1917 J ANIMAL PRODUCTION". 65 



respiratory conditions in man less open to objection than in similar experi- 

 ments with other infections. 



"The weight of experimental evidence, including . . . [that of the authors], 

 does not justify the elimination of exposure to cold as a possible though second- 

 ary factor in the incidence of acute respiratory disease. 



" From the limited data of . . . [the] last two experiments it is suggested 

 that any marked change of temperature predisposes rabbits to this infection, 

 the severity of which varies with the amount of change, and that a change 

 from low to high tempei'ature has an even more marked effect than that from 

 high to low." 



ANIMAL PRODUCTION. 



The relative value of field roots, F. T. Shutt (Canada Expt. Farms Rpts. 

 1915, pp. 150-155). — Analyses are given of 24 varieties of mangels, 30 varieties 

 of turnips, and 8 varieties of carrots. 



It appears that while the character of the season has much to do with the 

 relative richness of mangels, heredity also plays an important part in this direc- 

 tion. There were many instances in which the turnips closely approached or 

 equaled mangels in dry matter content, but they were decidedly inferior to 

 mangels as regards sugar. Carrots were not markedly different from turnips 

 in theii- percentage of dry matter, but were much richer in sugar. 



Fodders and feeding stuffs, F. T. Shutt (Canada Expt. Farms Rpts. 1915, 

 pp. 127-lJf9). — Analyses are given of the following feeding stuffs: Oats, barley, 

 bran, shorts, ground corn, gluten feed, oil-cake meal, flax meal, soy-bean cake, 

 cotton-seed meal, peanat-oil meal, rice meal, rice polishings, tankage, fish scrap, 

 alfalfa meal, molasses, feed flour, Kafir corn, screenings, potato cake, corn and 

 clover silage, frozen shredded corn, oat fodder and oat silage, prairie hay, 

 timothy hay, and oat straw, and various mixed and pi'oprietary feeds. 



Beef cattle, E. S. Aechibaxd et al. (Canada Expt. Farms Rpts. 1915, pp. 

 361-392, pis. 4). — Results of experiments with three lots of 4 steers each, lot 1 

 being grades showing a little beef blood, lot 2 medium butcher cattle, and lot 

 3 dairy steers, show that the ordinary steer of the country can be fed at a 

 good profit if the feeding period is not more than five months. 



Four lots of 6 Shorthorn steers each, lots 1 and 3 being classed as good butch- 

 ers and lots 2 and 4 as good stockers, were fed, lots 1 and 2 receiving 50 per 

 cent more roots and meal than lots 3 and 4, while half of lots 1, 2, 3, and 4 

 received in addition to their regular ration 2 lbs. of molasses per steer per day. 

 The heavy-fed lots of stockers showed a greater increase in weight than the 

 light-fed lots, but this was not true of the butchers. The greatest profits, 

 therefore, were realized from the heavy-fed stockers and light-fed good butchers. 

 In every case except one where molasses was added to the meal ration there 

 was a decided increase in the total gain, but the increase was hardly sufficient 

 to compensate for the high cost of molasses. 



Three lots of 8 steers each, one rated as of the best type and kept loose, 

 one of medium type and kept loose, and one of medium type and kept tied, 

 made average daily gains for 121 days of 2.41, 1.83. and 1.64 lbs., respectively, 

 at a cost per pound of gain of 8.34, 10.98, and 12.23 cts. Two uniform lots 

 of 4 steers were fed for 121 days, one lot receiving an addition of 0.93 lb. 

 molasses daily during tlie last 59 days. This lot made an average daily gain 

 per head of 1.7 lbs. at a cost per pound of gain of 12.05 cts., as compared with 

 1.59 lbs. and 12.4 cts. for the check lot. 



Three lots of steers, lot 1 being choice; lot 2, fair; and lot 3, dairy-type of 

 steers, fed 135 days, made average daily gains per head of 1.69, 1.59, and 1.22 



