219 



Some observations on contaminated water supply for live 

 s TijCK, M. Stalker, V. S. (pp. 118-120). — Observations by the author 

 on sickness among farm animals caused by drinking impure water are 

 cited to enforce the desirability of attention to this matter on the part oJ" 

 farmers. 



Iowa Station, Bulletin No. 14, August, 1891 (pp. 73). 



Effect of food upon quality of milk, J. Wilson, D. A. Kent, 

 B. S., C. F. Curtiss, B. S. A., and G. E. Patrick, M. S. (pp. 123-142).— 

 In this experiment as to the effect of rations containing different 

 amounts of protein, fat, and carbohydrates on the composition of the 

 milk, four cows were used, • three being grade Shorthorns, and the 

 other a grade Holstein, all of which had calved within from 14 to 

 44 days previous to the experiment. The difference in the relative 

 amounts of nutrients was brought about by feeding corn-and-cob meal 

 containing 3.24 per cent crude fat, 9.66 per cent crude protein, and 76.17 

 per cent carbohydrates (exclusive of cellulose) in the dry matter, vs. 

 gluten meal containing 11.88 per cent fat, 21.58 per cent protein, and 

 56.08 per cent carbohydrates in the dry matter, the coarse fodder being 

 the same in kind and amount at all times (12 pounds corn fodder and 4 

 pounds clover hay per animal daily). The experiment extended from 

 March 22 to June 9, and included three 21-day periods, separated by 

 transition periods of 10 days each. 



Cows Nos. 21 and 22 each received daily in addition to the coarse 

 fodder, 12^ pounds of corn-and-cob meal in the first period, 10 pounds 

 of gluten meal in the second period, and 13 pounds of corn-and-cob meal 

 in the third period. The order was reversed in the case of cows 33 and 

 65, 10 pounds of gluten meal per animal being fed in the first and third 

 [)eriods, and 12^ pounds of corn-and-cob meal in the second period. 

 The uneaten coarse fodder was weighed back, but all except the corn 

 fodder, a small quantity of which was left, was eaten clean, without 

 regard to the kind of grain fed. The milk of each cow was sampled 

 every morning and evening, the samples being preserved for from 4 

 to 7 days and the solids determined in the composite samples at the 

 end of that time by a gravimetric method, and the fat by the Babcock 

 centrifugal method. The analyses of the milk, therefore, represent 

 the average composition of the milk of each milking during the entire 

 period instead of the composition on any particular day. 



The analyses of the corn-and-cob meal, the gluten meal, and the milk 

 and statements as to the total amounts of food consumed, the total 

 yield of milk, of solids, and of batter fat, and the pounds of fat per 1,000 

 pounds of soUds-not-fat, are tabulated for each animal in each period. 

 From these data the total amounts of nutrients in the grain rations con- 

 sumed during each period (the only variable food) have been calculated 

 lor each ajiimal. ami lliese. io-ethei' witli the lotal yields of milk and of 

 tal (luring each period and tiie aveiage <'ouiposjtion of the milk, are 

 given in the following table: 



