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- W2068388747 abstract "Growth studies were conducted with 96 Holstein calves to determine the effects of chlortetracycline, streptomycin, and a mixture of bacitracin and penicillin at three levels for two periods, and the effects of two levels of milk feeding. The antibiotics tended to increase the performance of the calves with greater effects on the calves fed the low milk ration. The mixture of bacitracin and penicillin was net as effective as the chlortetracycline and streptomycin except in controlling diarrhea. Calves fed 350 lb. of milk grew faster for the first seven weeks than those fed 175 lb., but the antibiotics minimized this by increasing the performance of the low-milk group. The antibiotics may have a milk-sparing effect. Editor. The early reports of Loosli and Wallace (11), Bartley et al. (2), and Rusoff (15) stimulated considerable research on the value of antibiotics in the nutrition and upon the health of the dairy calf, and this has been reviewed by Knodt (9), Reid et al. (14), and Lassiter (10). However, several papers pertinent to this study have appeared since these reviews. Swanson et al. (19) fed calves a liberal ration of milk and grain during early life and demonstrated no consistent increase in growth rate when cblortetracycline was added to the diet. The mean growth rates, however, were slightly in favor of the supplemented group. Bartley et al. (3) compared chlortetracycline with streptomycin and found streptomycin increased daily gain and feed efficiency and decreased scours somewhat, when compared with the control calves, but ~vas not as effective as chlortetracycline in regard to any of these criteria. Both 30 and 90 rag. per 100 lb. body wt. per day of streptomycin were fed, whereas only the 30-rag. level of chlortetracycline was used. No differences were noted between the two streptomycin levels. Research regarding the possibilities of antibiotics acting on calves through changes in digestibility of feed components is conflicting and incomplete. Bartley's results (4) did not indicate a consistent improvement in digestibility of any of the feed components by addi~lg chlortetracycliue to the ratioll of dairy calves at either nine or 13 weeks of age. Hogue et al. (8), however, have obtained improvement in protein digestibility and nitrogen retention when chlortetraeycline was added to the ration of calves. The same type of responses was obtained when bacitracin was used, but these responses were not as great as those observed with chlortetracyclinc. Radisson st al. (12, 13) have indicated that the effect of antibiotics may be through alteration of the intestinal flora of the dairy calf. MATERIALS AND METHODS" @default.
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- W2068388747 date "1957-09-01" @default.
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- W2068388747 title "Comparison of Antibiotics for Dairy Calves on Two Levels of Milk Feeding" @default.
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- W2068388747 doi "https://doi.org/10.3168/jds.s0022-0302(57)94597-6" @default.
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