Live Stock Breeders' Association. 139 



to the older cattle, inasmuch as they would be made fatter. This 

 is precisely what has been done in the attempts to compare the 

 economy of feeding cattle of different ages, notably in the Ottawa, 

 Canada, and the Kansas experiments. In our own tests we have 

 attempted to rectify this erroi, by making the cattle equally fat. 

 This has necessitated in each case the feeding of the young animals 

 a much longer time than the older ones, and the results of our tests, 

 therefore, would seem to form a more accurate and reliable com- 

 parison than those made elsewhere, where the condition was wholly 

 overlooked. 



RESULTS OF EXPERIMENTS IN COMPARING CATTLE OF DIFFERENT AGES. 



The most important work done along this line has been at the 

 Ottawa Experiment Station, Canada, at the Kansas Experiment 

 Station and by the Missouri Experiment Station, in co-operation 

 with the Bureau of Plant Industry, United States Department of 

 Agriculture, Washington, D. C, in charge of Professor F. B. Mum- 

 ford, Professor of Animal Husbandry in the University. 



It will be exceedingly valuable to bring the results of all these 

 experiments together, computed in the same way and on the same 

 basis, so that the results of one experiment may be fairly com- 

 pared with those of another. I have, therefore, recalculated both 

 the Canadian and the Kansas results and retabulated them so that 

 they may be comparable with our results. There is no way to in- 

 stitute a reliable comparison of the cost of gain made at the dif- 

 ferent experiment stations, because different kinds of rations were 

 used and the price put upon these feeds is not the same in all cases. 

 I have, therefore, taken the price of the feeds used by each station 

 as estimated by that station. It will be noted, furthermore, that 

 the tests in Canada and Kansas were made in the winter, while the 

 Missouri results were obtained by full feeding on bluegrass in 

 summer. 



