Document Detail

Lack of response to addition of degradable protein to a low protein diet fed to midlactation dairy cows.
MedLine Citation:
PMID:  8132882     Owner:  NLM     Status:  MEDLINE    
Midlactation Holstein cows (n = 24, 12 primiparous) were subjected to four dietary treatments arranged in six Latin squares. Cows were assigned to squares according to parity and previous production within parity. Diets contained 53 to 55% DM from corn silage, and the remaining DM was from concentrates. The basal diet contained 13.9% CP with 9.5% rumen-degraded and 4.4% undegraded intake protein. Three other treatments were formulated to give one diet with more degradable true protein than the basal (11.9% degraded intake protein, 4.3% undegraded intake protein); another with urea added to the basal (12.2% degraded intake protein, 4.5% undegraded intake protein); and a third with additional undegraded protein added to the basal (8.3% degraded intake protein, 7.2% undegraded intake protein). Milk fat and protein concentration were unaffected by diet in all squares. Only the highest producing cows responded significantly to increased undegraded intake protein; milk production was 30.8, 30.9, 31.6, and 33.2 kg/d for basal, added degradable true protein, added urea, and added undegraded protein, respectively. Corresponding protein productions were 913, 929, 927, and 1004 g/d for these cows. Neither degradable true protein nor degradable N increased milk production in the highest producing cows, suggesting that microbial protein production was not limited by the amount of degradable protein in the basal diet. For midlactation, multiparous, and primiparous cows producing < 30 and 25 kg of milk/d, respectively, the protein content of the basal ration appeared to be adequate.
L E Armentano; S J Bertics; J Riesterer
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  76     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1993 Dec 
Date Detail:
Created Date:  1994-04-21     Completed Date:  1994-04-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  3755-62     Citation Subset:  IM    
Department of Dairy Science, University of Wisconsin, Madison 53706.
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MeSH Terms
Cattle / physiology*
Dietary Proteins / administration & dosage*
Lactation / physiology*
Lipids / analysis
Milk / chemistry
Milk Proteins / metabolism
Rumen / metabolism,  microbiology
Zea mays
Reg. No./Substance:
0/Dietary Proteins; 0/Lipids; 0/Milk Proteins

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