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Effect of ractopamine and conjugated linoleic acid on performance of late finishing pigs

Published online by Cambridge University Press:  30 July 2019

J. C. Panisson ,
A. Maiorka ,
S.G. Oliveira ,
A. Saraiva ,
M. S. Duarte ,
K. F. Silva ,
E. V. Santos ,
R. L. S. Tolentino ,
I. M. G. Lopes  and
L. L. M. Guedes
...Show all authors
J. C. Panisson
Affiliation:
Animal Science Department, Universidade Federal do Paraná (UFPR), R. dos Funcionários 1540, Juvevê Curitiba, 80035-050 PR, Brazil
A. Maiorka
Affiliation:
Animal Science Department, Universidade Federal do Paraná (UFPR), R. dos Funcionários 1540, Juvevê Curitiba, 80035-050 PR, Brazil
S.G. Oliveira
Affiliation:
Animal Science Department, Universidade Federal do Paraná (UFPR), R. dos Funcionários 1540, Juvevê Curitiba, 80035-050 PR, Brazil
A. Saraiva
Affiliation:
Animal Science Department, Universidade Federal de Viçosa (UFV), Av. P H Rolfs sn, Viçosa, 36570-900 MG, Brazil
M. S. Duarte
Affiliation:
Animal Science Department, Universidade Federal de Viçosa (UFV), Av. P H Rolfs sn, Viçosa, 36570-900 MG, Brazil
K. F. Silva
Affiliation:
Animal Science Department, Universidade Federal do Paraná (UFPR), R. dos Funcionários 1540, Juvevê Curitiba, 80035-050 PR, Brazil
E. V. Santos
Affiliation:
Institute of Agricultural Sciences/ICA, Universidade Federal de Minas Gerais (UFMG), Av. Universitária 1.000, Montes Claros, 39404-547 MG, Brazil
R. L. S. Tolentino
Affiliation:
Institute of Agricultural Sciences/ICA, Universidade Federal de Minas Gerais (UFMG), Av. Universitária 1.000, Montes Claros, 39404-547 MG, Brazil
I. M. G. Lopes
Affiliation:
Institute of Agricultural Sciences/ICA, Universidade Federal de Minas Gerais (UFMG), Av. Universitária 1.000, Montes Claros, 39404-547 MG, Brazil
L. L. M. Guedes
Affiliation:
Institute of Agricultural Sciences/ICA, Universidade Federal de Minas Gerais (UFMG), Av. Universitária 1.000, Montes Claros, 39404-547 MG, Brazil
B. A. N. Silva*
Affiliation:
Institute of Agricultural Sciences/ICA, Universidade Federal de Minas Gerais (UFMG), Av. Universitária 1.000, Montes Claros, 39404-547 MG, Brazil
*
†E-mail: brunosilva@ufmg.br
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Abstract

The dietary inclusion of feed additives to improve the carcass characteristics of the final product is of great importance for the pork production chain. The aim of our study was to evaluate the effects of the association of ractopamine (RAC) and conjugated linoleic acid (CLA) on the performance traits of finishing pigs during the last 26 days prior to slaughter. In total, 810 commercial hybrid barrows were used. Animals were distributed among treatments according to a randomised block design in a 3 × 3 factorial arrangement, with three RAC levels (0, 5 or 10 ppm) and three CLA levels (0, 0.3 or 0.6%). Pigs fed the diet with 5 ppm RAC had higher average daily feed intake (ADFI) (2.83 kg; P < 0.05) when compared with those fed 10 ppm RAC and the control diet (2.75 and 2.74 kg, respectively). Lower ADFI values (P < 0.01) were observed with the diets containing CLA compared with the control diet with no CLA (2.73 and 2.75 v. 2.85 kg/day, respectively). The average daily weight gain of pigs fed 5 and 10 ppm RAC was +148 and +173 g/dayhigher (P < 0.001), respectively, than those fed the control diet. Dietary RAC levels influenced (P < 0.001) feed conversion ratio (FCR), which was reduced as RAC levels increased, with the pigs fed 10, 5 and 0 ppm RAC presenting FCR values of 2.57, 2.71 and 3.05, respectively. FCR also improved (P < 0.05) with the inclusion of 0.6% CLA relative to the control diet (2.70 v. 2.84, respectively). There was a significant interaction between CLA × RAC levels (P < 0.01) for final BW, loin eye area (LEA) (P < 0.05) and backfat thickness (BT) (P < 0.05). The treatments containing 10 ppm RAC + 0.6% or 0.3% CLA increased LEA and reduced BT. In conclusion, the level of 10 ppm inclusion of RAC increased the overall performance parameters of pigs and therefore improved production efficiency. The combined use of RAC and CLA promoted a lower feed conversion ratio as well as better quantitative carcass traits, as demonstrated by the higher LEA and lower BT. The dietary inclusion of CLA at 0.3% improved feed efficiency, however, without affecting LEA or BT yields.

Keywords

carcass traitsβ-adrenergicfeed conversion ratiolean meat depositionbackfat thickness
Type
Research Article
Information
animal , Volume 14 , Issue 2 , February 2020 , pp. 277 - 284
Copyright
© The Animal Consortium 2019 

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