Abstract: This study evaluated the effect of incorporating a Bentonite (Proteck a bioactive mineral-based feed additive, manufactured by Elanco, Greenfield, IN) into the finisher diet and its impact on pig performance in a commercial farm setting. Previous research has demonstrated that Proteck can enhance both performance and gut microbiota in pigs (Rong et al., 2019, 2021). In this study, Bentonite was added to the finisher diet at a concentration of 0.4 kg per metric ton during the final six weeks before marketing. The evaluation took place at a Site III farm in northwestern Mexico (Sonora State) with a capacity for 8,000 pigs, featuring eight identical buildings with uniform facilities and equipment. Pigs from four buildings received the Bentonite-enhanced diet, while pigs in the remaining four buildings were fed a standard Control diet. Daily feed delivery was monitored, and feed remaining was measured at the experiment's conclusion. Individual pig weights were recorded at the start of the finisher diet and prior to marketing. Statistical analyses were conducted using t-tests and Chi-square tests with JMP 18.1.0; differences were considered significant at P < 0.05 and trends at P < 0.10. Results (Table 1) indicated a 4.8% improvement in Feed Conversion for pigs receiving Bentonite, although this difference was not statistically significant (P > 0.05). Average daily gain (ADG) showed a tendency to increase in Bentonite group (1.019 kg vs. 1.112 kg ± 0.057; P = 0.059). Additionally, there was a trend towards reduced days in the pen for pigs fed Bentonite (40.5 vs. 36.7 days ± 2.5; P = 0.076). Under the conditions of this field study, this Bentonite demonstrated a potential to enhance finishing pig performance, warranting further evaluations in commercial settings to confirm its benefits.
