In the improvement process of local yellow cattle with frozen semen of beef cattle, the cows were grouped according to different cross combinations. Then, the conception rate, dystocia rate and reproductive survival r...In the improvement process of local yellow cattle with frozen semen of beef cattle, the cows were grouped according to different cross combinations. Then, the conception rate, dystocia rate and reproductive survival rate of the cows in each group, as well as the body size and body weight of new-born calves, were ana- lyzed. The results showed that no significant differences were found in conception rate among different groups （P〉0.05）; there was no significant difference in dystocia rate between the A and C groups （P〉0.05）, but the dystocia rate in the B group was significantly different from those in the A and C groups （P〈0.05）. There were positive correlations between calf forehead width, chest circumference and the dys- tocia rate.展开更多
[Objective] The aim was to study the relationship of plant characters with bud living rate and mother stem emergence rate of ratoon rice before harvest. [Method] Eighteen mid-season hybrid rice cultivators approved re...[Objective] The aim was to study the relationship of plant characters with bud living rate and mother stem emergence rate of ratoon rice before harvest. [Method] Eighteen mid-season hybrid rice cultivators approved recently were taken as materials and relationship of plant characters including bud living rate and moth- er stem emergence rate of ratoon rice before harvest was explored, based on relat- ed data. [Result] The shorter rice with lower harvesting index is the main character of high emergence rate for first cropping rice; decline of plant height and increase of ear-bearing percentage would improve emergence of regenerative seedlings. [Conclusion] The research provided scientific reference for breeding of rice cultivars with high regenerative capacity.展开更多
文摘In the improvement process of local yellow cattle with frozen semen of beef cattle, the cows were grouped according to different cross combinations. Then, the conception rate, dystocia rate and reproductive survival rate of the cows in each group, as well as the body size and body weight of new-born calves, were ana- lyzed. The results showed that no significant differences were found in conception rate among different groups （P〉0.05）; there was no significant difference in dystocia rate between the A and C groups （P〉0.05）, but the dystocia rate in the B group was significantly different from those in the A and C groups （P〈0.05）. There were positive correlations between calf forehead width, chest circumference and the dys- tocia rate.
基金Supported by Sichuan Financial and Engineering Foundation for the Young(2007QNJJ-020)Sichuan Cultivation Foundation for Academy leaders+3 种基金Sichuan Key Project of Rice BreedingConstruction of Rice Industry System in SouthwestNational Crop-harvesting ProjectSichuan Financial Promotion~~
文摘[Objective] The aim was to study the relationship of plant characters with bud living rate and mother stem emergence rate of ratoon rice before harvest. [Method] Eighteen mid-season hybrid rice cultivators approved recently were taken as materials and relationship of plant characters including bud living rate and moth- er stem emergence rate of ratoon rice before harvest was explored, based on relat- ed data. [Result] The shorter rice with lower harvesting index is the main character of high emergence rate for first cropping rice; decline of plant height and increase of ear-bearing percentage would improve emergence of regenerative seedlings. [Conclusion] The research provided scientific reference for breeding of rice cultivars with high regenerative capacity.
