Growth and carcass merit of purebred Jersey steer calves finished on grain-based diets at two different energy levels Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2f75rb23j

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  • Purebred Jersey steers are often overlooked for beef production due to the perceived poor growth and production. Currently dairy persons marketing their steer offspring are receiving minimal compensation due to lack of demand by beef feeders and a saturated veal market. Twenty purebred Jersey steers were used to evaluate lifetime growth and carcass development while finished on different caloric-density diets. Daily rations were distributed by pen during the growing phase and individually during the finishing phase. Finishing diets were formulated for either 70% concentrate (F70) or 85% concentrate (F85) to determine the influence of caloric density on body composition. Growth, intake, and carcass data were analyzed as a randomized complete block design with initial BW groupings (LIGHT and HEAVY) as the blocking factor. Data from the growing phase (169 d) were analyzed as LIGHT versus HEAVY, whereas data from the finishing phase were analyzed as LIGHT versus HEAVY and F70 verses F85. The HEAVY steers were 8% heavier (P <0.05) at harvest than LIGHT steers and tended (P<0.10) to consume more DMI although they were not different (P>0.10) in G:F. The F85 steers had greater (P<0.05) ADG (0.91 versus 0.82 kg/d) and greater (P<0.05) G:F (0.12 versus 0.11 kg/kg) which allowed them to be 5.6% heavier at harvest versus F70 steers. The HEAVY steers had 12.5% heavier (P<0.05) HCW with a 13% advantage (P<0.05) in REA over LIGHT steers. Steers consuming the F85 finishing diet had 6% greater (P<0.05) HCW and 12% advantage in REA over F70 steers. Although all steers reached choice grade, F85 steers tended (P<0.10) to have greater marbling over F70 steers (640 versus 590, respectively). At harvest, 9-10-11 rib sections were removed from the left side of each carcass to undergo meat quality testing. Meat samples from the F85 steers tended (P<0.10) to be more flavorful and juicy versus the F70 steers. Meat samples from the HEAVY steers tended (P<0.10) to be more flavorful, but had greater (P<0.05) off-flavor scores versus the LIGHT meat samples. Subcutaneous fat samples from the F70 steers had greater (P<0.05) concentrations of c-9, t-11 CLA than the F85 steers. Steric acid was found in the greatest concentrations in KPH and omental fats (21.3 to 23.4% total fatty acid), while being least concentrated in the subcutaneous fat (7.9 to 9.2% total fatty acid). Jersey steers have the ability to produce highly marbled carcasses with potential health benefits and acceptable meat attributes; however, the carcass quality must be valued against low growth efficiency.
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