[Objective]The paper was to improve the quality and growth rate of native yellow cattle in Wenzhou.[Method]Three groups of cattle were subjected to artificial insemination using frozen semen from Wagyu bull.The groups...[Objective]The paper was to improve the quality and growth rate of native yellow cattle in Wenzhou.[Method]Three groups of cattle were subjected to artificial insemination using frozen semen from Wagyu bull.The groups consisted of 20 native yellow cattle,20 Angus catle,and 20 Luxi yellow cattle.The heifers were subsequently evaluated for body size and body weight,and underwent treatment with estrus synchronization,artificial insemination,and early pregnancy diagnosis.[Result]The mean body size and body weight of native yellow cattle were found to be significantly lower than those of Angus cattle and Luxi yellow cattle(P<0.05).The estrus synchronization rate and mating rate of native yellow cattle were both 100%,while the corresponding rates for Angus cattle and Luxi yellow cattle were 90%and 95%,respectively.The ultrasound examination conducted on the 32m day following the mating revealed a distinct image of gestation sac,which,when considered alongside the findings of the rectal examination,may be indicative of pregnancy.The conception rates were 75%,72%,and 74%for native yllow cattle,Angus cattle,and Luxi yellow cattle,respectively.[Conclusion]The reproductive performance of native beef cattle is relatively superior.展开更多
以剑南春中温大曲为材料,通过平板和产酶能力的筛选,分离得到1株产脲酶性能稳定的JNC-U5菌株,该菌经形态、生理生化及18S r DNA测序鉴定定性为聚多曲霉。该菌产脲酶活力可达到69.3 U/g,其酶活在pH3.5~4.5环境下仍保持较高活性,应用于酿...以剑南春中温大曲为材料,通过平板和产酶能力的筛选,分离得到1株产脲酶性能稳定的JNC-U5菌株,该菌经形态、生理生化及18S r DNA测序鉴定定性为聚多曲霉。该菌产脲酶活力可达到69.3 U/g,其酶活在pH3.5~4.5环境下仍保持较高活性,应用于酿酒生产可大幅降低EC含量,确保白酒的食品安全性。展开更多
基金Supported by Wenzhou Science and Technology Commissioner Special Project(X2023070)Science and Technology Program Project of Taishun County(2023TSXM0028)Heilongjiang Provincial Natural Science Foundation-Jointly Guided Project(LH2022C092).
文摘[Objective]The paper was to improve the quality and growth rate of native yellow cattle in Wenzhou.[Method]Three groups of cattle were subjected to artificial insemination using frozen semen from Wagyu bull.The groups consisted of 20 native yellow cattle,20 Angus catle,and 20 Luxi yellow cattle.The heifers were subsequently evaluated for body size and body weight,and underwent treatment with estrus synchronization,artificial insemination,and early pregnancy diagnosis.[Result]The mean body size and body weight of native yellow cattle were found to be significantly lower than those of Angus cattle and Luxi yellow cattle(P<0.05).The estrus synchronization rate and mating rate of native yellow cattle were both 100%,while the corresponding rates for Angus cattle and Luxi yellow cattle were 90%and 95%,respectively.The ultrasound examination conducted on the 32m day following the mating revealed a distinct image of gestation sac,which,when considered alongside the findings of the rectal examination,may be indicative of pregnancy.The conception rates were 75%,72%,and 74%for native yllow cattle,Angus cattle,and Luxi yellow cattle,respectively.[Conclusion]The reproductive performance of native beef cattle is relatively superior.
文摘以剑南春中温大曲为材料,通过平板和产酶能力的筛选,分离得到1株产脲酶性能稳定的JNC-U5菌株,该菌经形态、生理生化及18S r DNA测序鉴定定性为聚多曲霉。该菌产脲酶活力可达到69.3 U/g,其酶活在pH3.5~4.5环境下仍保持较高活性,应用于酿酒生产可大幅降低EC含量,确保白酒的食品安全性。
