**Preface to "Safety and Efficacy of Feed Additives in Animal Production"**

Due to the challenge of reducing the environmental impact of animal production, as well as maintaining animal health and sustainable livestock productivity, it is necessary to change the feeding strategy of livestock. Feed supplementation with safe and efficient nutrient additives should provide optimal animal performance and maximize livestock productivity, as well as reducing environmental pollution from animal production.

This book consists of one review and 14 articles written by research experts in their topic of interest, concerning the use of nutritional feed additives in animal nutrition to improve livestock health and productivity with respect to the environment. Several novel feed supplements that improve nutrient utilization and micronutrient bioavailability in animals, and provide safe and functional foods, were introduced.

> **Lubomira Gresakova and Emilio Sabia** *Editors*
