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A two-year data of three-year study integrating pasture and drylot feeding systems was usedto examine effect of frame score on performance and carcass characteristics of steers. Eachyear, 84 fall-born and 28 spring-born calves of similar genotypes were used. Fall-born andspring-born calves were started on test in May and October, respectively. Treatments were: 1)fall-born calves directly into feedlot; 2 and 3) fall-born calves put on pasture with or withoutan ionophore and moved to the feedlot at the end of July; 4 and 5) fall-born calves put onpasture with or without an ionophore and moved to the feedlot at the end of October; 6and 7) spring-born calves put on pasture with or without an ionophore and moved to thefeedlot at the end of October. Frame scores were determined by taking steers’ age and liveweight into consideration. Cattle that grazed the same duration on pasture were regarded asthe same treatment regardless of whether they received an ionophore or not. In the feedlot,steers were provided an 82 % concentrate diet containing whole-shelled corn, ground alfalfahay, and a protein, vitamin and mineral supplement containing ionophore and molasses.Pens of cattle were harvested at approximately 522 kg. Cattle having a higher frame scoreat the entry to pasture and grazed until July and October tended to have higher and lowerdaily gain on pasture than those having lower frame score, respectively (P>0.05). Fall-bornand spring-born cattle grazed until October, which had higher frame scores at the entry topasture tended to have higher daily gain in the feedlot showing a compensatory growth. Inthe feedlot, within each treatment cattle having higher frame score tended to have higherdaily gain (P>0.05) and had higher dry matter intake (P<0.05). Cattle spending longer timein the feedlot have better carcass quality and higher yield grades. Results showed that cattlewith higher frame scores had higher growth potentials in the feedlot and if the grazingseason is extended then daily gain of cattle having higher frame score decreases

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Effect of frame score on performance and carcass characteristics of steers finished in the feedlot or backgrounded for various time on pasture and finished in the feedlot