Summary. Premature farrowing in the sow and significance of piglet birth weight. fig. 3) when pregnancy lasted less than 112 days (2.53 and 1.45 per litter for herds I and II). Survival rate was minimum for animals born before 111 days (table 3).At 35 days, less than 2 animals remained out of 3 born alive in the following weight classes of herd I : less 900 g, less than 1 000 g for those born before 117 days, and less than 1 100 g up to 112 days. In herd II, only animals weighing less than 900 g born before 117 days and those weighing less than 1 000 g before 113 days were truly premature. Prematurity seemed to vary in swine not only with the duration of gestation and with birth weight, but also with managemental and environmental (nutrition, microclimate, quality and intensity of care at birth) conditions. Introduction.

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