1917] 



ANIMAL PRODUCTION. 



365 



stances ; for protein ; for starch ; for sugar ; and for fat. One of the principles 

 suggested for the planning of economical meals is that by remembering these 

 groups and having them all suitably represented in the daily diet the house- 

 keeper can easily plan attractive meals which meet the needs of the family 

 without the wasting of money or material. 



The effect of starvation on the catalase content of the tissues, W. E. Bukgk 

 and A. J. Neill {Amer. Jour. Physiol., J^S {1917), No. 1, pp. 58-61). — Data are 

 submitted which show that during starvation the catalase content of the heart 

 (rabbit) remains normally high, while that of the fat and skeletal muscles is 

 greatly decreased. 



From the results it is concluded that the heart is not autolyzed during starva- 

 tion, " because oxidiation in this organ remains normally intense and thus pro- 

 vides for this oxidation of the autolyzing enzyms and the maintenance of the 

 normal balance between oxidation and autolysis. On the other hand the fat 

 and skeletal muscles are autolyzed during starvation, because of the decreased 

 oxidation which leaves the autolytic enzyms free to digest these tissues." 



ANIMAL PRODUCTION. 



Some commonly neglected factors underlying the stock breeding industry, 

 R. Pearl (Maine Sta. Bui. 258 (1911/), pp. 28, fig. 1). — In addition to an out- 

 line of the importance of the live-stock breeding industry as a business (E. S. R., 

 35, p. 772), the author discusses a number of factors which make for success 

 in the business of breeding, including the test of progeny and its implications, 

 continuity of purpose in breeding, the superiority of the pure bred, and the im- 

 portance of the man himself in the successful breeding enterprise. 



Steer feeding experiments, W. H. Tom have, B. O. Seveeson, and P. Ges- 

 LAUGH (Pennsylvania Sta. Bui. lJf5 (1917), pp. S-20, figs. 3). — Summarized re- 

 sults are given of feeding experiments with steers conducted during the three 

 winters 1913-14 to 1915-16, inclusive. The work of 1913-14 has already been 

 noted (E. S. R., 32, p. 864). The six lots of 12 steers each were mostly two- 

 year olds, and averaged about 900 lbs. at the beginning of the tests. The feeds 

 used and some of the results secured during the two periods of 56 and 84 days, 

 respectively, of each test are given in the following table : 



Three-year summary of steer-feeding experiments. 



» 1913-14 only. 



» 1914-15 only. 



• 1915-16 only. 



