Time flies, time flies, and the three-year doctoral life will be over in a blink of an eye. In retrospect, I have many ideas. Twenty years of studying hard at a cold window has brought me both the joy of success and the frustration of failure, and there are too many people and things worth remembering. First of all, I sincerely thank my mentor, researcher Xu, for his sincere education and careful care. In my learning process, from the topic selection, experimental design and implementation, to the writing and revision of the paper, every link embodies the sweat and hard work of the teacher. My teacher's international vision, cutting-edge and quintessential academic attainments, rigorous and diligent academic style, and calm, optimistic and open-minded lifestyle not only let me know how to look at things and plan my life, but also let me know a lot about how to deal with people and how to deal with them, which deeply influenced my future work and life. My teacher and Jenny have given me meticulous care and help in my life. I want to take this opportunity to express my most sincere thanks to them!
I want to thank my brother Li Junya, a researcher. After he came back from Cornell University, it was the middle of my experiment, and many problems were solved under his specific guidance. His superb mathematical statistics and genetic theory, broad scientific research vision and generous personality set a benchmark for my future life!
This experiment was completed in the laboratory of cattle genetics and breeding of Beijing Institute of Animal Husbandry and Veterinary Medicine, Chinese Academy of Agricultural Sciences. In the process of sample collection and experiment implementation, teachers Chen Jinbao, Gao Xue and Ren Hongyan supported and helped them. I would like to express my sincere thanks!
Thank you very much for your guidance and help in the process of topic selection and experimental design! Special thanks to Professor xxx for his guidance on my study at school and his concern for my life.
On the occasion of graduation, I am very grateful to Dr. Rong Min, Hou Guanyu, Deng Guixin, Zhou Zhengkui, Yuan and Master He Jianning, Du Xinhua in the laboratory for their help! Thanks to the graduated doctoral students, Wang Xingping, Ji, Huai Yahong, Li Hengde, and the graduated graduate students Ma Tenghe, Guo Yanqing, Qin, Tian Lu and Wu Huiguang for their selfless help in the experiment and thesis writing. Thank you, brother Zhang Xiaohui, for your great help in the process of experiment and paper arrangement! Special thanks to my two comrades-in-arms, Zhang Lupei and Dr. Gan Ganfu, for their support and help in study, experiment and spirit. I thank the lab teachers Jiang Xiaojuan and Dr. Shi Mingyan for their help in the experiment. Here, I would like to express my sincere thanks to them and all the teachers and classmates who have helped me!
Thank my classmates xxxx, teacher xxx of Shaanxi Agricultural University, Dr. xxx of China Agricultural University, Mr. Du of Peking University Academy of Life Sciences, researcher Du Lixin, researcher, teacher, Dr. Qiao and Dr. Yin Chunguang for their selfless help in the experiment!
As I am about to finish my studies, I thank my family for their understanding and support over the years. Because my learning style bent my parents' waist, drained their sweat and broke their hearts. My sensible brother shouldered the family business from an early age and supported my reading style without any regrets. Thank my cousin and brother-in-law for their support and encouragement to my studies! Thank my father-in-law and family for their care and concern! Thank my wife Yang Yumei for her understanding and support of my studies. For the sake of my studies, she gave up her excellent job. It was her selfless dedication that gave me the confidence and perseverance to finish my studies. Without them, I can't imagine how I will spend this challenging study career. I sincerely wish my loved ones health and happiness!
Finally, I would like to express my high respect to the experimental animals that have made important contributions in this experiment!
I dedicate this paper to all my relatives, teachers, classmates and friends who care, help, support and encourage me!