Effects of growing and weanning on plasmatic levels of aldosterone, Na+, Ka+ and Cl- in half-bred zebu calves
Variations of plasmatic levels of aldosterone. Na+, K+ and Cl- were registered during the growth (2nd to 6th month) of nursing and early weaned calves, Some reports suggest that small growing rate of calves submitted to early weaning would be due to the stress of mother-breeding separation at 2 mont...
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| Formato: | Artículo revista |
| Lenguaje: | Español |
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Facultad de Ciencias Exactas y Naturales y Agrimensura
2001
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| Acceso en línea: | https://revistas.unne.edu.ar/index.php/fce/article/view/7369 |
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| Sumario: | Variations of plasmatic levels of aldosterone. Na+, K+ and Cl- were registered during the growth (2nd to 6th month) of nursing and early weaned calves, Some reports suggest that small growing rate of calves submitted to early weaning would be due to the stress of mother-breeding separation at 2 months post-partum. Sixty out of 120 suckling half-bred zebú calves (2 months old) were weaned at day 0 receiving a commercial balanced diet, while the remainder continued suckling. Blood samples were taken at 0, 7, 14, 21, 28, 60, 90 and 120 days for laboratory determinations performed by conventional methods. Analysis of the variance for repeated measures demonstrated that differences were not significant for the treatment effect (suckling versus weaned) in any of the studied parameters, The time effect (growth) was significant (p < 0.05) for the decline of aldosterone and Na+ in both lots and was attributed to ontogenic reasons. Such results turn improbable stress occurrence. Confidence intervals for this race and age (2nd and 6th month respectively) were of 346- 352 and 286-292 pg/ml for aldosterone, 141-144 and 140-143 mmol/l for Na+ 4.4-4.6 and 4.4-4.7 mmol/l for K+, as well as 94-98 and 95-98 mmol/l for Cl -. |
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