Unidentified Growth Factors Required by Chicks and Poults

Efficacy of Zinc Bacitracin and Sources of Unidentified Growth Factors with Corn-Soybean Meal Type Diet for Turkey Poults

“…Combs et al (1957) used a basal diet containing considerable fish meal and failed to obtain further growth improvements in turkeys from brewers yeast, dried whey, dried distillers molasses solubles, dried distillers solubles, dried butyl fermentation solubles, and other fermentation products. Combs et al (1957) used a basal diet containing considerable fish meal and failed to obtain further growth improvements in turkeys from brewers yeast, dried whey, dried distillers molasses solubles, dried distillers solubles, dried butyl fermentation solubles, and other fermentation products.…”

Fish Byproducts, Poultry Byproducts Meal, and Methionine Hydroxy Analogue as Variables in Broiler Rations

“…Summers et al (1959a) did not obtain a growth response from fish meal or meat meal using practical broiler rations containing growth stimulants and 2.5 percent dried whey or dried buttermilk; but fish solubles stimulated growth fairly consistently. Combs et al (1957) did not observe any improvement in the performance of turkeys as a result of supplementing rations already containing sources of fish factor with dried whey or other sources of the whey factor. Combs et al (1957) did not observe any improvement in the performance of turkeys as a result of supplementing rations already containing sources of fish factor with dried whey or other sources of the whey factor.…”

The Effects of Whey and Yeast on Digestibility of Nutrients in Feather Meal

“…The lack of weight gain and feed efficiency responses from dried brewers' yeast has been demonstrated by Combs et al (1957) and Balloun et al (1968). Miller and Balloun (1966) did not obtain a significant growth response of turkey poults when yeast was added to the diets; however, they noted a 10 to 15% improvement of weight gain when the combination of 2% each of dried brewers' yeast and fish meal was added.…”