Abstract
A total of 1,017 southeastern crossbred heifer calves (average weight 572 lb; 260 kg) were used to determine the effect of administering Pyramid® 5 and Presponse® SQ (Fort Dodge Animal Health, Overland Park, KS) as two separate injections (SEP), or as a combination product (COMB), on health and performance in a commercial feedlot setting. There were no significant differences (P>0.05) between the two vaccine treatments for morbidity, mortality, or realizers. The SEP group had significantly greater weight gain (P=0.05) and average daily gain (P<0.01) at reprocessing (day 119). These differences subsided by harvest. Hot carcass weights, estimated live-weights and average daily gains at the end of the feeding period were similar among the vaccination groups (P>0.05).
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