The quality of the raw materials, the quality of the oil used, the shelf life of the feed, the existing pollution and the feed manufacturing equipment are all effective in the final quality of the feed. The presence of mycotoxins, oxidative compounds, bacterial toxins and indigestible, smelly and tasteless food in the feed can ultimately affect the performance of the herd. Lack of proper weighing, increase in losses, weakening of the immune system and increase in conversion rate are among the damages of low quality of feed.