Effect of virginiamycin and zinc bacitracin on the performance of growing finishing swine

Pacheco, C.R.V.M.; Ferreira, A.S.; Costa, V.

Revista da Sociedade Brasileira de Zootecnia 17(2): 172-179

1988


Accession: 007264562

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Abstract
Eighty Landrace pigs (48 females and 32 castrated males) were used in a 2 .times. 4 factorial arrangement (sex and rations) to evaluate the effect of antibiotics on their performance. The experimental unit was represented by two pigs confined in the same pen with slotted concrete floors. The rations were following: R1 .sbd. control, a corn .sbd. soybean meal ration, supplemented with minerals and vitamins, R2 .sbd. control plus 10 ppm of virginiamycin, R3 .sbd. control plus 50 ppm of zinc bacitracin, and R4 .sbd. control plus 10 ppm of virginiamycin and 50 ppm of zinc bacitracin. The growing ration (16% of crude protein) and the finishing ration (14% of crude protein) were feed ad libitum from 25.8 kg to 60.6 kg and from 60.6 kg to 99.4 kg of live weight, respectively. The weight daily gains and feed/gain rations were not statistically (P > 0.05) different among the rations (R1 .sbd. 706 .+-. 34 g, 3.27 .+-. 0.06; R2 .sbd. 732 .+-. 16 g, 3.19 .+-. 0.04; R3 .sbd. 736 .+-. 20 g, 3.25 .+-. 0.05 and R4 .sbd. 762 .+-. 20 g; 3.25 .+-. 0.03, respectively). The interaction between sex and rations was not statistically significant (P > 0.05). The results suggest to be occured a benefic effect on efficiency of virginamycin and zinc bacitracin to increase weight daily gain, but not to decrease feed conversion.