1. ETH Zurich, Institute of Agricultural Sciences, Zurich 8092, Switzerland.
2. Institute of Behavioural Physiology, Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf 18196, Germany.
3. Institute of Muscle Biology and Growth, Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf 18196, Germany.
4. Institute of Reproductive Biology, Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf 18196, Germany.
5. Institute of Genetics and Biometry, Leibniz Institute for Farm Animal Biology (FBN), Dummerstorf 18196, Germany.