572 EXPERIMENT STATION RECORD. [Vol.40 



The report is preceded by the text of the Texas Feed Control Law, a state- 

 ment of standards and definitions of feed products adopted as legal by the sta- 

 tion, rulings made under the law by the station authorities and rulings of the 

 United .Stales Food Administration affecting feeding stuffs. 



DAIRY FARMING— DAIRYING. 



The relation of the quality of proteins to milk production. III. IV. E. B. 

 IIakj and G. C. Hr.\ii'Hi;KY [Jour. Biol. Chem., M [1911), No. J. pp. ■))■'> )•>'■■ 

 figs. 7; 35 (1918), No. 2. pp. SSI 888, figs. 5). — In these two contributions from 

 the Wisconsin Experiment Station the authors report experiments during 1916 

 :iik1 irnT <m the availability i"<»r milk production of proteins derived from eom- 

 binations of legume hays and nitrogenous supplements, in continuation of their 

 previous studies (E. s. it.. 36, p. • ".7 1 1 <m com stover combinations. 



In both years the plan was to feed each Bupplemem for a period of four 

 works and then change immediately to another one. The basal ration was 

 kept constanl in relation to its source and proportion of nutrients in the differ- 

 ent periods of each year. The concentrate for each period was mixed with 

 starch in such a proportion that the plane of nitrogen intake (nutritive ratio) 

 ami the net available energy from the total ration would be uniform throughout 

 the several periods of a particular year. The nutritive ratios were wide so &8 

 io secure zero or slightly negative nitrogen balances and thereby eliminate 

 the disturbing factor «»f tissue building. Cows of good milking capacity and 

 not pregnant were selected. Beginning a week after a change of concentrate, 

 urine and feces were collected for dally nitrogen analysis. Weekly analysis 

 was also made of a seven-day composite sample of milk from each animal. 

 The measure of a ration's efficiency thai was adopted i^ the percentage of tbe 

 absorbed aitrogen not eliminated in the urine, a measure that is held to correct 

 sufficiently for slight Btorage of nitrogen or slight use of tissue proteins. The 

 experiments were carried out during the winter months. Complete analytical 

 daia are given in the authors' tables for each animal separately. 



In the 1916 experiment reported in Study III the experimental subjects were 

 three .Jersey COWS ion,. ,i grade), giving respectively about .''.4. 15, and 28 lbs. 

 of milk daily. The ration was If, per cent red clover hay. 56 per cent corn 

 Silage, 1- per cent corn meal, .and 16 per Cent a mixture of supplement and 

 Starch, with a nutritive ratio of 1:8.5. Proteins constituted about 12 per 

 cent of the dry matter consumed. Fifty Ihs. of the ration furnished 2.2 lbs. 

 of digestible protein and from lit. PI to 20 18 therms. About 40 per cent of 

 the digestible protein was derived from the supplemental concentrates. In tbe 

 1917 experiment reported in the fourth study, two grade Cuernsrvs and a pure- 

 bned Jersey were used. The daily milk yields at the start were 22, 2S. and 24 

 IbS., respectively, for the cows numbered 1, '2, and 3. The ration was 14 per 

 cent alfalfa hay. 56 per cent corn silage, 12 pet eenl corn meal, and IS per cent 

 a mixture of starch and supplement. The nutritive ratio was fixed at 1:8.4 

 On the dry basis total protein constituted 10 per cent. Fifty lbs. of the ration 

 furnished 2,.">2 lbs. digestible protein, about :!7 per cent Of which came from the 

 supplements, and the available energy varied from 20.58 to 20.76 therms. 



In the clover hay experiment many of the twelve weekly nitrogen balances 

 tabled for each supplement were positive. When gluten feed was given, five 

 balances were positive and one was zero. With Unseed meal 11 were positive. 

 with distillers' grains in, and with cottonseed meal ;>. This result is in marked 

 contrast to the condition found in the corn stover experiment. Gluten feed in 

 conjunction with clover hay caused no sudden increase in urinary nitrogen such 



