Effect of essential oils on ruminal fermentation and lactation performance of dairy cows.

摘要: Three experiments (Exp.) were conducted to study the effects of dietary addition an essential oil product (EO) based on eugenol and cinnamaldehyde (0, control, or 525 mg/d Xtract 6965; Pancosma SA, Geneva, Switzerland) ruminal fermentation, total-tract digestibility, manure gas emissions, N losses, dairy cow performance. In Exp. 1 3, EO supplement was added vitamin-mineral premix. 2, top-dressed. Experiments 2 crossover designs with 20 multiparous Holstein cows each (including 4 8 ruminally cannulated cows, respectively) consisted two 28-d periods. Intake dry matter did not differ between treatments. Most fermentation parameters unaffected by EO. Concentrations ammonia (Exp. 1), isobutyrate 2), isovalerate 1) increased compared control. Apparent digestibility nutrients similar treatments, except neutral-detergent fiber, which tended be in 2. Manure emissions methane Blood plasma milk urea-N concentrations urinary losses control 1, but Average yield, 3.5% fat-corrected fat, protein, lactose treatment. Urinary excretion purine derivatives, a marker for microbial protein production rumen, greater receiving diet 120 grouped pens cows/pen 12-wk experiment Dry intake, yield (a trend slight decrease EO), components, urea N, feed efficiency Results from these studies indicate that supplementing 6965 had moderate consistently concentration increase fiber. Under conditions experiments, fed at affect composition.