000			02930nab a2200313 a 4500
003			AR-ReUNN
005			20260702002259.0
008			260630s2007 ag |||||||||||||||||spa
041	0		_aspa _aeng
100	1		_aCoppo, José Antonio _9117924
245	1	0	_aMultivariate analysis about causes of growth delay in early weaned calves / J.A. Coppo
264		1	_c2007
300			_a9 páginas
520			_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.
650		4	_aTernero _965768
650		4	_aGanancia de Peso _9122983
650		4	_aCruzamiento _961275
650		4	_aCebu _962637
650		4	_aMedicina Veterinaria _919512
650		4	_aEstres _99129
650		4	_aAlteraciones _9116820
650		4	_aCrecimiento _910886
650		4	_aDesnutrición _91737
650		4	_aRespuesta Fisiologica _9116583
773	0		_tRevista Veterinaria _x1668-4834 _gv. 18 n. 1 (2007) _w217547
942			_cART
035			_a(AGROP)40868
001			217577
999			_c217577 _d217577
040			_aAR-ReUNN _bspa _cAR-ReUNN _eaacr2