Increasing dietary levels of citral oil on nutrient total tract digestibility, ruminal fermentation, and milk composition in Saanen goats

•Four incrementing doses of high purity citral oil (CO) were evaluated.•CO consumption by goats linearly decreased neutral detergent fiber digestibility.•CO showed a quadratic positive effect on rumen propionate concentration.•CO had neither effect on milk yield nor composition of goats.•CO had no effects on milk fatty acid profile.