ABSTRACT The objective of this study was to determine the endogenous fat loss (EFL) and to calculate true total tract digestibility (TTTD) of fat in mink (Neovison vison) using soybean oil–based diets with different fat levels. In the digestibility assay, four diets with 6.30%, 13.9%, 22.0% and 34.0% fat in dry matter were used. Sixteen adult male mink were distributed in a complete randomised design. The apparent total tract digestibility (ATTD) of dietary fat was 90.8%, 95.9%, 96.9% and 97.8%, respectively. The apparent total digestible fat was linearly related to dietary fat intake (r2 = 0.99). The EFL was estimated from the slope of the regression equation and was determined to be 5.09 g/kg DM intake. The TTTD of soybean oil was determined to be 99.3%. Therefore, TTTD values will have negligible impact in feed formulation as they are close to ATTD values with the dietary fat levels normally used for mink.

中文翻译：

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测定水貂中脂肪的内源性脂肪损失和真实的总消化道消化率（Neovison vison）

摘要 本研究的目的是确定内源性脂肪损失 (EFL) 并计算水貂脂肪 (Neovison vison) 的真实总消化道消化率 (TTTD)，使用不同脂肪水平的豆油日粮。在消化率测定中，使用了干物质中脂肪含量分别为 6.30%、13.9%、22.0% 和 34.0% 的四种日粮。16 只成年雄性水貂分布在一个完整的随机设计中。膳食脂肪的表观总消化率（ATTD）分别为90.8%、95.9%、96.9%和97.8%。表观总可消化脂肪与膳食脂肪摄入量呈线性相关（r2 = 0.99）。EFL 是根据回归方程的斜率估算的，并确定为 5.09 g/kg DM 摄入量。大豆油的 TTTD 测定为 99.3%。所以，