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Feeding penicillin for control of bloat in grazing cattle, and its effect on milk production



Feeding penicillin for control of bloat in grazing cattle, and its effect on milk production



Michigan State Univ Agric Exptl Sta Quart Bull 40(3): 460-467



The occurrence of bloat in 739 cows on 20 Michigan farms was studied for 150 days of grazing. Herds on 15 farms were divided and 100 nag procaine penicillin carried in 2 oz. of soybean oil meal was fed daily or every 3d day to each cow in 1/2 of the herd. The remainder in these herds were the control. Herds on the other 5 farms were given salt containing 3 g procaine penicillin per lb. Milk production was 0.2 lb. per cow per day lower in the penicillin fed groups. The bloat incidence was 9.7% with a mortality of 4.2% of the bloated animals. Bloat incidence was reduced by a factor of about 2/3 in the penicillin fed groups. Efficiency of treatment appeared to decrease as the feeding period progressed. Undesirable symptoms were noted when 400 mg procaine penicillin were included in the daily ration.

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