[Effect of exogenous factors on prececal nutrient and amino acid reabsorption, ascertained in swine with ileorectal anastomoses. 1. Effect of the degree of grinding up of grain]. / Einfluss exogener Faktoren auf die präzäkale Nährstoff- und Aminosäurenresorption, ermittelt an Schweinen mit Ileo-Rektal-Anastomosen. 1. Mitteilung. Einfluss des Zerkleinerungsgrades von Getreide.

Pigs fitted with ileo-rectal anastomoses (IRA) and in parallel experiments intact (INT) pigs were used to estimate the influence of the different grinding fineness of barley and wheat (coarse, medium, fine) on the apparent and true precaecal and total digestibility resp. absorption of various N free and N containing nutrients, among them crude protein and the indispensable and dispensable amino acids. Coarse grinding (25 ... 50% of the particles greater than 2 mm) resulted in significantly lower digestibility values than medium and fine grinding--with more striking differences in barley than in wheat. Precaecally most nutrients and amino acids are distinctly less digestible than at the end of the total tract. The precaecal lysine absorption determined with IRA pigs is remarkably low. The results are discussed. In order to attain a good utilization of the protein contained in cereals grains should be ground in hammermills with maximal sieve meshes of 3 mm. It is proposed to tabulate crude protein and amino acids in future on the basis of a standardized true precaecal digestibility resp. absorption.

[Proposal for an efficient crude fiber determination in routine analysis]. / Vorschlag zur rationellen Rohfaserbestimmung in der Routineanalytik.

On the basis of the method described in the standard TGL 21875/07--method II in GDR--and proved effective in practise, a rationalised method of the determination of crude fibres has been worked out. This method is described in detail; it makes greater than 60 individual determinations of crude fibre per worker and day possible. In contrast to the conventional determination of crude fibres (standard 21875/07--method I) this method is more efficient and its degree of standardisation is considerably higher. The results achieved on the basis of the conventional method of the determination of crude fibres (standard TGL 21875/07--method I Lepper-method) and the suggested method of determination with various feedstuff samples at the Zentralstelle für Futtermittelprüfung und Fütterung (Central Institution for Feedstuff Investigation and Feeding) Halle-Lettin and Department of Animal Nutrition of the Forschungszentrum für Tierproduktion (Research Centre for Animal Production) Dummerstorf-Rostock show that there are no statistically significant differences between the crude fibre values ascertained according to the two methods. Method II of the standard TGL 21875/07 should be replaced by the suggested method of determination because this method directly registers the crude fibre content.

[Nutrient composition of some newly bred high protein and/or high lysine grains and their digestibility determined on growing pigs]. / Nährstoffzusammensetzung und an wachsenden Schweinen ermittelte Verdaulichkeit einiger protein- und/oder lysinreicher Getreideneuzüchtungen.

With the view to complementing the feedstuff data store and, consequently, to further improving the GDR Feed Evaluation System, some newly bred high-protein and/or high-lysine cereal varieties and strains (spring barley, winter wheat, maize) were studied for their nutrient composition and digestibility. Apart from from WEENDER's feed analysis technique, more recent methods were applied to determine total fat (after HCl treatment), carbohydrates (enzymatic method), lignin and amino acids. The digestibility of the nutrients was determined using growing pigs of different live weight, the test rations being made up of the cereals under and supplementations of limiting amino acids as well as vitamins and minerals. In comparison with the values from currently applied tables, the newly bred strains and varieties proved to have markedly higher contents of crude protein, digestible crude protein, lysine and energetic feed equivalents. Compared to crude fat, the total fat values proved markedly higher in the barley and wheat samples. The readily soluble and easily hydrolizable carbohydrates found with the new analysis procedure suggested, were 100% digestible in all cereal samples used. Lignin proved the constituent most difficult to digest and must be regarded as virtually undigestible in the case of pigs.