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This study aimed to evaluate in vitro and in vivo dietary supplementation with different levels of natural or nano-zeolite forms on rumen fermentation patterns and nutrient digestibility. In the in vitro experiment, a basal diet (50% concentrate: 50% forage) was incubated without additives (control) and with natural zeolite (10, 20, 30 g/kg DM) or nano-zeolite (0.2, 0.3, 0.4, 0.5, 1.0 g/kg DM) for 24 h to assess their effect on ruminal fermentation, feed degradability, and gas and methane production using a semi-automatic system of in vitro gas production (GP). The most effective doses obtained from the in vitro experiment were evaluated in vivo using 30 Barki goats (26 ± 0.9 SE kg body weight). Goats were allocated into three dietary treatments ( n = 10/treatment) as follows: control (basal diet without any supplementations), natural zeolite (20 g/kg DM diet), and nano-zeolite (0.40 g/kg DM diet). The in vitro results revealed that only the nano-zeolite supplementation form quadratically ( p  = 0.004) increased GP, and the level of 0.5 g/kg DM had the highest GP value compared to the control. Both zeolite forms affected the CH 4 production, linear, and quadratic reductions ( p &lt; 0.05) in CH 4 (mL/g DM), consistent with linear increases in truly degraded organic matter (TDOM) ( p = 0.09), and propionate molar proportions ( p = 0.007) were observed by nano zeolite treatment, while the natural form of zeolite resulted in a linear CH 4 reduction consistent with a linear decrease ( p = 0.004) in NH 3 -N, linear increases in TDOM ( p = 0.09), and propionate molar proportions ( p = 0.004). Results of the in vivo experiment demonstrated that the nutrient digestibility was similar among all treatments. Nano zeolite enhanced ( p &lt; 0.05) the total short-chain fatty acids and butyrate concentrations, while both zeolite forms decreased ( p &lt; 0.001) NH 3 -N compared to the control. These results suggested that both zeolite supplementation forms favorably modified the rumen fermentation in different patterns.

animals

In Vitro and In Vivo Assessment of Dietary Supplementation of Both Natural or Nano-Zeolite in Goat Diets: Effects on Ruminal Fermentation and Nutrients Digestibility