42 HATCH EXPEKIMENT STATION. [Jan. 



Ration No. IV.* 



Weight of Pigs. 



Rations. 



20 to 60 pounds, 

 60 to 100 pounds, 

 100 to 180 pounds, 



3 ounces of corn meal to each quart of milk, and 4 ounces of gluten 



feed as a substitute for quart of milk. 

 Milk at disposal, and mixture of one-half corn meal and one-half gluten 



feed, to satisfy appetites. 

 Milk at disposal, and mixture of two-thirds corn meal and one-third 



gluten feed, to satisfy appetites. 



* This ration is preferable to Ration No. II. 



E. Experiments with Salt Hay. 

 The extensive series of experiments carried on to ascer- 

 tain the nutritive value of different kinds of salt hay were 

 completed and the experiments and results published in 

 Bulletin No. 50, in January, 1898, to which the reader 

 is referred for all details. 



F. Experiments to ascertain the Effect of Dif- 

 ferent Amounts of Protein upon the Cost and 

 Quality of Milk. 

 During the winter of 1897-98 two experiments, with 

 twelve cows, were carried out, to investigate the effect 

 of 1.50, 2 and 2.50 pounds of protein upon the cost and 

 quality of milk. The total amount of digestible nutrients 

 fed daily was the same in each case. Experiment I. ex- 

 tended over nine weeks and Experiment II. over four 

 weeks. This work has not been published. About 5 per 

 cent, more milk was produced on 2 pounds, and 10 per 

 cent, more on 2£ pounds, of protein daily, than when the 

 animals received l 1 pounds each. The quality of the milk 

 was scarcely changed. The cost of the different rations will 

 depend upon the cost of the several concentrated feeds. As 

 the market has been for the past two years, milk produced 

 by aid of the rations containing 2^ pounds of protein daily 

 would cost rather less than that produced by 1^ or 2 pounds. 

 The manure derived from the highest protein ration would be 

 10 per cent, more valuable, and the animals generally have 

 a better appearance than when receiving but 1| pounds per 

 day. It is believed that a continuous feeding of 2 or 2^ 

 pounds of protein daily tends, to some extent, to develop 

 the milk-producing capacity of the cow. Animals that will 



