Author Topic: The Heat Cycle of the Bitch  (Read 224 times)

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Offline DogMan

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The Heat Cycle of the Bitch
« on: September 26, 2019, 01:03:40 pm »
Bitches become sexually mature when they exhibit their first heat period, usually between 6 and 16 months of age, depending on the size and breed. Most bitches come into heat twice a year. The exceptions to this rule are basenjis and our local mongrel which typically exhibit only one heat cycle per year.  The heat or estrous cycle of an intact (unspayed) and nonpregnant bitch is divided into four separate phases:

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Offline Bukky

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Re: The Heat Cycle of the Bitch
« Reply #1 on: September 26, 2019, 01:17:42 pm »
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Offline Admin

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Re: The Heat Cycle of the Bitch
« Reply #2 on: September 26, 2019, 01:29:28 pm »
Nice one @DogMan , seat booked as well.  :D :D :D

Offline DogMan

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Re: The Heat Cycle of the Bitch
« Reply #3 on: September 27, 2019, 10:08:37 am »
Proestrus: The most reliable indicator of the beginning of this phase is the bloody vaginal discharge. This bloody discharge is due to the leaking of red blood cells from capillary vessels lining the uterus into the lumen of the uterus. Other indicators are swelling of the vulva and frequent licking of the external genitalia. During proestrus the bitch will attract male dogs but will not allow mounting or mating. Proestrus usually lasts between 6 to 11 days, but generally lasts for nine days. During this phase the follicle-stimulating hormone (FSH) and the luteinizing hormone (LH), both secreted by the pituitary gland, stimulate growth and development of follicles within the ovaries. Furthermore, the levels of the hormone estrogen, which is primarily produced by the follicles, rise gradually in the bloodstream causing behavioral estrus in the bitch.

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Offline DogMan

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Re: The Heat Cycle of the Bitch
« Reply #4 on: September 27, 2019, 05:54:09 pm »
Estrus: This  phase  begins when the bitch allows mounting or mating.  To indicate sexual receptivity, the bitch crouches, elevates the rear quarters toward the male and moves the tail to one side. During this phase the vaginal discharge becomes a straw or light pink color.  The average duration of estrus is about nine days, but it can last from 2 to 21 days. During this phase estrogen levels decrease and progesterone levels increase. Furthermore, it is during estrus that ovulation (release of eggs from ovarian  follicles)  takes  place.  A surge in LH from the pituitary gland triggers ovulation, which occurs 1 to 3 days after LH levels peak in the bitch's bloodstream.  All mature ovarian follicles rupture and release their eggs into the oviducts within 24 to 48 hours. Generally, larger dog breeds ovulate more eggs than smaller breeds. Released eggs undergo maturation in 2 to 3 days and remain viable for a period of 12 to 72 hours. Following ovulation, each ruptured follicle changes to corpus luteum, a yellow body responsible for increasing progesterone levels during estrus. It is worth mentioning at this point that extreme care must be taken during the estrus phase in order to prevent unwanted pregnancies.  The bitch must be supervised when she is allowed to go out into the yard or taken out for walks.

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Offline DogMan

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Re: The Heat Cycle of the Bitch
« Reply #5 on: September 28, 2019, 08:27:27 am »
Diestrus: This phase, which lasts about two months, begins with the bitch becoming unattractive to the male dog and lasts until the corpora lutea (plural of corpus luteum) regresses. Hence, diestrus is under the influence of the hormone progesterone. If the bitch has been bred, this phase is the beginning of pregnancy. However, whether or not the bitch has been bred and becomes pregnant, the corpora lutea are maintained and remain functional, secreting progesterone, which is important for the maintenance of pregnancy.

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Offline DogMan

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Re: The Heat Cycle of the Bitch
« Reply #6 on: September 28, 2019, 11:35:23 am »
Anestrus: This phase is considered to be a quiet rest stage in the estrous cycle. Factors such as breed, age, size, and health condition will influence the duration of anestrus. The length of anestrus varies, lasting on average about 3 to 5 months. During this phase, the bitch shows no signs of heat and no sexual interest in males. Following anestrus, the heat cycle begins again.

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Offline Admin

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Re: The Heat Cycle of the Bitch
« Reply #7 on: September 28, 2019, 01:24:15 pm »
Thanks for the lecture @DogMan , great job!

Offline DogMan

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Re: The Heat Cycle of the Bitch
« Reply #8 on: September 28, 2019, 02:39:57 pm »
Thanks for the lecture @DogMan , great job!
You're welcome boss.

 

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