A TSH test measures the amount of thyroid stimulating hormone (TSH) in your blood. TSH is produced by the pituitary gland and tells the thyroid gland to make and release the hormones thyroxine (T4) and triiodothyronine (T3). See also: 1  T3 test.  T4 test.
Best Answer: Female cats typically have their first heat around the age of six months, which usually lasts for 5 to 7 days. Cat's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year. I advise unless you want kittens to keep her in at these times.
Summation. 1  Heat, oestrus, and estrus all refer to heat cycles in cats. 2  The breeding season in cats lasts almost year-round. 3  Heat cycles can start as early as four or five months in a female kitten. 4  Heat cycles in cats last from several days to two weeks or more.