Artículos de revistas
Effects of zilpaterol hydrochloride and zinc methionine on growth performance and carcass characteristics of beef bulls
Author
RODRIGUEZ GAXIOLA, MIGUEL ANGEL; 319744
Domínguez Vara, Ignacio Arturo; 121047
BARAJAS CRUZ, RUBEN; 8413
Mariezcurrena Berasain, Maria Antonia; 111307
BORQUEZ GASTELUM, JOSE LUIS; 90207
CERVANTES PACHECO, BILLY JOSUE;x1232893
RODRIGUEZ GAXIOLA, MIGUEL ANGEL
Domínguez Vara, Ignacio Arturo
BARAJAS CRUZ, RUBEN
Mariezcurrena Berasain, Maria Antonia
BORQUEZ GASTELUM, JOSE LUIS
CERVANTES PACHECO, BILLY JOSUE
Institutions
Abstract
Sixty beef bulls with a body weight (BW) of 314.79 16.2 kg were used to evaluate the effects of zilpaterol hydrochloride (ZH) and zinc methionine (ZM) on growth performance and carcass characteristics. The experimental design was a randomized complete block, with a factorial 22 arrangement of treatments (ZH: 0 and 0.15 mg kg 1 BW; ZM: 0 and 80 mg kg 1 dry matter). The ZH increased (PB0.05) the final BW, average daily gain, feed conversion, carcass yield and longissimus dorsi area. Bulls fed ZH plus ZM had less (PB0.01) backfat thickness and intramuscular fat (IMF) compared with those fed ZH or ZM alone. The ZH increased (PB0.02) the meat crude protein content and cooking loss. It is therefore concluded that ZH increases growth performance, carcass yield, longissimus dorsi area, and meat crude protein. The interaction of ZM and ZH did not present additional advantages. The reason for the reduction in backfat thickness and IMF by ZH plus ZM is unclear, and implies that our knowledge of b-agonistic adrenergic substances and their interactions with minerals is incomplete.