Changes in Blood Glucose, Nonesterified Fatty Acids, and Ketones in Response to Weaning and Feed Intake in Young Calves

Effects of weaning age on blood glucose, ketones, and nonesterifid fatty acids were examined using 16 Holstein heifer calves. Animals entered the study at 6±3.5 d of age and were fed 1.8kg of milk twice daily to 28 (early weaning) or 56 d (late weaning) and a commercial pelleted calf starter from 0...

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Bibliographic Details
Published in:Journal of dairy science 1991-01, Vol.74 (1), p.250-257
Main Authors: Quigley, J.D., Caldwell, L.A., Sinks, G.D., Heitmann, R.N.
Format: Article
Language:English
Subjects:
3-Hydroxybutyric Acid
Acetoacetates - blood
ACIDE GRAS
ACIDOS GRASOS
AGE
Animal Feed
Animals
Biological and medical sciences
Blood Glucose - metabolism
calves
Cattle - blood
CETONAS
CETONE
DESTETE
Eating - physiology
EDAD
Fatty Acids, Nonesterified - blood
Feed and pet food industries
Female
Food industries
Fundamental and applied biological sciences. Psychology
GAIN DE POIDS
GANANCIA DE PESO
GLICEMIA
GLYCEMIE
Hydroxybutyrates - blood
INGESTION DE PIENSO
Ketone Bodies - blood
ketones
Least-Squares Analysis
METABOLITE
METABOLITOS
PLASMA SANGUIN
PLASMA SANGUINEO
PRISE ALIMENTAIRE (ANIMAUX)
Random Allocation
RUMEN
ruminal development
SEVRAGE
TERNERO
VEAU
Weaning
Weight Gain
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Summary:Effects of weaning age on blood glucose, ketones, and nonesterifid fatty acids were examined using 16 Holstein heifer calves. Animals entered the study at 6±3.5 d of age and were fed 1.8kg of milk twice daily to 28 (early weaning) or 56 d (late weaning) and a commercial pelleted calf starter from 0 (early) or 28 d (late). Blood was sampled once weekly for 14wk and analyzed for β-hydroxybutyrate and acetoacetate. Plasma was analyzed for glucose and nonesterifid fatty acids. Blood β-hydroxybutyrate increased with increasing grain intake and was greater during wk 0 to 4 and 5 to 8 in calves weaned early than in those weaned late. Blood acetoacetate followed trends similar to β-hydroxybutyrate and averaged 23.8 and 16.1 μM in calves weaned early and late, respectively. Plasma glucose and nonesterifid fatty acids declined with age and were lower during 5 to 8wk in calves weaned early. Data suggest that ketone concentrations resulted from alimentary ketogenesis, which increased rapidly after weaning.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(91)78167-8