Adaptability Evaluation and Utilization of South Devon Cattle in Qinghai;

The Primary Report on the Improving Effects of South Devon on Qinghai Yellow Cattle;

Study on Breeding Performances of South Devon Cattle;

Based on the traits of small body, low meat yield and economic efficiency of Laizhou cattle, South Devon cattle were introduced to crossbreed with Leizhou cattle.

In order to determine the crossbreeding effects of South Devon beef cattle on jiaxian Red Cattle,the body sizes and body weight of male and female F_1 crossbreds of Jiaxian Red cattle at 0,6,and 12 month of age were measured and compared with the corresponding traits of Jiaxian Red cattle.

Measurement on Crossbreeding Results of South Devon Beef;

Polymorphisms of DGAT2 gene and its associations with several growth traits in Nanyang cattle;

Designing of Nanyang Cattle Breeding Data Base System;

Studies on the IVM and IVF of Small Antral Follicular Oocytes in Nanyang Cattle;

Four growth curve models including Brody, Von Bertallanffy, Gompertz and Logistic founctions were used to analyze the body weight of female Nanyang cattle.

In order to produce bezoar rapidly and improve output, the plastic web for special purpose, bacteria culture and so on were planted into the gall-bladder of Nanyang cattle by surgical operation, which had no effect on the growth, reproduction, field work, plumpness and health of the Nanyang cattle .