1. Jilin Provincial Key Laboratory of Grassland Farming Northeast Institute of Geography and Agroecology Chinese Academy of Sciences Changchun Jilin 130102 China
2. College of Life and Engineering Shenyang Institute of Technology Fushun Liaoning 113122 China
3. College of Animal Science Southwest University Chongqing 402460 China
4. Grassland Research Centre AgResearch Limited Private Bag 11008 Palmerston North 4442 New Zealand
5. Faculty of Veterinary and Agricultural Sciences The University of Melbourne Dookie Campus Victoria 3647 Australia
6. Key Laboratory of Combining Farming and Animal Husbandry Ministry of Agriculture and Rural Affairs Institute of Animal Husbandry of Heilongjiang Academy of Agricultural Sciences Hrbin 150086 China