Performance, nutrient intake and ingestive behavior of lambs fed with different levels of soybean cake in replacement of soybean meal

AbstractThe objective of this study was to evaluate the effect of replacing soybean meal by soybean cake in diets for feedlot Santa Ines lambs, evaluating performance, nutrient intake, ingestive behavior and biometric measures. Thirty intact males were used, weighing 23.63 ± 2.44kg, distributed randomly in five treatments, with 6 animals each, with the treatments being the levels of substitution of soybean meal for soybean cake, by 0; 25; 50; 75 and 100%. The ingestive behavior was assessed by visual observations every 10 minutes, during 24 hours. No significant effects were found on the parameters of performance, DM intake, and ingestive behavior. The average daily weight gain was 312,73g, and the average dry matter intake was 1,44kg/day. The inclusion of soybean cake led to a significant linear increase in ether extract intake in grams/day, in percentage of body weight and in percentage of metabolic weight. Cubic effects were observed in the parameters of acid detergent fiber intake. The rumination, feed intake and idleness time observed were 425,85; 194,50 e 789,29 min/day, respectively. Regarding biometric measurements, there was no significant effect of replacing soybean meal with soybean cake. The soybean cake can be used in replacement of soybean meal, but is important to pay attention on the content of residual lipids present in this byproduct of the biodiesel industry.摘要本研究旨在评估日粮中以豆饼替代豆粕对舍饲育肥圣塔伊内斯（Santa Ines）羔羊的影响，考察其生产性能、营养物质摄入量、采食行为及体尺指标。本研究选取30只未去势公羔，初始体重为23.63±2.44kg，随机分为5个处理组，每组6只，各处理组的豆饼替代豆粕比例分别为0%、25%、50%、75%及100%。采食行为通过每10分钟一次的目视观察进行评估，观测总时长为24小时。结果表明，生产性能、干物质（Dry Matter, DM）采食量及采食行为相关参数均未检测到显著影响。试验羔羊的平均日增重为312.73g，平均干物质采食量为1.44kg/天。日粮中添加豆饼可使以克/天、体重百分比及代谢体重（metabolic weight）百分比计的乙醚提取物（ether extract）摄入量呈现显著的线性升高趋势。酸性洗涤纤维（acid detergent fiber）摄入量相关参数则呈现三次效应。观测到的反刍时间、采食时间及空闲时间分别为425.85min/天、194.50min/天及789.29min/天。关于体尺指标，豆饼替代豆粕未产生显著影响。豆饼作为生物柴油工业的副产物，可用于替代豆粕，但需注意其残留脂质的含量。