DAIEY FARMING DAIRYING. 487 



Two hundred eggs a year per hen; how to get them, K. L. Wakkex ( Wolj'e- 

 boro, X. H.; Author, 1902, pp. SO, _ti(j>^. 7). — A general disruyyioii of egg production 

 and poultry raising for profit. 



The iron content of hens' eggs, C. IIaktunxi (Ztschr. BloL, 4-i {100-2), No. 2, 

 lip. 195-212). — Feeding experiments reported in detail led to the conclusion that it 

 was not possible to materially increase the iron content of eggs by supplying a diet 

 rich in iron. 



The production of oxygen in hens' eggs, K. A. Hassei.isai.ch {Skand. Arch. 

 J'hytiiol., l^J {1902), Xo. 1-2, pp. 170-192). — Respiration exj)eriments with fertile and 

 infertile eggs are reported. 



DAIRY FARMING— DAIRYING. 



Some feeding experiments w^ith cow^s, H. J. rATTEKS(jx {Maryland Sta. Bid. 

 84, pp- 121-154). — Four series of experiments conducted at the station from 1896 to 

 1901 are reported in detail, and a paper upon the production of protein feeds upon 

 the farm, including a ju;mber of rations for dairy cows, is appended. 



Comparison of an e.vclusive corn meal ration -wilh a balanced ration of mixed grains 

 (pp. 121-126). — Corn meal and a mixture of corn meal, wheat bran, and gluten meal 

 (5:3:2) fed in equal quantities were compared with 6 cows. For the most part the 

 rations were fed alternately by lactation periods. The results in all cases were con- 

 sidered in favor of the mixed grain ration, not only as regards production and profit, 

 but in some instances as regards the health of the cow. 



Mired grain rations of different degrees of richness in protein (pj). 126-135). — Fourteen 

 cows which had received uniform treatment for some time were divided into 2 

 equal lots and fed experimentally for about one year, during which time the nutri- 

 tive ratio for one lot was gradually increased to 1: 7.9 and that for the other lot was 

 decreased to 1:5.2. The results, which are given in full in tabular form, seem to 

 indicate that under Maryland conditions a ration having a luitritive ratio between 

 1:6.9 and 1:7.9 is the most economical for milk production. Tlie subject is to be 

 investigated further in connection with the study of the different sources of protein. 



The neiv com product as rougliage for cons (pp.. 136-142). — Six cows were fed soil- 

 ing corn for 2 weeks and the new corn product for the 2 weeks following. During 

 the second period the total yield of milk was increased 28 lbs. and the yield of butter 

 17.2 lbs., the amount of grain consumed, however, being 29 lbs. greater. The new 

 corn product was also compared with mixed hay and shredded corn fodder in an 

 experiment lasting 4 months in which 6 cows remained for the whole period. The 

 new corn product was fed during the first and third months of the experiment, hay 

 during the second month, and corn fodder during the fourth month, the results 

 showing a maximum yield of butter with a minimum consumption of grain feed when 

 the new corn product was used. The yield of miHi, however, was not so large as on 

 mixed hay. 



Test of sugar feed ration (pp. 142-146). — A test was made of a proprietary feeding 

 stuff reported as made up of ground fodder, grain, and beet molasses, and showing 

 the following composition: Water 11.80, protein 16.97, fat 1.87, nitrogen-free extract 

 51.25, crude fiber 12.34, and ash 5.77 per cent. Seven cows were used in the test, 4 

 Vjeing fed exclusively on the sugar feed for 16 days, and 3 on a grain and grass ration. 

 The rations were then reversed and the feeding continued for a second period. The 

 sugar feed was not eaten very readily by some of the cows. Those that did, how- 

 ever, shoAved an increase in the yield of milk in changing to this ration and a decrease 

 when it was discontinued, indicating, according to the author, that this feed has 

 considerable value as a food for cows and is capable of serving as a complete ration. 



Experiments on the feeding of dairy cows, L. Geandeau {Jour. Agr. Prat., n. 



