2) First Day Entire Cover
首日实寄封
3) bow seal
首部密封
4) bow transom plate
船首封板
5) First Flight Cover (F.F.C.)
首航封
6) the date of initial immunity
首免日龄
1.
To determine the date of initial immunity for the piglet with pseudorabies virus colostral antibodies,25 piglets were obtained from three sows that had been inoculated intramuscularly before mating and 2 weeks before farrowing with PRV gE/gI/TK-deleted vaccine SA215.
在研究猪伪狂犬病基因缺失活疫苗 (SA 2 15 )免疫接种母猪所产仔猪母源抗体消长规律 ,并绘制其消长曲线的基础上 ,确定了仔猪首免日龄。
补充资料：首日封
| 首日封 first-day cover 贴用首日发行的邮票，并盖有当日邮戳的信封。 |
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条