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Verify the effect of the termination system the forty-four ½ Dorset Santa Inês lambs in the frequency, diameter of skeletal muscular fibers and performance. Samples  the semitendinosus muscle were collected for diameter analysis, frequency and modulation effect  at weaning and slaughter. After weaned, the lambs were distributed in two finishing systems. Feedlot received ration (4% BW) with 15.56% of CP and 4.32 Mcal of GE kg-1 of DM, while those on pasture received supplementation (1.5% BW) with 27.01% CP and 4.51 Mcal of GE kg-1 of DM. The average daily gain (ADG) was 0.157 and 0.148 kg for feedlot (TF) and pasture + supplementation (PS). The diameters of skeletal muscle fibers SO, FOG and FG for TF and PS were 29.04 and 28.55, 34.46 and 35.80, and 38.81 and 40.96 µm, respectively. Frequency of skeletal muscle fibers SO, FOG and FG for TF and PS, were 19.32 and 21.35, 43.88 and 43.53, and 36.80 and 35.12%, respectively. Positive correlation was verified for lamb performance with the diameter, both for CT and PS. For the ADG variable, lambs could be either finished on TF or PS. The morphological and histochemical characteristics and modulation effect were similar, for either of the two finishing systems.Verificou-se o sistema de terminação de 44 cordeiras ½ Dorset Santa Inês na freqüência, diâmetro de fibras musculares esqueléticas e desempenho. Amostras do músculo semitendinosus foram coletadas para análise do diâmetro, frequência e efeito de modulação das fibras musculares do desmame e abate. As cordeiras foram divididas em dois sistemas de terminação. Pastagem com suplementação (1,5% PV) com 27,01% PB e 4,51 Mcal de EB kg-1 MS e no confinamento receberam ração (4% PV) com 15,56% de PB e 4,32 Mcal de EB kg-1 MS. O ganho de peso médio diário (GPMD) foi de 0,157 e 0,148 kg para confinamento (CT) e pastagem mais suplementação (PS), respectivamente. Os diâmetros das fibras  SO, FOG e FG para CT e PS, foram, respectivamente, 29,04 e 28,55, 34,46 e 35,80 e 38,81 e 40,96 µm. Frequência das fibras SO, FOG e FG para CT e SO, foram, respectivamente, 19,32 e 21,35, 43,88 e 43,53 e 36,80 e 35,12%. Correlação positiva entre o ganho médio diário das cordeiras conforme ocorreu aumento no diâmetro das fibras, tanto para CT e PS. Para a variável GPMD, as cordeiras podem ser terminadas, tanto no confinamento ou na pastagem mais suplementação. As características morfológicas, histoquímicas e efeito de modulação foram semelhantes, para qualquer um dos sistemas de terminação

Desempenho e características histoquímicas do tecido muscular esquelético de cordeiras terminadas em diferentes sistemas