Italian Renaissance Art. Florence (Quattrocento), Rome and Venice (Cinquecento). A-Z of ART MOVEMENTS. The Dome of Florence Cathedral, designed by Filippo Brunelleschi. (1377-1446), was a public symbol. of Florentine superiority during. the early Italian Renaissance.
How to Tell when a Cow or Heifer is in Estrus. Estrus is defined as the period where a female (in this case, a cow or heifer) is receptive to a male (or, the bull). Estrous, on the other hand, is the whole reproductive heat cycle that a female goes through, from heat period to no heat period (Proestrus, Estrus, Metestrus, and Diestrus).
Estrus (heat) is the mating period of female animals. When estrus occurs, animals are said to be in heat or in season.. Cats normally have their first estrous cycle between 5 and 10 months of age, with the average age around 6 months. The female cat has 2-4 estrous periods every year, each lasting 15-22 days. If she is bred, estrus seldom lasts more than 4 days.