When a cow comes into heat after calving, signs and duration of estrus
In cow breeding, one of the important skills is to determine when a cow comes into heat. This is necessary in order to send her on time for mating or insemination. It depends on whether the animal can get pregnant and give birth to a calf. Consider how to determine when cows come into heat after calving, how long it lasts, what drugs to use to stimulate hunting in livestock.
How many days does a cow go hunting after calving?
The appearance of the hunt can be expected in 1-2 months after the next calving. The term depends on the conditions of maintenance and nutrition, the state of health of the animal, how the birth went (with severe terms, it increases). If there are 1 or 2 cows in the household, it is quite easy to determine when she is walking. There are certain signs that an experienced livestock breeder can tell if his cow is on the hunt.
It lasts, on average, 18 hours, it is recommended to inseminate the animal in the middle of this time period - 9 hours after the start. If the animal walks around, the chances of successful fertilization are reduced. If the cow has not fertilized, the next time you need to try after a month (hunting occurs every 3 weeks).
Duration of the second hunt
To get a calf every year, cows need to be hacked in the next cycles after calving. If pregnancy has not occurred, mating is allowed in the next 1-2 repeated cycles. Each of them lasts as many hours as usual, that is, on average, 18 hours. The duration of estrus in cows is 2-6 days.
How to diagnose readiness
There are telltale signs that can be used to determine if a cow is ready for insemination. At home, this can be recognized by the behavior of the animal - it becomes restless, moves a lot, hums, eats less. You can almost accurately determine when to happen by the fact that a cow allows other individuals, and not only bulls, but also females, to jump on itself. At this time, she stands calmly, motionless. Hunting is also detected by external physiological signs: mucus is secreted from the genitals of the cow, which indicates its beginning.
In animal husbandry, there is such a thing as "quiet" hunting. This is a state of the cow's body, when the follicles mature and ovulation occurs, but there are no external signs or they are weak. Such a violation of the reproductive cycle can occur both in cows and in nulliparous heifers. The reasons for "quiet" hunting - violation of conditions of detention, feeding, lack of light or movement. Stress from moving to another room, herd, heat or high humidity.
To choose the best time for insemination, you need to consider 2 criteria: the period after calving and the period of heat. As for which cycle is better to fertilize animals, it is better to skip the first cycle, since it has been established that the functionality of the ovaries is restored faster than the uterus. One month after giving birth, the uterus may not yet be ready to bear a calf. The insemination itself is carried out 2 times with an interval of 10-12 hours, for example, in the morning, and the second in the evening. The interval for heifers may be shorter, as the duration of the heat is shorter.
How to use medicines to raise livestock hunting
There are drugs, the introduction of which into the cow's body can cause the onset of heat. For example, you can use the drug "Estrofan", its purpose is to stimulate and correct the reproductive cycles in adult cows and heifers.
It is used for functional disorders of the ovaries, postpartum endometritis, follicular cysts. The drug is administered intramuscularly, 2 times with an interval of 10 days. When, 2 weeks after the first injection, the animal goes on a spree, it happens, regardless of whether there is an external sign of estrus. Re-insemination is performed the next day.
In addition to Estrofan, the drugs Galapan, Gestavet, Surfagon, Estrovet, Fertagil, Folligon and others are used. After applying such veterinary medications, the cow begins to walk, and it can happen.
Re-insemination rules
In livestock practice, it has been revealed that the effectiveness of insemination depends on many factors, not only on the time when the cow comes into heat. The state of the body has a great influence - its health, fatness, presence or absence of diseases, mental state. In first-calf heifers, childbirth can be protracted, so it is recommended to have them 2-3 weeks before mating the rest of the cows, so that calving takes place at about the same time.
In case of artificial insemination, several individuals are inseminated with one dose of bull sperm, for which it may be necessary to adjust their hunting timing. Individuals that are planned to be inseminated should be examined every 2 weeks. If necessary, it is necessary to revise the diet and improve the nutrition of animals, because general body condition affects the functionality of the reproductive system, the manifestation of hunting and its duration.
Due to inadequate nutrition in cows, the process of follicle maturation is disrupted, they hide poorly. The same is observed in obese animals, in them the duration of estrus is shortened.
Cows with whom they keep calves can also have problems with their normal reproductive cycle. To improve the results of fertilization, it is necessary to synchronize the hunt. The calves are taken from their mothers before the procedure, then the cows are fed with nutritious feed, vitamins and premixes to bring the body back to normal. Vitamin E is especially valuable during this period, which regulates reproductive function. The lack of a substance in the feed directly affects the efficiency of the system. Such cows should be covered no earlier than 2 months after calving.
Why is there a false hunt
It happens that after insemination of a cow, she again shows all the signs of heat, and she happens again. Pregnancy comes, but according to the timing of childbirth, it turns out that fertilization occurred in the first mating. So the second hunt was false.
This can happen due to low levels of progesterone, which is not enough in the cow's body.It is removed from the body with milk. False hunting can be determined by performing an ultrasound of the ovaries. An insufficient level of progesterone not only affects the appearance of false hunting, but because of it, the number of embryo deaths increases.
Low body condition also causes false hunts in high-yield cows. The production of milk requires a lot of nutrients and energy, which the animal's body does not have time to replenish. There are changes in metabolism and hormonal levels, follicular depression and delayed ovulation. The corpus luteum is formed from the follicles, which synthesizes progesterone.
In milking individuals, this condition can be caused by the stress of overheating. During stress, the body produces the hormone cortisol, while the production of oxytocin, as well as gonadotropic hormones, decreases. As a result, there is a violation of the genesis of follicles, ovulation processes. Signs of sexual desire become less intense.
Abortion is possible in pregnant individuals. You can return the animals to their normal state by cooling the room with water or ventilation. Correct determination of the time of the onset of estrus and the duration of heat in cows is important for further insemination. The effectiveness of mating depends not only on the quality of the sperm, but, above all, on when it entered the uterus. If the timing is right, the cow is almost 100% likely to become pregnant.
For large farms, the profitability of the entire farm depends on the effectiveness of mating, since the more animals become pregnant, the more calves you can get, and therefore, get more profit. And in the household, this also matters. If you know how to determine the right time, it will be enough to mate once, and not several in a row.
