Problems associated with breeding (Continued)

Now that we have documented the pertinent discussions pertaining to the roles, prerequisites and expectations of the brood bitch and the stud dog, we can proceed with answers to the salient question of when to breed.

This is not a straightforward issue.  We must first of all understand the estrus cycle (when and for how long the female dog is in heat).  Not understanding this heat cycle is perhaps the most common cause of an unsuccessful mating.  Some ‘breeders,’ because of their lack of technical knowledge/experience, just simply put their dogs together at the wrong time.  So let’s discuss this estrus cycle in some detail.

Estrus cycle

Firstly, let us understand that the female dog could show the first signs of heat (estrus) as early as eight months of age.  Usually, the first ‘heat‘ appears when she is about 10 months old.  There are no fixed times; just as a woman can be pregnant for 8½ months, 8 ¾ months, 9 months, 9½ months, etc, before delivery. We are dealing with biology and not the exact science of mathematics.

Secondly, unlike what the general feeling is, a bitch only comes in heat about twice a year (again, this can vary), but I have known bitches to come into heat every 4 months or so.  This, however, is the great exception.  I will now rely on a very adequate and simple text put together by Drs Carlson and Giffin on this subject.
As a general rule, estrus, the season of heat, lasts 21 days, as reckoned from the first sign of vaginal bleeding.  The onset of heat (called proestrus) lasts six to nine days.  A dark bloody discharge and firm swelling of the vulva signal it.  It is during this stage that the female begins to attract the male who is able to detect chemical substances, called pheromones, which are discharged from her vulva and excreted in her urine.

During this preovulatory (before the eggs are released from the ovary) phase in the heat cycle, the female will not accept the male.  If mating is attempted, she will jump away, sit down, growl or snap at the male to drive him away.

The second phase of the estrus cycle is called true estrus or standing heat.  It is the time during which the female is receptive.  She begins to flirt with the male, raises her tail and flags it to the side, lifts her pelvis and presents her vulva when touched in the rear.  The vulva softens and the discharge becomes watermelon coloured or pinkish.
A microscopic examination of the vaginal secretions at this time will show a marked reduction in the number of red cells.  A few white cells will be seen.  Also, there are changes in the appearance of the surface cells of the vaginal lining.  These changes enable a veterinarian to determine whether the bitch is ready to be bred.

A pensive look on the face of this female dog as she waits at the GSPCA in the hope that an animal lover will adopt her (she has been spayed)

There is another test for ovulation, which utilizes a paper strip to test the mucus from the cervix of the uterus.  This is the same sugar test tape used by diabetics to check for sugar in the urine.  The test is based on the fact that sugar appears in the mucus of the cervix when the bitch begins to ovulate.  Insert the paper strip into the vagina near the cervix and leave it for one minute.  Then remove it and read the colour.  A negative sugar test suggests that the bitch is not ovulating.  However, a positive test may be a false positive if a vaginal infection is present.  This test is not as predictable as a vaginal cell test mentioned above.

Estrus, or standing heat, lasts 6 to 12 days.  It ends when the female refuses to stand for the male.

The third phase in the productive cycle is called metestrus.  It begins when the female refuses to stand for the male and lasts through the period of uterine repair (about 60 to 105 days).  After a bitch has gone into heat once, her breasts and vulva will remain slightly larger than before.

The fourth phase of the reproductive cycle, called anestrus, is a period of reproductive rest.  It lasts 100 to 105 days.  The heat period usually comes every six to eight months.  However, as I have said earlier, some bitches go into heat every four months and others only once a year.  Several factors, such as the time of year, hereditary tendencies and emotional states, have a bearing.  Some of these will be discussed when we write about infertility.

More in Features, Sunday

future notes1

Unifying general and technical education

I argued last week that the physical and institutional infrastructure and processes within the education system have changed significantly in recent times.

Latin View

Trump’s coronation was like that of a ‘maximum leader’

I learned in journalism school that what you see often is more important than what you hear, so I decided to turn off the television volume during much of the Republican National Convention that proclaimed Donald Trump as the Republican’s presidential candidate, and to take notes.

default placeholder

Three welcome developments: The appointment of the Tax Chief, the Head of FIU, and the Bid Protest Committee

Three important appointments were recently announced, namely the Commissioner-General of the Guyana Revenue Authority (GRA), the Director of the Financial Intelligence Unit (FIU) and members of the three-person Bid Protest Committee.

20160725Dave Chadee

Caribbean chases Zika preparedness, after death of mosquito expert

By Gerard Best   Gerard Best is a researcher and writer covering social issues across the Caribbean and Latin America. Based in Trinidad and Tobago, he is the former New Media Editor at Guardian Media Limited and the Caribbean Communications Network, the country’s largest media companies.

These children enjoyed being pushed home by a cousin

Riverstown

Riverstown, a village on the Essequibo Coast, is pressed between Pomona and Airy Hall. Once you cross the railway-like bridge over a black water creek, you’re in Riverstown, where there are more than 700 residents.

lucasjuly14

Mobile money: a technological fad or serious economic business?

No one knows Imagine talking to a friend on the phone while thousands of dollars are pressed to your ears and no one knows it. 

Comments

About these comments

The comments section is intended to provide a forum for reasoned and reasonable debate on the newspaper's content and is an extension of the newspaper and what it has become well known for over its history: accuracy, balance and fairness. We reserve the right to edit or delete comments which contain attacks on other users, slander, coarse language and profanity, and gratuitous and incendiary references to race and ethnicity.

Stay updated! Follow Stabroek News on Facebook or Twitter.

Get the day's headlines from SN in your inbox every morning: