Cclxxi. the Transmission of Vitamin a from Parents
نویسنده
چکیده
IN an earlier paper [Dann, 1932, 2] an account was given of experimental work devised to ascertain the channels through which young mammals receive supplies of vitamin A up to the time of weaning. The placenta, the colostrum and the milk are the three available channels; but of their relative importance and the factors controlling the efficiency of each we know almost nothing. The experiments previously described were made upon rats and rabbits, and unfortunately in these species it was not possible to distinguish between the colostrum and the milk. It is therefore necessary to examine the colostrum and milk of other species in order to find their relative importance in supplying vitamin A to the suckling. At the same time it is to be expected that variation will occur between different species, and so it will be necessary to examine the colostrum of a number of species before drawing any general conclusions about the importance of colostrum as a vitamin A carrier. In this paper a preliminary study of cow's colostrum is described.
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