本试验旨在通过消化试验来评定早稻和晚稻在生长獭兔上的营养价值。选择18只60日龄、平均体重为（1.50±0.20）kg的健康状况良好的白色獭兔，随机分为3组（每组6个重复，每个重复1只），分别饲喂基础饲粮、早稻饲粮（85%基础饲粮+15%早稻）、晚稻饲粮（85%基础饲粮+15%晚稻）。预试期和正试期各7 d。采用全收粪法测定生长獭兔对早稻和晚稻中主要营养物质的表观消化率。结果显示：1）早稻与晚稻中总能（GE）、干物质（DM）、粗蛋白质（CP）、粗脂肪（EE）、粗纤维（CF）、中性洗涤纤维（NDF）、酸性洗涤纤维（ADF）、酸性洗涤木质素（ADL）、粗灰分（Ash）、钙（Ca）、磷（P）、无氮浸出物（NFE）的含量分别为16.25 MJ/kg、86.32%、7.82%、1.32%、8.54%、23.35%、10.54%、1.54%、3.58%、0.53%、0.38%、64.76%与16.07 MJ/kg、89.17%、6.88%、1.32%、9.07%、24.55%、11.57%、2.01%、3.96%、0.62%、0.21%、63.71%。2）早稻和晚稻在生长獭兔中的表观消化能分别为10.43和10.32 MJ/kg，生长獭兔对早稻和晚稻中GE、DM、CP、EE、CF、NDF、ADF、Ash、Ca、P、NFE的表观消化率分别为65.33%、74.32%、76.69%、68.59%、13.12%、38.63%、27.11%、52.23%、50.03%、15.54%、74.35%与64.22%、76.15%、70.92%、72.93%、14.35%、38.49%、27.09%、52.03%、48.63%、14.99%、73.64%。由上可知，早稻和晚稻中主要营养物质含量差异较小，生长獭兔对早稻和晚稻主要营养物质的表观消化率基本相当；早稻和晚稻均可以作为生长獭兔的能量饲料来源，二者对生长獭兔的营养价值相近。

This trial was carried out to evaluate the nutritional value of early rice and late rice for growing Rex rabbits by digestion experiment. Eighteen healthy and white growing Rex rabbits at the age of 60 days with an average body weight (1.50±0.20) kg were randomly divided into 3 groups with 6 replicates per group and 1 rabbit per replicate. The rabbits in the 3 groups were fed with basal diet, early rice diet (85% basal diet+15% early rice) and late rice diet (85% basal diet+15% late rice), respectively. Both pre-trial and formal trial periods lasted for 7 d. The apparent digestibility of main nutrients in early rice and late rice for growing Rex rabbits was measured by total feces collection method. The results showed as follows:1) the contents of gross energy (GE), dry matter (DM), crude protein (CP), ether extract (EE), crude fiber (CF), neutral detergent fiber (NDF), acid detergent fiber (ADF), acid detergent lignin (ADL), crude ash (Ash), calcium (Ca), phosphorus (P) and nitrogen free extract (NFE) of early rice were 16.25 MJ/kg, 86.32%, 7.82%, 1.32%, 8.54%, 23.35%, 10.54%, 1.54%, 3.58%, 0.53%, 0.38% and 64.76%, respectively, and those of late rice were 16.07 MJ/kg, 89.17%, 6.88%, 1.32%, 9.07%, 24.55%, 11.57%, 2.01%, 3.96%, 0.62%, 0.21% and 63.71%, respectively. 2) The apparent digestible energy and the apparent digestibility of GE, DM, CP, EE, CF, NDF, ADF, Ash, Ca, P and NFE of early rice for growing Rex rabbits were 10.43 MJ/kg, 65.33%, 74.32%, 76.69%, 68.59%, 13.12%, 38.63%, 27.11%, 52.23%, 50.03%, 15.54% and 74.35%, respectively, and those of late rice were 10.32 MJ/kg, 64.22%, 76.15%, 70.92%, 72.93%, 14.35%, 38.49%, 27.09%, 52.03%, 48.63%, 14.99% and 73.64%, respectively. In conclusion, the contents of major nutrients in early rice and late rice have no significant difference. Combined with the comprehensive analysis of two kinds of raw materials, the apparent digestibility of major nutrients in early rice and late rice for growing Rex rabbits are basically the same. Therefore, the nutritional value of early rice is close to late rice, and both of them can be used as the source of energy feed for growing Rex rabbits.