Document Detail

Effect of enhancing curd formation during the first colostrum feed on absorption of gamma glutamyl transferase by newborn calves.
MedLine Citation:
PMID:  15086094     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To examine the effects of curd formation within the abomasum, on the absorption of gamma glutamyl transferase (GGT) from colostrum in newborn calves. DESIGN: An in vivo physiological study with controls, and in vitro examination of calf abomasal fluid. PROCEDURES: Newborn calves were taken from cows without allowing them to suckle. They were fed either 1.5 kg colostrum or 1.5 kg colostrum plus rennet, with intervals between calving and colostrum feeding ranging from 0.4 to 12.7 h. Absorption of proteins from the whey component of colostrum was assessed from the rise in activity of serum GGT. In in vitro studies, colostrum was incubated with bovine amniotic fluid, newborn calf abomasal fluid or newborn calf forestomach contents, with or without rennet, to test the curd inhibiting effects of components in the abomasal fluid of newborn calves. RESULTS: In vivo: addition of rennet to the colostrum feed reduced the proportion of calves with serum GGT activity below 500 U/L by 60%. In vitro: 43% of newborn calves lacked curd forming activity in their abomasal fluid, and that deficiency was corrected by adding rennet to the incubation medium. CONCLUSIONS: Some calves are born with low amounts of curd forming enzyme activity in the abomasum. This may compromise their ability to absorb large whey proteins from the first feed of colostrum. Adding rennet to the first colostrum feed may improve passive immunity in those calves.
N G Gregory
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Australian veterinary journal     Volume:  81     ISSN:  0005-0423     ISO Abbreviation:  Aust. Vet. J.     Publication Date:  2003 Sep 
Date Detail:
Created Date:  2004-04-16     Completed Date:  2004-05-11     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370616     Medline TA:  Aust Vet J     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  549-52     Citation Subset:  IM    
SARDI, Flaxley Agricultural Centre, Strathalbyn Road, PO Box 1571, Flaxley, South Australia 5153.
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MeSH Terms
Abomasum / enzymology,  metabolism
Animal Feed
Animals, Newborn / immunology,  metabolism*
Cattle / immunology,  metabolism*
Chymosin / pharmacology*
Colostrum / enzymology,  metabolism*
Immunity, Maternally-Acquired
gamma-Glutamyltransferase / administration & dosage,  pharmacokinetics*
Reg. No./Substance:
9042-08-4/rennet; EC; EC

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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