1918.] ANIMAL PEODUCTTON. 577 



resistant to disease than tlie native. The Black Orpington cross laid more eggs 

 than the White Leghorn cross, and the latter more than tlie native. 



Satisfactory method of pedigreeing fowls, A. G. Philips {Rel. Poultry Jour., 

 2i (1918), No. 12, pp. ll(n, llOS, 1171 llt5, 1176, figs. 5).— An outline is given 

 of the method used at the Indiana Experiment Station for pedigreeing chicks 

 and recording breeding data. Samples of breeding records are illustrated. 



Feeding for egg production, H. Atwood (West Virginia Sta. Circ. 27 {1917), 

 pp. 32). — This circular summarizes results of experiments by various investi- 

 gators on feeding for egg production. The subjects treated include the amount 

 of feed, th-i composition, combination, and digestibility of various feeds and 

 feeding methods. The rations now used at several experiment stations and col- 

 leges are given. A bibliography is appended. 



Certain characteristics of hen eggs, H. Atwood and C. E. Weakley, jb. 

 (West Virgi7iia Sta. Bui. 166 (1917), pp. 3-35). — This investigation, carried on 

 during two years with two pens of 20 each of White Leghorn pullets, sought to 

 correlate certain differences in the eggs laid. One pen was fed corn products 

 with beef scrap and the other wheat products and beef scrap. Tables show in 

 detail the record of each hen and certain physical variations in the eggs. 



The results showed that the heavier the egg the heavier the yolk, but its 

 percentage to the whole egg was less. With eggs laid in cycles — that is, one 

 each day for two days or more until a day is missed — the first egg was usually 

 heaviest, decreasing in total weight and weight of yolk until the cycle was 

 broken. In general the yolk had a lessened percentage decrease. 



The eggs of individual hens varied widely in total weight, weight of yolk, 

 and average percentage of yolk to total egg. 



The second year the amount of beef scrap was increased, the results indicating 

 that a considerable amount of animal protein tends to weaken the viteline 

 membrane. During both years the eggs and yolks of the wheat-fed fowls av- 

 eraged somewhat heavier than those of the corn-fed. With the smaller amount 

 of beef scrap in the ration the peirentage of yolk was greater with the corn- 

 fed fowls, but with the larger amount of beef scrap it was larger with the 

 wheat-fed. During the second year the weight of eggs and yolks and the per- 

 centage of yolk were greater than the first year. 



The care, sanitation, and feeding of foses in captivity (Canada Dept. Agr. 

 Bui. 20 (1916), pp. 20, figs. ^). — The great demand, especially for certain grades 

 of pelts, has resulted in the increased production of foxes in captivity. This 

 compilation serves to give information regarding the methods now employed by 

 fox breeders, and to offer suggestions based partly on experience and partly 

 on the principles involved in the breeding of similar animals. 



The location of the ranch is described and plans of runs and pens given. 

 About 2,500 sq. ft. of run should be allowed for each pair of foxes. The plant 

 should be so constructed as to keep similar animals away on account of an- 

 noyance to the foxes and the liability of bringing in disease. 



The proper feeding of foxes of different ages is detailed and an analysis of 

 the milk of the fox given. 



The fur of the silver fox is so highly prized because of its color that an effort 

 is being made to fix this color by breeding, but as yet no definite result can be 

 said to have been attained. It is a problem that the breeders must work out, 

 depending upon the furriers to grade their product and to keep them in touch 

 with the demands of fashion. 



A description of parasites and di.seases is given. 



Rabbit and cavy culture: A complete and oflB.cial standard of all rabbits 

 and cavies, W. F. Roth and C. T. Coenman (Sellersville, Pa.: Item PuhUsMng 

 Co.. 1916, rev. ed., pp. 134, fiffs. 24). — A description of breeds and methods of 

 breeding. 



