Document Detail

Effect of once daily milking and concurrent somatotropin on mammary tight junction permeability and yield of cows.
MedLine Citation:
PMID:  7836586     Owner:  NLM     Status:  MEDLINE    
Six pairs of monozygous Friesian twin cows during late lactation were used to assess the effect of once daily milking and bST treatment on yields and tight junction permeability of mammary epithelial cells. During the first 7 d, all cows were milked twice daily; on d 8 through d 21, all cows were milked once daily, but one cow of each twin pair was treated daily with 20 mg of bST on d 13 through 21; and, finally, during d 22 through 28, all cows were again milked twice daily. Once daily milking, a common management practice in New Zealand, resulted in a small (7%) but significant decrease in milk yield. Treatment with bST increased milk yield by 19%, thereby exceeding the milk yield loss from once daily milking. The integrity of mammary tight junctions was assessed indirectly by measuring concentrations of plasma lactose and milk BSA. Once daily milking temporarily disrupted tight junction integrity, based on a 4- to 5-fold increase in plasma lactose and a 42 to 55% increase in the concentrations of milk BSA. In the present study, bST did not affect the permeability of mammary tight junctions.
K Stelwagen; S R Davis; V C Farr; S J Eichler; I Politis
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Publication Detail:
Type:  Clinical Trial; Controlled Clinical Trial; Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  77     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1994 Oct 
Date Detail:
Created Date:  1995-03-01     Completed Date:  1995-03-01     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2994-3001     Citation Subset:  IM    
Dairying Research Corporation Ltd., Ruakura Agricultural Centre, Hamilton, New Zealand.
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MeSH Terms
Dairying / methods*
Enzyme-Linked Immunosorbent Assay
Growth Hormone / pharmacology*
Intercellular Junctions / drug effects*
Lactation / drug effects,  physiology*
Lactose / blood
Mammary Glands, Animal / drug effects,  physiology*,  ultrastructure
Time Factors
Twins, Monozygotic
Reg. No./Substance:
63-42-3/Lactose; 9002-72-6/Growth Hormone

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

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