日粮纤维水平对鹅内源氨基酸排泄量和氨基酸真消化率的影响

Effect of Dietary Fiber Level on Endogenous Amino Acid Excretion and Amino Acid True Digestibility for the Goose

30只42日龄鹅为试验动物，以砻糠和玉米秸秆为主要纤维源，在日粮等能量等蛋白的前提下，采用同位素示踪技术，研究了不同日粮粗纤维水平（3％、5％、7％、9％和11％）对鹅内源氨基酸排泄量和氨基酸真消化率的影响。结果表明，内源氨基酸排泄量指标，CF11组（最高）比CF3组（最低）升高了92．13％（P〈0．01）；氨基酸真消化率指标，CF11组（最低）比CF5组（最高）降低了39．88％（P〈0．01）；粗纤维水平在3％。7％范围内随粗纤维水平增加，鹅内源氨基酸排泄量有升高的趋势，但差异不显著（P〉0．05），氨基酸真消化率较高且较稳定（P〉0．05）；粗纤维在7％-11％范围内随着粗纤维水平的增加，内源氨基酸排泄量极显著升高（P〈0．01），氨基酸真消化率极显著降低（P〈0．01）。

Rice hull meal and corn stalk meal as the main sources of fiber, thirty 42 - day geese as experimental animals and isotopic tracer technique as research method, were used to study for the first time the effect of diets containing different crude fiber levels （3 %, 5 %, 7 % , 9%, 11% ） with equal energy and protein on geese endogenous amino acid excretion and true digestibility of amino acid. Results show that： to the index of endogenous amino acid excretion, CF11 group （highest） than CF3 group （lowest） increases by 92.13% （ P 〈 0.01 ） ; to the index of true digestibility of amino acids, CF11 group （minimum） than CF5 group （maximum） decreases by 39.88 % （ P 〈 0.01 ） ; CF level in the range from 3 % to 7%, with the crude fiber levels increasing, the geese endogenous amino acid excretion is on the rise, but the difference is not significant （P 〉 0.05）, and the true digestibility of amino acid is higher and more stable（P 〉 0.05）; CF level in the range from 7% to 11%, with the crude fiber levels rising, the endogenous amino acid excretion increases extremely significantly （P 〈 0.01 ）, and the true digestibility of amino acid decreases extremely significantly （P 〈 0.01 ）.