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The Influence of Hydrogenation and of Yeast in Counteracting Cod Liver Oil Injury in Herbivora, and the Influence of Salmon Oil on Milk Fat Secretion¹

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Laboratory of Animal Nutrition, Cornell University, Ithaca

Two experiments were run with lactating cows to determine the effect of feeding hydrogenated cod liver oil upon the secretion of milk fat. In contrast to the original oil, the hydrogenated product neither lowered the fat percentage of the milk nor significantly raised the iodine number of the milk fat. Limited evidence from feeding this hydrogenated oil to guinea pigs also indicated that it does not produce muscle lesions over a period of 60 days, although such lesions are regularly produced with the oil before hydrogenation. The feeding of from to 1 pound of dried yeast daily with the usual amount of cod liver oil did not counteract the lowering of the milk fat caused by the oil in lactating cows. Two additional studies of the influence of salmon oil on milk fat secretion in cows indicated that this oil does not react like cod liver oil. If the injurious factor is present it is probably in a lower concentration.

Manuscript received 18 October 1937.