Nutrition plays an important role in determining the metabolic status of the animals, thus also reflecting on animal welfare as well as on livestock performance (Celi et al., 2017). Indeed, in addition to the ration, natural substances can be also used as a supplement in order to modulate the rumen fermentation and to improve milk yield (Arowolo & He, 2018). Goats fed on high-quality and valuable forage provide the production of high-quality milk and dairy products.Natural substances can be also used as nutritional supplements to this purpose, but most of the research has been performed on housed animals (Olagaray & Bradford, 2019). Nevertheless, the influence on the performance can be variable, depending on many factors such as the dosage, diet composition, forage to concentrate