Abstract
The present study was conducted to investigate the effect of parity number, gestation length, litter size and average piglets’s birthweight on the prolonged farrowing duration (PFD, farrowing duration ≥5h) in sows. Data were collected from 981 sows raised at 17 farms in 6 provinces in the North of Vietnam. Univariate logistic regression models were used to analyze the effect of each single factor on PFD. Factors that had significant effect on PFD with a P value <0.1 was included in the multivariate logistic regression analyses. Results of univariate analyses showed that all of the four mentioned-above factors had significant effects on the PFD in sows. Multivariate analyses, however, revealed that parity number did not significantly influence the PFD in the studied sows. Sows with a gestation length of 113-115 days had a higher odds for PFD than those had a gestation lengh >115 days (OR=2.4, P=0.004). A litter size of 12-15 piglets reduced the risk for PFD in comparison with a litter size >15 piglets (OR=0.38, P=0.001). Also, an average piglets’s birthweight >1.7kg lowered the risk for PFD compared with an average piglets’s birthweight <1.3kg (OR=0.32, P=0.003). This study found that a gestation length of 113-115 days, a litter size >115 piglets and an average piglets’ birthweight <1.3kg are risk factors for PFD in the sows.Nguyen Hoai Nam
FVM- Vietnam National University of Agriculture
Keywords: Sows, time of farrowing, influencing factors Link
Tiếng Việt
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