Unidentified Growth Factors Required by Chicks and Poults

Complexity of a Chick Growth Response to Egg Yolk, Animal Fat and Fish Solubles Additions to the Diet

“…In a previous report (Arscott and Combs, 1955), it was indicated that multiple deficiency states were not readily observed in rations wherein soybean oil meal constituted the major source of protein. Hill (1948) has shown soybean meal to be a variable carrier of the factor present in dried whey.…”

Ineffectiveness of Antibiotic Combination on Response of Chicks Fed Fish Solubles

“…These trials have been noted by Menge et al (1952), Branion and Hill (1953), Lillie et al (1953), Pappenhagen et al (1953), Combs et al (1954), and Arscott et al (1955). Despite the number of techniques developed and tried, the question of a positive assay still remains unsolved.…”