Performance and carcass characteristics of two biotypes of Santa Inês sheep grazing pasture supplemented with multinutritional blocks

SUMMARY The objective of this study was to evaluate the performance and carcass characteristics of Santa Inês lambs fed pasture supplemented with multinutritional blocks (MB). Twenty whole lambs were used, 10 of the Santa Inês Tradicional and 10 Santa Inês Moderno biotypes. These were distributed in a completely randomized design, where they remained until reaching the slaughtering age of 264 days. Although they had different biotypes, sheep did not differ statistically for performance variables, quantitative, qualitative, morphometry, biometrics, only the palette yield variable was higher for the biotype in 19. 75%, while for the traditional one it was 19. 18%. Increasing use of the multinutritional block was observed by lambs up to 56 days of experiment, reaching a maximum of 0.240g/animal/day, but at 84 days there was a decline to 0.198g/animal/day. The average daily gain (ADG) was 144.22 and 146.67 for the traditional and modem biotypes, respectively, and the final weight (FW) was 32. 26 and 32. 66kg for each biotype. The carcass of the animals is moderate and therefore a lean carcass. The gross profit margin was 78 reais/animal. Despite the biotypic differences, the Santa Inês lambs fed pasture and supplemented with multinutritional blocks showed similar carcass characteristics.

摘要：本研究旨在评估饲喂添加多营养块（multinutritional blocks, MB）牧草的圣塔伊内斯羔羊的生产性能与胴体特性。试验选取20只未去势羔羊，分为圣塔伊内斯传统型（Santa Inês Tradicional）与现代型（Santa Inês Moderno）两个生物型，每组各10只。采用完全随机试验设计，试验周期至羔羊达到264日龄屠宰标准。尽管两个生物型存在差异，但羔羊的生产性能指标、量化性状、质构特性、形态计量学与生物测量学指标均无统计学差异；仅现代型生物型的臀肉产率为19.75%，传统型为19.18%，前者略高。试验前56日，羔羊对多营养块的采食量逐步升高，最高达0.240克/只·日；但在试验第84日时，采食量下降至0.198克/只·日。传统型与现代型生物型羔羊的平均日增重（average daily gain, ADG）分别为144.22与146.67，终末体重（final weight, FW）分别为32.26与32.66千克。受试羔羊的胴体肥瘦程度适中，属于瘦型胴体。单只羔羊的毛利润为78雷亚尔。尽管存在生物型差异，但饲喂添加多营养块牧草的圣塔伊内斯羔羊，其胴体特性并无显著差异。