Document Detail

Effects of degree of fat saturation on fiber digestion and microbial protein synthesis when diets are fed twelve times daily.
MedLine Citation:
PMID:  10985417     Owner:  NLM     Status:  MEDLINE    
Three Holstein heifers and one nonlactating cow, fitted with ruminal and duodenal cannulas, were arranged in a 4 x 4 Latin square design to determine the effects of degree of fat saturation on ruminal neutral detergent fiber digestion and microbial protein synthesis and to determine whether changes in the efficiency of microbial protein synthesis were related to protozoal populations in the rumen. Corn silage-based diets contained no added fat or 4.85% of diet dry matter as partially hydrogenated tallow, tallow, or animal-vegetable fat. Iodine values of fat sources were 12.8, 50.6, and 109.7 for partially hydrogenated tallow, tallow, and animal-vegetable fat, respectively. Cattle were fed every 2 h and consumed 1.5% of body weight as dry matter daily. Ruminal neutral detergent fiber digestibility was decreased by added fat but was not affected by increasing iodine value. Flows of microbial N and non-NH3-nonmicrobial N to the duodenum were not affected by treatment. Ruminal protozoa concentration decreased linearly as the iodine value of fats increased. The efficiency of microbial protein synthesis was increased and protozoa concentrations tended to decrease when fat was fed. Decreased ruminal protozoa concentration may have decreased intraruminal N recycling. Biohydrogenation of added fat may result in a low ruminal concentration of unsaturated fatty acids when cows are fed frequently, reducing the negative effects of unsaturated fat sources on ruminal neutral detergent fiber digestibility. Protozoa were inhibited by unsaturated fat, but it is not clear if biohydrogenation and frequent feeding lessened inhibition.
B S Oldick; J L Firkins
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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 animal science     Volume:  78     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2000 Sep 
Date Detail:
Created Date:  2000-12-19     Completed Date:  2000-12-19     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2412-20     Citation Subset:  IM    
Department of Animal Sciences, The Ohio State University, Columbus 43210, USA.
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MeSH Terms
Animal Feed
Bacterial Proteins / biosynthesis*
Cattle / metabolism*
Dietary Fats / pharmacology*
Dietary Fiber / administration & dosage,  metabolism*
Dietary Supplements
Eukaryota / drug effects
Fatty Acids, Unsaturated / metabolism*
Rumen / metabolism*,  parasitology
Reg. No./Substance:
0/Bacterial Proteins; 0/Dietary Fats; 0/Fatty Acids, Unsaturated

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