1. Institute of Nutritional Physiology, Dummerstorf, Germany
2. Institute of Reproductive Biology, Dummerstorf, Germany
3. Institute of Genetics and Biometry, Dummerstorf, Germany
4. Institute of Muscle Biology and Growth, Dummerstorf, Germany
5. Institute of Behavioral Physiology, Leibniz Institute for Farm Animal Biology, Dummerstorf, Germany