摘要
本试验旨在研究黑麦草、牛鞭草、甘薯蔓、玉米秸青贮、玉米秸秆和稻草共6种肉牛常用粗饲料的瘤胃降解特性和瘤胃非降解蛋白质(RUP)的小肠消化率。选用3头装有永久性瘤胃瘘管的宣汉阉公牛为试验动物,采用尼龙袋技术评定6种粗饲料的干物质(DM)、粗蛋白质(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)瘤胃降解率,并用改进三步法评价RUP的小肠消化率。结果表明:1)黑麦草和甘薯蔓DM有效降解率较高,并与依次降低的牛鞭草、玉米秸青贮、玉米秸秆和稻草差异显著(P<0.05)。CP有效降解率和ADF有效降解率以黑麦草最高,且与依次降低的甘薯蔓、牛鞭草、玉米秸青贮、玉米秸秆和稻草差异显著(P<0.05)。NDF有效降解率为黑麦草>甘薯蔓>玉米秸青贮>牛鞭草>稻草>玉米秸秆,各粗饲料间差异显著(P<0.05)。2)牛鞭草、玉米秸秆和稻草RUP的小肠消化率差异不显著(P>0.05),并显著高于依次降低的玉米秸青贮、黑麦草和甘薯蔓(P<0.05)。小肠可消化粗蛋白质含量为黑麦草>甘薯蔓>牛鞭草>玉米秸青贮>玉米秸秆>稻草,各粗饲料间差异显著(P<0.05)。由此可见,不同粗饲料瘤胃降解特性不同,为小肠提供可消化粗蛋白质的潜力也不同。黑麦草的DM、CP、NDF和ADF在瘤胃的有效降解率最高,牛鞭草、玉米秸秆和稻草RUP的小肠消化率较高,黑麦草和甘薯蔓小肠可消化粗蛋白质含量较高。
This experiment was conducted to determine the ruminal degradation characteristics and small intesti-nal digestibility of rumen undegraded protein（ RUP）of 6 kinds of commonly used roughages：ryegrass,hem-arthria compressa,sweet potato stem,corn stover silage,corn stover and rice straw. Three Xuanhan steers fit-ted with permanent ruminal cannulas were used. Nylon-bag technique was used to evaluate the ruminal degrad-ability and effective digestibility of dry matter（ DM）,crude protein（ CP）,neutral detergent fiber（ NDF）and acid detergent fibre（ ADF）. Modified three-step in vitro method was used to evaluate small intestinal digestibil-ity of RUP of the roughages. The results showed as follows：1）the DM effective degradability of ryegrass and sweet potato stem was significantly higher than that of hemarthria compressa,corn stover silage,corn stover and rice straw（ P〈0.05）,which were decreased in the above order. CP effective degradability and ADF effec-tive degradability of ryegrass were significantly higher than those of sweet potato stem,hemarthria compressa, corn stover silage,corn stover and rice straw（ P〈0.05）,which were decreased in the above order. NDF effec-tive degradability showed ryegrass 〉 sweet potato stem 〉 corn straw silage 〉 hemarthria compressa 〉 corn sto-ver 〉 rice straw,and the differences among roughages were significant（ P〈0.05）. 2）The small intestinal di-gestibility of RUP of hemarthria compressa,corn stover and rice straw was not significantly different（ P〉0.05）,and was significantly higher than that of corn stover silage,ryegrass and sweet potato stem（ P〈0.05）, which was decreased in the above order. Intestinal digestible CP content of showed ryegrass 〉 sweet potato stem 〉hemarthria compressa 〉corn stover silage 〉corn stover 〉rice straw ,and the differences among rough-ages were significant（P〈0.05）. In conclusion,ruminal degradation characteristics of roughages are dissimi-lar,and the potential that can provide digestible crude protein for small intestine is different. The effective de-gradability of DM,CP,NDF and ADF of ryegrass is the highest,small intestinal digestibility of RUP of hem-arthria compressa,corn stover and rice straw is higher,and ryegrass and sweet potato stem have higher intesti-nal digestible crude protein content.
出处
《动物营养学报》
CAS
CSCD
北大核心
2014年第8期2145-2154,共10页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
农业部公益性行业(农业)科研专项经费(20090300608)
关键词
粗饲料
尼龙袋技术
瘤胃降解率
改进三步法
瘤胃非降解蛋白质的小肠消化率
roughages
nylon-bag technique
ruminal degradability
modified three-step method
small intes-tinal digestibility of rumen undegraded protein
