GROWTH response to organic arsenicals in poultry rations was first reported by Morehouse and Mayfield (1946). Anderson, Cunningham and Slinger (1952) tested a group of these arsenicals and obtained a variable response. Initial experiments at this laboratory (Anderson, Blakely and MacGregor, 1951) did not indicate any additional poult growth response to p-hydroxyphenyl arsonic acid when compared to a poult starter which contained procaine penicillin.In general, however, the results of feeding organic arsenicals to poultry have been positive (Bird, Grosche and Rubin, 1949; McGinnis et al., 1951). McGinnis et al. (1951) observed that with turkey poults some growth response to 3-nitro-4-hydroxy phenylarsonic acid was obtained in addition to the usual response to penicillin. This observation has been related to level of contamination of the environment by Morrison, Hunsaker and Aitken (1954). Hanson, Ferrin and Singh (1955) obtained an increase in gain due to p-arsanilic acid fed to hogs but the…
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