1 Cats: Cats normally have their first estrous cycle between 4 and 6 months of age, with the average age around 5 months. 2  The female cat has 2-4 estrous periods every year, each lasting 15-22 days. 3  If she is bred, estrus seldom lasts more than 4 days.
Lactate dehydrogenase (LD or LDH) is an enzyme involved in energy production that is found in almost all of the body's cells, with the highest levels found in the cells of the heart, liver, muscles, kidneys, lungs, and in blood cells; bacteria also produce LD.actate dehydrogenase (LD or LDH) is an enzyme involved in energy production that is found in almost all of the body's cells, with the highest levels found in the cells of the heart, liver, muscles, kidneys, lungs, and in blood cells; bacteria also produce LD.
lactate dehydrogenase ldh is an enzyme that helps facilitate the process of turning sugar into energy for your cells to use ldh is present in many kinds of organs and tissues throughout the body including the liver heart pancreas kidneys skeletal muscles brain and blood cellswhen illness or injury damages your cells ldh may be released into the bloodstream causing the level of ldh in your blood to risehere are five different forms of ldh and they are distinguished by slight differences in their structure each form of the ldh enzyme is called an isoenzyme the isoenzymes of ldh are ldh 1 ldh 2 ldh 3 ldh 4 and ldh 5