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Journal of the Hellenic Veterinary Medical Society, vol.75, no.2, pp.7471-7478, 2024 (SCI-Expanded)
This study evaluated the effect of Hypericum perforatum oil (HPO) on chemical composition, fermentation traits and metabolic energy, in vitro organic matter digestibility, and net energy lactation of Hungarian vetch-wheat silages. The treatments were: (i) control (No HPO), (ii) 20 mg/kg HPO, (iii) 40 mg/kg HPO, (iv) 80 mg/kg HPO and (v) 160 mg/kg HPO in Hungarian vetch-wheat silages. After 75 days of ensiling, dry matter, neutral detergent fiber, and acid detergent fiber were increased by adding 20 mg/kg and 40 mg/kg Hypericum perforatum oil to Hungarian vetch-wheat silage (p<0.01). However, there was no significant in the content of silage in lactic acid, acetic acid, propionic acid, metabolic energy, in vitro organic matter digestibility, and net energy lactation (p>0.05). Butyric acid and ammonia nitrogen were not found in the experiment silages. Finally, it was concluded that the addition of 20 mg/kg Hypericum perforatum oil may have a positive effect on the quality of Hungarian vetch-wheat silages.