Effect of fenugreek, coriander and thyme essential oils addition on microbiology of soybean meal and sunflower meal in different storage periods

Abstract

Objective: This study was organized with the aim to determine the effects of fenugreek (Trigonella foenum-graecum), coriander (Coriandrum sativum) and thyme (Thymus vulgaris) essential oils added to stored soybean meal and sunflower meal on lactic acid bacteria (LAB), yeast, mould formation, nutrient and colour changes. Methodology: In order to explore the relationship between essential oil addition and feed microbiology under different times of storage, 4×2 factorial study design was used. Thus “absence of essential oils (control group)" versus “addition of essential oils” and “storage during 30 days” versus “storage during 60 days” at 22±2°C and 55% relative humidity (HR) were compared. Results: The addition of essential oils to vegetable protein sources has a positive impact on the counts of microorganisms and nutrient composition. The addition of essential oils to sunflower and soybean meal inhibited the growth of mould. Conclusion: Feed ingredients with essential oils addition demonstrated protective effect.