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Pigs fed containing ractopamine and citrus extracts: performance and carcass characteristics

Carlos Augusto Rigon Rossi Paulo Alberto Lovatto Gerson Guarez Garcia Cheila Roberta Lenhen Glauber Valentim Porolnik Marcos Speroni Ceron Gustavo Dias Lovato About the authors

This study was carried out to evaluate the effect of the addition of the citrus extracts and ractopamine in finishing pig diets. A Hundred eight pigs were used (54 males and 54 females) in a completely randomized design, blocked by sex and distributed in nine treatments: T1. control (C) (0ppm of the ractopamine e 0ppm of the citrus extracts), T2. C+10RAC (ractopamine, ppm), T3. C+20RAC, T4. C+250EC (citrus extracts, ppm), T5. C+500EC, T6. C+250EC+10RAC, T7. C+250EC+20RAC, T8. C+500EC+10RAC and T9. C+500EC+20RAC. The final body weight (109.9±3.60kg), feed intake (2.6±0.24kg d-1), body weight gain (1.01±0.09kg d-1), feed conversion ratio (2.7±0.25), carcass length (97±2.71cm), depth muscle (56.1±5.63mm), and pH (5.9±0.33) were not affected by treatments. There was a significant effect for the treatment with 20ppm of ractopamine, which was 5.7 higher, in relation to the treatment with 10ppm of ractopamine. The backfat thickness of control group was 35% higher than the ractopamine levels and the interaction was of 10ppm of ractopamine and 500ppm of citrus extracts. The lean meat in the control group was on average, 5.3% lower in relation to the ractopamine levels. Feeding of finishing pigs with diets containing ractopamine, citrus extracts and their interactions didn't affect performance, however affected some carcass characteristics.

ascorbic acid; bioflavonoids; ß-adrenergic agonist; nutrition

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