Document Detail

Effects of source of protein and carbohydrate on ruminal fermentation and passage of nutrients to the small intestine of lactating cows.
MedLine Citation:
PMID:  2794168     Owner:  NLM     Status:  MEDLINE    
Four early lactation multiparous Holstein cows were used in a 4 x 4 Latin square to investigate the effects of source of protein (fish meal or soybean meal) and carbohydrate (corn or barley) on ruminal fermentation, flow of nutrients to the small intestine, and animal performance. The treatments, arranged in a 2 x 2 (protein x carbohydrate) factorial were: 1) corn plus soybean meal; 2) corn plus fish meal; 3) barley plus soybean meal; and 4) barley plus fish meal. Dry matter and starch intakes were greater when corn was fed than when barley was fed. Barley-based diets were more extensively degraded in the rumen than corn-based diets and therefore provided more energy for microbial growth. However, passage of amino acids and starch to the duodenum was greater for corn-based diets than barley-based diets, because of the greater intake and lower ruminal degradability of the corn-based diets. Microbial protein constituted a larger portion of the total N and had a greater influence on the pattern and quantity of amino acids that passed to the duodenum than did protein from fish meal or soybean meal, which escaped ruminal degradation. Feeding corn-based diets increased production of milk and milk protein compared with feeding barley-based diets.
R D McCarthy; T H Klusmeyer; J L Vicini; J H Clark; D R Nelson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of dairy science     Volume:  72     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1989 Aug 
Date Detail:
Created Date:  1989-11-16     Completed Date:  1989-11-16     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:  2002-16     Citation Subset:  IM    
Department of Animal Sciences, University of Illinois, Urbana 61801.
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MeSH Terms
Cattle / metabolism*
Dietary Carbohydrates / metabolism*
Dietary Proteins / metabolism*
Duodenum / metabolism
Fish Flour / analysis
Gastrointestinal Transit*
Hordeum / metabolism
Rumen / metabolism*
Soybeans / metabolism
Zea mays / metabolism
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Dietary Proteins

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