Document Detail

Nonstructural carbohydrate and undegradable protein sources in the diet: growth responses of dairy heifers.
MedLine Citation:
PMID:  7814729     Owner:  NLM     Status:  MEDLINE    
Thirty-five 3-mo-old 150-kg Holstein heifers were fed diets containing two nonstructural carbohydrate sources (corn or barley) with two quantities of undegradable protein (soybean meal or extruded soybean meal) for 9 wk in a 2 x 2 factorial arrangement to evaluate NRC guidelines that the diet contain increased quantities of undegraded intake protein. Total mixed diets fed for ad libitum intake contained approximately 17.4% CP, consisting of 16.7% corn silage (DM basis), 33.3% chopped alfalfa hay, and 50% concentrate mix. Average daily gains were greater for heifers fed extruded soybean meal, but response was greater when heifers were fed barley-extruded soybean meal (1.12, 1.13, 1.05, and 1.23 kg/d for corn-soybean meal, corn-extruded soybean meal, barley-soybean meal, and barley-extruded soybean meal, respectively) than diets of barley-soybean meal. Extruded soybean meal increased DMI (5.9, 6.1, 5.2, and 6.7 kg/d), but DMI were similar when diets based on corn or barley were fed. Diets with greater concentrations of undegraded intake protein fed to dairy heifers resulted in greater DMI and average daily gains, but responses were greater when heifers were fed diets based on barley rather than corn. These results suggest that current NRC recommendations for undegraded intake protein fed to 3- to 6-mo-old dairy heifers are too high; diets containing 35 to 40% undegraded intake protein should be sufficient.
D P Casper; D J Schingoethe; M J Brouk; H A Maiga
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  77     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1994 Sep 
Date Detail:
Created Date:  1995-02-09     Completed Date:  1995-02-09     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:  2595-604     Citation Subset:  IM    
Energy Metabolism Unit, Livestock and Poultry Sciences Institute, Beltsville Agricultural Research Center-East USDA-ARS, MD 20705.
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MeSH Terms
Animal Feed*
Cattle / growth & development*
Dietary Carbohydrates / administration & dosage*
Dietary Proteins / administration & dosage*
Medicago sativa
Weight Gain
Zea mays
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Dietary Proteins

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

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