Unidentified Factors in Poultry Nutrition

Unidentified Chick Growth Factors

“…Excellent reviews of these reports have been made by Combs (1951), Menge et al (1952a), Branion and Hill (1953), and Lillie et al (1953).…”

Unidentified Factors in Poultry Nutrition

“…This agreement has been attained even though widely different assay methods were used. These findings suggest that the two factors may be similar; on the other hand, differences in biological responses indicate that the substances are not identical (Lillie et al, 1953). experiment 9 (Table 3) show that the chick growth factor is soluble in 70 percent methanol and is dialyzable.…”

“…This work has been comprehensively reviewed by Combs (1951), Menge et al (1952a), and Briggs (1952). Studies conducted in this laboratory have shown condensed fish solubles to contain an unidentified chick growth factor, or factors, Lillie et al (1953). The present investigation was undertaken to prepare a potent concentrate of this factor and to study some of its properties.…”

Unidentified Growth Factors Required by Chicks and Poults

“…This relationship is apparent in the findings of Stephenson and Clower (1952), Arscott and Combs (1953), Berg and Blaylock (1953) and Patterson and Blaylock (1953). The studies of Sunde et al (1952) and Lillie et al (1953), failed to show differences in chick response to unidentified factor supplements as a result of differences in nutrition of the dams. SUMMARY Using chick growth as a criteria of measurement, the effect of iodinated casein, different carbohydrate sources, different levels of vitamins, multiple deficiency states and sex were studied as variables in unidentified factor assays.…”

“…The parental stock for experiment 6, however, received a complete ration containing fish meal and were housed on litter (Lillie et al, 1953). Experiments 1, 7, 8 and 9 contained 15 chicks; experiments 2, 3 and 6, 11 chicks; experiment 4, 13 chicks; experiment 5, 14 chicks; and experiment 10, 10 chicks per group at start of each trial except as otherwise noted.…”