本试验旨在采用等比例回归法测定肉鸡对豆油、猪油、磷脂油和混合油（豆油：猪油为1：1）的回肠末端消化能（IDE）、代谢能（ME）和氮校正代谢能（MEn）。选用体重（640±1）g、健康的21日龄爱拔益加（AA）肉母鸡576只，随机分为1个对照组和8个试验组，每组8个重复，每个重复8只鸡。对照组饲喂基础饲粮，试验组分别饲喂以豆油、猪油、磷脂油和混合油（豆油：猪油为1：1）替代4%或8%基础饲粮的新饲粮。对照组和各试验组饲粮配方中玉米与豆粕的比例保持不变，均为12.04：7.00；指示剂为二氧化钛（TiO₂），添加比例为0.5%。连续收集3 d（25~27日龄）的排泄物，测定干物质、氮、能量的利用率，计算ME和MEn；28日龄时屠宰鸡只，取回肠末端食糜，测定干物质、氮、能量利用率，计算IDE。结果表明：回肠末端食糜和全肠道排泄物中干物质、氮和能量利用率以及IDE、ME和MEn与豆油替代比例存在极显著的线性关系（P<0.01）；回肠末端食糜中干物质和能量利用率以及IDE与猪油替代比例存在极显著的二次曲线关系（P<0.01），全肠道排泄物中干物质、氮、能量利用率以及ME和MEn与猪油替代比例存在极显著的线性和二次曲线关系（P<0.01）；回肠末端食糜中干物质、氮和能量利用率以及IDE与磷脂油替代比例存在极显著的线性和二次曲线关系（P<0.01），全肠道排泄物中干物质、氮、能量利用率以及ME和MEn与磷脂油替代比例存在极显著的线性关系（P<0.01）；回肠末端食糜和全肠道排泄物中干物质、氮、能量利用率以及IDE、ME和MEn与混合油替代比例存在极显著的线性和二次曲线关系（P<0.01）。根据豆油、猪油、磷脂油和混合油替代基础饲粮的比例与新饲粮中由豆油、猪油、磷脂油和混合油所提供的能量的对应关系，得到豆油、猪油、磷脂油和混合油的IDE、ME和MEn的回归方程为：ME=0.14_（0.01）+33.66_（1.46）豆油替代比例+38.82_（1.53）猪油替代比例+39.90_（1.52）磷脂油替代比例+50.83_（1.83）混合油替代比例，R²=0.951；MEn=0.10_（0.01）+32.84_（1.27）豆油替代比例+37.58_（1.44）猪油替代比例+38.22_（1.43）磷脂油替代比例+49.75_（1.43）混合油替代比例，R²=0.954；IDE=0.43_（0.02）+41.35_（3.10）豆油替代比例+41.05_（3.25）猪油替代比例+41.87_（3.21）磷脂油替代比例+44.23_（3.22）混合油替代比例，R²=0.811。根据上述回归方程得出，肉仔鸡对豆油的IDE、ME和MEn分别为41.35、33.66和32.84 MJ/kg DM；对猪油的IDE、ME和MEn分别为41.05、38.82和37.58 MJ/kg DM；对磷脂油的IDE、ME和MEn分别为41.87、39.90和38.22 MJ/kg DM；对混合油的IDE、ME和MEn分别为44.23、50.83和49.75 MJ/kg DM。

This experiment was conducted to evaluate the ileal digestible energy (IDE), metabolic energy (ME) and nitrogen-corrected metabolizable energy (MEn) of soybean oil, lard, phospholipid oil and mixed oil (soybean oil:lard=1:1) for broiler chickens. A total of 576 female Arbor Acres broiler chickens with the body of (640±1) g and at the age of 21 days were randomly divided into one control group and eight trial groups, and each group had eight replicates with eight birds per replicate. Broiler chickens in the control group were fed a basal diet, while those in trial groups were fed new diets. The new diets were prepared using soybean oil, lard, phosphatide oil and blend oil replaced 4% or 8% basal diet, respectively. The ratio of corn to soybean meal in diets of control group and trial groups was the same, which was 12.04:7.00. Titanium dioxide (TiO₂) was used as an indicator added into diets, and the adding level was 0.5%. Excreta was collected on 25, 26 and 27 days of age for measuring the utilization rates of dry matter, nitrogen and energy and calculating the ME and MEn. At the 28 days of age, all birds were slaughtered, and the chyme was collected from the distal ileum for measuring utilization rates of dry matter, nitrogen and energy and calculating the IDE. The results showed that there were extremely significant linear relationships between the soybean oil replacement proportion and the utilization rates of dry matter, nitrogen and energy in chyme from the distal ileum and total intestinal excreta, IDE, ME and MEn (P<0.01); there were extremely significant quadratic relationships between the lard replacement proportion and the utilization rates of dry matte and energy in chyme from the distal ileum and IDE (P<0.01), and there were extremely significant linear and quadratic relationships between the lard replacement proportion and the utilization rates of dry matter, nitrogen and energy in total intestinal excreta and ME, MEn (P<0.01); there were extremely significant linear and quadratic relationships between the phosphatide oil replacement proportion and the utilization rates of dry matter, nitrogen and energy in chyme from the distal ileum and IDE (P<0.01), and there were extremely significant linear relationships between the phosphatide oil replacement proportion and the utilization rates of dry matter, nitrogen and energy in total intestinal excreta and ME, MEn (P<0.01); there were extremely significant linear and quadratic relationships between the blend oil replacement proportion and the utilization rates of dry matter, nitrogen and energy in chyme from the distal ileum and total intestinal excreta, IDE, ME and MEn (P<0.01). Then, according to the proportion of basal diet replacement by correlation between soybean oil, lard, phosphatide oil and blend oil and the energy supplied by soybean oil, lard, phosphatide oil and blend oil in new diets, the regression equations for ME, MEn and IDE of soybean oil, lard, phosphatide oil and blend oil was obtained as follows: ME=0.14_(0.01)+33.66_(1.46) soybean oil replacement proportion+38.82_(1.53) lard replacement proportion+39.90_(1.52) phosphatide oil replacement proportion+50.83_(1.83) blend oil replacement proportion, R²=0.951; MEn=0.10_(0.01)+32.84_(1.27) soybean oil replacement proportion+37.58_(1.44) lard replacement proportion+38.22_(1.43) phosphatide oil replacement proportion+49.75_(1.43) blend oil replacement proportion, R²=0.954; IDE=0.43_(0.02)+41.35_(3.10) soybean oil replacement proportion+41.05_(3.25) lard replacement proportion+41.87_(3.21) phosphatide oil replacement proportion+44.23_(3.22) blend oil replacement proportion, R²=0.811. According to the above regression equation, the IDE, ME and MEn for soybean oil are 41.35, 41.35 and 32.84 MJ/kg DM, respectively; for lard are 41.05, 38.82 and 37.58 MJ/kg DM, respectively; for phosphatide oil are 41.87, 39.90 and 38.22 MJ/kg DM, respectively; and for blend oil are 44.23, 50.83 and 49.75 MJ/kg DM, respectively.