氨化稻草日粮中甲醛处理菜籽饼与豆饼蛋白质利用效率的比较研究

Efficiencyofutilizationofnitrogenofformaldehyde-treatedrapeseedmealascomparedwithtreatedsoybeanmealinammonistedricestrawdietbyHu-sheep

用六头湖羊按３ｘ３复拉丁方设计，比较研究了氨化稻草日粮中甲醛处理菜籽饼和豆饼蛋白质的利用效率。试验日粮Ｄ－Ｉ、Ｄ－Ⅱ和Ｄ－Ⅲ均包含６００ｇ氨化稻草和１００ｇ混合精料为基础料，并等氮补充不同的蛋白源：Ｄ－Ⅰ补充２００ｇ甲醛处理菜籽饼（ＴＲＳＭ）；Ｄ－Ⅱ补充１００ｇＴＲＳＭ和９５ｇ甲醛处理豆饼（ＴＳＢＭ）；Ｄ－Ⅲ补充１９０ｇＴＳＢＭ。各日粮间在干物质、有机物质和精蛋白质的消化率、可消化氮利用率以及氮的沉积率上均无显著差异（Ｐ＞０．０５）．各日粮间氮和干物质的瘤胃降解率相同，瘤胃液氨态氮浓度也没有发现日粮间的明显差异。饲喂Ｄ－Ⅰ日粮的试羊，血浆游离氨基酸和必需氨基酸浓度略高于采食日粮Ｄ－Ⅱ和Ｄ－Ⅲ的试羊，但三者间差异不显著（Ｐ＞０．０５）．综上所述认为作为氨化稻草日粮的蛋白质补充料，甲醛处理菜籽饼与处理豆饼具有相同的蛋白质利用效率。

SixHu-sheepwereusedinadouble3×3Latinsquaredesigntoevaluatetheefficiencyofutil-izationofnitrogen(N)fromformaldehyde(HCHO)-treatedrapeseedmeal(TRSM)incomparisonwiththeHCHO-treatedsoybeanmeal(TSBM).Allthree.experimentaldiets(D-Ⅰ.D-ⅡandD-Ⅲ)con-tained600gammoniabicarbonate-treatedricestrawand100gconcentratemixture.Theyweresupple-mentedisonitrogenouslywithTRSMand/orTSBM.200gTRSMindietDⅠ,100gTRSMplus95gTSBMindietD-Ⅱand190gTSBMindietD-Ⅲ,respectively.Therewerenosignificantdifferencesamongdietsinapparentdigestibilityofdrymatter,organicmatterandcrudeprotein.efficiencyofutiliza-tionofthedigestibleNandNretention(P>0.05).TherumendegradationofNfromdietD-Ⅰwassimi-lartothatfromdietD-ⅡorD-Ⅲ,Averageammonia-NconcentrationsintherumenfluidofanimalsfeddietD-ⅠwerenotdifferentfromthoseondieD-ⅡorD-Ⅲ(P>0.05).ThelambsreceivingdietD-ⅠhadslightlyhigherconcentrationsofplasmafreeaminoacidsandessentialaminoacidsthanthoseondietD-ⅡorD-Ⅲ,butthedifferencerevealednostatisticalsigniftcance(P>0.05).ItisconcludedthattheHCH0-treatedrapeseedmealcancomparefavourablywiththetreatedSBMintermofthenutrientsdigestibilityandNutilization,whengivenasaproteinsourcetosheepreceivingammoniated.ricestraw.