Renal Corticopapillary Concentration Gradient in Calves

Renal kortikopapillär koncentrationsgraaient hos kalvar

Abstract

From 31 calves samples were taken from blood, urine and kidneys in a slaughterhouse. The calves were divided into three age groups: A. Newborn calves, B. Grazing calves, C. Bulls and heifers. The renal cortical and papillary potassium concentrations were higher in younger than in older calves. The corticopapillary urea and sodium concentration gradients during antidiuresis give good information about renal concentrating ability. The urea gradient was fully developed in the newborn calves. The sodium gradient, however, showed a small, but statistically significant difference between the age groups. Thus the papillary sodium content was lower in the newborn calves than in the older animals while the cortical sodium concentration was higher in the newborn and in the grazing calves than in bulls and heifers. Compared to the neonatal rat and rabbit the newborn calf has a high, but not fully developed corticopapillary concentration gradient.

Sammanfattning

Prov togs från 31 kalvar av blod, urin och njurar i ett slakthus. Kalvarna delades i tre åldersgrupper: A. Nyfödda kalvar, B. Mellan-, kalvar, G. Tjur och kvigor. Kaliumkoncentrationen i njurbarken och papillan var högre hos de unga kalvarna än hos tjurarna och kvigorna. Den kortikopapillär a urinämne- och natriumkoncentrations-gradienten i antidiures ger god information om njurarnas förmåga att utsöndra koncentrerad urin. Urinämnesgradienten var fullt utvecklad hos de nyfödda kalvarna. Natrium gradienten däremot visade en liten men statistiskt signifikant skillnad mellan åldersgrupperna. Natriumkoncentrationen i papillan var hos de nyfödda kalvarna lägre än hos de äldre djuren, medan den i njurbarken hos de yngre kalvarna var högre än hos tjurar och kvigor. Jämfört med den nyfödda råttan och kaninen har kalven genast efter födelsen en hög, om än ej fullt utvecklad kortikopapillär koncentrationsgradient.

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Acknowledgments

The author wishes to thank Professor M. J. Karvonen for advice and helpfull discussions and Mrs. A. Johansson for skilled technical assistance.

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Correspondence to Lea Eriksson.

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Eriksson, L. Renal Corticopapillary Concentration Gradient in Calves. Acta Vet Scand 13, 197–205 (1972). https://doi.org/10.1186/BF03548573

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