504 EXPERIMENT STATION RECORD. 



ration, and 60.5 cts. on the grain ration, and the cost of a pound of butter 8.82 and 

 lL'.nii cts., respectively. 



Soy-bean silage and alfalfa hay v. purchased feed (pp. 396-402). — In tins experiment 

 4 cows were fed for two 15-day periods to compare a ration of 36 lbs. of soy-bean 

 silage, 8 lbs. of alfalfa hay, and (5 lbs. of corn meal, with one composed of 6 lbs. of corn- 

 stalks, 36 lbs of corn silage, 4 lbs each of wheat bran and dried brewers' grains, and 2 

 lbs. of cotton-seed meal. On the soy-bean silage and alfalfa-hay ration 5.81 percent 

 more milk was produced than on the grain and silage ration, while the yield of butter 

 was practically the same on the 2 rations. There was a saving of 8.5 cts. per hun- 

 dred in the cost of producing milk, and 1.1 cts. per pound in the production of 

 butter when the soy-bean silage and alfalfa-hay ration was fed. 



"These data are significant in showing not only the value of such home-gn wn 

 crops as soy-bean silage and alfalfa hay, but also that a ration may be produced on 

 the farm that is quite superior as a milk producer to one in which the fine feeds arc 

 purchased; at the same time it is furnished at less cost." 



( btton-seed meal v. wheat bran mid dried brewers 7 (/ruins (pp. 402-411) . — A grain ration 

 consisting of 4£ lbs. of cotton-seed meal was compared with one composed of 5 lbs. 

 each of wheat bran and dried brewers' grains, 36 lbs. of corn silage and 6 lbs. of 

 cornstalks being fed with each ration. The feeding covered 4 periods, 2 lots of 2 cows 

 each being used. 



The summary of the results shows that the amount of milk and butter produced 

 from the 2 rations was practically the same. The cost of food per 100 lbs. of milk 

 was 54.1 cts. on the cotton-seed meal ration and 66 cts. on the mixed grain; and of 

 butter 11 cts. and 14.3 cts., respectively. "In other words, the results indicate that 

 when dried grains cost $20 and wheat bran $21 per ton, the dairyman can afford to 

 pay $42 per ton for cotton-seed meal when producing milk." 



Cooperative experiments with, milch cows, 1902-3, H. Goldschmidt, C. M. 

 K.ieldsen, and J. A. Lemming {Copenhagen, 1903, pp. 52 -\-XVI, charts 16). — This is 

 an account of the first series of cooperative feeding experiments with milch cows 

 conducted on 13 Danish dairy farms for the purpose of studying the economy and 

 the effect on the milk production of introducing certain changes in normal feed 

 rations met with in Danish feeding practice, in such a way that an increase or a 

 decrease of either protein or nonnitrogenous components of the rations was supplied. 

 The elaborate plan of the experiments and details as to their conduct are given in 

 the report; but only a brief statement as to the main conclusions drawn by the 

 authors can be given here. 



The normal rations fed consisted of a basal portion of 0.7 lb. digestible protein and 

 7 lbs. calculated digestible carbohydrates (nitrogen-free extract + fat X 2.4) per 

 1,000 lbs. live weight, and a productive portion of 0.55 lb. of digestible protein and 

 1.3 lbs. digestible carbohydrates per 10 lbs. milk. This ration was found somewhat 

 too high in both protein and carbohydrates to prove the most profitable, but on the 

 whole may be considered a satisfactory guide to the feeder. The experiments illus- 

 trate plainly the economy of feeding in accordance with the amount of milk produced 

 by the cows at the different stages of the period of lactation. — f. w. woll. 



The dairy, J. Mahon (Queensland Dept. Ayr. Ji]>t. 1904, pp. 30-33). — Data are 

 given regarding the milk and butter yield of the station cattle, and a test on the 

 feeding value of white carrots for dairy cattle is reported. 



Investigations on the electrical resistance of milk, F. Petersen (Milch Ztg., 

 33 (1904), No. 36, pp. 567, 56S). — The main results of the investigation may be stated 

 as follows: The electrical resistance of normal cow's milk is dependent on its com- 

 position and on the temperature of the milk, falling with rising temperature, and 

 vice versa. The average resistance of milk from single cows was found to range 

 between 186 and 304 ohms at 15° C, and averaging 231.64 ohms; while that of 

 mixed-herd milk fell between 204 and 255 ohms at 15° C. 



