ANIMAL PRODUCTION. 773 



making the maintenance experiment. The results also indicate that the main- 

 tenance requirement of. pigs which previously have been kept on a low nutri- 

 tive plane may be reduced to the following weights of nutrients per 100 lbs. live 

 weight: Digestible crude protein. 0.10 lb.; digestible carbohydrates, 0.25 to 0.4 

 lb. ; digestible ether extract, 0.03 lb. The calculated energy requirement for 

 the above maintenance ration on the same basis would be about 1.12 therms." 



Portions of the above work have been previously reported (E. S. R., 12, p. 

 77; 20, p. lOGS; 22, p. 574; 26, p. 268). 



Swine management in Texas, A. K. Short {Texas Dcpt. Agr. Bui. 31, 191S, 

 pp. SO, figs. 3). — In this bulletin the author outlines the opportunities for 

 successful swine raising in Texas, and reports an experiment carried on by a 

 packing-house firm to determine the value of Kafir corn and milo maize as a 

 hog feed as compared with Indian corn. 



In this experiment the lot of shotes fed on equal parts of ground milo maize 

 and Kafir corn, together with tankage, showed an average daily gain of l.S 

 lbs. against the corn-fed hogs' gain of 1.57 lbs. The hogs ate more of the Kafir 

 feed and a little more tankage, but " the net advantage in the matter of profit- 

 able feeding was with the Kafir hogs." 



There is included in this bulletin a very thorough discussion of possible crop- 

 ping systems suited to southern conditions; also plans for 3, 4, and 5 year 

 rotations suited to profitable pork production. 



Bacon for export, E. J. Shelton (Agr. Gaz. N. S. Wales, 24 (1913), Nos. 1, 

 pp. 42-48; 8, pp. 693-700). — This article treats in detail of the bacon type of 

 hogs, their feeding, killing, dressing, and curing, and the processes of chilling, 

 cutting and trimming, pickling, and storing. The author also discusses the 

 grading, shipping, and prices realized from these products. 



Biological searchlight on race-horse breeding. — IV and V, A study of the 

 correlation between racing performances and breeding value in brood mares, 

 J. B. Robertson (Bloodstock Breeders' Rev., 2 {1913), Nos. 2, pp. 81-91; 3, 

 pp. 185-197, fig. 1). — An investigation was made into the racing performance of 

 1,000 brood mares from the General Stud Book, of the dams of 175 high-class 

 performers and of the dams of 189 classic winners, to determine the correlation 

 between racing i^erformance and breeding value in brood mares. 



It is concluded that " the chance of breeding a classic winner is very much 

 greater from those mares which have racing performances to their credit. 

 Seventy-two per cent of the aristocracy of the turf . . . are from mares 

 which showed some sort of form, and over 50 per cent are from mares which 

 had considerable racing ability, and 26 per cent from mares which had great 

 racing ability ; but in the General Stud Book there are only 34 per cent of 

 mares which have shown a vestige of form. Therefore it must be clearly evident 

 that there is a very great correlation between the characters in a mare which 

 make for racing merit and her power for reproducing those characters in her 

 offspring." A previous investigation is said to have borne out these same 

 conclusions. 



Developing draft colts, W. A. Cochel and B. O. Severson (Pennsylvania 

 Sta. Bui. 122, pp. 3-13, pis. 2, figs, ii).— This bulletin reports feeding experi- 

 ments in which 4 stallion colts and 6 fillies were fed during 2 winter seasons 

 and 1 summer season. The average initial weight of these colts was 589.87 

 lbs. The average gain per colt at the end of the first winter period of 168 

 days was 244.27 lbs. ; at the end of the summer period of 196 days, 263.57 lbs. ; 

 and at the end of the second winter period of 168 days, 219.25 lbs. The average 

 daily gain for the entire period was 1.36 lbs. The initial value of these colts 

 was estimated at $912.50, and the total cost of feed and labor at $980.89. 



