908 EXPERIMENT STATION RECORD. 



similar values were 82.7 oz., 4 lbs., and 6.2 cts. The animal food supplied 60 per 

 cent of the protein and 38 per cent of the dry matter of the ration and the ash made 

 up 25 per cent of the dry matter. 



With lot 4 the average gain was 78.7 oz., the dry matter eaten per pound of gain 

 and the cost being 4.2 lbs. and 7 cts. The animal food constituted about 80 per cent 

 of the total protein and 59 per cent of the dry matter eaten, 26 per cent of the dry 

 matter being made up of ash constituents. 



It was found that, generally speaking, "During the first few weeks growth was 

 more rapid and equal growth made for less food (even at a lower cost for food) under 

 a ration in which 60 per cent of the protein was obtained from animal food than under 

 rations having respectively 20, 40, and 80 per cent of the protein derived from this 

 source. 



"Later growth was made at somewhat more economical expenditure of food under 

 the '20 per cent' ration, but was slower. Under the rations containing larger propor- 

 tions of animal food, marketable size was reached about two weeks sooner. 



"Results, on the whole, favored the use for the first few weeks of the ration in 

 which 60 per cent of the protein came from animal food, and later those containing 

 larger and increasing proportions of grain foods." 



How much meat shall ducks eat ? F. H. Hall and W. P. Wheeler (New York 

 State Sta. Bui. '259, popular ed., pp. 6.) — This is a popular edition of the above. 



Guinea fowls; pea fowls (Waterville, N. Y.: Columbia School of Poultry Culture, 

 1904, pp. 8). — A concise summary of data regarding the feeding, management, and 

 uses of guinea fowls and pea fowls. 



A successful brooder house, F. II. Stoneburn {Connecticut Storrs Sta. Bui. 33, pp. 

 10, figs. 7). — A station brooder house is described, which has proved very successful. 



The house is built on a side hill, and its essential feature is an elevated chick floor, 

 which is 3.5 ft. above the level of the alley along the side of the building. This 

 arrangement is secured by taking advantage of the hillside for the level of the chick 

 floor and digging out the space for the alley as much as necessary. If built on the 

 level the author notes that special attention must be paid to securing good drainage 

 in the alley, which would then have to be dug below the surface. The elevated 

 chick floor effects a saving in the amount of heat required to maintain a given tem- 

 perature, since it diminishes the inclosed air space, which must be heated, and 

 brings the chicks near the ceiling, the warmest part of the room. 



Tests have shown that in cold weather the temperature at the level of the alley 

 floor was 14° lower than at the chick floor. By building on a hillside the amount 

 of side wall exposed to the weather is considerably diminished, which is an advan- 

 tage from the standpoint of heating. The plan followed has a disadvantage in that 

 the chick pens were low, and so it was rather inconvenient for the attendant to enter 

 them when it was necessary. 



DAIRY FARMING DAIRYING. 



Cooperative experiments with milch cows, 1903-4, H. Goldschmidt, C. M. 

 Kjeldsen, and J. A. Lemming {Copenhagen, 1904, pp. 147). — This is a full account 

 of the second series of feeding experiments with milch cows conducted on Danish 

 dairy farms. (For abstract of the first series, see E. S. R., 16, p. 504.) The aim of 

 the investigations was to determine the effect of feeding different amounts of protein 

 and carbohydrates upon the live weights and the production of milk and butter fat 

 of the cows, and also to ascertain the effect of these variations upon the net profit of 

 production. 



The main principle of the system of feeding adopted was to supply the individual 

 cows appropriate rations in proportion to their live weights and milk production. 

 A maintenance ration of 0.7 lb. digestible protein and 7.0 lbs. digestible calculated 

 carbohydrates per 1,000 lbs. live weight was supplied in all cases, and in addition a 



