The dog's pregnancy is very difficult to determine in the early stages, since the obvious signs appear fairly late.
At the same time, neither the appearance of the animal nor the pretty of the abdominal cavity of the pet at first can not shed light on whether he lays off the offspring.
In the event of a normal course of pregnancy, it can be diagnosed on time from three weeks with tacking.
When one month passes from the beginning of the dog's pregnancy, due to the nipping of the fetus, its body acquires the following features:
Development of the embryo and the fetal shells. Zygota, moving around the egg in the uterus, quickly crushing. At first, two blastomer is formed, then four, eight, etc. The accumulation of blastomeres without a separate cavity is called Morula. The zygota in the stage of Morula goes to the cat's uterus for 5-8 days after fertilization. An embryonic nodule is formed - the embryoblast, and the outer layer of its cells is a trophoblast (feeding sheet). There is a liquid and cavity between them, and the Morula turns into an embryonic bubble - blastocyte.
Attaching the embryo to the mucous membrane of the uterus - the indation occurs in dogs from 14 to 21 days. In the future, the body of the fetus is formed from the embryoblast, and from the trophoblast - an aqueous shell and a placenta. These are temporary (provider) fetal organs. At 7, after 4 weeks after fertilization, the germin is surrounded by quite developed fruit shells: water, blade and vascular.
Water shell (amnion) is the inner shell without blood vessels. A bubble in which the fetus is surrounded by an oily fluid that grips with the fruit in the navel area. In the carnivore amnion, around all sides is surrounded by an inner leaf of the blade. The water shell epithelium produces amniotic colorless liquid - 8-30ml. The liquid contains protein, sugar, fat, estrogenic hormones, mineral salts and other substances. Ingestion of the oily fluid fluid supports water exchange, ensures the development of the gastrointestinal tract. The aqueous bubble also performs a buffer function, softens and prevents mechanical effects on the fruit, and during childbirth facilitates its elimination.
The urinary shell (allantois) begins on the top of the urinary bubble of the embryo and comes through the urinary duct (lorahus), which is part of the umbilical cord. Furiously expanding, the urerahow forms the cavity of the urinary shell, in which the germ urine accumulates.
The dog's urinary casing is located between the water and vascular shells, fucked with them, forms Allanto - Amnion and Alantovanion. By the end of pregnancy, the amount of blade liquid in dogs 10-15 ml. The role of Allanta as a water shell.
Vascular shell (chorion) and placenta. The vascular shell is the most outdoor, the surrounding fruit on all sides. On its outer surface there are veils consisting of a connective tissue coated with a layer of epithelial cells. Villages are introduced into the deepening of the mucous membrane of the uterus (crypts).
Placenta - a complex of fabric formations on the vessel of the fetus and the mucous membrane of the uterus, through which the fetus communication with the mother's organism and the metabolism between them occurs.
Dogs Chorion has an oblong shape, resembling a large cucumber. Chorion Vilony come into direct contact with the endothelium of the uterine capillaries, as a result of this placenta of carnivorous belonging to the type of endothelio - chorial. During the birth, the separation of the fetal placenta in dogs is accompanied by partial rejection of the motherboard of the placenta, which leads to small bleeding.
In the placenta dogs accumulates a significant amount of biliveridine (green pigment), which, when separating the last, is released and green is released.
Pupovina in puppies contains two artery and veins. Underground length on average from 6 to 10 cm.
Fetal development. At three weeks - Length 1cm, all organs are laid. Abdominal cavity is closed. Certified outlines are decorated. Four weeks - 4 cm, species features expressed quite clearly. Six weeks - length 6-10 cm, individual hairs on the skin are noticeable. Nine weeks - a mature fruit of 8-20 cm, the weight of 100-150 g., The hair cover is short, covers the whole body, the eyelids are closed, the bones of the skull did not grow up, there is no teeth.
changes in the body of the mother during pregnancy. In the ovaries, so many yellow bodies develop, how many ripened and ovulated the follicles of egg cells. The uterus develops hard, muscle fibers are lengthened at 7-12 times and thicken at 3-5 times. Arteries and veins are expanding 4-5 times and lengthened, new vascular branches appear. In the cervix, a plug of thickened mucus that prevents the penetration of infection is formed. The walls of the uterus form an extended section (ampoules) of a rounded shape around each fetus, then as the fruits increase, they acquire an oval shape, and at the end of pregnancy the boundaries between them are gradually smoothed.
Pregnancy in dogs - joy for the owner, especially when the continuation of the offspring of his pet was planned. Pet is a fairly responsible decision, so the owner of the female must be ready, both to external and behavioral changes. The owner should be familiar with all the important points in advance, which will help him quickly navigate and show maximum attention to a pregnant pet.
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Birth is an article from the "Big Medical Encyclopedia".
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