Cow pregnant and in heat.

Greetings and welcome to BYH Armando! So glad you joined us. The thread you posted on as been dead a long time. The last post was over 8 years ago. I'll tag a few bovine experts who may be able to address your concern. There's a wealth of info, knowledge and experience shared in the multitude of threads. Browse around and see what interesting stuff you can find. By all means post away when the desire strikes you, especially if you have questions (provide as much detail/info as possible and pictures truly help)... With all the great folks here, generally someone will respond in no time at all. Please make yourself at home!

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@farmerjan @greybeard @Wehner Homestead @jhm47

@Armando

It’s been heard of to have multiple conception dates in mammals, including humans. In relation to the dates, IF she conceived a younger one, it wouldn’t be viable when the older one was term.

We’ve had it happen before where a cow will “cycle” despite having a confirmed bred date earlier and calved according to the confirmed bred date.

I would think the potential of being injured would come more from stress from being chased and ridden or falling when being ridden.

Just my experience/opinion.

Same here. False heats aren't unusual, tho I'm not sure they are truly 'false'.

Here's a kinda old article on one study done:
https://www.ncbi.nlm.nih.gov/pubmed/2728283

Forty-three oestruses were observed in 35 pregnant cows in one beef suckler herd and 17 dairy herds; at each oestrus the pregnant cow stood willingly to be mounted by another cow or bull. Such oestruses were observed at all stages of pregnancy, although more often between 121 and 240 days, occurred more than once per pregnancy and were also seen in successive pregnancies. On one farm where the dairy cows were observed for four 30 minute periods daily, oestrus was recorded in 5.7 per cent of pregnant cows. The behavioural signs associated with oestrus during pregnancy were indistinguishable from those of true oestrus in non-pregnant animals and although its duration was shorter (mean 5.6 hours), its intensity was comparable to that of the true oestrus. Pregnant cows showing oestrus were usually seen interacting with other oestrous cows in the sexually active group. Pregnant cows showing oestrus had a higher mean condition score (3.9 +/- 0.64) than control pregnant cows (3.0 +/- 0.36). Physiological changes in the genital tract normally associated with true oestrus were not observed in pregnant cows showing oestrus. There was no ovulation or metoestrous bleeding. The characteristics of cervical mucus, including ferning patterns, were similar to those of pregnant cows at the same stage of pregnancy. Hormonal changes associated with oestrus in non-pregnant cows were not observed in the pregnant cows exhibiting oestrus. Seven of nine pregnant cows at oestrus stood willingly to be mounted by a bull. On seven occasions, bulls exposed only to cervical mucus from pregnant cows showing oestrus did not display flehmen

I had a jersey that came "in heat" 5 times during one lactation....and was confirmed pregnant to the first breeding. I had the vet recheck her 3 more times and was still pregnant to the first breeding. Sometimes there is incomplete suppression of hormones that "show heats". The biggest concern is late in the pregnancy she could be injured by the bull or other cows riding her. There doesn't seem to be any problems from the bull actually breeding her. If by slight chance, there is an egg released later after the first one is fertilized, they often do not implant. I have never heard of a dual pregnancy resulting in 2 calves at different dates, but am not saying anything is not possible.....just highly unlikely.
If you are breeding AI and think the cow may be preg to an earlier breeding, I have found that it is safe to NOT GO THROUGH the cervix but to deposit the semen in the uterine tract. This way you will not disturb the "plug" that forms to keep the uterus basically germ free once the fetus begins to develop.