Lh Surge And Ovulation Timing In DogsUnderstanding Luteinizing hormonehttp://lhhormone.orgSandra asks…What happen when a f...
there is large variation (range 3 to 21 days). At this point, the discharge may be absent, orperhaps straw coloured. This ...
Stages of the Canine ReproductionIn dogs, the reproductive cycle varies a lot. A bitch can begin her first estrous cycle (...
standing in one place, maybe shuffling her feet, while at the same time, lifting her tail to allowthe male to sniff her hi...
Sandy asks…when is a dogs heat over!?my female and male dog are seperated right now cause my female went into heat. My mal...
about 5 months.Hopefully that answers all of your questions. If not surely one of the sources that I listed belowcan help ...
Lisa asks…Why is there some blood in my CM? Ovulation spotting?Well, my period started on the 31st of last month, and then...
I experienced this once or twice in the past and asked my doctor about it as I was concerned,he said not to worry as it ha...
Pregnancy Advisor’s answers:1) If you’re not having periods, there’s no reason to expect that you’re ovulating at all.Ovul...
Powered by Yahoo! Answers                                   Answering Your Questions on LH Surge                          ...
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Lh Surge And Ovulation Timing In Dogs

  1. 1. Lh Surge And Ovulation Timing In DogsUnderstanding Luteinizing hormonehttp://lhhormone.orgSandra asks…What happen when a female dog is in heat?What are the signs of dog in heat?Can the dog breed when not in heat?Are dogs in heat agressive?How long does the heat last for?Pregnancy Advisor’s answers:Sexually mature female dogs will go through a heat cycle once, or more commonly, twice ayear. Each cycle consists of four stages:1. Proestrus: Characterized by swelling of the vulva and release of a bloody vaginal discharge.Sometimes the discharge is milky and other times dark red (or somewhere in between incolour). Between bitches, there is a large variation in the length of proestrus, with an averagelength of 9 days, and a range of 1 to 17 days. This is the “pre-heat” during which the male isprogressively more attracted to the female, but the female still rejects the male. This is a highfemale hormone (estrogen) stage.2. Estrus: This phase is often termed standing heat because it is during this stage that thefemale will receive the male dog. Average length for estrus is 9 days, but again, between dogs 1 / 10
  2. 2. there is large variation (range 3 to 21 days). At this point, the discharge may be absent, orperhaps straw coloured. This stage is characterized by an increase in progesterone hormoneand an LH (luteinizing hormone) surge that leads to ovulation.3. Diestrus: At this point, the female usually no longer stands for the male, especially further intothe diestrus stage. Vaginal discharge tapers off and the diestrus phase lasts an average ofabout 60 days. Diestrus begins 6 days after ovulation. Progesterone hormones remain highthroughout this phase.4. Anestrus: This is the resting phase between the active portions of the cycles. It normally lastsabout 5 months.Hopefully that answers all of your questions. If not surely one of the sources that I listed belowcan help you out.Mandy asks…is my golden retriever going into her heating cycle?her nipples are pink, she barks a lot which is not normal , and she can’t hold her bladder whichnever happens, but the only thing is, is that she’s not swollen and i dont see any blood unlessshe’s cleaning herself. What other symptoms would let me know definetly she’s in heat?she’s also getting out of her cage which that never happensPregnancy Advisor’s answers: 2 / 10
  3. 3. Stages of the Canine ReproductionIn dogs, the reproductive cycle varies a lot. A bitch can begin her first estrous cycle (heat cycle)at 6 months or as late as 2+ years. Generally though, puberty in canines begins at around 12months, but in larger breeds it is usually at about 18 months to 2 years. A normal healthy bitchwill usually cycle on a regular basis, every 4 to 12 months. This is largely breed dependent, forexample the German Shepherd will cycle every 4 months. As they get older, bitches will cycleless frequently.There are four stages in the canine heat cycle (estrous) in dogs:Proestrus: Getting ReadyProestrus is the time when a bitch’s reproductive tract is preparing for the possibility ofbreeding with a male dog. This lasts an average of about 10 days, but can be as little as 3 or aslong as 3 weeks. Its onset is usually accompanied