Zilpaterol hydrochloride improves growth performance and carcass traits without affecting wholesale cut yields of hair sheep finished in feedlot

Autor: Rolando Rojo-Rubio, Leonel Avendaño-Reyes, Benito Albarrán, José F. Vázquez, Sergio A. Soto-Navarro, Juan E. Guerra, Ulises Macías-Cruz
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Journal of Applied Animal Research, Vol 46, Iss 1, Pp 375-379 (2018)
Druh dokumentu: article
ISSN: 0971-2119
0974-1844
09712119
DOI: 10.1080/09712119.2017.1307756
Popis: Fourteen Dorper × Pelibuey ram lambs (initial body weight [BW] = 37.4 ± 1.0 kg and age = 4.5 mo) were housed in individual pens during a 30-d feeding period, and then slaughtered to determine the effects of zilpaterol hydrochloride (ZH) supplementation on productive performance, carcass characteristics and wholesale cut yields. Lambs were assigned under a randomized complete block design (initial BW as blocking factor) to one of two dietary treatments: basal diet without (control) or with 10 mg daily of ZH/lamb. Lambs fed ZH had greater (P ≤ .04) final BW, average daily gain and dry matter intake, but similar (P = .24) feed efficiency compared with control lambs. Hot and cold carcass weight, dressing percentage, longissimus muscle area and leg perimeter were greater (P ≤ .05) for ZH-fed lambs than for control lambs. With exception of blood percentage which decreased (P
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