Oxidative Stability of Milk Influenced by Fatty Acids, Antioxidants, and Copper Derived from Feed

Decay of riboflavin (fluorescence response to excitation at 445nm and emission at 520nm) as a function of the time of exposure to fluorescent light (2,000 lx) at 4°C. Mean±SD of samples from the 3 periods; milk from cows fed grass-clover silage (■), and from those fed hay (♦).

Accumulation of dityrosine as a function of the time of exposure to fluorescent light (2,000 lx) at 4°C. Mean±SD of samples from the 3 periods; milk from cows fed grass-clover silage (■), and from those fed hay (♦).

Accumulation of lipid hydroperoxides (UV absorbance) as a function of the time of exposure to fluorescent light (2,000 lx) at 4°C. Mean±SD of samples from the 3 periods; milk from cows fed grass-clover silage (■), and from those fed hay (♦).

Accumulation of hexanal as a function of the time of exposure to fluorescent light (2,000 lx) at 4°C. Mean±SD of samples from the 3 periods; milk from cows fed grass-clover silage (■), and from those fed hay (♦).

Degradation of α-tocopherol as a function of the time of exposure to fluorescent light (2,000 lx) at 4°C. Mean±SD of samples from the 3 periods; milk from cows fed grass-clover silage (■), and from those fed hay (♦).