I was going to stay out of thisone, due to having talked about it several times in thepast, but I see there are still a few "Mis-Conceptions" on the subject -- hehehe!
First of all, just prior to coming into heat, your cow will engorge the uterin ling with very red cell rich blood, to get ready for pregnancy once ovulation takes place.
The "Follicle" on the ovary that contains the oocyte (Unfertile egg) will only rupture after the full curve of hormes are achieved -- they come in heat, ride for 12-15 hours, spend several hours inpost heat , and then ovulate after getting the signal from a released hormone called LH ( Signalled from the initial release of Gnrh)
There is VERY little blood in the wall of the follicle, very little.
Once the ovualtion occurs andwithin several hours -- the system will already know if she settled or not, a signal charge is given off by the newly fertilized egg.
If there is no signal detected from a fertile egg, the uterus will quickly reset itself and start to slough off the heavy blood supply it was carrying in the endometium. This is usually very bright red blood, and will be fairly profuse. Not all cows are seen bleeding -- due to the actuall transport of that blood -- it is just sometimes either absirbed in the vagina or diluted with urine at the time she would normally show, but is washed away during urination.
The bottom line is this -- the AVERAGEcow will bleed very slightly even when fertilized, and you may never see it. The "OPEN" cow will always bleed off completely to get ready for the next cycle. Again yo umay not see it, but if you do -- you will see her bleeding at about 48 hours form her initiall standing heat, or 30-36 hours after she is done standing. The blood will be bright red if fresh, but very dark if it was in the system for a while before showing up outside the vulva.
That is the process, and again, themore you see the lower the preg rate --
Ihae even gone so far two or three times over the years to re-shoot the cow if I see a great deal of blood, trying to save a week or 10 days. Based onat least 20 years worth of my own cows records, I have never had a cow be open with no bleed off, and have had 2 return that I had seen bleed heaviliy. The more blood you see, the lower chance of pregnancy!
The really dark blood would be most likely that blood that for some reason was not expelled for an extra day later than normal.
Guys, I hope that helps sum up this topic, it canand will DRIVE YOU nuts if you let it! hehe
(thumbsup)
Terry
PS -- Breed them well after all standing is done, you will not have to worry about bleed off nearly as much! My experiences, but you will get more bulls that way too.