Abstract
The effects of year and season of birth and farrowing order on litter size and litter weight at 21 days of age were studied for 529 litters of Duroc swine raised at Estacao Experimental de Zootecnia, Sertaozinho, SP, from 1957 to 1970. The mean number of piglets per litter was 5.59 and mean litter weight was25.63 kg. Sow age at farrowing was found to be an important cause of variations in the traits studied. The highest means occurred in general at 34-39 months of sow’s age or at the fourth –fifth farrowing.
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