Influence of zeranol in Nelore steers on guinea grass pastures

Authors

  • Celso Barbosa Instituto de Zootecnia, Estação Experimental de Zootecnia de Andradina, SP
  • José Ramos Nogueira Instituto de Zootecnia, Estação Experimental de Zootecnia de Andradina, SP
  • Benedicto do Espírito Santo de Campos Instituto de Zootecnia, Divisão Técnica Básica e Auxiliar, Seção de Estatística e Técnica Experimental, Nova Odessa, SP
  • Ricardo Leandro Cazes Tortuga Companhia Zootécnica Agrária

Abstract

The effect of zeranol was studied on 58 Nelore steers, during growing and finishing phase, at Posto Experimental de Castilho, State of São Paulo, Brazil. It was utilized calves on a randomized block design that during the suckling phase received 0, 1, 2, 3 and 3 implants of 36 mg of zeranol each at average intervals of 84 days (treatments A, B, C, D and E), but those animals from E treatment received six more implants. There were no significant differences (P < 0.05) for weight gain of 123.3, 130.7, 132.1, 140.6 and 130.5 kg, respectively, for A, B, C, D and E treatments that resulted in body weight at 25 months of age of 284.5, 293.8, 303.8, 316.2 and 300.3 kg beign significant (P < 0.05) the difference of D treatment over the control. In finishing phase half of the replications received two more implants (treatments A1, B1, C1, D1 and E1) and the weight gains were 95.0, 110.0, 102.2, 91.4 and 110.6 kg for A, B, C, D and E, and 133.6, 125.8, 120.2, 127.8 and 107.8 kg for A1, B1, C1, D1 and E treatments, respectively, concluding that A1, B1 and D1 were superior than D treatment, while A1 was superior than A (P < 0.05). Total weight gains weaning to sloughter were 224.6, 236.6, 238.6, 228.8 and 250.0 kg, and 260.6, 234.2, 250.8, 268.6 and 253.0 kg, for the same sequence of treatments beign that D1 treatment was superior than A and D treatments (P < 0.05) get, in this order of treatments, the body weight at finishing 384.8, 406.8, 412.0, 401.4 and 418.6 kg, and 422.2, 424.0, 420.0, 451.4 and 418.2 kg, with no significant differences among them (P < 0.05).

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Published

2014-01-29

Issue

Section

FORAGE CROPS AND PASTURES

How to Cite

Influence of zeranol in Nelore steers on guinea grass pastures. (2014). Bulletin of Animal Husbandry, 44(1), 1-25. http://bia.iz.sp.gov.br/index.php/bia/article/view/733

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