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Which are the stages of cat’s pregnancy

Posted on March 14, 2010March 13, 2010 by News Health

Cat Pregnancy: Development of the Embryo

The entire development of the embryo is a fascinating study with scientific names for each stage, but for brevity and better understanding, we’ll concentrate here on the basics.

After fertilization, the zygote (formed by the uniting of the sperm and the ovum) begins to form a somewhat ball-shaped mass of cells, known as the cell mass. Once the cell mass passes 16 cells, it is called the morula. The morula enters the uterus and plants itself in the uterine wall by secreting an enzyme which dissolves a pocket of tissue in the lining of the uterus to form a “cradle” for the morula. In the cat, the egg reaches the uterus in five days and implantation occurs approximately two weeks after fertilization. Also, since the cat is multiparous (bearing more than one offspring during pregnancy), this process will be repeated simultaneously by multiple zygote-morulas, possibly from matings with different male cats, or toms. Not all embryos will survive implantation – this is truly a case of “survival of the fittest.”

The embryo continues to develop, with the more highly evolved cells of the cranium and thoracic regions developing early. The embryo floats within a fluid filled cradle of two sacs, the amnion, and the allantois. Amniotic fluid contains water, protein, sugar, salts, fat, and traces of urea. The allantoic fluid, is filled mainly with excretory products from the fetus.

The placenta, the source of attachment between the maternal and fetal bloodstreams, develops later. The placenta is the “highway” over which oxygen, nutrients, and fetal waste interchange

Finally, when all the organic structures have been formed, the embryo becomes the fetus, and the first trimester is completed. From now until birth, the major activities will be development (the second trimester) and growth (the third trimester).

Care of the Cat During Pregnancy

If you are fostering a cat or have welcomed a stray pregnant queen into your home, you’ll need to have a veterinary “well-check.” It is important in the case of a stray, to have her tested for FeLV and FIV and to discuss the pros and cons of vaccination.

Assuming you have a healthy queen, the best care you can give her is a diet high in nutrients, along with plenty of fresh, clean water. During the final 20 or so days, she should be switched to a premium quality kitten food, and continued on it until after the kittens have been weaned. Feed small, frequent meals. Her abdomen is full of kittens, and she won’t be able to eat much at any one time. She should also be kept indoors at all times.

Impending Birth of Kittens

As your queen nears her time for giving birth, she will exhibit a few signs that will give you clues to the impending arrival of kittens. The first stage of labor lasts from 12 to 24 hours, and may include the following “symptoms:”

  • Nesting
    She may start snooping around in closets and secluded areas for an appropriate place to bear her kittens. The time is ripe for you to prepare an area for her in a private place, with a box or basket lined with soft towels. She may decide instead to give birth on the cold, hard floor of your bathroom, but at least you have tried to accommodate her needs.
  • Increased affection
    She may suddenly become very loving, and want to be near you at all times. Don’t be surprised though, if a previously affectionate cat becomes withdrawn and seeks solitude. Either personality change may be completely normal.
  • Decreased Activity.
    Queenie may decide she’d rather sleep most of the time. She may also lose interest in food.
  • Milk Discharge from Nipples
    Your cat’s nipples will have become enlarged and pink about the third week of pregnancy; 24 hours or so before birth, she may show a milky discharge. This discharge may come even earlier in cats that have given birth several times.
  • Drop in Temperature. The normal temperature in cats is between 100.4°F and 102.5° F. A dramatic drop in her rectal temperature is a sure indicator that birth is imminent.

source:   http://cats.about.com/od/reproduction/a/catpregstages.htm

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