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This paper is the second of a series reported from the Utah Station on the transfer of dietary DDT to eggs and poultry tissues. The first paper was reported by Bryson et al. (1950) on the accumulation of DDT in poultry products. The published literature on this topic has been reviewed and reported by Bryson et al. (1950). EXPERIMENTAL THE alfalfa hay fed in this experiment was from the same field described by Harris et al. (1949). This alfalfa was dusted with 0, 1, 2, and 4 pounds of technical DDT per acre. The harvested hay was ground into meal and 15 percent of this meal was included in the laying mash. DDT was also added to a similar mash made from untreated alfalfa meal at levels of 0, 50, 100, and 200 p.p.m. These diets are reported in Table 1. The design of this experiment is as follows: A . . .

Summary Methoxychlor did not appear in measurable amounts in the blood, milk or tissues of six dairy cows consuming alfalfa hay that had been dusted in the field with methoxychlor. Two cows receiving untreated alfalfa hay likewise had no methoxychlor in their milk, blood or tissues. There was no effect on milk or butterfat production or on feed consumption as a result of feeding methoxychlor-treated hay. The methoxychlor residue on the hay was 0, 7, 9.5 and 14 ppm. for the alfalfa treated with 0, 1, 2 and 2.8 lb., respectively, of methoxychlor per acre. There was no apparent effect of consuming the methoxychlor-treated hay upon the health of the cows. Good economic control of alfalfa weevil larvae was obtained in the plots of alfalfa dusted with methoxychlor. The treated plots gave a somewhat greater yield of hay than the untreated plots.

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