Lenght of ractopamine supplementation in diets for finishing barrows

Ciência Rural

Marçal, Danilo Alves²  Rodrigues, Gabriela Puhl²  Kiefer, Charles²  Abreu, Rodrigo Caetano de²  Garcia, Elis Regina de Moraes¹  Oliveira, Bruna Ferreira de²  Santos, Tânia Mara Baptista dos¹ 

[1] Universidade Estadual de Mato Grosso do Sul (UEMS), Aquidauana, Brasil;Universidade Federal de Mato Grosso do Sul (UFMS), Campo Grande, Brasil

关键词: additive;    ß;    adrenergic;    carcass characteristics;    cost of supplementation.;   

DOI  :  10.1590/S0103-84782013000200027

学科分类：农业科学（综合）

来源: Universidade Federal de Santa Maria * Centro de Ciencias Rurais

【 摘 要 】

The study was conductedto determine the optimal period of supplementation of 20ppm of ractopamine indiets of finishing barrows. Fifty pigs, with initial weight of 65.85±4.34kgwere used. The pigs were distributed in randomized blocks design of six treatments(supplementation of ractopamine for 0, 7, 14, 21, 28 and 35 days pre-slaughter),with four replications for treatments 0, 7, 14, 21 and 28 days and five replicatesfor the treatment supplemented by 35 days. Each experimental unit consistedof two animals. The feed conversion improved (P<0.05) and the hot carcassweight, the amount of lean meat and the index of carcasses increased linearly(P<0.05) with increasing period of ractopamine supplementation. The economicreturn for the amount of lean meat produced per animal improved linearly untilthe period of seven days of supplementation with ractopamine, from which remainedat a plateau (P<0.05). Supplementation of 20ppm of ractopamine in the dietof finishing barrows during the 35 days improved feed conversion, increasesthe hot carcass weight, the amount of lean meat and the index of carcasses.The supplementation of 20ppm ractopamine in the diet of finishing barrows resultsin economic return for the amount of lean meat produced per animal regardlessof the length of supplementation.

【 授权许可】

CC BY-NC