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Relative Effectiveness of Various Antioxidants Fed to Lactating Dairy Cows, on Incidence of Copper-Induced Oxidized Milk Flavor and on Apparent Carotene and Tocopherol Utilization¹

Animal Industries Department, Connecticut Agricultural Experiment Station, Storrs

ABSTRACT

Twenty-four cows, 12 Holsteins and 12 Guernseys, were selected for producing milk which exhibited oxidized flavor 72 hr. after the addition of five p.p.m. of copper. After a one-week standardizing period, the cows were fed either no antioxidant, N,N'-diphenyl-para-phenylenediamine (DPPD), 2,6-di-tertiarybutyl-4-methyl phenol (BHT), 1,2-dihydro-2,2,4-trimethyl-6-ethoxyquinoline (Santoquin), or D--tocopheryl acetate (Myvamix, a dry carrier of D--tocopheryl acetate which exhibits antioxidant activity only after ingestion and hydrolysis to the phenolic form in the intestine and tissues), at a daily rate of 0.01-% of 90% dry matter ration, or 2-methyl-1,4-naphthoquinone (Menadione) at a daily rate of 25 mg. for a six-week comparison period. The following results were noted: (1) Fat percentage of the milk was slightly raised by the feeding of Menadione and decreased by the feeding of Santoquin; (2) total tocopherol values of the blood plasma and milk were apparently increased slightly by supplementation with DPPD, BHT, Santoquin, and Menadione, and markedly by supplementation with Myvamix, but these differences were not statistically significant except for the latter; (3) none of the antioxidants fed was as effective as DPPD in inhibiting the incidence of copper-induced oxidized milk flavor. No protection was afforded by any antioxidants, except DPPD in the presence of five p.p.m. of copper, and only partial protection by Myvamix and Menadione in the presence of one p.p.m. of copper.

¹ The data are part of a thesis submitted by the senior author to the Graduate School, University of Connecticut, in partial fulfillment of the requirements of the M.S. degree. This study was supported in part by grants from the Chas. H. Hood Dairy Foundation, the American Cyanamid Co., and the Chas. M. Cox Co.