The physical form of the diet and level of straw in fattening total mixed rations (TMR) can influence sorting behavior and rumen morphometry. Therefore, the objectives of this experiment were to evaluate two levels of wheat straw (WS) in conventional and pelleted TMR on feed sorting behavior, rumen morphometry, the thickness of stratum corneum (SC), and color of reticulorumen mucosa. Thirty-two Beetle male goats (8 goats/treatment) were assigned to one of the four treatments in a 2 × 2 factorial arrangement: CTMR15 and CTMR 25 (conventional TMR containing 15 and 25 % WS, respectively), the PTMR15 and PTMR25 (pelleted TMR containing 15 and 25 % WS, respectively). In PTMR, the WS was ground to 8 mm and then pelleted. Feed sorting behavior of goats fed conventional TMR was evaluated twice weekly using Penn State Particle Separator (PSPS). At the end of the experiment, goats (n = 8/treatment) were slaughtered and rumen tissues preserved for further rumen morphometric examination. The CTMR25 fed goats consumed more medium (< 19,> 8 mm) and short (> 1.18) particles. There was a significant interaction (P < 0.05) between physical form (PF) of the diet and straw level (SL) for papillae length (PL), papillae density (PD), and surface area. The PL was greater (P < 0.05) in PTMR15 and PTMR25 compared with CTMR15 and CTMR25. Additionally, PD and surface area were higher (P < 0.05) in PTMR15 than the rest of the treatments. However, the papillae width (PW) was not affected (P> 0.05) by the PF or the SL in the diet. The thickness of stratum corneum (SC) (18.55 μm) was highest (P < 0.05) in the PTMR15 compared with the PTMR25, CTMR15, and CTMR25. Lightness (L*), redness (a*), and yellowness (b*) values for reticulorumen mucosa color were greater (P < 0.05) in CTMR15 and CTMR25 than PTMR25 and PTMR15. In conclusion, fattening goats fed on conventional TMR selected for medium and short fiber particles. Feeding PTMR15 resulted in a greater PL, PD; however, a thickened SC and darker mucosa color of rumen and reticulum was also observed in goats fed on pelleted TMR.

日粮的物理形式和加脂总混合日粮（TMR）中秸秆的水平会影响分选行为和瘤胃形态。因此，本实验的目的是评估常规和制粒TMR中的两种小麦秸秆（WS）的饲料分选行为，瘤胃形态，角质层厚度（SC）和网状粘膜颜色。将三十二只甲虫雄性山羊（每只处理8只山羊）以2×2因子分配方式分配给四种处理之一：CTMR15和CTMR 25（常规TMR分别包含WS的15％和25％），PTMR15和PTMR25（含15％和25％WS的颗粒TMR）。在PTMR中，将WS研磨至8 mm，然后制粒。使用宾夕法尼亚州立颗粒分离器（PSPS）每周两次评估饲喂常规TMR的山羊的饲料分选行为。实验结束时，对山羊（每处理8只）进行屠宰，并保存瘤胃组织以进行进一步的瘤胃形态测定。用CTMR25喂养的山羊消耗了更多的中粒（<19，> 8 mm）和短粒（> 1.18）。进行了重大互动（饮食的物理形式（PF）与秸秆水平（SL）之间的P <0.05），以显示乳头长度（PL），乳头密度（PD）和表面积。与CTMR15和CTMR25相比，PTMR15和PTMR25中的PL更大（P < 0.05）。此外，PTMR15中的PD和表面积均高于其余治疗（P < 0.05）。然而，日粮中的PF或SL对乳头宽度（PW）没有影响（P> 0.05）。与PTMR25，CTMR15和CTMR25相比，PTMR15中的角质层（SC）厚度最高（18.55μm）（P < 0.05）。网状粘膜颜色的亮度（L *），红色（a *）和黄色（b *）值较大（与PTMR25和PTMR15相比，CTMR15和CTMR25中的P < 0.05）。总之，选择常规TMR喂养的增肥山羊适合中短纤维颗粒。饲喂PTMR15会导致更大的PL，PD；然而，在以颗粒TMR喂养的山羊中也观察到SC增厚，瘤胃和网状的粘膜颜色变深。