Abstract
CONSIDERABLE work has been done on the vitamin D requirements of hens. Hughes and co-worker (1924, 1925) observed that ultra-violet light influenced egg production, egg shell thickness, chemical composition of eggs, hatchability, blood calcium and phosphorus, and bone structure. These observations were partially confirmed by Hart et al. (1925).Carver, Robertson, Brazie, Johnson and St. John (1934) found that 67 U.S.P. units of vitamin D per 100 grams of diet were necessary for good egg production and egg shell quality. Murphy, Hunter, and Knandel (1936) found that 58 U.S.P. units or less per 100 grams of diet were unsatisfactory, but that 78 U.S.P., units gave satisfactory results. Bethke, Record, Wilder, and Kennard (1937) believed that the laying bird requires 50 or more U.S.P. units of vitamin D per 100 grams of diet for optimum hatchability. Smith and Branion (1937) studied the yitamin D requirements of laying hens having access to .
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
