I think the only role genetics play in a persons intelligence is simply the ability, or enhanced ability, to absorb and retain information.
If one is going to suggest that a race was bred for physical brawn rather than intelligence, what criteria was used to assess intelligence? How is it that a person with greater physical features is somehow less intelligent than a person with lesser physical features? Does this also mean that another race was bred for intelligence?

Intelligence is gained by a broad collection of retained information and to a finer point, the ability to [i]recall[i] said information at any given time.