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).
The estrous cycle is divided into two periods, estrus and diestrus with estrus being the time when the mare is in heat, usually for 3 to 7 days. During diestrus, typically 14 to 18 days, the mare is unreceptive to a stallion. Ovulation occurs one to two days before the end of estrus.