Sunflower meal is entirely adequate as the sole source of supplemental protein in dairy rations. Owing to the relatively high protein degradability of sunflower meal, dietary inclusion levels are limited in dairy cattle diets (Erasmus et al., 1988). Treating proteins have been used to reduce their degradation in the rumen, formaldehyde that combined with proteins and sodium hydroxide denatures protein (Cozzi et al., 1995). The objective of this study was to determine the influence of high fat sunflower meal (containing 165 g fat /kg DM) as untreated or treated with formaldehyde or NaOH on dry matter intake (DMI) and milk yield and composition.

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