[Use of defatted corngerm with and without the addition of an enzyme complex in dog diets]

ABSTRACT The objective was to evaluate the apparent digestibility coefficient (ADC) of nutrients, diet palatability and fecal characteristics of dogs fed diets containing degreased germ (DG), and a control diet (DC) - both with and without the addition of enzyme complex (amylase, xylanase, betaglucanase and mananase). For the digestibility and fecal characteristics experiment 12 adult dogs were used, distributed in a randomized block design, in a 2 x 2 factorial scheme (diet x enzyme). The second experiment evaluated palatability using the first choice and ingestion ratio (IR) of DC diet vs. 20%gD, using 16 dogs. The palatability test had three consecutive days, totaling 48 repetitions. The diet with inclusion of 20% DG had the lowest ADC values of DM, GE and ME (P <0.05). Inclusion of the enzyme complex improved ADC of DM, GE and ME (P <0.05). No differences in fecal characteristics were observed (P >0.05). Regarding palatability, dogs preferred the 20% DG diet in both first choice and IR (P <0.05). Inclusion of enzymes in diets improves nutrient digestibility and ME, being an additive with potential use in dog food.

摘要 本研究旨在评估饲喂含脱脂胚芽（degreased germ, DG）日粮与对照日粮（control diet, DC）时，犬的营养素表观消化率系数（apparent digestibility coefficient, ADC）、日粮适口性及粪便特性，两种日粮均分别设置添加与不添加酶复合物（包含淀粉酶、木聚糖酶、β-葡聚糖酶与甘露聚糖酶）两个组别。消化率与粪便特性试验选用12只成年犬，采用随机区组设计，设置2×2因子试验方案（日粮类型×酶制剂添加）。适口性试验选用16只犬，通过首次选择法与摄食率（ingestion ratio, IR）对比对照日粮与20%脱脂胚芽日粮的适口性，试验连续开展3天，总计48次重复。饲喂含20%脱脂胚芽的日粮时，犬的干物质（dry matter, DM）、总能（gross energy, GE）与代谢能（metabolizable energy, ME）的表观消化率系数最低（P<0.05）；添加酶复合物可显著提升上述三种指标的表观消化率系数（P<0.05）。粪便特性未观察到显著组间差异（P>0.05）。就适口性而言，无论采用首次选择法还是摄食率指标，犬均更偏好添加20%脱脂胚芽的日粮（P<0.05）。日粮中添加酶复合物可改善营养素消化率与代谢能，是一种具备犬粮应用潜力的添加剂。