Abstract: Luxi cattle are one of excellent region breeds in China. In order to more effectively develop appropriate breeding program and speed up breeding beef line of Luxi cattle, open nucleus and close nucleus were set respective on the basis of the nucleus breeding scheme and young bull system. And deterministic simulation was used to evaluate these two schemes for breeding efficiency. The results showed that the program of open and close nucleus breeding program compared to a comprehensive genetic gain increased 0.80%;breeding profit increased 9.39%;breeding efficiency increased 10.64%;generation interval extended 0.90%. According to the results, breeding efficiency of open nucleus breeding system super to closed breeding system on the basis nucleus scheme for beef line of Luxi cattle.

Key words: open nucleus; closed nucleus; Luxi cattle; breeding gain