Progress report . otal of 22 animals—heifers, bulls and steers—from a liveweight of 500 to 900 pounds. The animals tested were the entire 1951 progenyof two Shorthorn bulls and were maintained under uniform feeding and manage-ment. The data for the individual animals are shown in Table G. TABLE 6.—PERFORMANCE OF MOST AND LEAST EFFICIENT ANIMALS—500 TO 900 LB. LIVE WEIGHT—1951 Number of dayson test Averagedailygain Feed consumed per100 lb. gain Meal Hay 19832618723623525925] lb. 2-021 21 2-26 1-69177 1- 17 lb. 499830450610 00472464] 432 280 334 303 370 351 13 82919—3 14 A maximum
Progress report . otal of 22 animals—heifers, bulls and steers—from a liveweight of 500 to 900 pounds. The animals tested were the entire 1951 progenyof two Shorthorn bulls and were maintained under uniform feeding and manage-ment. The data for the individual animals are shown in Table G. TABLE 6.—PERFORMANCE OF MOST AND LEAST EFFICIENT ANIMALS—500 TO 900 LB. LIVE WEIGHT—1951 Number of dayson test Averagedailygain Feed consumed per100 lb. gain Meal Hay 19832618723623525925] lb. 2-021 21 2-26 1-69177 1- 17 lb. 499830450610 00472464] 432 280 334 303 370 351 13 82919—3 14 A maximum difference of 40 per cent in rate and efficiency of gain occurredbetween the females. Smaller but substantial differences occurred between thebulls and also between the steers. The heifer that showed the best performanceand the heifer that made the smallest gains were sired by the same animal. Thebull that made the best record and the bull that made the poorest record werealso sired bv the same FlGUHE L. Shorthorn hulls showed wide differences in rate and economy of gainfrom 500 to 900 pounds body weight. Upper: this animal gained 2-26 poundsdaily and required 450 pounds of meal and 2S0 pounds of hay per 100 pounds : This animal gained 1-79 pounds daily and required 587 pounds of meal and319 pounds of hay per 100 pounds gain. 11 would appear from the limited data recorded in this test that there is awide variation in the rate and economy of gain in beef cattle. Further beefprogeny trials will be undertaken to develop methods of testing and to investigatethe possibility of developing more efficienl animals through selection and breedingon the basis of performance tests. Sheep A flock of approximately 36 Shropshires was overwintered each year duringt he period covered by t iiis report. The experimental work wit h sheep was limitedto a, study of the possibility of developing a more productive type of Shropshirethrough selection and breeding for less
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