YorkieTalk.com Forums - Yorkshire Terrier Community - View Single Post

Nazir's · 04-14-2006, 01:14 PM

Yes, on average a heat cycle will last 21 days. In more details: A bitch will usually come into heat between 6-12 months. Then after, they will usually come into heat every five to nine months. The heat cycle is specific for each individual dog. By observing and documenting your dogs heat cycles you'll be able to better predict this.

The estrous, or heat cycle is divided into four stages, each corresponding to the principal hormonal influences governing that stage. The combination of proestrus and estrus, which is referred to as a heat, last an average of 21 days. One week coming, one week standing, and one week going.

Proestrus: The initial stage last an average of nine days (the range is 3-17 days). The first sign is a bloody discharge. In early proestrus, the discharge may be light pink to yellow. During proestrus the female will produce a substance called pheromones. Pheromones are what attract the male, although an experienced stud dog will not show interest until the bitch is in standing heat. During this stage, the female will show no interest in mating.

Estrus: The second phase of the heat cycle, which is also referred to as standing heat. Estrus last an average of seven to nine days (the range is 2-20 days). As estrus begins, the vulva softens and becomes pliable in preparation for intromission. The discharge becomes light pink. This is the time that the female will begin to show interest in mating.

Diestrus: The third stage in the estrus cycle, also called the luteal phase, begins when the female refuses to stand for breeding. The male also will lose interest at this time. This stage last an average of 60 days, and then merges with anestrus. If the bitch becomes pregnant, diestrus last 56-58 days and if followed by whelping.

Anestrus: The fourth phase of the estrus cycle. It's the period of time when the progesterone-stimulate endometrium undergoes repair. Progesterone levels are low, indicating little if any ovarian activity. The length of anestrus varies, lasting on average 130 to 150 days. Anestrus if followed by the beginning of a new heat cycle.

04-14-2006, 01:14 PM	#8
Nazir's No Longer a Member Join Date: Apr 2006 Posts: 67	Yes, on average a heat cycle will last 21 days. In more details: A bitch will usually come into heat between 6-12 months. Then after, they will usually come into heat every five to nine months. The heat cycle is specific for each individual dog. By observing and documenting your dogs heat cycles you'll be able to better predict this. The estrous, or heat cycle is divided into four stages, each corresponding to the principal hormonal influences governing that stage. The combination of proestrus and estrus, which is referred to as a heat, last an average of 21 days. One week coming, one week standing, and one week going. Proestrus: The initial stage last an average of nine days (the range is 3-17 days). The first sign is a bloody discharge. In early proestrus, the discharge may be light pink to yellow. During proestrus the female will produce a substance called pheromones. Pheromones are what attract the male, although an experienced stud dog will not show interest until the bitch is in standing heat. During this stage, the female will show no interest in mating. Estrus: The second phase of the heat cycle, which is also referred to as standing heat. Estrus last an average of seven to nine days (the range is 2-20 days). As estrus begins, the vulva softens and becomes pliable in preparation for intromission. The discharge becomes light pink. This is the time that the female will begin to show interest in mating. Diestrus: The third stage in the estrus cycle, also called the luteal phase, begins when the female refuses to stand for breeding. The male also will lose interest at this time. This stage last an average of 60 days, and then merges with anestrus. If the bitch becomes pregnant, diestrus last 56-58 days and if followed by whelping. Anestrus: The fourth phase of the estrus cycle. It's the period of time when the progesterone-stimulate endometrium undergoes repair. Progesterone levels are low, indicating little if any ovarian activity. The length of anestrus varies, lasting on average 130 to 150 days. Anestrus if followed by the beginning of a new heat cycle.