Methionine Hydroxy Analog: Varying Levels for Lactating Cows

Beginning two weeks before anticipated parturition and for 90 days post-partum, 24 Holstein cows received a concentrate (14.5% crude protein) containing either 0, 0.2, 0.4, or 0.8% methionine hydroxy analog. Concentrate was limited to 11 to 12kg/day and corn silage-urea (0.5%) was offered free choic...

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Published inJournal of dairy science Vol. 53; no. 5; pp. 607 - 610
Main Authors Polan, C.E., Chandler, P.T., Miller, C.N.
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 01.05.1970
Am Dairy Sci Assoc
American Dairy Science Association
Subjects
Animal Feed
animal science
Animals
Cattle - physiology
Fatty Acids - analysis
Female
Lactation - drug effects
Lipoproteins - blood
Methionine - blood
Methionine - pharmacology
Milk - analysis
Pregnancy
Triglycerides - blood
zoology
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Summary:Beginning two weeks before anticipated parturition and for 90 days post-partum, 24 Holstein cows received a concentrate (14.5% crude protein) containing either 0, 0.2, 0.4, or 0.8% methionine hydroxy analog. Concentrate was limited to 11 to 12kg/day and corn silage-urea (0.5%) was offered free choice. A milk production response curve indicated peak production at approximately 25g analog/day. Fat content of milk increased with analog intake. Reduced silage and concentrate consumption was common with the highest analog level. Free fatty acid and triglyceride content of serum α-lipoproteins and triglycerides of the β-lipoproteins were reduced in cows fed analog from those with no analog.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(70)86264-6