Study Sheds Doubt on Marbles' Effect on Mare Heat Cycles

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Many people have offered solutions to overcome the problems of inconsistent performance while mares are in heat. One method popular with owners today is the implantation of marbles as glass intrauterine devices (IUDs).

"The original paper that described this technique suggested that the marble might behave like an early pregnancy and delay the mare’s return to heat," explained Caroline M

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