RESUMO
Para evaluar el efecto de la incorporación de la harina de follaje de yuca (HFY) en niveles crecientes (0; 2,5; 5 y 7,5%) en raciones alimenticias para pollos de engorde sobre las características al sacrificio y el rendimiento en canal y en cortes, se usaron 32 pollos de engorde, hembras de la raza Cobb de 42 días de edad. El análisis de la varianza detectó efectos significativos (P<0,05) del nivel de HFY sobre rendimiento de la cabeza, obteniéndose los mayores valores (3,26 y 2,72%, respectivamente) con 5 y 7,5% de HFY. La inclusión de HFY produjo un aumento del 6% (P<0,05) en el rendimiento del muslo, con o sin cadera, pero no afectó significativamente el rendimiento de la canal fría ni ningún otro corte. La utilización de HFY en la alimentación de pollos de engorde a niveles de 7,5%, no ocasionó detrimento en algunos de los parámetros productivos, ni produjo efectos negativos en las características al sacrificio ni en el rendimiento en los diferentes cortes.
To study the effect of incorporation of cassava foliage meal (CFM) at increasing levels (0; 2.5; 5 and 7.5%) in food rations for broilers on carcass traits and retail cuts yield were used 32 broilers, females, Cobb breed, with 42-d old). The analysis of variance detected significant effects (P <0.05) of level of inclusion of CFM on the head percentage. The highest values in head percentage (3.26 and 2.72%, respectively) were found with 5 and 7.5% of CFM. The inclusion of CFM only showed an increase of 6% (P <0.05) for the percentage of leg (drumstick-thigh combination) and leg quarter (with the back portion included). However, the chilled carcass yield was not affected significantly by the treatments. The use of CFM in feeding stuffs for broilers up to 7.5%, did not cause a detriment of the productive performance and did not has a negative effect on slaughter characteristics or retail cuts yields.
RESUMO
Objetivou-se, com esse trabalho, avaliar as características da carcaça de cordeiros Santa Inês, mantidos em pastagem nativa e submetidos a diferentes níveis de suplementação na dieta (1,5 por cento, 1,0 por cento e 0,0 por cento do peso vivo). Foram utilizados 24 animais, machos castrados, com peso vivo (PV) médio inicial de 15 kg ± 1,44 e idade média de 150 dias. O concentrado foi constituído à base de milho moído, farelo de soja e sal mineral. O delineamento utilizado foi inteiramente casualizado, com três tratamentos e oito repetições. A utilização da suplementação possibilitou a obtenção de cordeiros com características mais desejáveis da carcaça, como: melhor rendimento, maior área de olho de lombo, menor perda de peso no resfriamento e maior peso dos cortes comerciais. Em termos de análise econômica, pode-se concluir que, se o objetivo for obter carcaças mais leves com peso em torno de 7 kg e com nível mínimo de gordura não há necessidade de suplementação com concentrado, mas, se o objetivo for obter carcaças pesando de 10 a 12 kg e com melhor nível de acabamento recomenda-se suplementação com 1,0 a 1,5 por cento do peso vivo com concentrado.
The aim of this study was to evaluate carcass characteristics of Santa Inês lambs, maintained in native pasture and submitted to different supplementation levels in the diet (1,5 percent, 1,0 percent e 0,0 percent do LW). Twenty-four castrated sheep with 15 ±1,44 kg of mean live weight (LW) were used and average age of 150 days. The concentrate was constituted of cracked corn, soybean meal and mineral salt. A completely randomized design with three treatment and eight replicates was used. The use of the supplementation makes possible to get lambs with desirable characteristics of the carcass, such as: better yield, increase rib eye area, less lose of weight in the cooling, and greater weight of retail cuts. According to the economical analysis it may be concluded that, if the aim is to get lighter carcasses with weight around 7 kg and with minimum level of fat there is not any necessity of supplementation with concentrate, but, if the aim is to get the carcasses weighing from 10 to 12 kg and with better level of finishing, it is recommended supplementation with 1,0 to 1,5 percent of the live weight with concentrate.