Volatile compounds in herbage intake by goats in two different grazing seasons | Composés volatils de l'herbe ingérée par des chèvres au pâturage au cours de deux saisons
2005
Fedele, V.(Istituto Sperimentale per la Zootecnia, Muro Lucano (PZ), (Italy)) | Claps, S. | Rubino, R. | Sepe, L. | Cifuni, C.F.
Fifteen lactating goats grazed 8 hours/day on 1.2 ha, from March to middle spring and from middle spring to early June. Artificial diets were formed on the basis of grazing behaviours on five areas of 2x2 m. The contribution of each species to the diet was estimated by the ratio number of plants grazed/number of plants present before grazing. Volatile organic compounds concentrations, analysed by HRGC-MS, were maximum in spring, when herbage was composed especially by dicotyledons and by apical leaves, flower bud and flowers. Alcohols and ketones were the most abundant compounds in winter and spring. In winter, monoterpenes were higher than sesquiterpenes, in spring the situation inverted. Alcohol, ketone and monoterpene profiles were the same in both seasons. In winter five sesquiterpenes were found in grazed herbage, while in spring 21. Season and animal behaviour were the dominant factors influencing the richness in secondary metabolites in grazed herbage
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