Match the following columns

Column-I (Animals)	Column-II (Heat period)
a. Swine	1. 1 - 3 h
b. Goat	2. 18 - 24 h
c. Cow	3. 24 - 48 h
d. Sheep	4. 1 - 5 days

In species with estrous cycles, females are generally only sexually active during the estrus phase of their cycle. This is also referred to as being "in heat".
a. The heat period of Swine is 1 - 5 days.
b. The heat period of Goat is 1 - 3 h.
c. The heat period of Cow is 18 - 24 h.
d. The heat period of Sheep is 24 - 48 h.