1917] DAIEY FAEMING — DAIRYING. 169 



0.006 to 0.025 in whole roots, from 0.007 to 0.021 in poeled root.s, and from 

 0.015 to 0.042 in the peel of roots. In samples of the waste from cassava roots 

 used in the manufacture of starch there was found to be 0.003 per cent of 

 hydrocyanic acid in the waste from whole roots and 0.0008 per cent in the 

 waste from peeled roots. These results indicate that cassava waste, if boiled 

 before feeding, is safe for use as a hog feed. The author cautions against the 

 use of cassava itself, however, for feeding unless the finely-divided roots are 

 thoroughly boiled with two or three changes of water. 



Stallion enrollment. — VI, Report of stallion enrollment work for the year 

 1916, with lists of stallions and jacks enrolled, H. E. McCaktney (Indiana 

 Sta. Cite. 58 (1011), pp. 182, figs. 25).— This reviews the work of the stallion 

 enrollment board of the State during the year, gives facsimile reproductions of 

 the certihcates of registry recognized by the State stallion enrollment law, and 

 lists the stallions and jacks enrolled in the State by breeds and counties. 



Stallion registration and licenses for the year 1916, W. L. Carlyle, L. L. 

 Lewis, and W. L. Fowlek (Oklahoma Sta. Circ. 42 (1911), pp. XVIII-\-105). — 

 This first annual report of the Oklahoma State Live Stock Registry Board con- 

 tains the test of the State live stock registration law and rules and regulations 

 adopted by the board for its enforcement, and gives lists by breeds and counties 

 of the stallions and jacks licensed in the State during 1916. 



DAIRY FARMING— EAIRYI17G. 



The mineral metabolism of the milch cow; second paper, E. B. Fokbes, 

 F. M. Beegle, et al. (Ohio Sta. Bui. 308 (1911), pp. 451-481). — The objects of 

 the experiments reported in this bulletin, in continuation of those already noted 

 (E. S. R., 35, p. 481), were to learn whether mineral equilibrium can be main- 

 tained on rations containing the maximum amounts of mineral nutriment 

 obtainable in common practical feeds; to determine the effects of large addi- 

 tions to these rations of calcium, magnesium, and phosphorus in supplemental 

 form, as inorganic salts ; and to ascertain the reason for the limited utilization 

 of the mineral nutrients during ordinarily liberal food consumption. 



Six Holstein cows were used in collection periods of 20 days, separated by 

 ten-day intervals on the ration of the collection period to follow. The cows 

 were all in their second, third, or fourth period of lactation. None was bred 

 during this experiment. They were fed and milked four times daily at six-hour 

 intervals. The milk yield varied from 38.7 to 58.35 lbs. per head daily. 



In order to supply maximum amounts of calcium, magnesium, and phosphorus, 

 the rations were based on a leguminous roughage (either clover or alfalfa 

 hay), corn silage, cottonseed meal, linseed meal, and wheat bran. Corn meal 

 was used as the principal source of carbohydrate. During the first period 

 of the experiments the variable portion of the rations was the roughage — three 

 cows receiving alfalfa hay and three clover hay. During the second period 

 three of the cows received a double portion of salt. The rations were further 

 varied during this period by giving calcium carbonate to two cows and bone 

 flour to two cows. 



Detailed tabular data are given of the average daily feeds consumed, milk 

 produced, and live weights of cows ; percentage composition and weight of 

 constituents of feeds and milk ; weight of constituents of urine and feces ; 

 daily intake and balances of minerals and nitrogen ; minerals in daily rations 

 computed to normal solutions ; utilization and elimination of nitrogen ; coeffi- 

 cients of digestibility of rations; and distribution of the outgo of elements 

 among milk, urine, and feces. 



