Fibrolytic enzymes to increase the nutritive value of dairy feedstuffs.

Fibrolytic enzymes to increase the nutritive value of dairy feedstuffs. Research Abstract Details 

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Fibrolytic enzymes to increase the nutritive value of dairy feedstuffs. Abstract Text:

E A Elwakeel,E C Titgemeyer,B J Johnson,C K Armendariz,J E Shirley,

In vitro studies and a lactation trial were conducted to investigate the effects of fibrolytic enzyme mixtures at different inclusion amounts. Seven enzymes in amounts designed to mimic addition of 1, 5, 15, or 30 g/d to dairy diets were incubated in vitro with either soybean hulls or alfalfa for 24 or 48 h. Enzyme treatments generally increased in vitro dry matter disappearance (IVDMD), but not volatile fatty acid production. For some enzyme mixtures, lesser amounts of enzymes led to greater increases in IVDMD, whereas for others there were no differences among the amounts tested. The enzyme mixture with the most cellulase activity was the most effective enzyme in improving IVDMD. In additional in vitro experiments, the same enzymes were used at an amount of 5 g/d, as well as at other amounts that showed promising responses in the first trial. Preincubation of substrates with enzymes before fermentation also was tested. Alfalfa, soybean hulls, corn silage, and corn gluten feed were used as substrates. Preincubation of the substrate with enzymes for 18 h before in vitro fermentation improved IVDMD. The effect on substrate solubilization of incubating substrates with the enzymes but without rumen fluid was also studied. Addition of enzymes to substrates without subsequent fermentation did not solubilize significant amounts of dry matter, indicating that the positive effect of preincubation cannot be attributed directly to hydrolysis of substrates before the in vitro fermentation with ruminal microbes. The fibrolytic enzyme that appeared most promising in vitro did not affect lactational performance when fed to dairy cows.

Fibrolytic enzymes to increase the nutritive value of dairy feedstuffs. Publishing Authors By Initials

EA Elwakeel,EC Titgemeyer,BJ Johnson,CK Armendariz,JE Shirley,

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Fibrolytic enzymes to increase the nutritive value of dairy feedstuffs. Journal Published:

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

Journal: Journal of dairy science

VOLUME: 90

Page Numbers: 5226-36

Journal Abbreviation: J. Dairy Sci.

ISSN: 1525-3198

DAY: 23

MONTH: Nov

YEAR: 2007

Fibrolytic enzymes to increase the nutritive value of dairy feedstuffs. Information

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LANGUAGE: eng

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Grant and Affiliation Information for Fibrolytic enzymes to increase the nutritive value of dairy feedstuffs.

AFFILIATION: Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506-1600, USA.

Country: United States

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MEDLINETA: J Dairy Sci

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