Abstract
Literature has revealed conflicting data on the role of antibiotics on egg production of chickens. The work of Sunde, Halpin and Cravens (1952), Petersen and Lampman (1952), and Lillie and Bird (1952) indicated that antibiotics did not improve egg production. On the other hand, Petersen, Lampman and Wiese (1952) reported that the inclusion of a vitamin B12-antibiotic feed supplement in an all-vegetable protein ration deficient in vitamin B12 improved egg production. According to Elam, Gee and Couch (1951), penicillin improved egg production of crossbred hens receiving vitamin B12 by injection. This finding was confirmed by Carlson, Wilcox, Kohlmeyer and Jones (1953) who also found that streptomycin was more effective than penicillin in this respect. The over-all egg production of New Hampshires and White Rocks was below 50 percent in their studies.In previous nutritional experiments, the genetic variation of egg production was noted. Therefore, attempts were made in this study …
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