What are the characteristics of ovulation when dogs are in heat- - Pet Encyclopedia

To accurately predict the time of ovulation in dogs, we can only make adjustments and observations, so I can only make a rough inference based on symptoms

If the dog's ovulation time cannot be determined well, then the dog may not be bred at a more appropriate time. This may reduce the pregnancy rate of dwarf bitches. To determine the dog's ovulation period, you generally need to use certain adjustment techniques, and the second step is to observe some of the dog's symptoms to judge.

Dog ovulation refers to the process of eggs being released from mature follicles into the fallopian tube. When the follicles of the ovary mature, due to the continuous decrease of follicular fluid, the part of the follicle exceeds the surface of the ovary, and the follicular theca becomes thinner. At the same time, the cells of the granulosa layer begin to undergo fatty degeneration, and the follicular fluid infiltrates between the cumulus cells. The cumulus and granulosa layers gradually separate. Before ovulation, the outer membrane of the theca separates, and the inner membrane passes through the gap to form a small papilla-like protrusion, or ovulation eye point.

It stretches and becomes thinner on the surface of the ovary. The stretched ovulation eye point quickly divides and some follicular fluid flows out. After a short time, the egg moves out of the gap, and the gap gradually When the egg suddenly matures, a large amount of follicular fluid is released, and the egg is rushed out, and is collected by the fallopian tube fimbriae. The ciliated cells in the fallopian tube move the egg into the fallopian tube. The eliminated egg has not yet matured and is in the primary oocyte stage. It must be transported in the fallopian tube. After 3-5 days of meiosis, the first polar body is released and becomes a secondary oocyte, in order to gain the ability to fertilize.

The development of follicles begins approximately 11 days before ovulation, rapidly matures 2-3 days before ovulation, and ovulates on the 1-2 days of estrus. Female dogs continue to ovulate spontaneously. Although eggs can be eliminated within 14 consecutive days, about 80% of eggs are eliminated within 48 hours after ovulation begins. Under normal circumstances, the speed of ovulation is affected by the age of the dog, and young female dogs ovulate slightly slower than younger female dogs. Eggs can generally survive in the fallopian tube for 4-8 days, and can maintain fertilization until 108 hours after ovulation. The size of mature eggs in female dogs is related to the time after ovulation. According to reports, the diameter of eggs 1 day after ovulation is 280 Micron, the diameter of the egg 2-4 days after ovulation is 228 microns, and the diameter of the egg 5-9 days after ovulation is 188-200 microns.

Do not force the dog to breed after it is in heat

< p style="text-indent:2em;">It is best to determine the ovulation period of the dog through certain adjustment methods. First, check the vulva for edema, enlargement, bleeding of vaginal fluid, around the vulva and tail in early estrus. The hair is moist and sticky; the swelling is obvious during estrus, the tail swings to one side when touching the vulva and vulva, and the posterior drive increases, and the edema subsides in the later period of this period; the recurrence occurs 1-2 weeks after the onset of estrus, and the vulva is small and there is Wrinkles, with good tightness

Inspection of vaginal penetration during estrus, labor and postpartum certain stages and under certain pathological conditions. The vaginal fluid leaks out. The fluid appears blood-like in the early stage of estrus, and the color of the fluid gradually turns yellow or straw-yellow. There is little or no discharge in the late estrus and estrus period.

Vulva inspection: After cleaning the vulva, use a crotch device and a suitable light source to observe the mucosa and penetration and feel the tightness of the vaginal tract. In the early stages of proestrus, edema is obvious, the surface of the mucosa is smooth, and the The ejaculation device is easy to insert; in the later period of this period, there is resistance, the mucosa is rose red, there is edema, and wrinkles appear, and a large amount of blood-stained secretion appears. The cervix is slightly relaxed during the estrus period. There is resistance to the insertion of the ejaculation device, and the mucosa is thickened and pale. Color and wrinkles. Since changes in the vulva, vaginal canals and secretions are secondary to changes in hormone levels in the body, the estimated ovulation time is not accurate enough, and it is necessary to estimate the best dog estrus and ovulation time based on body odor to improve pregnancy. Odds.

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