瘤胃持续模拟装置测定低质粗饲料发酵规律的研究

用瘤胃模拟技术研究不同喂料方式及不同粗饲料对发酵罐内ｐＨ值，氨氮（ＮＨ３－Ｎ）浓度，总氮（ＴＮ）浓度及挥发性脂肪酸（ＶＦＡ）的影响。选用２５ｇ喂料量，分别以稻草，羊草和麦秸为被测日粮，比较５２μｍ尼龙袋法，散放法和２５０μｍ尼龙袋法３种喂料方式对发酵罐内粗饲料发酵规律的影响。结果ｐＨ值散放法最高，２４小时为７．２８～７．５０，２５０μｍ尼龙袋法最低，为７．０５～７．１５。２４小时ＶＦＡ浓度是散放法最低，分别为稻草组２８．０９ｍｍｏｌ／Ｌ，羊草组３０．０４ｍｍｏｌ／Ｌ，麦秸组２７．０１ｍｍｏｌ／Ｌ，２５０μｍ尼龙袋法最高，分别为稻草组３１．０６ｍｍｏｌ／Ｌ，羊草组３２．２７ｍｍｏｌ／Ｌ，麦秸组３０．００ｍｍｏｌ／Ｌ。结果表明３种喂料方式中２５０μｍ尼龙袋法效果最佳，３种低质粗饲料中羊草营养价值最高。

Studies on Rumen Fermentation of Roughages with Rumen Simulation Technique

The rumen simulation instrumentRSIwas used to study the different roughages, different feeding methods on the rumen fermentation parameters, such as pH, NH3N, total nitrogenTN and volatile fatty acidVFA. 25g rice straw, Chinese Aneurolepidium or wheat straw was used to compare the effect of three feeding methods, namely 52m nylon bag, scattering method and 250m nylon bag.Two vessels were as one group. Results show that at 24 hours, pH value was 7.287.50 by scattering method, 7.057.15 by 250m nylonbag; VFA concentration was lowest by scattering method, being 28.09, 30.04 and 27.01 mmol/L, respectively with rice straw, Chinese Aneurolepidium and wheat straw. VFA concentration was highest by 250m nylonbag, being 31.06,32.27 and 30.00mmol/L, respectively with rice straw, Chinese Aneurolepidium and wheat straw. Results of NH3N and TN concentration were similar with VFA. The results indicate that 250m nylonbag was the best feeding method and the nutritional value of Chinese Aneurolepidium was the best of the three roughages.