| Breeding of high-quality beef cattle is a long-term process. Its selection method has gone through single item selection method, independent elimination method, and gradually developed into index method selection technology. The selection technique of early index method for Taihang beef cattle breeding core group cows refers to the comprehensive breeding index analysis technique, combined with the beef cattle production process, to collect relevant information such as body shape, appearance, growth and development, reproductive ability, adaptability, and lactation ability as early as possible, and give weights of 0.1, 0.3, 0.3, 0.15, and 0.15 respectively for calculation and analysis. The early selection index is formed at the age of 3. Then, the reserve cow individuals are sorted according to the size of the index value, and the fittest are eliminated to form a breeding core group. In the collection and analysis of target trait information, we strive to be comprehensive and systematic, including variety characteristics and appearance evaluation; Birth weight and daily weight gain; Limb and hoof robustness, disease resistance, and tolerance to roughness; Age at onset of labor, mating index, fertility, and postpartum estrus; Breast morphology and weaning weight of calves. This technology is still in trial use, and the rationality, timeliness, and feasibility of its index construction need to be jointly explored by the industry to improve measures, optimize plans, and quickly enhance the reliability and accuracy of early selection of breeding core group cows. |