Biochemical demonstration of malnutrition state in early weaned halfbred zebu calves
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Instituto Nacional de Tecnología Agropecuaria
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The purpose of this study was to demonstrate that early weaning,rather than stress, may induce malnutrition in calves. Sixty out of 120half-bred zebu suckling-calves (60-75 days old) were weaned at day 0and fed with a commercial balanced diet (group E), while the restcontinued suckling (group C). Blood samples were taken on days 0, 7, 14,21, 28, 60, 90 and 120, and sera nutritional indicators were determinedby conventional methods. Comparing the final results of both groups, Cversus E, decreases in sera concentrations (p < 0.05) of albumin (3.39±0.29versus 3.20±0.24 g/dl), urea (0.30±0.04 versus 0.25±0.03 g/l), triglycerides(0.36±0.10 versus 0.21±0.09 g/l), hemoglobin (13.8±1.1 versus 11.7±1.4g/dl), iron (112±17 versus 92±20 ug/dl), copper (80±19 versus 59±20 ug/dl), and weight (158.7±11.7 versus 139.4±11.6 kg) were registered in groupE. Differences between C and E began to be significant from day 7 to 21.Results suggest malnutrition in animals of group E. At the end of theassay, the declining tendency of nutritional indicators tended to revertto normal values. Such changes are attributed to compensatory growth.The absence of a consequential increment in sera urea, triglycerides,hemoglobin and copper concentrations, neither clinical alterations nor deaths, discount the existence of stress in early weaned calves.
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