ANIMAL PRODUCTION. 769 



Shetland, Orkney, Soay, Hebrides, and Man, and of the Keerie or Rocky 

 sheep of Caithness. 



Horns in sheep as a typical sex-limited character, T. R. Arkell and C. B. 

 Davenport (Science, n. ser., 35 (1912), No. 897, pp, 375-377). — Matings of 

 the sheep used and their hypothetical somatic and gametic composition are 

 presented in tabular form, and it is stated that the results agree with the 

 theory that the male is heterozygous in sex and that there is an inhibitor of 

 horn formation which is located in the sex chromosomes. 



Sheep farming in America, J. E. Wing {Chicago, 1912, 3. ed., rev. and cnl., 

 pp. 368, pi. 1, fig% 68).— X revised edition of this work (E. S. R., 19, p. 1068). 



The sheep industry in Canada, Great Britain, and United States, W. A. 

 Dryden and W. T. Ritch (Canada Dept. Agr., Branch Lire Stock Comr., Spec. 

 Rpt., 1911, Nov., pp. 187, pis. 57). — This contains data and methods of breeding 

 and feeding sheep in the different sections of Canada, Ignited States, and 

 Great Britain. There are also statistics of the world's sheep and wool in- 

 dustry, and recommendations for improving the sheep industry in Canada. 



Sheep breeding' in New Zealand, J. Linton (Jour. New Zeal. Dept. Agr., 3 

 (1911), No. 6, pp. 48-'f--iS6). — This contains data obtained from flock books of 

 each breed of sheep in New Zealand. 



Energy required for the work of digestion in sheep, W. Ustjanzew (Bio- 

 chcni. Ztschr., 37 (1911). No. 5-6, pp. .'/J7'-.i76). — The determination of income 

 and outgo of energy was made by the respiration calorimeter. 



The average energy required per minute per kilogram of live weight with 

 sheep was 12.86 calories for mastication, 3.92 calories for rumination, 21.6 

 calories for digestion in one experiment, and 22.89 calories in another test 

 containing a large amount of fiber. In all cases the rations containing a 

 large amount of hard fiber required more energy for mastication, rumination, 

 and digestion than rations containing a small amount of fiber. 



The value of fiber testing machines for measuring the strength and elas- 

 ticity of wool, J. A. Hill (Wi/oming Sta. Bui. 92, pp. 3-23, fig. 1). — A discus- 

 sion of work previously noted (E. S. R., 26, p. 570), with special reference to 

 the usefulness of the fiber-testing machine for measuring strength and elas- 

 ticity of the wool fiber. It is concluded that the great variability of the wool 

 fiber with respect to these 2 characters renders the most j^erfect fiber-testing 

 machine valueless as au instrument to be used for commercial and industrial 

 purposes as far as wool is concerned. 



The remains of swine from Friesian mounds, L. Broekema (Cultura, 2^ 

 (1912), No. 282, pp. 71-77). — Measurements of subfossil bones of swine obtained 

 from mounds in Friesia are presented in tabular form and compared with those 

 found in other places. There is also a discussion of the ancestry of European 

 swine. 



Feeding experiments with swine, K. Hofmann and J. Hansen (Landw. 

 Jahrb., JiO (1911), Ergdnzmigsb. 1, pp. 190-210). — This is a continuation of 

 earlier work (E. S. R.. 21. p. 173). Steamed potatoes and potato flakes were 

 of about equal feeding value, but the flakes produced a better quality of pork. 

 Better gains were made with barley than with rye. Jkleat meal produced excel- 

 lent gains, but was considered too expensive for economical gains. 



Feed requirement of brood sows, F. Lehmann (Jour. Landw., 59 (1911), 

 No. 3, pp. 317-363, pi. 1). — A high protein ration increased the birth rate of the 

 young and faster gains were made after birth than where sows remained on a 

 ration low in protein. 



Feeding experiments with swine, O. Kellner, F. Lehmann and J. Konig 

 (Bcr. Landir. Rcichi^awfr Inncni inoD, No. 15. pp. 71). — A report of a number 

 of miscellaneous feeding tests made at 3 different stations. The feeds tested 



