762 EXPERIMENT STATION RECORD. 



It was found tliat upon the ration used the lambs excreted in the urine only 

 from 0.2 to 0.5 per cent of the total phosphorus ingested. The forms of phos- 

 phorus excreted in the feces showed that marked qualitative and quantitative 

 changes had taken place during the processes of digestion and metabolism. A 

 large proportion of the acid-insoluble phosphorus of the feeds was converted 

 into acid-soluble phosphorus, and a large part of the soluble organic phosphorus 

 was also changed into acid-soluble inorganic phosphorus. 



The result.s of this metabolism experiment, together with those of the main 

 feeding experiment of 217 days' duration, indicated that the phosphorus require- 

 ment for the normal growth and fattening of lambs does not exceed 3 gm. per 

 day per 100 lbs. of live weight. There was no evidence of correlation between 

 the amounts of phosphorus retained in the body, on the one hand, and the 

 amounts of phosphorus ingested, the amounts of protein ingested, or the body 

 weights of lambs, on the other. Variations in the quantity of digestible protein 

 consumed from 1.56 to 3.19 lbs. per 1,000 lbs. of live weight per day did not in- 

 fluence significantly the forms of phosphorus in the feces, the total phosphorus 

 in the urine, or the total phosphorus stored in the animal body, expressed in 

 percentage of the total phosphorus ingested. 



Tensile strength and elasticity of wool, R. F. Miller and W. D. Tallman 

 {U. S. DepL A(jr., Jour, Ayr. Research, 4 {1915), No. 5, pp. 379^90, pi. 1, 

 figs. 4). — The apparatus and methods used in determining the tensile strength 

 and elasticity of wool at the Montana Experiment Station are described. 



Feeding the sow and the suckling pigs, D. T. Gray {North Carolina Sta. 

 Circ. 25 {1915), pp. 5). — A general discussion of methods of feeding and care of 

 the sow and the suckling pigs under southern conditions, including data show- 

 ing the cost of feed in raising four litters of pigs to the weaning age to have 

 ranged from .$11.12 to .$13.78. 



Soy bean pastures for hogs, D. T, Gray {North Carolina Sta. Circ. 24 

 (1915), pp. 6). — This is a general discussion, base<l mainly on work previously 

 reported (P:. S. K., 20, p. 1031; 25, p. 374). 



Feeding skim milk, buttermilk, and whey to hogs, D. T. Gray {North 

 Carolina Sta. Circ. 29 {1915), pp. 5). — This is a general discussion, based 

 mainly on results of experiments conducted at several of the experiment stations 

 and previously reported. 



Report from the poultry division, F. C. Elfobd et al. ( Canada Expt. Farms 

 Rpts. 1914, pp. 955-991, pis. 7). — The maximum and minimum, also the range 

 and average, temperatures in poultry houses having various proportions of 

 cotton and glass are given. Results of experiments indicate that for an 8 by 4 

 ft. colony house in the Canadian climate a suitable proportion of wood, glass, 

 and cotton would be, estimating from the floor up, 15 in. of wood, 2 ft. of glass, 

 and 3.5 ft. of cotton. 



In an experiment to determine the number of eggs that would be fertilized 

 with one mating only, five fertilized eggs appeared to be the maximum. In a 

 fertility test following 12 hours' mating it was apparent that this method was 

 more conducive to results than the one mating only proved to be. In trials to 

 determine the increase of pen fertility after the introduction of the male, maxi- 

 mum fertility, 100 i)er cent, was reached in a pullet pen six days after mating, 

 and occurred three times in a period of 21 days. The same fertility was reached 

 in a pen of old hens on the eleventh day after introducing the male, but the 

 fertility increased more rapidly and continued a great deal stronger in the 

 pullet pen than in the pen of old hens. One male was also kept with 44 White 

 Leghorn hens. Though the iiercentage of fertility was highest when only 56.8 

 per cent of the hens were laying, the total hatch was only 33.8 per cent. When 



