Patent No. 596234 Disclosed is a method for improving or supporting egg quality and/or productive egg laying life span, preventing deterioration in egg shell integrity, enhancing egg-laying performance, egg quality and colour, egg white and yolk texture, nutritional value and/or odour, and/or increasing polyphenol content in an egg in a bird, the method comprising administering to the bird black currants or a composition comprising one or more of processed whole blackcurrants, processed whole boysenberries, one or more natural component extracted from blackcurrants, and/or one or more natural component extracted from boysenberries.
