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VETERINARY HYGIENE 



different amounts of food, but rather that it is subject to variation 

 in either direction. 



From the experiments carried out in America by Armsby and 

 Fries for the purpose of determining the net energy values of foods, 

 valuable data concerning the gaseous excretion by cattle of varying 

 weights and consuming different quantities of food are available. 

 The following selections* are given not only because they are recent 

 findings, but also for the purpose of emphasising the difficulty 

 of giving an average figure that will be even approximately correct 

 for all classes of cattle. 



Table showing the carbon dioxide excretion from steers on 

 maintenance and fattening diets : 



An examination of the above table will show that the quantity 

 of carbon dioxide excreted by a steer weighing about 1000 Ibs. 

 while on a maintenance diet is 70 or 80 cubic feet for a twenty- four 

 hour period, which is a similar amount to that excreted by horses 

 of a like weight. The table shows that cattle weighing thirteen 

 hundredweight will excrete about 6-5 cubic feet of CO 2 per hour 

 when on a fattening diet; and as it seems reasonable to suppose 

 that there is a similarity between the gaseous excretion of heavy 

 horses and heavy cattle as there is between the lighter animals, 

 it is not improbable that heavy draught horses weighing 14 or 15 

 hundredweight will discharge into the air at least 6 cubic feet of 

 CO 2 per hour when they are on a full productive diet. 



A fattening pig or sow will discharge approximately 1 5 cubic 

 * Kindly supplied by Professor Armsby. 



