Birth records of 3032 piglets of the Large White breed, born during the period between 1984 and 1987 were sent for analyses by the Associação Brasileira de Criadores de Suínos. The data used came from a commercial farm in the state of Rio Grande do Sul, Brazil. Natal mortality and mortality of piglets up to 21 days of age were determined in different season condition during three years of analysis. The effect of season on there parameters was significative. The larger number of stillbirths was observed in the spring (0.50 piglets) and fall (0.47 piglets) seasons. The higher percentage of preweaning mortality was observed in the winter (1.96 piglets/offsping) and in the summer (1.79 piglets/offspring) seasons.
piglets; season; natal mortality; mortality
