Baer D J, Oftedal O T, Rumpler W V, Ullrey D E
National Zoological Park, Department of Zoological Research, Washington, DC 20008, USA.
J Nutr. 1997 Aug;127(8):1501-7. doi: 10.1093/jn/127.8.1501.
Herbivory is an uncommon feeding strategy in lizards. Appropriate diet formulations for captive lizards should be based on performance measures, yet few data are available on the effect of plant fiber on food intake, nutrient utilization and growth of captive herbivorous lizards. This study was conducted to determine the effect of three levels of dietary fiber on dry matter intake, nutrient and energy metabolizability and growth rate of the green iguana (Iguana iguana). Twenty-one captive iguanas were fed nutritionally complete diets containing three levels of dietary fiber: 19, 24, and 27% neutral detergent fiber. The iguanas were fed each diet for at least 12 wk, and total excreta were collected for 11.3 +/- 4.0 d (means +/- , range of 7 to 25 d). Diets and excreta were analyzed for dry matter, organic matter, gross energy, neutral detergent fiber, acid detergent fiber, and acid detergent lignin. The study was designed as a Latin square crossover. Across all diets, dry matter intake was proportional to body mass1.0 (BM). Growth rate was greater (P < 0. 05) when iguanas were fed the low and medium fiber diets (2.2 and 2. 4 g/d, respectively) than when fed the high fiber diet (1.4 g/d). However, mean daily dry matter intake of the three diets [7.2 g/(d. kg BM)] was not different. In general, digestibility of fiber fractions and the metabolizability of dietary energy decreased (P < 0.05) as the level of dietary fiber increased. These data suggest that a diet containing less than 27% neutral detergent fiber should be fed if rapid growth is to be sustained during intensive captive production of green iguanas.
食草是蜥蜴中一种不常见的摄食策略。适合圈养蜥蜴的饮食配方应以性能指标为依据，但关于植物纤维对圈养食草蜥蜴食物摄入量、营养利用和生长的影响的数据却很少。本研究旨在确定三种膳食纤维水平对绿鬣蜥（Iguana iguana）干物质摄入量、营养和能量代谢率以及生长速率的影响。给21只圈养鬣蜥喂食营养全面的饮食，其中包含三种膳食纤维水平：19%、24%和27%的中性洗涤纤维。每种饮食喂养鬣蜥至少12周，并收集11.3±4.0天（平均值±标准差，范围为7至25天）的全部排泄物。分析饮食和排泄物中的干物质、有机物、总能、中性洗涤纤维、酸性洗涤纤维和酸性洗涤木质素。该研究设计为拉丁方交叉试验。在所有饮食中，干物质摄入量与体重的1.0次方（BM）成正比。当鬣蜥喂食低纤维和中纤维饮食（分别为2.2和2.4克/天）时，生长速率高于喂食高纤维饮食（1.4克/天）时（P<0.05）。然而，三种饮食的平均每日干物质摄入量[7.2克/（天·千克体重）]没有差异。一般来说，随着膳食纤维水平的增加，纤维组分的消化率和饮食能量的代谢率降低（P<0.05）。这些数据表明，如果要在绿鬣蜥的集约化圈养生产中维持快速生长，应喂食中性洗涤纤维含量低于27%的饮食。
