Gomer bulls do make good heat detection aids because they are naturally adept at identifying cows in heat. I was wondering how often a sow comes into heat. A second study also confirmed that mounting activity occurs more frequently when cows are on dirt rather than concrete. In order to get her to calve on the same date as the previous years, allow for 80 to 90 days of rest before getting her bred again. The basic estrous cycle of the cow averages 21 days in duration (a range of 18 to 24 days) and extends from one period of heat (estrus) to the next. These periods follow a cycle controlled by hormones. This can be used to help synchronize farrowing dates in small herds so that animals are farrowing around the same time, and can be weaned of piglets (and therefore bred for their next litter) at the same time. Hilda is taller then he is. I have bull calves that are trying at 2-3 months of age. A cow will come into heat once every 17 to 24 days (average is ~21 days), depending on age, breed, and body condition. Note, however, that these signs are not as obvious in sheep as in cows. I don't think many cows will come into heat (estrus) before 35 day post calving. The optimum time to breed her is 45 to 60 days after she has had a calf. ... How often do beef cows come in heat? A cow should be bred back after she has had a calf. As Kim said, 10 to 14 (or sometimes 18) days after calving. Grass hay and alfalfa don't not have enough energy, so you will need to added some corn, distillers, gluten, silage, etc to the diet. There are four parts to the estrous cycle. When five estrous cows were individually presented with an opportunity to spend time on dirt or on concrete in the presence of a tied cow which was either an estrous cow or a cow not in heat, the test cow spent an average 70 percent of the time on dirt. I am very doubtfull that he was able to do the deed see he seemed to be a little too short. Signs of heat There are several behavioral signs of estrus, which are often more pronounced in heifers than in cows. ... A lot of the diets that I see for these females after calving is often deficient in energy. Cows or heifers go into estrus once every 17 to 24 days. Bulls will breed when they can get "it" in. An average animal in heat today will be in heat again in three weeks. The estrus period itself only lasts for around 18 to 24 hours. The cycle is repeated every 14 to 19 days. As the animal comes into heat, she is restless and may bawl and wander in search of a bull (traveling three or four times as much as she would normally do), sniffing other cattle. But that’s not to say that it’s a safe time for a cow to become rebred, because it isn’t. ruptures at the end of heat and releases its egg. Proestrus lasts for one to three days immediately before the cow comes into estrus or heat. 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