Effects of different amounts of crude glycerol supplementation on dry matter intake, milk yield, and milk quality of lactating dairy cows grazing on a Kikuyu grass pasture

The aim of this study was to determine the effects different amounts crude glycerol (CGL) on dry matter intake, milk yield, protein and fatty acid profile dairy cows grazing a Kikuyu-based pasture. Six Holstein were used in first third lactation (mean ± SD 559 22.5 kg body weight, 43 10 days milk, 26.8 1.2 milk/day) randomized within replicated 3 × Latin square arrangement. Animals grazed Kikuyu grass supplemented with commercial energy-protein concentrate at 1.0 kg/4.0 milk. experimental period 69 days. following treatments administered: CGL0 (control, without glycerol), CGL1 (750 g/cow/day), CGL2 (1,500 g/cow/day). addition 750 1,500 g CGL did not affect intake (P > 0.05). However, yield (FCM 3.5%) increased by 14.2% group compared that obtained control (CGL0) = 0.02). diet resulted 2.1% greater treatment 0.01). Further, impact fat concentration, or composition < Thus, inclusion as co-product may be nutritional strategy increase productivity production systems tropical perennials, such grass.