Abstract
THE addition of antibiotics to the diet has been repeatedly shown to increase growth rates. This area has been extensively reviewed by Branion et al. (1953) who have also discussed, in the same review, several suggestions as to the mechanism responsible for the observed increase in growth rates. Anderson et al. (1952) and Byerly (1964) and many others have suggested that the inclusion of the antibiotics in the ration of growing animals may improve the absorption of the nutrients in that ration. A recent paper by Lotenkov and Podluzknaya (1967) indicates that chlortetracycline at 20 mg./kg. stimulated intestinal absorption of amino acids in chicks. To further investigate the hypothesis that the growth stimulation obtained by feeding antibiotics was due to increased nutrient absorption, the following study was initiated, using a mineral, zinc, and a fatty acid, oleic acid.PROCEDUREIn each of the three trials to be reported, day-old broiler .
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