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Digestibility experiments with swine. I. The effect of fiber content on the digestibility of the feeds. Digestibility comparisons between brood sows and growing pigs



Digestibility experiments with swine. I. The effect of fiber content on the digestibility of the feeds. Digestibility comparisons between brood sows and growing pigs



Lantbrukshogskolan Husdjursforsoksanstalten Meddel 23: 5-77



The expts. reported cover the period 1943-1945 with such feeds as barley, oats, corn, field peas, alfalfa silage, mixed green oats and barley, as well as sugar beets. In addition, mixtures of corn and oats with increasing amts. of oats in the mixture, as well as expts. with increasing amts. of finely ground straw mixed with corn, were tried. Growing pigs with an initial wt. of 45 kg. and continued until of bacon wt. were used as exptl. animals. Other expts. included brood sows weighing 183-209 kg. The expts. were carried out according to Edin's method using Cr2O3 as a tracer substance. From them the following conclusions were drawn: The fiber content of feed has a marked influence upon the digestibility of other nutrients in the feed. An equation of regression of decrease in the digestibility of organic matter resulting from the increase of fiber in the feed was calculated. Brood sows were found much more efficient than growing pigs in ability to digest feeds with a high fiber content. This superiority varied with different feeds but was especially marked in the feeds that were high in protein, crude fat, and fiber. The opt. value for fiber content was not detd. It appears that the fat content of the feed has a negative influence on the digestibility of fiber. Finely ground grain was digested better than coarsely ground grain. The reliability of the method of difference used in the digestion trials was tested both by calculation and by expts. It is hoped that the standardized technique developed will be applied generally to expts. with pigs.

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