Ractopamine, chromium-methionine and their combinations as metabolism modifier feed additives of growing and finishing pigs

Revista Brasileira de Zootecnia

Costa, Leandro Batista¹  Berenchtein, Bernardo¹  Tse, Marcos Livio Panhoza¹  Almeida, Vivian Vezzoni de¹  Braz, Débora Barbosa¹  Miyada, Valdomiro Shigueru¹ 

[1] USP, Piracicaba

关键词: beta-adrenergic agonist;    carcass;    meat;    nutrition;    performance;   

DOI  :  10.1590/S1516-35982010000900015

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The purpose of this study was to evaluate the effect of ractopamine and chromium-methionine additions and their combinations in diets for growing and finishing swines on performance, carcass traits and meat quality. Sixty-four Topigs line swines at 26.56 ± 3.11 kg initial body weight were distributed in a randomized block experimental design in a 2 x 2 factorial scheme with two levels of ractopamine (0 and 5 ppm) and two levels of chromium-methionine (0 and 400 ppb), totaling four diets with eight replications (blocks) per diet. In each one of the three following phases, growing 1 (from 26.56 kg to 50.51 kg), growing 2 (from 50.51 kg to 70.32 kg) and finishing (from 70.32 kg to 114.80 kg), meal rations and water were given ad libitum to animals.When pigs reached 114.80 ± 4.98 kg body weight, they were slaughtered and carcasses were evaluated regarded to cold carcass yield, carcass length, backfat thickness, loin eye area and fat:meat ratio. Samples of longissimus dorsi muscle were taken to measure colour, final pH and drip loss. Supplementation of ractopamine improved feed conversion, cold carcass yield, loin eye area, fat:meat ratio and drip loss, and it reduced redness and yellowness components of meat. Although chromium-methionine decreased daily feed intake, it does not affect the performance and carcass traits neither meat quality of swines. Supplementation of ractopamine combined to chromium-methionine do not affect carcass traits and meat quality of animals.

【 授权许可】

CC BY-NC