Acosta Jesus A, Boyd R Dean, Patience John F
Department of Animal Science, Iowa State University, Ames, IA 50011.
Hanor Company, Franklin, KY, 42134.
Transl Anim Sci. 2021 May 6;5(2):txab080. doi: 10.1093/tas/txab080. eCollection 2021 Apr.
The approach of this experiment was to apply the regression method for the estimation of endogenous intestinal losses of ether extract (EEE) when pigs are fed complete diets ad libitum and using dietary levels of fat typical of those employed in commercial situations. A total of 40 gilts (PIC 337 sires × C22 or C29) were allotted to individual pens and randomly assigned to diets (8 pigs per treatment) with 5 different levels of acid hydrolyzed ether extract (AEE). The dietary treatments consisted of a corn-soybean meal diet with no added fat (L1); a corn-soy diet with 6% each of corn distiller's dried grains with solubles (DDGS), corn germ meal, and wheat middlings (L2); the L2 diet but with 12% each of corn DDGS, corn germ meal, and wheat middlings (L3); the L2 diet plus soybean oil to equalize the NE concentration of the L2 diet with L1 (L4); and the L3 diet plus soybean oil to equalize the NE concentration of the L3 diet with L1 (L5). Pigs received feed and water ad libitum for the growing period (initial BW = 38.5 ± 1.2 kg) and the finishing period (initial BW = 73.82 ± 2.9 kg). A quadratic broken-line model was employed to estimate the response of apparent total tract digestibility (ATTD) of AEE to dietary AEE level. The average true total tract digestibility (TTTD) of AEE and endogenous losses of AEE were estimated using regression analysis of dietary AEE intake (g/kg of DM) against apparent digested AEE (g/kg of DMI). The ATTD of AEE increased in curvilinear fashion as dietary AEE level increased in growing and in finishing pigs ( < 0.001). This suggests an influence of EEE on the ATTD of AEE estimates. The linear regression of apparent digested AEE against dietary AEE intake (L1-L5; < 0.001, = 0.99 for growing pigs and < 0.001, = 0.99 for finishing pigs) estimated greater EEE ( < 0.05) and TTTD of AEE ( < 0.05) for growing than finishing pigs. Estimated EEE from growing pigs ranged between 18.1 and 20.2 g/kg of DMI, while TTTD of AEE ranged between 96.40% and 100.70%. In finishing pigs, EEE ranged between 21.6 and 23.8 g/kg of DMI and TTTD of AEE ranged between 91.30% and 95.25%. In conclusion, EEE under practical conditions is estimated to be 19.2 g/kg of DMI in growing and 22.7 g/kg of DMI in finishing pigs.
本实验的方法是，当猪自由采食全价日粮且日粮脂肪水平为商业生产中常用水平时，应用回归方法来估算内源肠道醚提取物（EEE）损失量。总共40头后备母猪（PIC 337父系×C22或C29）被分配到个体栏中，并随机分为日粮组（每个处理8头猪），日粮含有5种不同水平的酸水解醚提取物（AEE）。日粮处理包括不添加脂肪的玉米 - 豆粕日粮（L1）；含有6%玉米干酒糟及其可溶物（DDGS）、玉米胚芽粕和小麦麸的玉米 - 豆粕日粮（L2）；L2日粮，但每种成分的含量均为12%（L3）；L2日粮加豆油，以使L2日粮的净能浓度与L1日粮相等（L4）；L3日粮加豆油，以使L3日粮的净能浓度与L1日粮相等（L5）。在生长阶段（初始体重 = 38.5 ± 1.2 kg）和育肥阶段（初始体重 = 73.82 ± 2.9 kg），猪自由采食饲料和饮水。采用二次折线模型来估算AEE的表观全肠道消化率（ATTD）对日粮AEE水平的反应。利用日粮AEE摄入量（g/kg干物质）对表观消化AEE（g/kg干物质摄入量）进行回归分析，估算AEE平均真全肠道消化率（TTTD）和AEE内源损失量。随着日粮AEE水平增加，生长猪和育肥猪的AEE的ATTD呈曲线增加（P < 0.001）。这表明EEE对AEE估算的ATTD有影响。表观消化AEE对日粮AEE摄入量进行线性回归（L1 - L5；生长猪P < 0.001，R² = 0.99；育肥猪P < 0.001，R² = 0.99），结果表明，生长猪的EEE（P < 0.05）和AEE的TTTD（P < 0.05）高于育肥猪。生长猪的EEE估计值在18.1至20. g/kg干物质摄入量之间，而AEE的TTTD在96.40%至100.70%之间。育肥猪中，EEE在21.6至23.8 g/kg干物质摄入量之间，AEE的TTTD在91.30%至95.25%之间。总之，实际条件下，生长猪的EEE估计为19.2 g/kg干物质摄入量，育肥猪为22.7 g/kg干物质摄入量。
