Study on breeding performance of pure breed swines, 2: factors effecting gestation periods of sows
1985
Suthut Siri | Apichai Ratanawaraha | Somjit Boonsukjai (Maejo Inst. of Agricultural Technology, Chiang Mai (Thailand). Office of Agricultural Research and Extension)
The data of 689 litters representing 497 litters of Large While, 149 of Landrace, and 43 of Duroc at Chiang Mai Livestock Breeding Station were studied. It was found that the correlation between the gestation lengths and the litter sizes and weights at birth, and also the averatge birth weights were -0.188, -0.116 and 0.168 respectively. It was found that the breeding, years and season of farrowing had no significant effect on the gestation lengths. The average gestation lengths of Large While, Landrace, and Duroc were 114.39 + 2.38, 113.97 + 2.32, and 115.81 + 1.58 days respectively. But the deam effect was highly significant (p 0.01) as well as the parity, litter sizes, and litter weights at birth also gave the significant effect (P 0.05) on the gestation lengths. However, the effect of the litter weights at birth was not statistically significant
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