| Abstract: In order to investigate the growth rate of different crossbreeding combinations of beef cattle in Dehong hot zone during lactation period, we introduced Black Angus cows as the maternal basis in 2021 from Australia, crossbreeding Dulong cattle, Wenshan cattle, Short-horn, Yunling cattle, Wagyu cattle and Angus. Then, F1 offsprings of 314 calves from six crossbreeding combinations were arranged and carefully fed at 6 months of age for weaning and weighing. The results showed that the average weaning weight and growth rate of the six crossbreeding combinations were different. Among them, the weaning weight of Dulong cross Angus F1 was 127.27±18.83 kg, and the average daily gain (ADG) was 0.69±0.10 kg, while the counterparts of Wenshan cattle cross Angus F1 were 146.69±25.40 kg and 0.79±0.14 kg, Short-horn cross Angus F1 were 171.98±22.34 kg and 0.93±0.12 kg, Yunling cattle cross Angus F1 were 160.54±26.62 kg and 0.87±0.12 kg, Wagyu cross Angus F1 were 158.44±26.62kg and 0.86±0.14 kg, lastly Angus were 162.91±25.10 kg and 0.88±0.14 kg, respectively. The weaning weight of F1 calves introduced by the different crossbreeding combinations in Dehong hot district was studied and compared, and the growth rate of F1 calves was analyzed, providing an important scientific basis for crossbreeding Yangrui cattle. |