Document Detail

Effects of the ratio of ruminal propionate to butyrate on milk yield and blood metabolites in dairy cows.
MedLine Citation:
PMID:  8792285     Owner:  NLM     Status:  MEDLINE    
Four Ayrshire cows (mean = 56 DIM) were used in a 4 x 4 Latin square design to study the effects of the ratio of propionate to butyrate in the rumen on milk yield, milk composition, and blood metabolites. The cows were fed a basal diet (16.2% CP, 43.4% NDF) consisting of 50% grass silage, 6% grass hay, and 44% concentrate (percentage of DM). The diet supplied 44 Mcal/d of metabolizable energy and was supplemented with isoenergetic infusions of VFA (4.5 Mcal/d). Propionate (900 g/d) was replaced gradually with 33, 67, and 100% of butyrate on an energy basis. Replacement of propionate with butyrate in the infusate decreased propionate and increased butyrate concentrations in ruminal fluid and in blood plasma. Yields of milk and lactose decreased, and yield of milk fat increased, as butyrate increased. Milk fat content increased, and lactose content decreased, as butyrate increased. Increased ruminal supply of butyrate decreased plasma glucose concentration and increased blood ketone body concentration. When only butyrate was infused (750 g/d), either liver metabolism was changed or tissue mobilization was increased, as indicated by the increased production of long-chain milk fatty acids and increased plasma concentrations of acetate, Gly, and branched-chain AA. An increase in ruminal butyrate supply at the expense of propionate adversely affected milk yield and the repartitioning of nutrients between milk components. At a high percentage, increased butyrate might also adversely affect the overall metabolism of the cow.
H Miettinen; P Huhtanen
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of dairy science     Volume:  79     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  1996 May 
Date Detail:
Created Date:  1996-11-08     Completed Date:  1996-11-08     Revised Date:  2005-11-17    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  851-61     Citation Subset:  IM    
Valio Ltd., Farm Services, Helsinki, Finland.
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MeSH Terms
3-Hydroxybutyric Acid
Acetoacetates / blood
Amino Acids, Branched-Chain / blood
Animal Feed
Blood Glucose / metabolism
Butyric Acid
Butyric Acids / administration & dosage,  metabolism*
Cattle / physiology*
Fatty Acids, Volatile / administration & dosage
Hydroxybutyrates / blood
Ketone Bodies / blood
Lactation / physiology*
Lactose / metabolism
Lipid Metabolism
Milk / metabolism
Propionic Acids / administration & dosage,  metabolism*
Rumen / chemistry,  metabolism*
Reg. No./Substance:
0/Acetoacetates; 0/Amino Acids, Branched-Chain; 0/Blood Glucose; 0/Butyric Acids; 0/Fatty Acids, Volatile; 0/Hydroxybutyrates; 0/Ketone Bodies; 0/Propionic Acids; 107-92-6/Butyric Acid; 300-85-6/3-Hydroxybutyric Acid; 541-50-4/acetoacetic acid; 63-42-3/Lactose; 79-09-4/propionic acid

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

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