by a bloody discharge from the vagina aswell as swelling of the vulva. A bitch that cleans herself can be hard to detect for a few days, soit is a good practice to lift her tail and check every day. This seems strange, but will becomehabit in time, and is the only way to be sure you have got the first day of her heat cycle.Dogs will become attracted to a female during proestrus, but she’ll show little interest in themale at this stage. The walls of the bitch’s reproductive tract thicken during proestrus and youcan use a cotton swab to collect epithelial cells (cells from the uppermost layer of the skin) fromthe reproductive tract of the bitch, to view under a microscope. This is used to see how long sheis into the cycle.The epithelial cells size and shape will change as the estrous cycle progresses. In the anestrusstage of the canine heat cycle, the epithelial cells of the reproductive tract are small and roundwith a dark spot in the middle (the nucleus). As proestrus ensues, these cells become larger,more angular and have little staining of the nucleus and they increase in number. Under amicroscope, many red blood cells and some white blood cells, which were not present in theprevious stage, can be seen in proestrus.Hormone levels also change during proestrus. Although estrogen levels rise in anestrus, theystay relatively low during the early part of proestrus. As the bitch enters the later stages ofproestrus, however, estrogen levels continue to rise, reaching their peak near the end of thisstage. Estrogen begins to fall as progesterone levels begin to rise. Progesterone remains highthroughout the next two stages of the heat cycle, and is the hormone routinely used to test forwhen a bitch is about to ovulate and, therefore, should be bred.Estrus: She’s ReadyEstrus is the second stage of the estrous cycle. It also lasts an average of 9 to 11 days, but canvary from 3days to 3 weeks. This is the time when the bitch accepts the male dog for breeding.During this stage, she sometimes exhibits a behavior called “flagging.” This involves the bitch 3 / 10
  4. 4. standing in one place, maybe shuffling her feet, while at the same time, lifting her tail to allowthe male to sniff her hind end.During estrus, the vaginal discharge decreases, becoming less bloody in many dogs. Thedischarge will become a straw olor. None of the small round epithelial cells that were typical ofearly proestrus can be seen under a microscope in estrus. Rather, a lot of angular platelets canbe seen, stacked on top of each other.The progesterone level continues to rise. Near the onset of estrus, there is a very short rise inanother sex hormone, luteinizing hormone (LH). Once this has peaked, ovulation usually occurswithin 24 to 48 hours. The prime time to breed the dog is approximately 2 days after ovulation or4 days after the LH surge.Diestrus: Progesterone DominatesThe next stage of the heat cycle, diestrus, is considered the period when progesteronedominates the hormone scene. Diestrus lasts from 60 to 90 days in a dog that doesn’t becomepregnant or approximately 63 days in a dog that does become pregnant.In diestrus, the vaginal discharge will stop and the epithelial cells of the reproductive tractquickly appear small and round again. White blood cells can be seen in very high numbersduring the first few days of diestrus. This is normal, since their function is to clean up the cellulardebris left behind by estrus.Anestrus: The Final StageThe final stage of the heat cycle is called anestrus. Anestrus lasts an average of 4 to 5 months.During this time the sex hormones are at very low levels, although they do continue to havesmall rises and declines throughout this stage. If a swab of the reproductive lining is taken andviewed under a microscope at this stage, very few epithelial cells can be seen.Also check out:http://www.vetmed.lsu.edu/eiltslotus/Theriogenology-5361/the_normal_canine.htm 4 / 10
