Desempenho e caracter赤sticas histoqu赤micas do tecido muscular esquel谷tico de cordeiras terminadas em diferentes sistemas = Performance and histochemical characteristics of the skeletal muscle tissue of lambs finished under different systems

作者：Graziela Aparecida Santello; Francisco de Assis Fonseca de Macedo; Fabio Jacobs Dias; Alexandre Agostinho Mexia

来源：Acta Scientiarum - Animal Sciences, 2009.

• desempenho
• fibras musculares
• modula o de fibras
• modulation fibers
• muscle fibers
• performance

Verificou-se o sistema de termina o de 44 cordeiras Dorset Santa In那s na freq邦那ncia, diametro de fibras musculares esquel谷ticas e desempenho. Amostras do m迆sculo semitendinosus foram coletadas para an芍lise do diametro, frequ那ncia e efeito de modula o das fibras musculares do desmame e abate. As cordeiras foram divididas em dois sistemas de termina o. Pastagem com suplementa o (1,5% PV) com 27,01% PB e 4,51 Mcal de EB kg-1 MS e no confinamento receberam ra o (4% PV) com 15,56% de PB e 4,32 Mcal de EB kg-1 MS. O ganho de peso m谷dio di芍rio (GPMD) foi de 0,157 e 0,148 kg para confinamento (CT) epastagem mais suplementa o (PS), respectivamente. Os diametros 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 米m. Frequ那ncia 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%. Correla o positiva entre o ganho m谷dio di芍rio das cordeiras conforme ocorreu aumento no diametro das fibras, tanto para CT e PS. Para a vari芍vel GPMD, as cordeiras podem ser terminadas, tanto no confinamento ou na pastagem mais suplementa o.As caracter赤sticas morfol車gicas, histoqu赤micas e efeito de modula o foram semelhantes, para qualquer um dos sistemas de termina o. Verify the effect of the termination system the forty-four Dorset Santa In那s 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 de 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 米m, 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 characteristicsand modulation effect were similar, for either of the two finishing systems.