FOODS ANIMAL PUODU('TION. 



1071 



"The results of :i consideriihlc miinhei' of <li<>-esti()n experiments 

 with mixed diet o-ive averages for coeffieieuts of avaihibility as foHows : 

 For protein. !»2 p(>r cent; fats, U5 per cent, and carbohydrates !>T per 

 cent." 



Studies of dietaries of college students and of members of 

 families of professional men, ^\'. (). Aiwatku and K. I). AIii.Np:ii 

 {(oiiH,'<'flruf Sfnri'x Sf,i. Rj>f. ISUU^ pp. /:.^.My/,9).— Details are reported 

 of a dietary study with coiU'o-e students, a (*heniist*'s family, and a 

 chemist. The students and the chemist were young Juen in good 

 health. The sul)ject of one of the studies, No. 31«), l>oarded hin)self 

 during- a sununer \'acation. Most of the foods eaten were such as 

 could b(> purchased already prepared or canned. A very considerable 

 nund)er Avere of vegetable origin. In the dietary study of the chemist's 

 family, No. 317, the special object was to determine whether salt cod- 

 iish and dried beans prepared in different wa3^s could be used with 

 satisfaction as sources of })rotein in place of a considerable portion of 

 the meat ordinarily used. The results of the dietary studies follow: 



Areraijc rcsalts of dieUiry xtadies; qaanlities coiisanicd per timnjyer day. 



Collega student (No. SKi)-. 

 Chemist's family (No. 317) 

 CiillcyestiKk'Ut (No. 318).. 

 ColU'Kr student (No. 319).. 

 College student (No. 320).. 



Chemist (No. 321) 



College student (No. 322).. 



Cents. 

 31.7 

 20.8 



Grams. 

 145 

 100 

 139 

 91 

 104 

 126 

 160 



Fat. 



Grams. 

 115 

 130 

 138 

 98 

 98 

 138 

 135 



Carbo- 

 hydrates. 



Grains. 

 522 

 380 

 COl 

 422 

 426 

 395 

 351 



Fuel 

 value. 



( 'alories. 

 3, 810 

 3,180 

 4, 315 

 3, 105 

 3,085 

 3,420 

 3,350 



Investigations on the metabolism of matter and energy of full- 

 grown steers on a maintenance and on a productive ration, O. 

 Kellnek, a. Kohlek, p:t al. {Lcmdw. Vers. Sf((t.^ 5-J {lUOO)^ pp. 

 JTH- -^7-^). Continuing- the experiments with steers on the metalmlisni of 

 matter and energ-}^ at the Mockern P]xperiment Station (E. S. R. ,10, p. 

 669), the authors report in detail a considera))le number of investigations. 

 These include four series, agg'regating- 3U individual experiments of 

 an average duration of 14 days. A total of 159 respiration experi- 

 ments wer*^ made, each of 24 hours' duration, with the Pettenkofer 

 respiration apparatus. In the tirst series the ration consisted of gluten 

 and starch; in the sei-ond, of gluten, starch, and oil; in the third, of 

 meadow hay, oat straw, starch, oil, and molasses; and in the fourth, of 

 meadow hay, oat straw, starch, extracted rye straw, and molasses. 

 The composition and digestibility of the ration was studied; record 

 was made of the water consumed and its content of carbon dioxid; the 

 urine was analyzed; the carbon in tiie gaseous excretory products, 

 the nitrogen, and carbon balance wtu'e determined, as well as the fuel 



