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This study was conducted to determine the silage quality, in vitro digestibility and energy content of forage turnip (Brassicarapa) ensiled with molasses or ground barley. Forage turnip was harvested at three different stages: the beginning, middle and end of theflowering period, and it was ensiled with no additive (control), 5% molasses or 4% ground barley. In the trial, pH, nutrient contents, ammonia nitrogen (NH3-N) contents, volatile fatty acid (VFA) contents, Fleig scores, in vitro digestibility and energy content were determined. It was observed that the effect of the vegetative stage on the difference between the groups was significant (p < 0.05). Accordingly,with the progression of the vegetative stage, the contents of dry matter (DM), organic matter (OM), ether extract (EE), neutral detergentfiber (NDF) and acid detergent fiber (ADF) showed an increase while a decrease was observed in crude protein (CP). The effects of theadditives on the difference between the groups were found to be significant except for the CP parameter (p < 0.05). Molasses and barleyaddition to the silages increased DM, OM and EE contents and reduced the levels of NDF and ADF. With the progression of the vegetative stage, lactic acid (LA) and acetic acid (AA) values decreased while pH values and Fleig scores increased. The effects of additives werefound to be insignificant for all parameters except for AA and Fleig scores. As the vegetative stage progressed, the dry matter digestibility(DMD), organic matter digestibility (OMD), digestible energy (DE), metabolic energy (ME) and net energy for lactation (NEL) valuesof the silages decreased significantly (p < 0.05). The addition of molasses or barley, compared to the control, resulted in a significantincrease in the levels of DMD, OMD, DE, ME, and NEL (p < 0.05). In conclusion, in parallel with the progression of the vegetative stage,the DMD, OMD, DE, ME, and NEL values of the silages decreased, increasing with the addition of the additives, and the obtained silageswere of high-quality as alternative quality roughage in ruminant feeding. |
