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Estimation of the digestibility of feedingstuffs with the help of plant pigments that are present in the feed. 4. Application to grazing cattle



Estimation of the digestibility of feedingstuffs with the help of plant pigments that are present in the feed. 4. Application to grazing cattle



Centraal Inst. Landbouwk. Onderzoek, Overdruk. (1955). 275-276, 224-228



Another experiment with grazing cattle is described in which pigments were extracted from grass and faeces with acetone and oxalic acid, but as reference chromogen the residue after removal of the carotene and xanthophyll fractions was used. Again digestibility of crude protein so measured agreed well with that calculated by Dijkstra's method. Cu and Mn were estimated also. Per kg. dry matter grass contained 9.3 mg. Cu and 55.0 mg. Mn, and of these amounts 1.8 and 4.2 mg. were absorbed.

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