Effects of Synovex-S and recombinant bovine growth hormone (Somavubove) on growth responses of steers. I. Performance and composition of gain.
1996
Rumsey T.S. | Elsasser T.H. | Kahl S. | Moseley W.M. | Solomon M.B.
The influence of Synovex-S (SYN) ear implant (200 mg progesterone and 20 mg estradiol benzoate) and Somavubove (SbV) recombinant bovine growth hormone (.1 mg/kg BW i.m., daily) on live animal performance, tissue growth, and the partitioning of energy gain was determined using a slaughter-balance protocol with 25 young MARC II x (Angus-Hereford crossbred) beef steers (initial BW 182+/- 1.8 kg). Following 21 d of adjustment to individual pens and to a diet of 80% concentrate and 20% corn-grass (1:1) silages, five groups of five steers per group were assigned to initial slaughter or a 2 x 2 factorial arrangement of treatments of CTL (no implant + daily placebo i.m. injection of bicarbonate-saline), SYN (implant + placebo), SbV, or SYN + SbV and slaughtered at 56 d on treatment. Steers were fed (per kilogram BW 0.75 daily) 20 g of CP and 252 Kcal of ME and consumed 5.5 +/- 0.07 kg/d DM across treatments. Empty body and carcass gains were affected (SYN, P < 0.01; SbV, P < 0.01) by treatments (CTL, SYN, SbV, and SYN + SbV: 1.26, 1.43, 1.63, 1.78 kg/d SEM = 0.05, and 0.78, 0.97, 0.97, 1.08 kg/d, SEM = 0.04 respectively). Noncarcass gain was 0.45, 0.48, 0.60, and 0.60 kg/d (SEM = 0.03; SbV, P < 0.01). For empty body, both protein and water gains were greater for SYN-implanted steers (P < 0.05) than for steers not implanted and for SbV-injected steers (P < 0.01) than for placebo-injected steers. Treatments did not influence the efficiency of energy gain. The proportional amount of energy deposited as protein was greater ( P < 0.01) for SbV-injected steers than for placebo-injected steers. The proportional amount of protein deposited was not influenced by SYN ( P > 0.10); however, means were numerically greater for SYN-implanted steers than for steers not implanted, the largest mean being for the SYN + SbV treatment group. Somavubove increased ( P < 0.01) the efficiency of energy deposited as protein in both the empty body and carcass compared with steers not receiving SbV.
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