不同来源可发酵碳水化合物和可降解氮合成瘤胃微生物蛋白质效率的研究

STUDIES ON THE SYNTHETIC EFFICIENCIES OF RUMEN MICROBIAL PROTEIN FROM VARIOUS SOURCES OF FERMENTABLE CARBOHYDRATES AND EDGRADABLE NITROGENS

本论文研究了不同来源可发酵碳水化合物和可降解氮合成瘤胃微生物蛋白质的效率，结果表明，６种不同粗饲料和精粗比日粮的可发酵碳水化合物合成微生物氮的效率相似（Ｐ＞０．０５），平均值为２５．９１ｇＭＮ／ｋｇＦＣＨ＿２Ｏ。７种不同可降解氮源合成微生物氮的效率差异显著（Ｐ＜０．０５），豆饼日粮最高为０．９１，尿素日粮最低，为０．６６；缓释技术能使尿素可降解氦的利用效率提高到０．８４６９（Ｐ＜０．０５）。瘤胃内可发酵碳水化合物和可降解氮之间的匹配模型为：ＭＮ／ＲＤＮ（ｇ／ｇ）＝２．２０９８－０．９６３７１ｇＲＤＮ／ＦＣＨ＿２Ｏ（ｇ／ｋｇ）（ｎ＝１３，ｒ＝－０．８８７３）该模型可作为建立新的反刍家畜饲料评定体系和日粮配合体系的理论基础。

The synthetic efficiencies of rumen microbial protein from various sources offermentable carbohydrate(FCH2O)and degradable nitrogens(RDN)were studied.Theresults showed that different sources of FCH2O from the six diets had similar effici-encies for microbial nitrogen (MN) synthesis (P<0.05), with the average of 25.91gMN/kg FCH2O. The RDN efficiencies of the seven diets converted to MN were signific-antly different (P<0.05), in which the SBM diet had the highest value of 0.91 andthe urea diet with the lowest of 0.66. The FCH2O-RDN model of MNIRDN=2.2098-0.96371g RDN/FCH2O (n=13, r= - 0.8873) was first established here in this field. Itwill be the theoretical basis for the development of a new feed evaluation and dietformulation system.