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Journal of Dairy Science Vol. 51 No. 1 22-27
© 1968 by American Dairy Science Association ®
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Effect of Environmental Factors on Lactone Potential in Bovine Milk Fat1

P. S. Dimick and J. L. Harner

Department of Dairy Science, The Pennsylvania State University, University Park

ABSTRACT

Butteroil from mixed herd milk collected weekly was steam-deodorized and the C-10, C-12, and C-14 aliphatic delta-lactones quantitated. The samples, representing 276 animals, averaging 96.0 ppm of lactone (range 58.6-139.0) and 67.2 ppm of lactone (range 47.7-100.2) while on barn feed and pasture feed, respectively, exhibited a pronounced seasonal trend, being higher in the winter than in the summer.

Analyses of weekly milk samples from an individual Holstein during a 310-day lactation indicated dramatic shifts in lactone potential. Following parturition the concentration was 25-30 ppm, which increased to 170-180 ppm at about 150 days. Throughout lactation, lactone concentration showed a negative correlation (P<1%) with the per cent fat and fat yield. Fatty acid analyses indicated a positive correlation (P<1%) between lactone content and short-chain fatty acid (4:0-14:1) composition.

Analyses of milk from various breeds, on identical feeding regimens, showed a slightly higher lactone potential in Holstein fat. Ketotic animals were characterized by a marked depression in steam volatile compounds, i.e., lactones, earbonyls, and fatty acids.

These data, together with other information, strongly imply that the lactone precursors are biological in origin and may be involved in fatty acid synthesis.

FOOTNOTES

1 Authorized for publication August 4, 1967, as Paper no. 3286 in the Journal Series of the Pennsylvania Agricultural Experiment Station.






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Copyright © 1968 by the American Dairy Science Association ®.