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Implant Strategies For Yearling Steers, R. H. Pritchard, M. A. Robbins
Implant Strategies For Yearling Steers, R. H. Pritchard, M. A. Robbins
South Dakota Beef Report, 1991
Various implant strategies were compared in heavy yearling steers fed for 98 days. Implant treatments included control (nonimplanted), 722 (72 mg zeranol), 36TBA (36 mg zeranol plus 140 mg trenbolone acetate [TBA]), 72TBA (72 mg zeranol plus TBA) and ETBA (20 mg estradiol-200 mg progesterone plus TBA). The 72-mg zeranol dosage represents two implants in one site. Combinations of implants were administered, one in each ear. Implanting increased (P<.05) ADG and DM1 and decreased (P<.05) feed/gain values. Among implanted steers, no differences (P>.10) in ADG or DM1 were observed. Feed/gain was lower (P< .05) for zeranol-TBA combinations than the 72-mg zeranol treatment. Carcasses were heavier and rib eye area was greater (P<.05) in the 72TBA than 36TBA treatment. Kidney-pelvic-heart fat was lower (P<.05) when the ETBA combination was used.
Effects Of Energy Restriction And Realimentation On The Development Of Carcass Traits Of Yearling Heifers, C. L. Anderson, R. H. Pritchard, D. L. Boggs
Effects Of Energy Restriction And Realimentation On The Development Of Carcass Traits Of Yearling Heifers, C. L. Anderson, R. H. Pritchard, D. L. Boggs
South Dakota Beef Report, 1991
Feedlot performance and carcass development were compared between heifers fed a low energy diet for an 88-day backgrounding period before receiving a high energy diet (LE) and heifers receiving a high energy diet throughout the trial (HE). The LE heifers were delayed in carcass and muscle growth (P<.10) when compared to HE heifers on day 89. At an 1100 1b weight constant, LE and HE carcasses had similar dissected muscle weights, rib fat measurements and marbling scores. Carcass dressing percentage was only affected by time (P<.10) on an energy dense diet at 1030 Ib. During the initial 88-day background period, HE heifers had higher ADG (P<.001) and lower Feed/gain requirements (P<.001). During realimentation, compensatory growth was exhibited through increased ADG (P< .lo) and improved feed/gain (P<.05) for LE heifers. From day 0 until slaughter, the cumulative ADG for HE heifers was greater (P<.05) and the cumulative feed conversion was lower for HE heifers (P<.10).