432 Feeds and Feeding. 



It will be seen that, despite the addition of tallow to the ration 

 in increasing amount up to two pounds per cow daily, there was 

 the normal gradual falling oif in the milk flow, the percentage of 

 fat in the milk remaining substantially the same. With cow No. 2 

 there was possibly an increase of three-tenths or four-tenths of one 

 per cent, fat for a time succeeding the first use of tallow; there was, 

 however, a diminution in the milk flow, so that the total fat 

 secreted was increased by not more than one- tenth of a pound 

 daily, and even this increase might not have been due to the feed- 

 ing of tallow. After feeding this cow tallow four weeks, the total 

 fat in the milk had fallen below the amount she was giving at the 

 time tallow feeding began. Wing concludes: " In this quite ex- 

 tended trial there has been no increase in fat in the milk by feed- 

 ing 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 

 per head per day of tallow." 



At the New Hampshire Station, 1 Wood fed cotton-seed oil, 

 palm oil, corn oil, cocoanut oil, oleo oil and stearin in an ordi- 

 nary ration to cows, and concludes: "That the first effect of an 

 increase of fat in the cow's ration is to increase the per cent, of fat 

 in the milk; that with the continuance of such a ration the tend- 

 ency is for the milk to return to its normal condition; that the 

 increase in fat is due not to the oils, but to the unnatural char- 

 acter of the ration." 



663. Feeding potassium chlorid. Bieler 2 fed twenty-five grams 

 (about one ounce) of potassium chlorid per day per cow, and 

 noticed an appreciable increase in the yield of milk, but the solids 

 and fat decreased simultaneously. The effect of the potassium 

 chlorid on the milk secretion covered only a few days, when it 

 again became normal. 



664. Cooking feed. Spear 3 fed cooked meal to four cows and 

 uncooked meal to four others during a period of thirteen weeks. 

 The cows receiving the cooked feed gave six-tenths of a pound of 



* Bui. 20. 



2 Hilger's Jahresber., 1893, 403. 



3 Trans. High, and Agrl. Soc., p. 1891. 



