TY  - JOUR
T1  - Influence of the  β-Agonist, Zilpaterol, on Growth Performance and Carcass Characteristics of Feedlot Steers
AU - , A. Plascencia AU - , N.G. Torrentera AU - , R.A. Zinn 
JO  - Journal of Animal and Veterinary Advances
VL  - 7
IS  - 10
SP  - 1257
EP  - 1260
PY  - 2008
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2008.1257.1260
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2008.1257.1260
KW  - β-agonist
KW  -beef cattle
KW  -carcass characteristics
KW  -performance
KW  -zilpaterol
AB  - One hundred forty crossbred steers (373±22 kg) were used in a randomized complete block design experiment (14 pens, 10 steers/pen) to evaluate the influence of supplementation of a steam-rolled wheat-based finishing diet with 6 mg kg <SUP>1</SUP> (as-fed basis) zilpaterol during the final 6 weeks of the finishing period on growth performance and carcass characteristics. Supplemental zilpaterol did not influence (p&gt;0.20) DM intake (8.55 vs. 8.45 kg day <SUP>1</SUP>), but enhanced (p&lt;0.01) ADG (33%, 1.45 vs. 1.93 kg day <SUP>1</SUP>) and feed efficiency (26%, 5.90 <I>vs.</I> 4.38). Based on observed NE intake, ADG of the non-supplemented steers was 99% of expected. In contrast, with zilpaterol supplemented steers ADG was 24% greater (p&lt;0.01) then expected. Zilpaterol supplementation increased carcass weight (4.0%, p&lt;0.01), dressing percentage (3.9%, p&lt;0.01) and fat thickness (26%, p&lt;0.05) and reduced KPH (14% p&gt;0.05), but did not influence (p&gt;0.20) LM area or marbling score. Adjusting to a constant carcass weight, zilpaterol supplementation increased gross (bone- and trim-in) primal cuts (1.7%, p&lt;0.01), boneless closely trimmed primal cuts (2.9%, p&lt;0.05) and boneless closely trimmed retail cuts (3.2%, p&lt;0.10).
ER  -