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Journal of Dairy Science Vol. 53 No. 1 72-78
© 1970 by American Dairy Science Association ®
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Pancreatic Amylase Secretion by Young Calves1

J. L. Morrill, W. E. Stewart2, R. J. McCormick3 and H. C. Fryer

Department of Dairy and Poultry Science, Kansas State University, Manhattan 66502
Department of Dairy Science, University of Maryland, College Park 20742
and Department of Statistics and Computer Science, Kansas State University, Manhattan

ABSTRACT

Pancreatic juice samples, collected from male dairy calves fitted with pancreatic duct cannulae, were analyzed for amylase. In one experiment calves were fed milk or milk replacer, hay and calf starter to eight weeks of age, then hay and calf starter. Samples were collected at different intervals after feeding, at various times during day and night, and at various ages to 163 days. In another experiment, the effect of protein source was studied in calves to 21 days of age.

The pancreatic juice amylase concentrations varied widely, with no significant trend related to time of day or time after feeding, but with an increase with increase in age. Pancreatic juice flow rates increased with age and were highest at six hours after feeding. Amylase concentrations and flow rates were higher for calves fed diets in which all of the protein was from milk than for calves fed some soybean protein. Based on an enzyme reaction time of 20 minutes, the amount of reducing activity, expressed as grams of glucose formed from soluble starch per 24 hours, was always less than 12 for calves up to 100 days of age and ranged to 220 for a 163-day-old calf.

FOOTNOTES

1 Contribution no. 673, Department of Dairy and Poultry Science, Contribution no. 120, Department of Statistics and Computer Science, Kansas Agricultural Experiment Station, Manhattan: Scientific Article no. A-1352, Contribution no. 3925 of the Maryland Agricultural Experiment Station, College Park.

2 Present address: Hubris Heart Research, Inc., P.O. Box 783, Port Worth, Texas 76101.

3 Present address: Biology Department, Eocky Mountain College, Billings, Montana 59101.






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