58 MANUAL OF MILK PRODUCTS 



exception (Gem Valentine) there are no greater variations 

 among the cows which alternated from the usual ration to palm- 

 nut meal than among those which were fed an unchanging ration. 

 Thus, taking everything into consideration we do not feel war- 

 ranted in saying that the feeding of palm-nut meal increased the 

 per cent of fat in the milk. 



"When the food of the cows was changed from the usual 

 ration to one containing from four to seven pounds of palm-nut 

 meal and then to the usual ration again, there were variations 

 in the fat-content of the milk, but no more nor greater than 

 when the food of the cows was unchanged." 



Wing, 1 of the Cornell Station, tested out the effect of addi- 

 tional fat in the ration upon the percentage of fat in the milk, 

 by feeding two pounds a day of tallow, in addition to the regular 

 ration. He summarizes his results thus : 



"In this quite extended trial there has been no increase in 

 the fat in the milk by feeding tallow to the cows in addition 

 to a liberal grain ration. These results were obtained with 

 ten different cows, of two breeds of various ages, in various 

 periods of lactation, extending over a period .of ten weeks, 

 for at least six of which they ate two pounds a head, each day, 

 of tallow." 



The Iowa Station 2 carried out an experiment with four cows 

 to test the effect of sugar-meal and corn- and cob-meal on the 

 composition of the milk. 



" The cows were fed in pairs. Nos. 21 and 22 had the corn- and 

 cob-meal ration during period 1, the sugar-meal ration during 

 period 2, and corn- and cob-meal again in period 3. Nos. 33 

 and 65 had the same feeds in different order; namely, sugar- 

 meal first, then corn- and cob-meal, then sugar-meal again in 

 period 3. 



"The rations were fed for a week before the beginning of period 



*. U. Bui. 92. 2 Iowa Bui. 14, pp. 126-127, 142. 



