚及便秘对后备母猪同期分娩效果的影响

doi:10.16431/j.cnki.1671-7236.2021.04.019

Abstract

Abstract: The aim of this study was to investigate the effect of cloprostenol sodium,antepartum backfat thickness,and constipation on gilts synchronized parturition and reproductive performance following farrowing induction.Furthermore,the optimal scheme of synchronous parturition for primiparous was discussed.A total of 295 gilts were involved in this study.The backfat thickness at point P2 was measured on 110 d of gestation,and gilts were randomly divided into 3 groups:control (CON group:0.9% saline),low-dose of cloprostenol sodium (LPG group:0.1 mg),and high-dose of cloprostenol sodium (HPG group:0.2 mg),farrowing induction were performed on 114 d of gestation via perivulvar injection.The results showed that compared with CON group,the duration was significantly shortened from injection to farrowing both in LPG and HPG gilts (P<0.05),but the difference between the LPG and HPG group was not significant (P>0.05).It was worth noting that,as higher as 95% of gilts started farrowing within 48 hours after injection in LPG group,of which the proportion of daytime farrowing reached up to 75.7%.In addition,the birth interval of gilts in LPG group were significantly shorten than CON group (P<0.05).Meanwhile,it was found that the gilts with backfat thickness in the range of 16-20 mm was significantly shorter the duration from injection to farrowing than that of gilts with backfat thickness ≤15 mm (P<0.05).Moreover,the birth duration and farrowing interval of gilts in the constipation index range from 0-1.0 group were significantly longer than those in the constipation index range 1.1-2.0 and 2.1-3.0 groups (P<0.05).Through regression analysis,it was further found that the backfat thickness of gilts were significantly linearly correlated with the farrowing duration,total born,and number of born alive (P<0.01).Furthermore,constipation index was a significantly linear correlated with farrowing duration,birth interval,total born,and number of born alive (P<0.01).In conclusion,administration of the low-dose cloprostenol sodium for gilts on 114 d of gestation via perivulvar injection was recommended,since it had advantages in shorten the onset of start farrowing without considerable negative effects on gilts and piglets,as well as reducing cost of the active ingredient.In addition,both the backfat thickness and constipation of gilts before farrowing seemed to be factors impact on the effect of synchronized parturition.It was necessary to maintaining moderate (16-20 mm) backfat thickness and avoiding constipation before gilts' farrowing.

Key words: synchronized parturition; primiparous; cloprostenol sodium; backfat thickness; constipation

CLC Number:

S828.9

GAO Hongmei, LIU Yunpeng, ZHANG Longchao, WANG Ligang, ZHAO Fuping, LIU Xin, HOU Xinhua, YAN Hua, WENG Shiqiao, TIAN Jianhui, WANG Lixian. Effects of Cloprostenol Sodium,Antepartum Backfat Thickness and Constipation on Synchronized Parturition in Primiparous[J]. China Animal Husbandry and Veterinary Medicine, 2021, 48(4): 1323-1333.

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Effects of Cloprostenol Sodium,Antepartum Backfat Thickness and Constipation on Synchronized Parturition in Primiparous

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