This is important to remember since you can manipulate the uterine environment up until this stage. The egg is fertilized in the fallopian tubes and does not enter the uterus until it about Day 6 of gestation.
Stress, fever, uterine infections, hormone abnormalities and twins can all cause a mare to spontaneously abort. There are many causes of early embryonic loss. Horse embryos are not more fragile than other species it’s primarily that horses in general have poor reproductive performance (ability to maintain a conceptus). Is it to breed performance, show or pleasure horses? To maximize your reproductive dollar you have to decide what the goal of your reproductive program is. Equine reproduction costs money: Feed, electricity, labor, water bills, barns, employees, stud fees, transportation and veterinary bills.
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