In a sample of Friesian cattle it was investigated whether an association existed between sexes in pairs of adjacent births. A significant positive correlation was found, increasing as the number of inseminations between births increased. However when the sex combinations were considered the sequence Female-Female showed the lowest mean number of inseminations while the sequence Male-Male showed the higest.

P. Astolfi

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XVI. Poultry, fish and horse genetics and breeding, growth and reproduction, immune response and disease resistance., , 501–504, 1990
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