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- Title
Impact of dietary energy level and ractopamine (Paylean) on growth performance, carcass characteristics, and meat quality of finishing pigs.
- Authors
Hinson, R. B.; Wiegand, B. R.; Ritter, M. J.; Allee, G. L.; Carr, S. N.
- Abstract
A total of 54 finishing barrows (initial BW = 99.8 ± 5.1 kg; PIC C22 × 337) reared in individual pens were allotted to one of 6 dietary treatments in a 2 × 3 factorial arrangement of treatments with 2 levels of ractopamine (0 and 7.4 ppm) and 3 levels of dietary energy (high, 3,537; medium, 3,369; and low, 3,317 kcal ME/kg) to determine the effects of dietary ractopamine and various energy levels on growth performance, carcass characteristics, and meat quality of finishing pigs. High-energy diets were corn-soybean meal based with 4% added fat, medium- energy diets were corn-soybean meal based with 0.5% added fat, and low-energy diets were corn-soybean meal based with 0.5% added fat and 15% wheat middlings. Diets within each ractopamine level were formulated to contain the same standardized ileal digestible Lys:ME (0 ppm, 1.82; and 7.4 ppm, 2.65 g/Mcal ME). Individual pig weights and feed disappearance were recorded at the beginning and conclusion (d 21) of the study. On d 21, pigs were harvested for determination of carcass characteristics and meat quality. No ractopamine × energy level interactions were observed for any response criteria. Final BW (125.2 vs. 121.1 kg), ADG (1.2 vs. 1.0 kg/d), and G:F (0.31 vs. 0.40) were improved (P < 0.001) with feeding of ractopamine diets. Feeding of the low-energy diet reduced (P = 0.001) final BW and ADG compared to the high- and medium-energy diets. Gain:feed was reduced (P = 0.005) when the medium-energy diets were fed compared to the high-energy diets. Additionally, G:F was reduced (P = 0.002) when the low-energy diets were compared to the high- and medium-energy diets. Feeding ractopamine diets increased (P < 0.05) HCW (93.6 vs. 89.9 kg) and LM area (51.2 vs. 44.2 cm2). The LM pH decline was reduced (P = 0.05) by feeding ractopamine diets. The feeding of low-energy diets reduced (P = 0.001) HCW when compared with the high- and medium-energy diets and reduced (P = 0.024) 10th rib backfat when compared with the high- and medium-energy diet. These data indicate that feeding ractopamine diets improved growth performance and carcass characteristics, while having little or no detrimental effects on meat quality. Reductions in energy content of the diet by adding 15% wheat middlings resulted in impaired ADG, G:F, and 10th rib backfat. There were no ractopamine × energy level interactions in this trial, which indicates that the improvements resulting from feeding ractopamine were present , regardless of the dietary energy levels.
- Subjects
ENERGY metabolism; CALORIC content of foods; SWINE nutrition; MEAT quality; LIVESTOCK carcasses; SOYBEAN meal as feed; QUALITY
- Publication
Journal of Animal Science, 2011, Vol 89, Issue 11, p3572
- ISSN
0021-8812
- Publication type
Article
- DOI
10.2527/jas.2010-3302