金针菇菌渣对山羊饲粮养分表观消化率及氮平衡的影响

Effects of Enoki mushroom Residues on Dietary Nutrient Apparent Digestibility and Nitrogen Balance of Goats

本试验旨在研究不同金针菇菌渣添加比例对山羊饲粮养分表观消化率及氮平衡的影响。选用4只体重为（22.5±0.6）kg的波尔山羊×徐淮山羊（波杂山羊）,采用4×4拉丁方设计,金针菇菌渣在饲粮中的添加比例分别为0（对照）、15%、25%和40%,用于替代稻草,4组饲粮营养水平接近;试验分为4期,每期15 d,其中预试期10 d,正试期5 d。结果表明：1）与对照组比较,饲粮金针菇菌渣添加比例为15%、25%和40%时对山羊的钙、磷表观消化率无显著影响（P〉0.05）,但能够显著提高干物质、有机物、中性洗涤纤维、酸性洗涤纤维以及总能表观消化率（P〈0.05）,且这些指标随金针菇菌渣比例的升高逐渐降低。2）与对照组比较,饲粮金针菇菌渣添加比例为15%、25%和40%时显著提高了山羊氮沉积率以及氮生物学价值（P〈0.05）,且这2个指标随金针菇菌渣比例的升高逐渐降低。结果提示,在饲粮中添加金针菇菌渣可以提高山羊对营养物质消化率;在本试验条件下,金针菇菌渣在山羊饲粮中的最适宜添加比例为15%-25%。

This study was aimed to investigate the effects of Enoki mushroom residues on dietary nutrient apparent digestibility and nitrogen balance of goats.Four healthy goats（Boer goats×Xuhuai goats） with an average body weight of（22.5 ＋ 0.6） kg were used in a 4x4 Latin square design.The addition proportion of Enoki mushroom residues in diets was 0（control）,15%,25%and 40%,respectively,which was to substitute straw,and four diets had similar nutrient levels.The experiment included four stages with 15 d per stage（10 d for preliminary trial and 5 d for formal trial）.The results showed as follows：1） compared with control group,dietary addition of Enoki mushroom residues at 15%,25%and 40%had no significant effect on apparent digestibility of calcium（Ca） and P（phosphorus）（P〉0.05）,but could significantly increase apparent digestibility of dry matter（DM）,organic matter（OM）,neutral detergent fiber（NDF）,acid detergent fiber（ADF） and gross energy（P〈0.05）,which reduced gradually with the proportion of Enoki mushroom residues increasing.2） Compared with control group,dietary addition of Enoki mushroom residues at 15%,25%and40%could significantly increase nitrogen retention rate and nitrogen biological value（P〈0.05）,which reduced gradually with the proportion of Enoki mushroom residues increasing.It is concluded that dietary addition of Enoki mushroom residues can increase nutrient digestibility of goats;the optimum proportion in diet for goats is 15%to 25%.