Integration of perinatal events, pathophysiological changes and consequences for the newborn lamb
Fetal hypoxaemia caused by placental insufficiency or birth difficulties, if it does not kill the fetus, inhibits heat production sufficiently to cause hypothermia after birth. Maternal underfeeding during late pregnancy impedes the deposition of body energy reserves in the fetus and thereby makes the newborn more dependent on early intakes of colostrum, but colostrum is likely to be difficult to obtain because underfed ewes produce less of it and may also exhibit poor maternal care. Inadequate colostrum intakes by newborn lambs, whether or not they are from underfed ewes, cause hypothermia as their body energy reserves become depleted and also increase the lambs' susceptibility to infections because of inadequate supplies of colostral antibodies. Premature birth can be caused by placental insufficiency, maternal underfeeding, maternal stress or other factors, and is often, although not invariably, associated with degrees of immaturity which prove fatal. These recent advances in understanding of the physiology and pathophysiology of the periparturient period have resulted in two practical benefits: 1. Improved methods for diagnosing the causes of lamb death; 2. Cost-effective and straightforward lambing management strategies which reduce neonatal losses
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| Format: | biblioteca |
| Published: |
1988
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| Subjects: | OVINOS, CORDERO, REPRODUCCION, GESTACION, PARTO, TERMORREGULACION, FISIOLOGIA, |
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| Summary: | Fetal hypoxaemia caused by placental insufficiency or birth difficulties, if it does not kill the fetus, inhibits heat production sufficiently to cause hypothermia after birth. Maternal underfeeding during late pregnancy impedes the deposition of body energy reserves in the fetus and thereby makes the newborn more dependent on early intakes of colostrum, but colostrum is likely to be difficult to obtain because underfed ewes produce less of it and may also exhibit poor maternal care. Inadequate colostrum intakes by newborn lambs, whether or not they are from underfed ewes, cause hypothermia as their body energy reserves become depleted and also increase the lambs' susceptibility to infections because of inadequate supplies of colostral antibodies. Premature birth can be caused by placental insufficiency, maternal underfeeding, maternal stress or other factors, and is often, although not invariably, associated with degrees of immaturity which prove fatal. These recent advances in understanding of the physiology and pathophysiology of the periparturient period have resulted in two practical benefits: 1. Improved methods for diagnosing the causes of lamb death; 2. Cost-effective and straightforward lambing management strategies which reduce neonatal losses |
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