770 EXPERIMENT STATION RECORD. [Vol.35 



fish meal laid an average of 113.1 eggs per hen in 32 weeks, and those fed a 

 similar ration but containing beef scrap instead of fish meal averaged 128.4 

 eggs per hen. The hens ate the beef scrap a little more freely than they did the 

 fish meal. No differences were noted in regard to size or flavor of eggs or the 

 health and weight of the fowls. 



In comparing fish meal with digester tankage (60 per cent protein) as supple- 

 ments in a ration for pigs, F. G. Ashbrook reports that 12 grade Berkshire pigs 

 averaging about 52 lbs. per head were divided into two lots and fed for 112 

 days, beginning January 19, 1915. The 8 pigs fed corn meal, middlings, and 

 tankage (4:4:1) made an average daily gain per pig of 1.25 lbs. at a cost of 

 5.58 cts. per pound of gain, the average grain eaten daily per pig being 4.53 lbs. 

 The 4 pigs fed corn meal, middlings, and fish meal (4:4:1) made an average 

 daily gain per pig of 1.31 lbs. at a cost of 5.22 cts. per pound of gain, the average 

 daily grain consumption per pig being 4.8 lbs. 



At the close of the above period, May 11, 1915, the pigs were put on a ration 

 for the fattening period, which lasted 28 days. The 4 pigs fed fish meal were 

 continued on the same rations, and made an average daily gain per pig during 

 the fattening period of 1.91 lbs. at a cost of 6.04 cts. per pound of gain and a 

 daily grain consumption of 8.06 lbs. The 8 pigs previously fed tankage were 

 divided into two lots of 4 pigs each. One of these lots was finished on a ration 

 of corn meal and fish meal (9:1). They made an average daily gain per pig 

 of 2.16 lbs. at a cost per pound of gain of 5.35 cts., their daily consumption of 

 grain being 8.54 lbs. per pig. The other lot was fed corn meal and tankage 

 (9:1). Their average daily gain was 2 lbs. per pig at a cost of 6.76 cts. per 

 pound of gain, and they consumed 8.13 lbs. of grain daily per pig. In figuring 

 the cost of gains in these tests, corn meal was valued at $27 per ton, wheat 

 middlings at $30 per ton, digester tankage at $50 per ton, and fish meal at $35 

 per ton. It is stated that in these tests the hogs were extremely fond of the 

 flsh meal. 



(Jeneral directions for the manufacture of fish meal, opinions of stock-food 

 manufacturers in reference to its use in the trade, and an estimate of the 

 amount of raw material available for fish meal are given. 



Cause and prevention of rancidity in palm nut kernel cake, R. B. Caxdee 

 {Jour. Agr. Sci. [England], 7 (1916), No. 4, pp. 47M72).— The author con- 

 cludes from his studies that palm nut kernel cake, if kept dry and cool, remains 

 Bweet for at least ten weeks. If moist and warm it becomes rancid in a few 

 days. The cake contains a zymogen which under the influence of warmth and 

 moisture forms a lipase, which then turns the oil rancid. The lipase can be 

 destroyed by heating the moistened cake to 70° C. (158° F.) for a short time. 

 If the dry cake is heated the zymogen is usually destroyed, but dry heating 

 is not so certain to destroy it as heating when moist. 



Studies on the acidity of various feeding stufEs, L. Wilk (Ztschr. Landw. 

 Versuchsw. Osterr., 18 (1915), No. 8-9, pp. 485-558) .—Data on the acidity of 

 the following feeding stuffs are given : Pumpkin-seed cake and bran, sunflower 

 seed cake, rape seed cake, linseed cake, peanut cake, molasses feed, sesame 

 cake, rice meal, coconut cake, cotton-seed meal, palm-kernel cake, corn germs, 

 dried beet foliage, potato pulp, and blood, meat, and fish meal. Methods of 

 determining acidity are discussed. 



Tricolor inheritance. — I, The tricolor series in guinea pigs, H. L. Ibsen 

 {Genetics, 1 {1916), No. S, pp. 287-309, figs. 4)-— In this paper, reporting work 

 at the Wisconsin Experiment Station, the factors more or less directly con- 

 cerned with tricolor inheritance in guinea pigs are described and their inter- 

 relations shown. 



