- A heat period lasts about 4 to 7 days, if the girl is mated and a bit longer if don't.
- After successful mating the sperm swim through the cervix.
- Coverings shouldn't lasts too long, because of different development stages of embryo.
- Boy and the girl can be separated for 48 hours after some successful coverings happened in the first days. Matings in a short period of time (each N minutes) increase the concentration of Luteinizing Hormone (LH). LH aids in egg maturation and is needed to trigger ovulation and the release of eggs from the ovary.
- Ovulation, the release of a mature egg from its developing follicle in the outer. The act of mating stimulates and induces ovulation. Ovulation takes place about 24-36 hours after covering.
- Spermatozoa had already reached the Fallopian tube.
- Fertilization occurs in the oviducts.
- Fertilized eggs pass into a uterine horn.
- While migrating the eggs will grow into a blastocysts.
- Developing embryo, moving as a blastocyst through a uterus, makes contact with the uterine wall.
- Blastocysts develops into an embryos.
- It will take 2 weeks to develop the major organs and the skin is forming.
- The placenta starts to form. Begin of the spinal cord development.
- The circulatory system is starting to develop.
- Is possible to distinguish the head and the tail.
- Boy embryos produce testosterone. Because of this if a the girl is placed between two boys, she can be more aggressive than other the girls.
- The embryo size is about 1 cm.
- The digestive tract has developed.
- The mouth and cerebellum are forming.
- Can be distinguished the placement of the eyes and ears.
- The forelegs begin to develop.
- The embryo size now is about 2 cm.
- The hind legs begins to develop.
- The cerebrum and brainstem are in place.
- The eyes have color.
- The forelegs have an internal skeleton.
- The circulatory system is now carrying blood.
- The hearts are the size of a pinhead.
- The internal organs are formed.
- The spinal cord reaches into the tail.
- 3 weeks of pregnancy. From now can be seen signs of pregnancy, pink and enlarged nipples and thinner fur around them.
- Due to hormonal changes, nausea with vomiting might occur. Feeding several small meals a day might help.
- The skeleton is made of cartilage. Can be noticed ear-holes, palate and tongue are formed.
- The nervous system, spinal cord and brain develop a little bit more.
- The embryos now are complete and become known as fetuses.
- Skeletons are formed of 247 bones and begin to calcify.
- Fetuses are now 4 cm by 2 cm.
- Heads develop a chin, mouth, nose, cheeks and teeth.
- An experienced breeder or veterinarian can count the pea-sized fetuses.
- The mother should be fed a foods kittens for appropriate development of fetuses.
- Nerves and muscles are developing. Kittens are already kicking their siblings. They do not yet have fur, but already have claws and the iris is formed in the eye.
- The queen is now noticeably bigger.
- The uterus fills with liquid and is impossible by palpation to determine the precise number of fetuses.
- Skin becomes thicker, ears bigger and the tail lengthens. Mother now start preparation for feeding kittens.
- Silky fur is developed and body have already pigmentation.
- The queen search a suitable place for labor and is a time to show her to her nesting box.
- Two million hairs have developed in the nose.
- The fetuses practice grooming already, wipes their paws over their mouths.
- Mother now drinks 0.5-1 liter of water per day to replace kittens' amniotic fluids. You can help her with a cat drinking fountain.
- Can be already difficult for the queen to groom herself and you can help her gently cleaning with warm water vulva and nipples.
- You can prepare the queen for kittens feeding and trim the hairs around the nipples for easier access for the kittens.
- On daily basis take a cat's rectal temperature until kittens birth.
- The queen's breasts swell and can already produce milk.
- Cat's behavior changes, she looks nervous and continuously following you.
- 12-24 hours before labor will begin, cat's temperature may drop from 38.5 to 37.5 degrees Celsius and you can prepare for the birth of kittens.
- A discharge is normal as her body counts down to kitten time
- 65 days of pregnancy. Today is estimated due, but labor may take place from the 60th to the 70th day. Kittens born earlier, probably can't survive.
- After kittens birth you may be interested in kittens development calendar