Nutritive value of elephant grass (Pennisetum purpureum Schum.) cv. Taiwan silage with the addition of a fermentation inhibitor and two stimulants

Aguilhera Sosa, R.; Llamas Lamas, G.; Shimada Miyasaka, A.S.

Tecnica Pecuaria en Mexico 30(3): 196-207


Accession: 002446008

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Three experiments studied the effects of adding a carbohydrate source (molasses or sorghum) at 4 or 8% and zinc bacitracin at 0 or 5 p.p.m. on ensiling characteristics of P. purpureum. In the first experiment, the level and source of carbohydrate affected (P<0.01) the pH, DM, ethanol, acetic acid and lactic acid contents. Added carbohydrate lowered the acetic acid content (P<0.01), while butyric acid content was higher in the sorghum treatment and the control. Lactic acid was higher (3.6%) with molasses at 8%. The interaction between source and level of carbohydrate was significant (P<0.01) for DM, CP, ethanol, acetic acid and lactic acid, molasses giving the better effect. The interaction between carbohydrate source and zinc bacitracin decreased the butyric acid content only in the molasses treatment. In the second experiment, fattening Pelibuey rams were used to evaluate 3 silages: sorghum forage (SF) as control, P. purpureum cv. Taiwan + 8% molasses (TM) and Taiwan + 8% molasses + 5 p.p.m. zinc bacitracin (TMB). The liveweight gains for the 3 forages were similar (P>0.05). The voluntary intake was higher (P>0.05) for TM and TMB (660 and 646 g DM animal-1 d-1, respectively) than for SF (526 g). In the third experiment, the in vitro rate of digestion of the silages in experiment 2 was determined. The indigestible fibre content was 42.9, 31.1 and 31.9% while the Kd of the potentially digestible fibre was 7.2, 7.9 and 8.4%/h for SF, TM and TMB, respectively.