Abstract
THE role of vitamin B12 for hatchability of chicken eggs has been established and reported by several investigators including Lillie et al. (1949), Petersen et al. (1950), Carver and McGinnis (1950), Milligan and Combs (1950), Peeler et al. (1951), and Johnson (1951). It has also been established that vitamin B12 is transferred from the hen, through the egg, to the newly-hatched chick when breeder hens received the vitamin from animal protein, litter, or crystalline B12. The work reported by Milligan and Combs (1950) showed that 4.0 micrograms per kilogram of the breeder diet failed to transfer sufficient B12 for good growth of offspring not fed supplementary B12. A level of 8.0 micrograms in the breeder diet was also slightly marginal.This paper reports the results obtained when chicks, hatched from hens which had received various levels of vitamin B12, were fed experimental rations to determine carry-over of B12 from their .
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