  5. 5. Sandy asks…when is a dogs heat over!?my female and male dog are seperated right now cause my female went into heat. My male isgoing CRAZY! he constantly whines when in or out of the house! its driving me nutz! he wasfine last week but this week he is out of control going crazy!I know what everyone is going to say… to get her fixed. I havent because I am looking intofinding a new home for her because my relationship is failing and I dont have any options andjust cant care for her right now. With work and trying to find an apartment- she is a big dog andneeds a backyard. So I didnt get her fixed in case the next owner doesnt want her fixed.Pregnancy Advisor’s answers:Sexually mature female dogs will go through a heat cycle once, or more commonly, twice ayear. Each cycle consists of four stages:1. Proestrus: Characterized by swelling of the vulva and release of a bloody vaginal discharge.Sometimes the discharge is milky and other times dark red (or somewhere in between incolour). Between bitches, there is a large variation in the length of proestrus, with an averagelength of 9 days, and a range of 1 to 17 days. This is the “pre-heat” during which the male isprogressively more attracted to the female, but the female still rejects the male. This is a highfemale hormone (estrogen) stage.2. Estrus: This phase is often termed standing heat because it is during this stage that thefemale will receive the male dog. Average length for estrus is 9 days, but again, between dogsthere is large variation (range 3 to 21 days). At this point, the discharge may be absent, orperhaps straw coloured. This stage is characterized by an increase in progesterone hormoneand an LH (luteinizing hormone) surge that leads to ovulation.3. Diestrus: At this point, the female usually no longer stands for the male, especially further intothe diestrus stage. Vaginal discharge tapers off and the diestrus phase lasts an average ofabout 60 days. Diestrus begins 6 days after ovulation. Progesterone hormones remain highthroughout this phase.4. Anestrus: This is the resting phase between the active portions of the cycles. It normally lasts 5 / 10
  6. 6. about 5 months.Hopefully that answers all of your questions. If not surely one of the sources that I listed belowcan help you out.Mary asks…Dog Estrus Cycle & LH peak?I do not monitor for LH Surge, I have a girl who has been in Standing Heat for 11 days, andmay continue. How can I accurately determine a due date? I have been keeping track of hermood and other differences over the last week, are there any behavioral changes when the LHlevel goes up?Pregnancy Advisor’s answers:As far as I’m aware, the only reliable point you can time from is the LH Surge (which coincideswith ovulation). Behavioral markers won’t necessarily be accurate. 6 / 10
  7. 7. Lisa asks…Why is there some blood in my CM? Ovulation spotting?Well, my period started on the 31st of last month, and then seemed to stop completely on the2nd (but got a little heavy again and had some spotting on the 3rd and 4th). My boyfriend and Ihad sex (with a condom, mind you, so this isn’t an am-I-pregnant question) on the 2nd and 3rd.After that, I dried all up down there, which is normal. Well, I’ve started watching what I eat andexercising a little, and today I ran with my dog (but nothing out of the ordinary). Just about 10minutes ago, I had more diarrhea (sorry TMI) and I think that’s from changing my diet, butwhen I happened to glance down, there was a long, stretchy strand of pinkish CM hanging frommy vaginal opening, and it was VERY stretchy. When I wiped, there was a little bit of red bloodmixed in with the CM. This has never happened before. Do you think it’s from exercising? Orcould this be ovulation spotting? My bf and I haven’t had sex since the 4th, so it can’t be fromthat. Should I be worried?Pregnancy Advisor’s answers:There are a couple of thoughts on what causes ovulation spotting. Some people believe that thelight spotting is a result of the egg rupturing through the follicle during ovulation. It is thoughtthat as the egg bursts from the follicle that a little bleeding may occur. This is why some womenmay notice brown/pink spotting, which is generally an indicator of older blood, around the timethey ovulate. The blood may turn brown as it exits the body.The other possible explanation for ovulation spotting is that the spotting is a result of awoman’s changing hormones during ovulation. As a woman’s body prepares to ovulate,follicles will start to grow and mature. As they mature they produce more estrogen. Thisincrease in estrogen triggers a surge in LH, another hormone involved in ovulation. When LHsurges it signals the mature egg to burst from the follicle. Estrogen rises sharply right before awoman ovulates and it is thought that the increase in estrogen levels may cause light spotting tooccur. 7 / 10
