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Influence of age, dietary protein and weaning on calf abomasal enzymic secretion

Published online by Cambridge University Press:  01 June 2009

P. Garnot ,
R. Toullec ,
J.-L. Thapon ,
P. Martin ,
Minh-Thu Hoang ,
C.-M. Mathieu  and
B. Ribadeau Dumas
P. Garnot
Affiliation:
Laboratoire de Recherches de Technologie Laitière: 65, rue de Saint Brieuc, 35042 Rennes Cédex, France
R. Toullec
Affiliation:
Institut National de la Recherche Agronomique: Laboratoire de Recherches sur les proténes and Laboratoire de Biométrie, 78350 Jouy-en-Josas; Station de Recherches Zootechniques andFrance
J.-L. Thapon
Affiliation:
Institut National de la Recherche Agronomique: Laboratoire de Recherches sur les proténes and Laboratoire de Biométrie, 78350 Jouy-en-Josas; Station de Recherches Zootechniques andFrance
P. Martin
Affiliation:
Institut National de la Recherche Agronomique: Laboratoire de Recherches sur les proténes and Laboratoire de Biométrie, 78350 Jouy-en-Josas; Station de Recherches Zootechniques andFrance
Minh-Thu Hoang
Affiliation:
Institut National de la Recherche Agronomique: Laboratoire de Recherches sur les proténes and Laboratoire de Biométrie, 78350 Jouy-en-Josas; Station de Recherches Zootechniques andFrance
C.-M. Mathieu
Affiliation:
Institut National de la Recherche Agronomique: Laboratoire de Recherches sur les proténes and Laboratoire de Biométrie, 78350 Jouy-en-Josas; Station de Recherches Zootechniques andFrance
B. Ribadeau Dumas
Affiliation:
Institut National de la Recherche Agronomique: Laboratoire de Recherches sur les proténes and Laboratoire de Biométrie, 78350 Jouy-en-Josas; Station de Recherches Zootechniques andFrance
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Summary

Using fistulated calves, the influence of the age, type of dietary protein and weaning on the secretion of chymosin and pepsin by the abomasum were studied. The abomasum secreted both chymosin and pepsin when the animals were fed milk. Chymosin secretion appeared to be independent of the age of the animals, whereas a slow increase in pepsin secretion was observed as the calves aged. Several preruminant animals were fed either a skim-milk diet or a milt substitute in which proteins were provided by fish, soya or whey concentrates. Each of these 3 milk substitutes led to a decrease in chymosin secretion without modification of pepsin secretion. Chymosin secretion was partly restored when the calves were again given a skim-milk diet. At weaning, chymosin secretion dropped abruptly, but the pepsin level was not affected. These results indicate that milk (most probably its casein fraction) is responsible for the activation of chymosin secretion.

Type
Original Articles
Information
Journal of Dairy Research , Volume 44 , Issue 1 , February 1977 , pp. 9 - 23
Copyright
Copyright © Proprietors of Journal of Dairy Research 1977

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