Ruminal Degradability and Intestinal Digestibility of Dm and Cp in High-Protein Fraction from Sunflower Meal - A Cheap Source of Dietary Protein for Ruminants

S unflower meal (SFM) is a basic and cheap source of feed protein in Bulgaria.There are several advantages of SFM compared to other protein feeds, such as comparatively low price, high content of sulfur-containing amino acids methionine, cystine, and cysteine, and low content of anti-nutritional factors.However, its use in ruminant's diets is usually limited because of its high rumen degradability (Bautista et al., 1990).According to Mondal et al. (2008) rumen CP degradability of SFM at 0.06/h outflow rate was 56%, while Chrencova et al. (2010), Diaz-RoyoNr et al. (2016) and Nedelkov (2019) reported degradability ranging from 70% to 85%.