阉牛不同日粮的纤维消化、瘤胃内VFA对甲烷产生量的影响

Effects of Fiber Digestion and VFA in the Rumen on the Methane Production in Steers of Different Type of Diets

装有瘤胃和真胃瘘管的成年阉牛４头，体重（５００±５０）ｋｇ，采用４×４完全拉丁方试验设计，在呼吸代谢室内就不同日粮的纤维消化、瘤胃内ＶＦＡ对甲烷产生量的影响进行了研究。结果表明：（１）可消化中性洗涤纤维（ＤＮＤＦ）和可消化酸性洗涤纤维（ＤＡＤＦ）的甲烷产生量，在不同加工细度羊草之间（７．５ｍｍ，１５ｍｍ，３５ｍｍ和长草）无显著差异（Ｐ＞０．０５）。（２）不同精粗比日粮（０∶１００，２５∶７５，５０∶５０，７５∶２５）的ＮＤＦ或ＡＤＦ降解量（ｋｇ／ｄ）与甲烷产生量呈较高的线性正相关（ｒ＝０．８６８９或ｒ＝０．９７７５），乙酸、丙酸、乙酸＋丙酸产量（ｍｏｌ／ｄ）以及乙酸／丙酸与ＣＨ４产生量（Ｌ／ｄ）之间均存在较高的线性相关（ｒ依次为０．９６９１，－０．９６８３，０．９７８９，０．８８３３）。

In a 4×4 latin square design four steers (500±50) kg with permanent rumen and abomasum cannulae were fed on the different type of diets to study the effects of fiber digestion and VFA in the rumen on the methane production. The results showed: (1) The methane production of digestible NDF and ADF of different particle sizes of Chinese wildrye (7.5 mm, 15 mm, 35 mm, long hay) had no significant difference (P>0.05). (2) There was higher linear positive correlation (r=0.8689 or r=0.9775) between amount of degraded NDF or ADF (kg/d) of different concentrate∶roughage ration and methane production (L/d); There were higher linear correlation (r=0.9691, -0.9683, 0.8833) among the amounts of acetic, propionic, acetic plus propionic, acetic: propionic and methane production (L/d).