02981nab a2200325 a 4500003000900000005001700009008004100026041001300067100003400080245009100114264000900205300001600214520203400230650001902264650002902283650002302312650001602335650003202351650001702383650002502400650002302425650002502448650003402473773006202507942000802569035001702577001000702594999001902601040003502620AR-ReUNN20260702002259.0260630s2007    ag |||||||||||||||||spa  0 aspaaeng1 aCoppo, José Antonio911792410aMultivariate analysis about causes of growth delay in early weaned calves / J.A. Coppo 1c2007  a9 páginas  aAbstract:  The purpose of this trial was to check if early weaned calf growth delay is due to stress or inadequate feeding. In 4 successive years, assays of 120 days each were carried out, using in total 120 half-bred Zebu calves (2 months old) grazed on natural pasture. Sixty animals were controls fed on maternal milk (C), and other 60 made up the experimental group (E), which was submitted to early weaning and supplemented with balanced food. Weightings and blood extractions were made in days 0, 7, 14, 21, 28, 60, 90 and 120. Hematological and biochemical determinations (42 parameters) included stress and malnutrition indicators, which were evaluated by radio-immune-assay, chemoluminiscency, spectrophotometry, electrophoresis, and electronic particle recount. Such procedures generated more than 40,000 data, which were statistically processed by multivariate techniques, to eliminate the additive effect of random intervention probability (alpha error), characteristic from univariate methods that comprise numerous dependent variables. Variables that obtained significant differences for treatment and/or time effects in repeated measures univariate techniques, were selected for analysis of principal components. Four orthogonal supervariables, susceptible to stress, malnutrition and ontogeny, were created. Weight gains were 79.9 kg (666 g/animal/day) in C, and 61.6 kg (513 g/animal/day) in E. Variations of cortisol, aldosterone, fructosamine, glucose, sodium, potassium, leukocytes, gamma globulins and enzymes suggested absence of stress, examined under an ontogenic frame. On the other hand, decrease of protein, carbohydrate, lipid, and mineral nutritional indicators, revealed malnutrition in E. Selected principal components indicated that most of total variance was due to malnutrition and ontogeny, but not to stress. It is important to develop more appropriate balanced supplements for early weaned calves.Key words: half-bred Zebu calf, liveweight gain, biochemical alterations, stress, malnutrition. 4aTernero965768 4aGanancia de Peso9122983 4aCruzamiento961275 4aCebu962637 4aMedicina Veterinaria919512 4aEstres99129 4aAlteraciones9116820 4aCrecimiento910886 4aDesnutrición91737 4aRespuesta Fisiologica91165830 tRevista Veterinariax1668-4834gv. 18 n. 1 (2007)w217547  cART  a(AGROP)40868217577  c217577d217577  aAR-ReUNNbspacAR-ReUNNeaacr2