age of calf first heat
What age will my dog come into her first heat? First heat can vary greatly dog to dog. The youngest is about six months of age though sometimes a female will come into season younger. First heat can start as late as 12 or even 14 months of age or later in rare cases. Again, it can vary dog to dog. The discounted present value of the. $403 total is $351, which is the opportu-. nity cost of an open heifer. That value il-. lustrates the importance of getting first-. calf heifers rebred, Hughes says. When a heifer doesn’t rebreed, the. cost of keeping her for a year must be ab-. sorbed by the females that do raise a calf, Progesterone is the. predominant hormone between. heat cycles and during pregnancy. It is responsible for and necessary. for continuation of pregnancy once. an embryo establishes itself in the. uterus. Progesterone suppresses. further development of follicles. in the ovary and, thus, thwarts. production of estrogen. 36 HEREFORD WORLD / March 2008 www.hereford.org. Normal reproduction in. the cow depends on. interaction among several. hormones, especially estrogen. and progesterone, which are both. produced by the ovary. Post by theburrowfarm on Dec 30, 2012 18:47:18 GMT -5. She can go in to heat as early as 4 months .You should wait till she is 14 months to breed her . Post by Dahdo on Dec 30, 2012 21:54:15 GMT -5. We just had our 8.5 month old heifer have her first heat. We had three similar aged bull calves in with her so I was a little worried. She had a second heat 17 days later which was a bit early, but it was a relief. You are right to keep them separated until she is at least 14 months. If she’s going to make a career of being. a brood cow, it’s important that she raise a. calf each and every year. The odds of her. coming up short on the rent are greatest. when she’s 2 years old and it’s time to con-. ceive her second calf. A rise in estrogen is what. brings the cow into heat; then. progesterone levels rise while she’s. still in heat, since progesterone. is crucial for preparing the. uterus to receive a fertilized egg. and providing an environment. where it can grow. If she conceives on her next es-. trous cycle, her calf will lose 21 days of. growth against a common weaning date. Either way, she’s not living up to her prof-. it potential. If she’s going to do her job year in and. year out, she must become pregnant. within 85 days of calving. Heifer breeding age. Post by mhlippert on Dec 30, 2012 18:44:29 GMT -5. We have a 10 month old heifer (Francine) and do not know when we should expect her to go into heat and/or be ready to breed. We have a small herd with one young bull, two steer, one cow and the heifer. Several other hormones play a. role in reproduction. Prostaglandin. is secreted by the uterus and causes. the CL on the ovary to regress so. follicles can develop and create. estrogen to trigger a new heat. cycle.
14 months