Dogs give birth to litters, meaning multiple puppies. They first come into heat and then must have sex in order to become pregnant.
A female dog comes into heat for 18 to 21 days every 6 months. Larger breeds only go into heat once a year. She will be attracted to male dogs approximately 3 to 4 days afterwards. The two dogs become stuck together during the mating process. This is called being tied together. Pregnancy in dogs lasts about 2 months. Labor in dogs is similar to human labor. The dog begins contractions before giving birth. After birth, she removes the umbilical cord.Learn More
Platyhelminthes, also known as flatworms, are hermaphrodites, meaning individuals of the species produce both sperm and eggs. These are released from the platyhelminthes where they become cross-fertilized by other platyhelminthes. Two types of platyhelminthes, trematoda and cestoda, lay eggs constantly. The turbellarian class has a seasonal cycle. Turbellaria also reproduce asexually by dividing. Turbellaria are the only class able to regenerate body parts.Full Answer >
The gestation period for dogs is about 63 days. This time frame is measured from the day of ovulation to the day that the dog gives birth. As with humans, the gestation period is divided into three trimesters.Full Answer >
The standard mare gestation length is from 320 to 362 days after the date of breeding, and on average, most mares will foal, or give birth, 330 to 345 days after a successful breeding. However, it is common for a mare to successfully give birth in a later period than the average range.Full Answer >
The normal nesting season for ducks begins in March. The NSW Department of Primary Industries in Australia say that some ducks are able to lay eggs all year round.Full Answer >