Linked in a cycle with ovulation, heat is the time when the cow will accept a bull. If the egg is not fertilized, pregnancy does not occur, and the cycle repeats itself in about 21 days see Table 1. The body, located near the cervix, is the site for semen deposition during artificial insemination AI. The corresponding uterine horn then houses the fetus during its initial stages of development. The vulva becomes swollen and moist during the period of heat estrus. Choose replacement heifers that, once introduced, possess the ability to remain in the cow herd for a long time. Low pregnancy rates for yearling heifers.
Vulva--The external opening, or entrance, to the cow's reproductive tract. If it is fertilized, the egg begins a series of cell divisions as it migrates down the oviducts. There is a "blind pouch" in the vagina that bears little significance, except it often poses a problem for inexperienced AI technicians who may mistakenly place the tip of the insemination rod into this vaginal pouch rather than into the uterus. Low percentage of heifers rebreeding for their second calf. Estrus, ovulation, and pregnancy are controlled by hormones. However, since reproduction has more to do with profitability than any other trait, it should definitely be emphasized. Breeding heifers 21 days earlier than the mature cow herd Reproduction in the Cow The cow's reproductive tract is located in her pelvic and abdominal cavities and consists of a pair of ovaries, a pair of oviducts also called fallopian tubes , the uterus, cervix, vagina, and vulva Ovaries--Reproductive glands, which produce the female sex cells called eggs, or ova and the hormones estrogen and progesterone. The fertile heifer looks feminine, and has a normally developed udder. There are several stages at which heifers should be evaluated, and kept or culled: Heat usually lasts 14 to 18 hours. Oviducts--A pair of tubes that extends from the ovaries to the uterine horns. Vagina--Functions as the "birth canal" during calving, and the site for semen deposition when the cow is serviced by a bull. Ovulation then follows 30 hours after the onset of heat. There are cells in these follicles that produce estrogen. High losses at first calving. Consider replacement heifers as investments in the future; your management practices need to ensure that they calve early. The body, located near the cervix, is the site for semen deposition during artificial insemination AI. Each egg is produced in a blister-like structure on the ovary called a follicle. If the egg is not fertilized, pregnancy does not occur, and the cycle repeats itself in about 21 days see Table 1. You should focus on three problem areas: Selection and Management of Replacement Heifers Replacement heifers are "reinforcements" for the herd, used to either replace cows that have been culled, or to increase herd size. The corresponding uterine horn then houses the fetus during its initial stages of development. Low pregnancy rates for yearling heifers. The gestation period pregnancy lasts about days. Sperm cells in the semen travel from the body of the uterus through the uterine horns to the oviducts.
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