Boguhn Jeannette, Kluth H, Steinhöfel O, Peterhänsel Martina, Rodehutscord M
Institut für Ernährungswissenschaften, Martin-Luther-Universität Halle-Wittenberg, Germany.
Arch Tierernahr. 2003 Aug;57(4):253-66. doi: 10.1080/00039420310001594405.
The aim of the present study was to determine equations that predict ME in total mixed rations (TMR) based on routine methods. The ME content of 30 TMR for dairy cows was determined based on digestible crude nutrients obtained with wether sheep. Concentrations in the TMR (in g/kg DM) varied between 118 and 234 for crude protein, 26 and 48 for crude lipid, 131 and 250 for crude fibre, 281 and 488 for NDF, and 173 and 304 for ADF. Gas production ranged from 40.7 to 54.1 ml/200 mg DM, and enzymatically degraded organic matter from 652 to 800 g/kg DM. Digestibility [%] ranged from 68.6 to 84.0 for organic matter, from 55.6 to 84.3 for crude lipid, from 55.0 to 77.8 for crude fibre, from 57.6 to 77.0 for NDF and from 53.1 to 79.6 for ADF. ME ranged from 9.6 to 11.9 MJ/kg DM, and NEL from 5.7 to 7.4 MJ/kg DM. ME content was highly correlated with the concentration of both crude fibre and enzymatically degradable organic matter as well as with organic matter digestibility. A multiple regression equation based on crude fibre and crude lipid predicted ME with a reasonable goodness of fit (r2 = 0.81; s(y.x) = 2.4%). The inclusion of other nutrients, of neutral and acid detergent fibre, neither of gas production did improve the goodness of fit. The best prediction was achieved with inclusion of enzymatically degraded organic matter (r2 = 0.90; s(y.x) = 1.7%).
本研究的目的是基于常规方法确定能够预测全混合日粮（TMR）中代谢能（ME）的方程。根据用阉羊测得的可消化粗养分，测定了30种奶牛全混合日粮的代谢能含量。全混合日粮中各成分的浓度（以g/kg干物质计）如下：粗蛋白为118至234，粗脂肪为26至48，粗纤维为131至250，中性洗涤纤维为281至488，酸性洗涤纤维为173至304。产气量为40.7至54.1 ml/200 mg干物质，酶解有机物为652至800 g/kg干物质。有机物消化率为68.6%至84.0%，粗脂肪为55.6%至84.3%，粗纤维为55.0%至77.8%，中性洗涤纤维为57.6%至77.0%，酸性洗涤纤维为53.1%至79.6%。代谢能为9.6至11.9 MJ/kg干物质，净能为5.7至7.4 MJ/kg干物质。代谢能含量与粗纤维、酶解有机物浓度以及有机物消化率均高度相关。基于粗纤维和粗脂肪的多元回归方程对代谢能的预测具有合理的拟合优度（r2 = 0.81；s(y.x) = 2.4%）。纳入其他养分、中性和酸性洗涤纤维以及产气量均未改善拟合优度。纳入酶解有机物时预测效果最佳（r2 = 0.90；s(y.x) = 1.7%）。
