The absence of a - casein also significantly inhibits transcription of the other casein genes .
a - Casein deficiency severely delays pup growth during lactation
The absence of a - casein also significantly inhibits transcription of the other casein genes .
a - Casein deficiency severely delays pup growth during lactation and results in a life - long body size reduction compared to control animals , but has only transient effects on physical and behavioural development of the pups .