Abstract
Three lactating multiparous Sannen dairy goats in late lactation (146±7 days of milk) were used in a 3×3 Latin square design to determine the effects of abomasal infusion of cottonseed oil and dietary enzyme supplementation on milk yield and composition. Treatments were twice daily abomasal infusion of 1. 50 ml d -1 water plus 5 g kemzyme enzyme kg -1
Highlights
Several studies have shown that fibrolytic enzymes can increase milk yield in dairy cows fed forage-based (Schingoethe et al, 1999; Yang et al, 1999), and concentrate-based diets (Rode et al, 1999)
Enzyme supplementation increased (P
The mechanism with which the abomasal oil infusion reduces DMI is not fully understood, it has been suggested that this reduction in intake was probably due to increased level of some circulating gut peptide such as cholecystokinin (Palmquist, 1994; Benson et al, 2001) or increased plasma concentrations of glucagon-like peptide 1 (Litherland et al, 2005), neither of which were measured in this experiment
Summary
Several studies have shown that fibrolytic enzymes can increase milk yield in dairy cows fed forage-based (Schingoethe et al, 1999; Yang et al, 1999), and concentrate-based diets (Rode et al, 1999). Increased dry matter intake (DMI) with dietary enzyme supplementation have been observed in several studies (e.g., Lewis et al, 1999; Beauchemin et al, 2000). Other authors have reported no effects of dietary enzyme supplementation on DMI (Rode et al, 1999; Kung et al, 2000, 2002). The objective of this study, was to determine the effects of abomasal infusion of cottonseed oil and dietary enzyme supplementation on DMI, plasma metabolite and milk yield and composition in dairy goats
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