Department of Animal Improvement and Nutrogenomics, Institute of Genetics and Animal Breeding Jastrzębiec, Magdalenka, Poland;2. Department of Animal Nutrition, Poznań University of Life Sciences, Poznań, Poland;3. Department of Animal Improvement and Nutrogenomics, Institute of Genetics and Animal Breeding Jastrzębiec, Magdalenka, Poland;4. Department of Dairy Science, National Research Centre, Giza, Egypt;5. Department of Biochemistry, Institute of Soil Science and Plant Cultivation, State Research Institute, Puławy, Poland