72 EXPERIMENT STATION RECORD. 



In none of these values were there any siguificaut differences between lots 

 2 and 3. There was some indication that the weight of the heart varied in- 

 versely as the amounts of protein consumed. 



The weights of the bones varied practically directly with the live weights 

 of the animals. There was little difference in the lengths and diameters. The 

 thickness of the walls of the leg bones and the marrow spaces were in propor- 

 tion to the protein fed, the low-protein fed pig having the thinnest wall and 

 the largest marrow. The breaking strengths and the moduli of rupture of the 

 bones of the pig of lot 1 were lower than those of the other lots, while the 

 average value for the section moduli, a measure of the distribution of the bone 

 materia], indicated that the structure of the bones was not affected by the 

 amount of protein consumed. 



It is concluded from these observations that the feed allowance given lot 1 

 was not sufficient for the normal nutrition of young growing pigs, probably .be- 

 cause the ration either did not contain enough of the right kind of protein or 

 did not yield enough energy. The allowance given lot 2 was sufficient, and the 

 larger protein allowance given lot 3 exerted but little apparent influence. 



A study of the ash content of growing- pigs with special reference to the 

 influence of the quantity of protein consumed, R. H. Williams and A. D. 

 Emmett {Illinois 8ta. Bui. 169 {191-'/), pp. 139-159; abs., pp. 3). — Continuing the 

 work reported above by a study of the ash content of these pigs, it is concluded 

 that " variations in the amounts of digestible protein consumed from 0.32 to 0.94 

 lb. per 100 lbs. live weight per day, do not influence significantly the percent- 

 ages or distribution of the total or water-soluble ash in the bodies or the parts 

 of the bodies of growing pigs. The total ash In the bodies of pigs 40 to 43 weeks 

 old is distributed among the parts as follows: Somewhat more than four-fifths 

 in the skeleton, about one-ninth in the boneless meat of the carcass, and about 

 one-sixteenth in the offal, blood, and the composite of the jowl, leaf, and in- 

 testinal fats combined. Of the water-soluble ash, somewhat less than three- 

 fifths is to be found in the boneless meat of the carcass, about one-third in the 

 offal, the blood, and the composite of the jowl, leaf, and intestinal fats, and 

 about one-twelfth in the skeleton. 



" The percentages of total ash in the bodies and the parts of the bodies of pigs 

 40 to 43 weeks of age are significantly different from the corresponding percent- 

 ages for pigs 18 weeks of age. The offal and carcasses of the younger animals 

 contain practically twice as much as those of the older pigs, while the skeletons 

 contain only about three-fourths as much. The rations of the total ash in the 

 boneless meat to the total ash in the skeletons of the older animals are also 

 distinctly different from the corresponding rations for the younger animals. 

 As the pigs become older the ratio of total ash in the boneless meat of the car- 

 cass to total ash in the skeleton decreases, while the ratio of total ash in the 

 entire body to the total ash in the skeleton remains approximately constant." 



A bibliography is appended. 



A study of the phosphorus content of growing pigs with special reference 

 to the influence of the quantity of protein consumed, R. II. AYilliams and 

 A. D. Emmett {Illinois Sta. Bui. 171 (1914), pp. 205-230, figs. 5; ais., pp. 4).— 

 Continuing the work reported above by a study of the phosphorus content of the 

 pigs, it is concluded that " variations in the amounts of digestible protein con- 

 sumed, from 0.32 lb. to 0.94 lb. per 100 lbs. live weight per day, do not influence 

 significantly the percentages or distribution of the total, the water-soluble, or 

 the water-soluble inorganic phosphorus in the bodies or the parts of the bodies 

 of growing pigs. The total phosphorus in the bodies of pigs 40 to 43 weeks of 

 age is distributed among the parts as follows : About four-fifths in the skeleton, 



