*Article* **Effect of Feeding Discarded Durian Peel Ensiled with** *Lactobacillus casei TH14* **and Additives in Total Mixed Rations on Digestibility, Ruminal Fermentation, Methane Mitigation, and Nitrogen Balance of Thai Native–Anglo-Nubian Goats**

**Natcha Panyawoot <sup>1</sup> , Sarong So <sup>2</sup> , Anusorn Cherdthong <sup>2</sup> and Pin Chanjula 1,\***


**Abstract:** The objective of this study was to evaluate the effect of fermented discarded durian peel with *Lactobacillus casei* TH14, cellulase, and molasses separately or in combination in total mixed rations on feed utilization, digestibility, ruminal fermentation, and nitrogen utilization in growing crossbreed Thai Native–Anglo-Nubian goats. Five crossbreed Thai Native–Anglo-Nubian goats (50%) at 9 to 12 months of age and 20 ± 1 of body weight (BW) were assigned to a 5 × 5 Latin square design. Evaluated treatments were fermented discarded durian peel without additives (FDP), fermented discarded durian peel with 5% of molasses (FDPM), fermented discarded durian peel with 2% of cellulase (FDPC), fermented discarded durian peel with 1.0 <sup>×</sup> <sup>10</sup><sup>5</sup> cfu/g fresh matter of *L. casei* TH14 (FDPL), and fermented discarded durian peel with 5% of molasses and 1.0 <sup>×</sup> <sup>10</sup><sup>5</sup> cfu/g fresh matter of *L. casei* TH14 (FDPML). This study showed that acid detergent fiber intake was different (*p* < 0.05) between goats fed FDP and those fed FDPLM, 0.24 g/d and 0.20 g/d, respectively. The FDPML ration had significantly (*p* < 0.05) greater apparent nutrient digestibility and a better propionate concentration compared with other treatments. FDPML treatment significantly (*p* < 0.05) decreased the acetate-to-propionate ratio, methane production, and urinary nitrogen. Therefore, treated discarded durian peel with molasses and *L. casei* TH14 in combination could add 25% of dry matter into the diet for growing goats without a negative impact.

**Keywords:** goat feeding; durian peel; silage additives; propionate; methane mitigation; nitrogen balance
