Estudo da transmissão da imunidade passiva e da mortalidade em cordeiros mestiços de Santa Inês, na região norte de Minas Gerais

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The transferring of passive immunity and the causes of mortality lambs breed and crossbreed Santa Inês were studied this work developed in north of Minas Gerais. The transferring of passive immunity was determined by laboratory and field tests. The main causes of neonatal mortality up to 90 days of age were identified by necropsies. Sixty-nine Santa Inês ewes were monitored at lambing, there were 38 lambs born single and 62 twins. Blood samples were taken from lambs right after lambing (0 hour) and 24 hours later to the evaluation of total protein by refractometry, hematocrit, sodium sulfite turbidity test, and determination of IgG concentration by radial immunodifusion. Colostrum samples were collected from ewes to evaluation of density, by refractometry, and quantification of IgG levels by radial immunodifusion respectively. The rate of neonatal mortality was 27,8% with frequency greater in two first week of life. The main causes of death of lambs up to 90 days of age were pneumonia and the starvation/hypothermia complex. Twins have a greater risk of dying compared to single born lambs. Lambs mortality also increases when ewes are in poor nutritional conditions at the end of gestation. The quality of colostrum was not influenced by the litter size or by the number of gestations the ewes had already had. According to the tests performed in this study the transfer of passive immunity was good. The major elements involved in neonatal losses are ewes underfeeding, mainly when there is a twin gestation, end of gestation, weather variations and inadequate management

ASSUNTO(S)

morte causas teses cordeiro mortalidade teses

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