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Effect of Environmental Factors on Monocarbonyl Potential in Fresh Bovine Milk Fat¹

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

ABSTRACT

A quantitative study of various environmental and physiological factors on the monocarbonyl potential in heat-treated bovine milk fat was conducted. Analyses of monocarbonyls (as their 2,4-dinitrophenylhydrazones) indicate a definite seasonal trend, being higher in the winter than in the summer. A highly significant (P < 1%) positive correlation between the monocarbonyls and the aliphatic deltalactones occurred over season.

Analyses of weekly samples throughout a complete lactation of the monocarbonyls and methyl ketones indicated a positive correlation (P < 1%) with the aliphatic delta-lactones and short-chain fatty acid (4:0–14:1) production. No significant difference in total monocarbonyl potential from fats of different breeds, fat production, and milk from ketotic animals could be shown. These data aid in characterizing the variability in formation of the nonoxidative compounds in milk fat and further lend support to the evidence that their precursors arise from, and are controlled by the availability of acetate during the biosynthesis of fatty acids.

¹ Authorized for publication October 19, 1967, as Paper no. 3314 in the Journal Series of the Pennsylvania Agricultural Experiment Station.