  8. 8. I experienced this once or twice in the past and asked my doctor about it as I was concerned,he said not to worry as it happens to some women and it is quite rare for it to happen, but it justmeans that you are really fertile at that moment and if wanting to conceive that would be theperfect time. If not wanting to conceive, he said to use protection such as condoms. I wouldrecommend that if you have any concerns that you consult with your doctor for furtherevaluation and peace of mind should you wish.Good luckLizzie asks…Does this mean I am pregnant?I am currently TTC. I took a Clearblue digital ovulation predictor test, and it came up as “notovulating”. My BBT temp was 98.6 degrees, but this is also my first day taking the temp.When I take the insert out of the tester, there is a little window, that before I peed was all whiteand clear, and now there is a solid blue line, and a faint blue line to the left. Basically, to me itlooks like a pregnancy test (faint line would be the line indicating pregnancy) but I don’t know.Nowhere in the booklet does it discuss a pregnancy test, and when I called the number it isnothing but automated questions..Sooooo does this mean I may be pregnant? I have an e.p.t test here, but the directions say touse on the first day of your missed period, and that shouldn’t be till a couple weeks from now?Background info: I have PCOS, I only get periods when I’m on birth controlThere are two parts to this tester. One that you pee on, then insert. That has the little windowwith the one line and one faint line. Then there is the thing i inserted it into which tells medigitally if I am ovulating or not. 8 / 10
  9. 9. Pregnancy Advisor’s answers:1) If you’re not having periods, there’s no reason to expect that you’re ovulating at all.Ovulation itself is what causes the period to come (about two weeks after ovulation) in a normalcycle. There are other reasons that a woman might bleed even if she isn’t ovulating. So justhaving a period isn’t a guarantee that you ARE ovulating. But not having a period is pretty firmsign that you’re NOT ovulating.2) As you’ve already been told, ovulation testers and pregnancy testers work differently. Apregnancy test is just looking for a hormone called HcG for short. If you have even a little HcGthat causes a second line on the test, you’re pregnant, because HcG in any amount is rarelyaround except if you’re pregnant. You know that.But you bought an ovulation test kit. That’s why it doesn’t say anything about pregnancytesting in the kit. It’s not meant for that. Your confusion is due to lack of experience. It is similarto a pregnancy test only in the same sense that a cat is similar to a dog. Yes, they’re a littlealike in basics, but ultimately, they’re two different beasties.Ovulation tests are measuring a hormone called LH for short. LH is ALWAYS present in yourbody, even if only a very little bit. So the tests will always have a second line, however faint,because there is ALWAYS LH in your body. It takes a certain high amount of LH for ovulation tohappen, though, called an “LH surge.” So an ovulation test is only considered positive if thesecond line is equally dark or darker than the control line. That indicates that there areunusually high levels of LH.3) LH presence doesn’t officially mean you’re ovulating. At least, not yet. Ovulation usuallyfollows about 12-36 hours AFTER the LH surge. The hormone needs some time to work. But itdoes mean that you should make sure to have intercourse then if you’re TTC. In some cases,though, you should be aware that LH surges may fail and result in no ovulation at all. Ovulationtest kits have no way to confirm whether ovulation truly does happen after it detects the LHsurge.4) Any kind of tester–ovulation or pregnancy– that is digital is meant for you to rely solely uponthe digital part anyway. Don’t look at anything else.5) Wasting money on all those testing kits when you’re not even ovulating is a bizarreinvestment, really. No ovulation = no periods = no possibility of pregnancy. While you couldtheoretically start ovulating again at any time (which is why someone not wanting kids shouldstill use protection), you cannot bank on it EVER happening on its own until the cause isidentified. If you are extremely over or under weight, or if you are on an intense athletic trainingregimen, or have PCOS complications that need to be brought under control, or whatever, thoseissues will have to be addressed or you will never ovulate anyway. Getting testing kits to seewhen you ovulate when you already know you don’t ovulate is just a waste, though. 9 / 10
  10. 10. Powered by Yahoo! Answers Answering Your Questions on LH Surge http://LHSurge.org Lh Surge And Ovulation Timing In Dogs 10 / 10Powered by TCPDF (www.tcpdf.org)

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