Dietary energy source in dairy cows in early lactation: energy partitioning and milk composition.

Dietary energy source in dairy cows in early lactation: energy partitioning and milk composition. Research Abstract Details 

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Dietary energy source in dairy cows in early lactation: energy partitioning and milk composition. Abstract Text:

A T M van Knegsel,H van den Brand,J Dijkstra,W M van Straalen,M J W Heetkamp,S Tamminga,B Kemp,

Metabolic problems related to negative energy balance suggest a role for the balance in supply of lipogenic and glucogenic nutrients. To test the effect of lipogenic and glucogenic nutrients on energy partitioning, energy balance and nitrogen balance of 16 lactating dairy cows were determined by indirect calorimetry in climate respiration chambers from wk 2 to 9 postpartum. Cows were fed a diet high in lipogenic nutrients or a diet high in glucogenic nutrients from wk 3 prepartum until wk 9 postpartum. Diets were isocaloric (net energy basis) and equal in intestinal digestible protein. There was no effect of diet on metabolizable energy intake and heat production. Cows fed the lipogenic diet partitioned more energy to milk than cows fed the glucogenic diet [1,175 +/- 18 vs. 1,073 +/- 12 kJ/(kg(0.75) x d)] and had a higher milk fat yield (1.89 +/- 0.02 vs. 1.67 +/- 0.03 kg/d). The increase in milk fat production was caused by an increase in C16:0, C18:0, and C18:1 in milk fat. No difference was found in energy retained as body protein, but energy mobilized from body fat tended to be higher in cows fed the lipogenic diet than in cows fed the glucogenic diet [190 +/- 23 vs. 113 +/- 26 kJ/(kg(0.75) x d)]. Overall, results demonstrate that energy partitioning between milk and body tissue can be altered by feeding isocaloric diets differing in lipogenic and glucogenic nutrient content.

Dietary energy source in dairy cows in early lactation: energy partitioning and milk composition. Publishing Authors By Initials

AT van Knegsel,H van den Brand,J Dijkstra,WM van Straalen,MJ Heetkamp,S Tamminga,B Kemp,

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Dietary energy source in dairy cows in early lactation: energy partitioning and milk composition. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of dairy science

VOLUME: 90

Page Numbers: 1467-76

Journal Abbreviation: J. Dairy Sci.

ISSN: 1525-3198

DAY: 13

MONTH: Mar

YEAR: 2007

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LANGUAGE: eng

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AFFILIATION: Adaptation Physiology Group, Wageningen Institute of Animal Sciences, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands. Ariette.vanKnegsel@wur.nl

Country: United States

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MEDLINETA: J Dairy Sci

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