476 EXPERIMENT STATION RECOED. 



DAIRY FARMING— DAIRYING. 



Lectures on dairying, B. Boggild { Mwlkeritid., 23 (1910), lios. 35, pp. 

 755-766; 37, pp. 80J/-812; 39, pp. 857-867; J/l, pp. 903-909) .—These lectures on 

 the demands of milk hygiene and its effect on milk prices, the Danish cow test- 

 ing associations, the Copenhagen milk supply, and dairy legislation in Denmark 

 were delivered in the United States during the author's visit in the summer 

 of 1910. 



Dairy bacteriolog'y, A. Wolff (Centhl. Bald, [rfc], 2. AM., 28 {1910), No. 

 16-19, pp. 417-422). — ^A review of important contributions to our knowledge of 

 dairy bacteriology which appeared in German iieriodicals in the past few years. 



Has the dry matter in different root crops the same feeding value? N. 

 Hansson (Mcddel. Centralanst. Forsuksv. Jordbriiksomrddet, 1910, Ko. 34, PP. 

 69). — An account of a series of experiments with milch cows, conducted in 

 1908-1910 at 2 Swedish dairy farms, in which the feeding values of mangels, 

 ruta-bagas, turnips, and carrots were compared in rations for dairy cows. 



Complete chemical analyses were made of all feeds which the cows re- 

 ceived during the trials. Analyses of the different root crops showed but little 

 variation in dry matter, with the exception of the sugar content, and that the 

 digestible protein of mangels, fodder beets, and ruta-bagas was about 0.4 to 0.5 

 per cent. 



The average percentage of dry matter in the different varieties of root crops 

 was as follows : Mangels, Eckeudorf 12.10, Regia 11.95, Golden Tankard 11.82. 

 Barres 11.99, Siirimmer 14.40, and Light Red Bottle 1.5.G1 per cent, an average 

 of 12.99 per cent ; ruta-bagas, Yellow Swedish 13.48 and Baugholm 11.19 i>er 

 cent, an average of 12.34 per cent; turnips, Bortfeld 8.47 and Oestersundom 

 10.09 per cent, an average of 9.28 per cent ; and carrots, 13.GT per cent. 



The feeding experiments were conducted according to the Fjord group system, 

 6 cows being placed in each group. The average daily allowance of roots in 

 the rations of the cows ranged in these experiments from 15.5 kg. (Light Red 

 Bottle mangel) to 49.2 kg. (Bortfeld turnip), the average amounts of dry sub- 

 stance furnished in the form of roots being about 2.4, 3.8, 2.4, and 3.6 kg. per 

 cow daily for the 4 trials. 



The general couclusion is drawn that no difference could be traced as re- 

 gards the influence of the several root crops on the milk yields or the- live 

 weights of the cows, or on the fat contents of the milk produced, and that the 

 dry matter in the various root crops may, therefore, in general be considered of 

 equal value for milk production. 



Dairy cattle, J. H. Gbisdale (Canada Expt. Farms Rpts. 1910, pp. 64-78). — • 

 This contains records of the station herd in 1909 and details of the methods of 

 feeding practiced. Brief notes on feeding experiments are also reported. 



Should one produce butter fat with milk high, or low in fat content? 

 K. Akerberg (Dciit. Landw. Fresse, 37 (1910), No. 100, pp. 1093, 109-',; MUeh 

 Zfg., 40 (1911), No. 7, pp. 65-67). — The view is suggested that when feeding 

 stuffs rich in protein ai'e high in price a cow which gives a small quantity of 

 rich milk may be more profitable than one which gives a large yield of milk 

 containing a small percentage of fat, because in the latter case a large amount 

 of surplus protein must be secreted. According to tables presented, the average 

 cow of the East Friesian breed must produce 281.4 kg., the Angler breed 

 256.1 kg., and the Simmental breed 224.9 kg. of solids-not-fat in order to produce 

 100 kg. of fat. Consequently, the East Friesian cow will be required to produce 

 56.5 kg. more of the unnecessary solids-not-fat than the Simmental cow, and 

 this can not be done without consuming more digestible protein than the cow 

 giving milk containing a high fat content. 



