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Journal of Dairy Science Vol. 61 No. 7 932-939
© 1978 by American Dairy Science Association ®
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Lactational, In Vitro, and Chemical Evaluation of Untreated and Formaldehyde-Treated Casein Supplements1

G. A. Broderick and G. T. Lane2

Department of Animal Science, Texas A&M University, College Station 77843

ABSTRACT

Supplemental feeding of casein treated with .8% wt/wt formaldehyde was compared with untreated casein or no supplement for eight Holsteins averaging 29 kg milk/day. Compared to untreated casein, formaldehyde-treated casein supplementation had no significant effect on yield of milk or milk components except for a small increase in secretion of milk urea. When supplemental treated casein was compared with no supplement, yields of milk, total protein, "true" protein, and urea in milk increased. Urea and albumin concentrations in plasma were not affected by dietary treatments, and there was a small correlation between urea in plasma and milk.

Ruminal in vitro and chemical tests on the treated casein and small batches of casein treated with .2 to 4.0% wt/wt formaldehyde showed curvilinear decreases in the in vitro release of ammonia and total amino acids with increased formaldehyde. Although the release of ammonia and amino acids from treated casein in the feeding study was near zero, release of ammonia was negative for preparations treated with more than 1.5% formaldehyde. Acid-labile formaldehyde analysis indicated that recovery of applied formaldehyde was low. Formaldehyde treatment resulted in smaller losses in available lysine than expected, and most of the reacted formaldehyde was bound to amino acid residues other than lysine.

FOOTNOTES

1 Technical article 13724 of the Texas Agricultural Experiment Station, College Station 77843.

2 Department of Animal Science, University of Kentucky, Lexington 40506.






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Copyright © 1978 by the American Dairy Science Association ®.