Effect of zilpaterol hydrochloride on feedlot performance, nutrient intake, and digestibility in hair-breed sheep.

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Macias-Cruz U, Alvarez-Valenzuela FD, Soto-Navarro SA, Aguila-Tepato E, Avendano-Reyes L

Effect of zilpaterol hydrochloride on feedlot performance, nutrient intake, and digestibility in hair-breed sheep.

J Anim Sci. 2013 Apr;91(4):1844-9. doi: 10.2527/jas.2011-4911. Epub 2013 Jan 23.

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23345549 [ View in PubMed
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Abstract

Twelve Dorper x Pelibuey wether lambs (26.8 +/- 1.6 kg initial BW, 5 mo of age) were used to evaluate effects of zilpaterol hydrochloride (ZH) on feedlot performance, and effects of ZH and ZH supplementation period (15 and 30 d) on nutrient intake and digestibility. Lambs were blocked by initial BW, and assigned randomly within BW blocks to 1 of 2 treatments: i) control (no ZH), and ii) supplemented with ZH (10 mg ZH/wether lamb daily). Measurements of intake and digestibility were performed on d 9 to 15 and 24 to 30. Feedlot performance data were analyzed as a randomized complete block design, and nutrient intake and digestibility data were analyzed as a randomized complete block design with a 2 x 2 factorial arrangement of treatments. Final BW, ADG, total BW gain, and G:F were greater (P 0.05). Intake of DM, OM, CP, and GE were less (P

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