New York Agricultural Experiment Station. 407 



In table III the average results obtained with six cows [from 

 December 1st to January 31st are given. These cows were of tlie 

 average age of 3.3 years and had been in milk on the average 9.2 

 months at the beginning of the trial. 



During the month of December mixed hay was fed at night, corn 

 silage morning and noon, and a mixed grain (Ko. 23) composed of 

 six parts wheat bran, live parts ground oats, two parts linseed meal 

 O. P., and two parts cottonseed meal. The grain i-epresented 51.8 

 per cent, of the cost of ration and supplied 34.4 per cent, of the total 

 nutrients. The silage represented 27.5 per cent, of the cost and sup- 

 plied 44.3 per cent, of the nutrients. 



During the month of January corn silage was fed at noon and 

 mixed hay morning and night, the mixed grain being the same as 

 for the preceding month. The grain represented 51.1 per cent, of 

 the cost of the ration, and supplied 36.2 per cent, of the total 

 nutrients, the silage representing 15.1 per cent, of the cost and 

 supplying 25.9 per cent, of the total nutrients. 



There was an average gain in live weight per cow during Decem- 

 ber of 32 pounds, and during January of 13 pounds. After the 

 change from the first period when silage was fed twice a day and 

 hay once, to the second, when silage was fed but once a day, not 

 so much food was eaten, and the amount of dry matter in the food 

 consumed was consequently less. The nutritive ratio remained the 

 same, and there was no change in the cost of the ration . There 

 was considerable decrease in the total amount of constituents digesti- 

 ble and the fuel value was lower. The falling off in the milk yield 

 was not much more than the normal. The higher percentage of 

 fat made the amount produced about tlie same. There was consid- 

 erable increase in the cost of milk, but little in the cost of fat. 



For December the greatest daily average milk yield was 24.2 

 pounds and the smallest 9.4 pounds. The highest average per 

 centage of fat was 6.27 and the lowest 3.15. For January the ex- 

 tremes in daily av^erage milk yield were 20.9 pounds and 8.9 

 pounds and in average per centage of fat 6.30 and 3.46. 



