The Protective Efficacy of Attenuated Salmonella gallinarum Strain 97A
减毒鸡沙门菌疫苗株97A的免疫保护效力试验
Zhen-Yu 29A was developed by using IR 29 as male parent and Zhen-Shan 97A ( B ) as recurrent patent .
珍育29不育系是以IR29作改良亲本，珍汕97A（B）作为轮回亲本回文选育的。
97a