. Cyclopedia of farm animals. Domestic animals; Animal products. PRINCIPLES OF STOCK-FEEDING 61 in the digestion of food of any kind a certain amount of nitrogenous waste products is produced by the digestive organs and excreted in the feces, where, by the ordinary methods of digestion ex- periments, it is regarded as undigested protein of the food. When such allowance as is possible is made for these waste products, the real digesti- bility of the protein is found to be little affected. On the other hand, the decrease in the digestibil- ity of the nitrogen-free extract and crude fiber is not
. Cyclopedia of farm animals. Domestic animals; Animal products. PRINCIPLES OF STOCK-FEEDING 61 in the digestion of food of any kind a certain amount of nitrogenous waste products is produced by the digestive organs and excreted in the feces, where, by the ordinary methods of digestion ex- periments, it is regarded as undigested protein of the food. When such allowance as is possible is made for these waste products, the real digesti- bility of the protein is found to be little affected. On the other hand, the decrease in the digestibil- ity of the nitrogen-free extract and crude fiber is not susceptible of any such explanation, but is a real effect. Its cause has not been fully elucidated, but seems to be connected with modifications in the fermentations taking place in the digestive organs, due to the difference in the character of the food completely, the difference naturally being greater with the less easily digestible ones. Straw is digested only to about half the extent by the horse that it is by sheep. For hay and similar materials the digestibility by the horse is 20 to 25 per cent lower than that by sheep. With clover or alfalfa hay the difference falls to about 10 per cent, while concentrates are digested practically to the same extent by both species. The crude pro- tein of all these materials is about equally well digested by both animals, the differences falling chiefly on the carbohydrates. As in the comparison of sheep and cattle, this probably means a less extensive fermentation in the digestive tract, and may not necessarily imply any lower nutritive. Fig. 61. The McECkern respiration apparatus. (Adapted from Die Landw. Versuchs- Stationen, Vol. xliv, Plate I.) supply to the bacteria and other organisms inhabit- ing the alimentary canal. This is indicated by the fact, among others, that addition of substances like asparagin or ammonium acetate to the ration has been found as effective in overcoming this depression in digestibility as has addition o
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