Abstract
The provision of 1,25-dihydroxyvitamin D 3 as the only source of dietary vitamin D 3 to laying hens failed to support normal embryonic development in their fertile eggs. Significant ( P < .001) improvement in embryonic survival to hatching in these eggs resulted from injections of 1,25-dihydroxyvitamin D 3, 24,25-dihydroxyvitamin D 3, 25-hydroxyvitamin D 3, or 24,24-difluoro-25-hydroxyvitamin D 3 prior to incubation. Maximum embryonic survival with lowest embryonic mortality was observed when 0.20 μg/egg of 1,25-dihydroxyvitamin D 3 or 0.60 μg/egg 25-hydroxyvitamin D 3 was injected. These results indicate that several forms of vitamin D, two of which cannot be converted to 24,25-dihydroxyvitamin D 3, can provide this activity; and of the vitamin D compounds tested, 1,25-dihydroxyvitamin D 3 may be the most active in supporting embryonic survival in the chick when delivered directly by injection.
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