White heifer disease in a herd of dairy shorthorns
The incidence of white heifer disease in a herd of Shorthorns is described. The disease is far commoner in white animals and somewhat commoner in roan than in red. White animals that were daughters of white seem to be more susceptible than white that are the daughters of roan. From the comparison of the frequency of the gener in registered heifer calves with that in their parents, it was concluded that up to registration there was selection againstr. This could be accounted for by the inviability or lack of registration of white calves apparent from the deficiency of whites in the offspring of roan by roan matings. After registration, roan animals are favoured by breeders. For this latter preference, no basis could be found either in milk production or longevity.
Volume 100, 2021
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