本试验旨在研究玉米青贮与花生秧配比对奶牛瘤胃中花生秧降解特性的影响。选择4头体重、生理状态、生产性能相近,装有永久瘤胃瘘管的中国荷斯坦奶牛,分别饲喂含有玉米青贮与花生秧不同配比的全混合日粮(TMR),3种TMR中玉米青贮与花生秧的干物质(DM)配比分别为3.9:1.0(A组)、1.2:1.0(B组)、0.4:1.0(C组)。试验分3期进行,依次进行A、B、C组试验。每期预试15 d,采样期4 d;共57 d。采用尼龙袋瘤胃降解技术测定花生秧在奶牛瘤胃中DM、粗蛋白质(CP)、中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的72 h瘤胃降解率,并求得目标养分的动态降解参数及有效降解率。结果表明:1)花生秧的DM在瘤胃中有效降解率为56.49%~59.62%,CP为40.45%~47.36%,NDF为33.26%~35.20%,ADF为36.31%~37.45%。2)B组DM的有效降解率显著高于C组(P<0.05),极显著高于A组(P<0.01);B、C组的CP有效降解率显著高于A组(P<0.05)。3)B、C组的NDF快速降解部分含量显著高于A组(P<0.05);3种TMR对花生秧粗NDF和ADF有效降解率无显著影响(P>0.05)。由此可见,花生秧具有较高的饲用价值。本试验条件下,玉米青贮与花生秧DM配比为1.2:1.0时,可有效提高花生秧DM和CP的瘤胃降解率。

This experiment was conducted to investigate the effects of ratio of corn silage to peanut vine on degradation characteristics of peanut vine in rumen of dairy cows. Four healthy Chinese Holstein dairy cows fitted with permanent rumen cannula were selected to feed different total mixed rations (TMRs), and they had similar body weight and production performance and were in the same physiological status. The ratio of corn silage to peanut vine of TMRs was 3.9:1.0 (group A), 1.2:1.0 (group B), 0.4:1.0 (group C), respectively [dry matter (DM) basis]. The experiment was divided into three periods, each period was conducted to carry out the experiment for each group (groups A, B and C in order). The experiment lasted for 57 d, each period had 15 d pre-experimental period and 4 d sampling period. Ruminal degradation rates of DM, crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) of peanut vine in 72 h were estimated by the nylon bag technique, and their dynamic degradation parameters and effective degradation rate were figured out. The results showed as follows: 1) effective degradation rates of DM, CP, NDF and ADF was 56.49% to 59.62%, 40.45% to 47.36%, 33.26% to 35.20%, and 36.31% to 37.45%, respectively. 2) Effective degradation rate of DM of group B was significantly higher than that of group C (P<0.05), and extremely significantly higher than that of group A (P<0.01). Effective degradation rate of CP of groups B and C was significantly higher than that of group A (P<0.05). 3) Rapid degradation fraction content of NDF of groups B and C was significantly higher than that of group A (P<0.05). It is concluded that peanut vine has high feeding value. Degradation rates of DM and CP of peanut vine can be efficiently increased when ratio of corn silage to peanut vine is 1.2:1.0.