Authors
Jivko Nakev
Agricultural Institute – Shumen, Bulgaria
Teodora Popova
Institute of Animal Science- Kostinbrod, Bulgaria
Maya Ignatova
Institute of Animal Science- Kostinbrod, Bulgaria
© 2020 Nadezhda Palova, Jivko Nakev, Teodora Popova, Maya Ignatova, published by National Institute for Research-Development in Biology and Animal Nutrition
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.