Effect of Antibiotics, Synthetic Vitamins, Vitamin B12 and an APF Supplement on Chick Growth

Antibiotics and the Growth of Ducks

“…Support for this theory was furnished originally by the findings of Groschke and Evans (1950) that the injection of aureomycin, of McGinnis et al (1950) of aureomycin of streptomycin, of Whitehill et al (1950) of aureomycin or penicillin, did not result in a growth response. Penicillin effected an increase in the numbers of aerobes, anaerobes and coliforms.…”

Effect of Dietary Antibiotic upon Feed Efficiency and Protein Requirement of Growing Chickens

“…Berg et al (1950) obtained no difference in feed conversion rates when this product was added to a diet containing fish meal. Neither Scott and Glista (1950) nor Groschke and Evans (1950) showed an increased efficiency when crystalline aureomycin was added to diets containing all the known vitamins including B 12 .…”

“…Studies by Stokstad and Jukes (1950), Groschke and Evans (1950), and McGinnis et al (1950) growth promoting constituents of these products are aureomycin and vitamin B12. Whitehill et al (1950) have also demonstrated the stimulatory effect of aureomycin on the growth of chicks.…”

Fish Meal and the Response of Chicks to Antibiotics

“…Groschke and Evans (1950) concluded that the performance of an APF supplement, which contained aureomycin, was influenced by fortification of the diet with B-complex vitamins. Scott and Glista (1950) reported that the addition of aureomycin to a corn-soybean oil meal diet, fortified with the known vitamins, only gave a slight response in the first few weeks with ad libitum feeding and none when feed intake was equated.…”