商品群

还提出了杂交情况下核心群与商品群遗传时距的计算方法。

A procedure for calculating the genetic lag between nucleus and commercial herds in crossbreeding system is also proposed .

为杜绝垂直传播，要定期监测从原种群到商品群的整条扩繁链。

The chain of multiplication from elite stock to commercial pullets is regularly monitored to ensure freedom from vertically transmitted SE infection .

国内的连锁超市要想发展，应该从培育核心竞争力、降低成本、选择合适的物流管理模式和推出合理的商品群结构等方面作出努力。

If domestic chain supermarkets want to develop , they should make progress in terms of cultivating core competence , cutting down the cost , choosing the appropriate logistics management pattern and promoting the reasonable commodity clusters structure .

接种MD三价疫苗的4个品系的商品鸡群，抗RB1B超强毒株攻毒的平均保护效力为94.60%；在模拟MD强毒自然传染的试验中，MD三价疫苗的保护效力达到95.65%。

The mean protection of trivalent vaccine was94.60 % in four commercial chicken strains against RB1B challenge , and was95.65 % in the MDV natural infection model experiment .

商品蛋鸡群马立克氏病与细菌性混合感染的诊断

A diagnosis of Marek 's disease co-infected with bacteria in commercial layer flock

商品代肉鸡群中禽网状内皮组织增生病病毒和马立克氏病病毒的混合感染

Coinfection of reticuloendotheliosis virus and marek 's disease virus in broiler flock