Chemical composition, in vitro gas production and relative feed value of rose flower wastes (Rosa damascena Mill.) from conventional and organic production

Mariya Gerdzhikova1, Mima Todorova1, Neli Grozeva1, Ana Dobreva2 and Nadezhda Petkova3
1 Trakia University, Faculty of Agriculture, 6000 Stara Zagora, Bulgaria
2 Agricultural Academy, Institute for Roses and Aromatic Plants, 6100 Kazanlak, Bulgaria
3 University of Food Technologies, Technological Faculty, 4000 Plovdiv, Bulgaria

Abstract

Gerdzhikova, M., Todorova, M., Grozeva, N., Dobreva, A. & Petkova, N. (2022). Chemical composition, in vitro gas production and relative feed value of rose flower wastes (Rosa damascena Mill.) from conventional and organic production. Bulg. J. Agric. Sci., 28 (2), 291–298

The oil-bearing rose is one of the main essential oil crops grown in Bulgaria. During the processing of rose flowers rose oil, rose concrete, rose absolute, and rose water are obtained. Waste rose flowers after the distillation of the essential oil still have a limited usage. The objective of the present study is to determine the chemical composition, in vitro gas production, digestibility and relative feed value of waste flowers of Rosa damascena Mill. and their suitability for use as forage. The rose flowers were collected from six fields located in the Kazanlak valley, Southern Bulgaria: three of them are with organic rose production and three are conventional. After their distillation the chemical composition of rose wastes was determined: crude protein, crude fat, crude fibre, ash and nitrogen-free extracts (NFE). Comparative analysis of the chemical composition, structural fibre components: neutral detergent fibre (NDF) and acid detergent fibre (ADF), in vitro gas production and relative feed value (RFV) of rose wastes was made under the conditions of the two production systems.

Keywords: Rosa damascena Mill.; rose wastes; chemical composition; detergent fibre; in vitro gas production; relative feed value

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