Effects of growing and weanning on plasmatic levels of aldosterone, Na+, Ka+ and Cl- in half-bred zebu calves
DOI:
https://doi.org/10.30972/fac.1717369Keywords:
Aldosterone, Electrolytes, Calf, Growing, Weaning, StressAbstract
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 -.
References
Bensi, N., M. Bertuzzi, A. Armario and H.F. Gauna, 1997. Chronic immobilization reduces sodium inlake and renal excretion in rats. Physiol. Behav., 62: 1391-1396.
Capponi, A.M. and M.F. Rossier, 1996. Regulation of aldosterone secretion. Can. Opin. Endocr. Diab., 3: 248-257.
Carcargno, A.R., 1995. Corteza adrenal. In: Fisiología Veterinaria (A. García Sacristán, ed.). Interamericana, Madrid. 1074 p.
Carrizo, T. and J. Morales, 1990. Influencia de los medicamentos en el resultado de los análisis clínicos. Acta Bioq. Clin. Latín,, 24, 345-352.
Castaño, B.H., 1995. Control y regulación de la temperatura corporal. In: Fisiología Veterinaria (A. García Sacristán, ed.). Interamericana, Madrid. 1074 p.
Cirio, A. and I. Tebot, 2000. Fisiología Metabólica de los Rumiantes. Ed. CSIC, Universidad de la República, Montevideo. 146 p.
Coles, E.H., 1986. Veterinary Clinical Pathology. Saunders, Phitadelphia. 486 p.
Coppo, J.A., 2001. Fisiología Comparada del Medio Interno. Ed. Dunken, Buenos Aires. 303 p.
Coppo, J.A. and N.B. Coppo, 1999. Desnutrición del ganado como secuela de las inundaciones de 1998. Vet.Arg., 16: 581-587.
Coppo, J.A., N.B. Coppo and A.L. Slanac, 1996. Ontogenia del medio interno en terneros lactantes cruza cebú. Actas Ciencia & Técn. UNNE, 2: 99-101.
Coppo, J.A., N.B. Coppo, A.L. Slanac, M.A. Revidáto and A. Capellari, 1999. Valores de cortisol en vacas precozmente destetadas. Actas Ciencia & Técn. UNNE, 4: 125-128.
Corbellini, C.N., 1998. Influencia de los micronutrientes en la fertilidad de bovinos lecheros. Rev. Med. Vet, 79: 8-13.
Dickson, W.M., 1999. Glándulas endocrinas. In: M.J. Swenson and W.O. Reece (eds.): Fisiología de los Animales Domésticos de Dukes. UTEHA, México. 925 p.
Dürr, U.M. and W. Kraft, 1980. Laboratory Testing in Veterinary Medicine. Boehringer Ed., Munich. 130 p.
Füller, P.J. and S. Lin-Tio, 1996. Aldosterone action, sodium channels and inherited disease. J. Endocrino148: 387-390.
Galli, 1.0., A.R. Monje and C.C. Hofer, 1995. Destete Precoz. Fd. Instituto Nacional de Tecnología Agropecuaria INTA, Buenos Aires. 33 p.
Gascón, P.M., 1992. Electroforesis de proteínas séricas. In: J. Gómez Piquer (ed.): Manual Práctico de Análisis Clínicos en Veterinaria. Mira Editores, Zaragoza. 445 p.
Gauna, H.F., H. Agnelli, M. Lattanzi, D. Bueno and A.L. Cabral., 1994. Cardiovascular effeets in the post-stress period on rats with low sodium intake. Comun. Biol., 12: 293-295.
Guyton, A.C. and J.E. Hall, 1998. Fisiología y Fisiopatología. McGraw 1 lili, México. 729 p.
Henry, J.B.. H.G. Preuss and S.J. Podlasek, 1991. Evaluation of renal function. In: J.B. Henry (ed.): Clinical Diagnosis and Management by Laboratory Methods. Saunders, Philadelphia. 1509 p.
Jain, N.C., 1993. Essentials o/Veterinary Hematology. Lea & Febiger, Philadelphia. 417 p.
Koepke, J., S. Jones and G. Dibona, 1986. Renal nerve activity and renal fuction during environmental stress in DOCA-NaCl rats. Am. J. Physiol.. 251: 289-294.
Niebylski, A., M. Bertuzzi, N. Bensi, A. Armario and H.F. Gauna, 2000. Renal excretion and saline intake during post-stress immobilization period in rats. Arch. Physiol. Biochem., 108: 268-274.
Nockels, C.F., 1992. Alteraciones minerales asociadas con el estrés, traumas e infección y su electo sobre la inrnuniodad. Therios, 19: 344-353.
Steel, R.G. and J.H. Torrie, 1992. Principles and Procedures of Statistics. A Biometrical Approach. McGraw-Hill, New York. 357 p.
Tasker, J.B.. 1989. Fluids, electrolytes, and acid-base balance. In: J.J. Kaneko (ed.): Clinical Biochemistry of Domestic Animal. Academic Press, San Diego. 832 p.
West, J.W., 1993. Estrés calórico. Alimentación y manejo para reducir sus efectos en vacas holando. Vet. Arg., 10:478-485.
