Researchers from the Pontifical Catholic University of Minas Gerais found that mares older than 15 were more likely to deliver fillies than younger mares, reports EQUUS magazine.
The researchers reviewed breeding records of almost 60,000 Mangalarga Marchador horses born between 1990 and 2011.
They then compared the sex ratio of offspring to the age of both the sire and dam; they also compared the age gap between both. The team also analyzed breeding records of 253 other horses foaled between 1989 and 2010.
All analyzed data showed that mares older than 15 were more likely to have fillies than their younger counterparts. Age of the stallion had only a minor effect on the sex of the foal.
Read more at EQUUS magazine.
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