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Feather and Hair Meals for Ruminants. III. Relationship between Enzymatic or in Vitro Rumen Digestibility and in Vivo Digestibility of Diets Containing Feather and Hair Meals^1,2,

Oregon State University³, Corvallis 97331

Abstract

In vitro enzymatic studies (pepsin and pancreatin) and in vitro rumen fermentation trials were conducted to study the relationship between in vitro and in vivo digestibility of nutrients in diets. In vitro trials were conducted on triplicate samples of complete diets. The diets included those supplemented with cottonseed meal, commercial feather meal, special feather meal and commercial hair meal. Nutrient digestibility generally increased with increasing enzyme :N ratios. In vivo crude protein (CP) digestion and N retention (eg/kg BW^.75) were predicted best by pepsin-pancreatin combinations with r values of .52 and .60, respectively (P<.05). Percentage N retention was predicted best by in vitro pepsin digestion of CP. In vitro pepsin dry matter (DM) digestibility was the best predictor of in vivo DM and organic matter (OM) digestibilities (r = .55 and .61, respectively, P<.01). However, in vitro rumen digestibility of DM gave the highest correlation with in vivo digestible energy (r = .64, P<.01). In vitro digestibility of nutrients by pancreatin was a poor predictor of in vivo digestibility of nutrients in the diets used. In vitro pepsin digestibility was a better predictor of in vivo digestibilities of diets supplemented with feather meal than those of diets supplemented with cottonseed meal. This study showed that in vitro proteolytic enzyme and rumen digestion studies can be used effectively to predict in vivo digestibilities of nutrients in ruminant diets.

¹ Tech. Paper No. 5933, Oregon Agr. Exp. Sta.

² Partial support supplied by Fats and Proteins Research Foundation, Inc., Des Plaines, IL.

³ Dept. of Anim. Sci.