Sources of Unidentified Factors for Practical Poultry Diets

THE literature in the field of unidentified factor sources has been reviewed by Menge et al. (1952), Branion and Hill (1953) and Rasmussen et al. (1957). In previous studies conducted in our laboratories (Summers et al., 1959) it was found that, with diets containing either 2.5 percent of dried whey or 2.5 percent of dried buttermilk, no unidentified factor response could be demonstrated with three market samples of fish meal or three market samples of meat meal. Fish solubles, on the other hand, consistently improved growth under similar conditions. The unidentified factor response from fish solubles was not influenced by the levels of corn and wheat present in the diets. The present studies were designed to determine the value of fish solubles, dried whey, Vigofac, Neovite, Solulac, Stimuflav and Mazoferm. Vigofac is a fermentation product obtained from Pfizer Canada Ltd. Neovite is a fermentation product obtained from Dawe's Laboratories. Solulac …