168 



THE DAlKYMAN S MANUAL. 



oxidized into urea before being expelled from the system. 

 In the cas'e of herbivorous animals liippuric acid is also 

 formed in variable quantities, and is found as an ingre- 

 dient of the urine. 



"The proportion of the nitrogen in the food which will 

 appear in the solid excrement is determined by the di- 

 gestion co-efficient of the albuminoids. Thus, seventy- 

 nine has been given as the digestion co-efficient of the 

 albuminoids of baiiey-meal when consumed by a pig; 

 it follows that in this case for 100 of albuminoids con- 

 sumed twenty-one will be voided in the solid excrement 

 and seventy-nine pass into the blood. It has been 

 stated that 500 pounds of barley-meal, containing about 

 fifty-three pounds of albuminoids, will in the case of the 

 pig produce 100 pounds of animal increase, containing 

 7.8 pounds of albuminoids. Its follows from these data 

 that for 100 pounds of albuminoids consumed 14.7 are 

 stored wp as carcase, twenty-one appear in the solid ex- 

 crement, and 64.3 as urea, etc., in the urine. In the 

 same way, by deducting the ash constituents stored up 

 from those present in the food, we arrive at the quantity 

 of ash constituents voided in the manure. Calculating 

 in this manner the relation of food to manure in the case 

 of the fattening ox, milking cow, sheep and pig, we 

 arrive at the following conclusions : 



NITROGEN STORED UP AND VOIDED FOR 100 CONSUMED, 



* The quantities of nitrogen given in this column are a little below 

 the ti-uth, as besides the undigested albumiuoids some nitrogenous 

 biliary matter is present in the solid excrement. With oxen and sheep 

 the amount of biliary matter in the excrement is very small, with pigs 

 it is more considerable. In the case of the pig the nitrogen in the solid 

 excrement should probably stand as 25, and that in the liquid as 59.3. 



