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Journal of Dairy Science Vol. 57 No. 10 1196-1200
© 1974 by American Dairy Science Association ®
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Blood Glucose and Fructose in the Newborn Ruminant1

L. B. Daniels, J. L. Perkins, D. Krieder, D. Tugwell and D. Carpenter

Department of Animal Sciences, Unviversity of Arkansas, Fayetteville 72701

ABSTRACT

Concentrations of blood glucose and fructose were studied in 8 calves and 20 lambs. Calves wer removed from their dams immediately following birth. Jugular blood samples were taken 3 min after birth and at 30 min intervals until calves were 6 h of age and then at 1 h intervals until 24 h of age. Calves were fed 1 kg of their dam's colostrum at 6, 12, and 18 h of age. Rectal temperatures were recorded at the same intervals as blood samples were taken. Jugular blood samples were taken lambs within 3 min after birth and at 2, 4, 6, 8, and 24 h of age. Lambs were allowed to nurse their dams after the initial blood sample. Blood glucose averaged 62 mg/100 mla and fructose 52 mg/100 ml in calves at birth while lambs had 13 mg/100 ml glucose and 46 mg/100 ml fructose at birth. Blood glucose and fructose decreased rapidly during the first few hours of life in calves. Feeding colostrum to calves did not give a uniform rise in blood glucose. Peak blood glucose occurred after the second feeding of colostrum. Body temperature remained normal throughout the 24 h. Lambs exhibited low blood glucose through the first 24 h of life. Blood fructose concentrations in lambs were similar to those of calves. Newborn neonatal ruminants may not be dependent upon glucose as their principle energy substrate during the first 24 h of life.

FOOTNOTES

1 This paper is submitted with the approval of the Director of the Arkansas Experiment Station.






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Copyright © 1974 by the American Dairy Science Association ®.