Fermentation Meals as a Source of Unidentified Chick Growth Factors

A Comparison of Unidentified Growth Factor Sources for Turkeys and Influence of Calorie-Protein Ratio on Response

“…Data presented by Schaefer et al (1955) suggested that fractions from streptomycin and penicillin fermentation processes contain unidentified growth factor (UGF) activity similar to that found in fish meal arid distillation solubles plus possibly an additional factor. In this respect, penicillin mycelium residue appeared to be qualitatively comparable to fish solubles as a source of the chick growth factor(s), according to Edwards eta!.…”

Unidentified Growth Factors Required by Chicks and Poults

“…The "Fermenfac" 3 used in experiment 3 has been described by Schaefer et al (1955) as a mix-ture of penicillin and streptomycin mycelia meals. The "Fermacto" used in experiment 3 is a fermentation product obtained from the Borden Company.…”