1920] DAIRY FARMING DAIRYING. 575 



In the 3.3-w'oek frrowiii.n- period the cockerels increased in weight from 1.13 to 

 6.73 lbs. per bird, while the capons increased from 1.1 to 7.42 lbs. The cajmns 

 did not beiiin their faster growth until October. During the fattening period 

 the cock«'rels gained only O.OG lb. per head while the capons put on an average 

 of 0.34 lb. The cockerels coiisuiiumI 10.9.") lbs. of feed per pound of grain and 

 the capons 9.5 lbs. 



The capons dres.sed out with a loss of 6 per cent in weight and the live cock- 

 erels shrank 2.G per cent during shipment to Baltimore. With feed at 3.5 cts., 

 capons at .')5 cts. and live cockerels at 34 cts. a pound, there was an average loss 

 of 45 cts. per head on the cockerels and an average profit of .$1.24 on the capons. 



The author deplores the erroneous statements to be found in some poultry 

 books that capons grow much larger than cockerels. 



IBroodiness: Its influence and control, II. R. Hannas {New Jersey Stas., 

 Bints to Poultrymeu, 8 {11)20), No. 10, pp. //).— The economic loss due to 

 broodiness is illustrated by data secured at the first Vincland egg-laying con- 

 test. Some control measures are suggested. 

 The effect of age of eggs on their hatching quality, R. H. Waite {Mary- 

 land Sta. Bill. 233 {1919), pp. 81-101, fhis. S).— Ob.servations are recorded of 

 pe hatching percentages of a total of 20,415 eggs grouped according to the 

 length of time (up to 28 days) between laying and the beginning of incubation. 

 It Is concluded that " the deterioration in hatching quality of eggs with age is 

 slight up to the sixth or seventh day, but after this period the rate of deteriora- 

 tion is very much accelerated and varies almost directly with the age." Eggs 

 set on the day laid hatched at least as well as those held for a few days. No 

 ilifCerences were observed between Leghorn and White Plymouth Rock eggs. 



Data are also presented showing that the practice of turning eggs prior to 

 incubation is unnecessary if not harmful. 



A list of breeders of standard bred jjoultry in Montana {Montana Sta. 

 Spec. Circs., 6 {1918), pp. 19; 7 {1920), pp. i6').— These lists are classified by 

 breeds. 



Standard of perfection for rabbits, cavies, mice, rats, skin and fur 

 bearing animals {Cleveland: Henry M. Adolph, 1920, pp. 52, figs. 2). — This is 

 a formulation of exhibition .standards for varieties of rabbits and guinea pigs 

 recognized by the National Breeders and Fanciers Association of America, 

 together with briefer notes on mice, rats, and skunks. 



DAIRY FARMING— DAIRYING. 



Breeding experiments with dairy cattle, W. M. Regan {N. J. Dept. Agr. 

 Bill. 24 {1920), pp. S23-S26) .—The autlior outlines briefly the plans of two 

 breeding experiments being started by the New Jersey Experiment Stations, 

 one of which involves crosses between Jerseys and Holsteins and the other a 

 study of inbreeding in Holsteins. 



Calf rearing, J. L. Bruce {New Zeal. Jour. Agr., 20 {1920), No. 5, pp. 289- 

 298, figs. 10). — Two 17-week feeding experimeiits are reported, each involving 

 4 lots of 4 calves less than one week old at the start. Except in one lot the 

 ration during the first 2 weeks consisted of whole milk exclusively (8 lbs. per 

 head daily). Various amounts of skim milk and home-grown concentrates 

 were fe<l during the rest of the period, and the calves had access to pasture. 

 There were no deaths. 



In the first experiment, conducted at the Ruakura Farm of In.struction, Hamil- 

 ton, the initial weights varied from 301 to .303 lbs. per lot. In the case of 3 

 lots skim milk feeding (15 lbs. per head daily) continued throughout the final 



