Ileal and total tract digestibility of barley and oats in pigs and predictions of nutritive vale.
1996
Pettersson Aa.
Barley and oats are important feedstuffs in Sweden. Considerable variation in chemical composition and nutritive value of cereals due to cultivar, climatic and agronomic conditions has been demonstrated. The aim of this thesis was to study the effects of the chemical composition of barley and oats on the ileal and total tract digestibility in pigs and rats and to provide means to predict the nutritive value for pigs. Among barleys, naked versus covered cultivars resulted in superior nutrient digestibility and energy values. Similar results were found for oat batches differing in fibre content, at the ileal as well as the total tract level. The nutritive values of barley and oats were strongly correlated with the dietary contents of fibrous constituents such as crude fibre, total fibre, NDF and ADF. The fibrous components were superior predictors compared with the starch content. The ratio of amylose:amylopectin in barley starch influenced nutrient digestibility. Thus, ileal digestibilities of organic matter, energy, NFE, starch and beta-glucans of high-amylose barley were significantly lower than in high-amylopectin and regular starch barleys. By testing the pig diets on rats, highly significant interrelationships were found for energy digestibility between animal species. By including Nebacitin in barley-based diets fed to rats, nutrient total tract digestibilities were lowered as compared with unsupplemented diets and corresponded to the ileal digestibilities observed in pigs. The interrelationship between digestibility of energy in the rat and the in vitro ileal and total tract DM digestibility, indicates that the in vitro technique used had a predicting potential for oats. The close correlation of rat results and total tract digestibility of energy in pigs should allow an extrapolation to pigs.
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