Department of Animal Sciences, Wageningen University, Wageningen, The Netherlands.
Physiol Behav. 2012 Sep 10;107(2):218-30. doi: 10.1016/j.physbeh.2012.07.001. Epub 2012 Jul 10.
The satiating effects of dietary fiber may depend more on physicochemical properties of the fiber than on total fiber intake. These properties are expected to affect satiety feelings and feeding motivation due to different effects in the gastrointestinal tract. The aim of the current study was to assess the effects of fibers with varying physicochemical properties (bulkiness, viscosity and fermentability) on feeding motivation in adult female pigs. Sixteen pair-housed pigs received four diets: lignocellulose (LC), pectin (PEC), resistant starch (RS), and control (C) without fiber, in four periods in a Latin square design. Each fiber was fed at a low (L) followed by a high (H) inclusion level (7 days each). At 1h, 3h, and 7h after the morning meal, feeding motivation was assessed in an operant test, where turning a wheel yielded multiple food rewards, and in a runway test, where walking a fixed U-shaped track yielded one food reward. Pigs were observed in their home pen for 6h, using 90-s instantaneous scan sampling. In the operant test, throughout the day feeding motivation was higher for pigs on PEC compared with pigs on LC. In the runway, feeding motivation increased particularly at 1h after the meal for pigs on PEC compared with pigs on RS. Also at 7h, feeding motivation tended to decrease for pigs on RS compared with pigs fed other diets. In their home pen, pigs on PEC showed more feeder-directed behavior compared with pigs on RS. In conclusion, PEC was the least satiating fiber. LC and RS, despite a lower supply of available energy, were the most satiating fibers, possibly due to their bulky and fermentation properties, respectively.
膳食纤维的饱腹感效应可能更多地取决于纤维的物理化学特性，而不是膳食纤维的总摄入量。这些特性预计会通过在胃肠道中产生不同的影响来影响饱腹感和摄食动机。本研究的目的是评估具有不同物理化学特性（膨松度、粘性和发酵性）的纤维对成年雌性猪摄食动机的影响。16 头同窝饲养的猪接受了四种饮食：木质纤维素（LC）、果胶（PEC）、抗性淀粉（RS）和无纤维对照（C），在拉丁方设计的四个时期内进行。每种纤维在低（L）和高（H）添加水平（各 7 天）下进行喂养。在早餐后 1 小时、3 小时和 7 小时，在操作性测试中评估摄食动机，其中转动轮子可获得多个食物奖励，在跑道测试中，走固定的 U 形轨道可获得一个食物奖励。使用 90 秒即时扫描采样，在猪的家圈中观察猪 6 小时。在操作性测试中，与 LC 相比，PEC 组的猪全天摄食动机更高。在跑道测试中，与 RS 相比，PEC 组的猪在饭后 1 小时的摄食动机特别增加。此外，与其他饮食相比，RS 组的猪在 7 小时时的摄食动机有下降的趋势。在它们的家圈中，与 RS 组的猪相比，PEC 组的猪表现出更多的饲料导向行为。总之，PEC 是最不饱腹的纤维。LC 和 RS 尽管可提供的能量供应较低，但却是最饱腹的纤维，可能分别是由于它们的膨松度和发酵特性。
