Resumen

PARTIDA DE LA PENA, José Armando; CASAYA RODRIGUEZ, Tania Alejandra  y  RUBIO LOZANO, María Salud. Effect of zilpaterol hydrochloride on the carcass characteristics of Katahdin lamb terminal crosses. Veterinaria México OA [online]. 2015, vol.2, n.2, pp.01-13. ISSN 2448-6760.

Zilpaterol hydrochloride (ZH) supplementation (0 vs. 0.15 mg/kg live weight) was evaluated based on the carcass characteristics of Katahdin x Charollais (32 KCh) and Katahdin x Dorper (28 KD) crosses. Lambs were fed a mixed ration with 14% crude protein (CP) and 2.9 Mcal EM/kg DM. Data were analyzed using a completely randomized 2 x 2 factorial design: 2 genotypes (KCh and KD) and 2 ZH levels (0 and 0.15 mg/kg live weight). No interaction was found between ZH and the genotypes. Zilpaterol hydrochloride increased dressing percentage from 52.1 ± 0.3 to 53.7 ± 0.4% (P < 0.001). Animals that received ZH supplementation increased (P < 0.001) the area of their Longissimus dorsi (Ld) by 18.5% and had 7.5% more muscle, 6.0% less bone and 22.4% less fat compared with control lambs (P < 0.05). The breed of the sire had no effect on any of the variables studied. Final pH, fat thickness, conformation and linear carcass measurements did not change with ZH supplementation.

Palabras llave : Lamb; Zilpaterol; Carcass quality; Crossbreeding; Katahdin; Charollais; Dorper.

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