No, when a mammal is pregnant it will not go into heat while it is pregnant.
No. Sows often will mate with more than one male during her heat period.
Are you asking why do sows go into heat easier than cows, or something else entirely? It is not entirely certain what you mean by "easily" or possibly "easier" unless an explanation can be had to better understand this question.
Sows have offspring. Pure and simple.
Every 6 months.
Boars can often reach over 600 lbs, sows over 400 lbs.
Sows come into heat every 21 days, and are in heat for 4 to 6 days (approximately). If bred, their gestation is 115 days, give or take a few days depending on the breed. Landrace tend to be a bit longer, maybe 116 to 118 days, while York are right around 115 days.
For female animals, they go in heat about every 6 months.
When the boxers are on heat, they usually mate just like the cats.
Dogs usually go into heat twice a year, although some individual dogs will go into heat more or less often. Typically, a female will remain in heat for about three weeks, although she will only bleed for the week to a week and a half.
most female goes go into heat every 7-8 months
A "Sow" is a mature, breading female pig. "Sows" is the plural form of the word.