Apogee k9 offers progesterone testing. If you are interested in knowing the optimum breeding time, then a progesterone test is what you need.

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A progesterone test can help show whether low progesterone levels are causing female infertility (problems getting pregnant after a year of trying) or problems during pregnancy. The test may also help diagnose certain problems with the adrenal glands that may cause high levels of progesterone in both females and males.