Apparent MEn and oil digestibility of hulled sunflower seed (SFS) and the products derived from the oil extraction process: press extracted SFS (PESFS), sunflower seed meal (SFSM), and press and solvent oils (PO and SO) were determined with 198 cockerels. Recombined products (mix of meal and oil) were also evaluated to study the effect of the 2 consecutive oil extraction steps. Each foodstuff was included in a basal diet, according to the proportions resulting from processing, at 100, 200, and 300 g SFS/kg. 2. Dietary energy value and digestible fat content were linearly related to rate of inclusion of test ingredients. Extrapolation values for AMEn (MJ/kg DM) were: SFS, 16.20; PESFS, 9.46; SFSM, 7.62. A decreasing quadratic trend was also found in the AMEn of PESFS, with interpolation values ranging from 11.77 to 9.33 MJ/kg DM between 70 and 210 g/kg DM of inclusion. No differences were observed between PO and SO. The AMEn of of sunflower oil, calculated from its digestibility, was 33.70 MJ/kg DM. 3. The oil extraction process affected the nutritional value of sunflower products. Recombined materials showed greater values than original foodstuffs: R-SFS, 17.47; R-PESFS, 11.49 MJ/kg DM. The increase in oil digestibility (from 0.814 to 0.862 g/kg DM in SFS; from 0.778 to 0.892 in PESFS) accounted for most of the increase observed in AMEn values. 4. As the form in which oil is incorporated in diets (released or within SFS or PESFS) affects the utilisation of sunflower products, their nutritional value is less than maximal and should not be calculated from their ingredients. Solvent oil seems to be the less available fraction of sunflower oil within SFS as the effect of the 2nd extraction proved to be greater than that of the previous press extraction.
摘要
用198只公鸡测定了带壳向日葵籽（SFS）及其油脂提取过程中产生的产品（压榨提取的SFS（PESFS）、向日葵籽粕（SFSM）以及压榨油和溶剂油（PO和SO））的表观代谢能（AMEn）和油脂消化率。还对重组产品（粕和油的混合物）进行了评估，以研究连续两步油脂提取的效果。根据加工过程中产生的比例，将每种饲料以100、200和300 g SFS/kg的比例添加到基础日粮中。2. 日粮能量值和可消化脂肪含量与试验成分的添加比例呈线性关系。AMEn（MJ/kg干物质）的外推值为：SFS，16.20；PESFS，9.46；SFSM，7.62。在PESFS的AMEn中也发现了二次下降趋势，在70至210 g/kg干物质的添加量之间，内插值范围为11.77至9.33 MJ/kg干物质。未观察到PO和SO之间存在差异。根据向日葵油的消化率计算得出，其AMEn为33.70 MJ/kg干物质。3. 油脂提取过程影响了向日葵产品的营养价值。重组材料的值高于原始饲料：R-SFS为17.47；R-PESFS为11.49 MJ/kg干物质。油脂消化率的提高（SFS中从0.814提高到0.862 g/kg干物质；PESFS中从0.
