When a cow comes into heat after calving: signs and duration of estrus

In breeding cows, 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 become 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 heat in cattle.

How many days does a cow come into heat after calving

The appearance of hunting can be expected 1-2 months after the next calving. The term depends on the conditions of keeping and nutrition, the state of he alth of the animal, how the birth went (in case of severe, the period increases).If there are 1 or 2 cows in the household, it is quite easy to determine when she walks. There are certain signs by which an experienced breeder can tell if his cow is in heat.

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 goes too far, the probability of successful fertilization decreases. If the cow is not fertilized, the next time you need to try in a month (hunt occurs every 3 weeks).

Duration of rehunting

To get a calf every year, you need to have cows 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 the same number of 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 characteristic signs by which you can determine whether a cow is ready for insemination.At home, this can be recognized by the behavior of the animal - it becomes restless, moves a lot, mooing, eating less. It is almost unmistakable to determine when to happen by the fact that the cow allows other individuals to jump on herself, and not only bulls, but also females. At this time, she stands calmly, motionless. Heat is also detected by external physiological signs: a cow secretes mucus from the genitals, which indicates its beginning.

In animal husbandry there is such a thing as "silent" hunting. This is the state of the body of cows, when the follicles mature and ovulation occurs, but there are no manifestations of external signs or they are weak. Such a violation of the reproductive cycle can be both in cows and in nulliparous heifers. The reasons for "quiet" hunting are violation of the conditions of detention, feeding, lack of light or movement. Stress from moving to another room, herd, exposure to heat or high humidity.

In a state of "quiet" hunting, cows often remain barren, the time for the next one is extended - it can take up to 2 months when the animal can again happen.

To choose the best time for insemination, you need to consider 2 criteria: the period after calving and the period of hunting. As for which cycle is best 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. A 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 they have shorter periods of heat.

How to increase the hunting of livestock with medicines

There are drugs, the introduction of which into the cow's body can cause the onset of hunting. For example, you can use the drug "Estrophan", its purpose is to stimulate and correct the sexual 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 takes a walk, it happens, regardless of whether there are external signs of estrus. Re-insemination is carried out the next day.

In addition to "Estrofan", the drugs "Galapan", "Gestavet", "Surfagon", "Estrovet", "Fertagil", "Folligon" and others are used. After the use of such veterinary medicines, the cow begins to walk, and it can happen.

Re-insemination rules

In livestock breeding practice, it has been found 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 he alth, fatness, the presence or absence of diseases, mental state. First-calf heifers can be protracted, so it is recommended to have them 2-3 weeks before 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 a single dose of bull sperm, for which it may be necessary to adjust their timing of the onset of hunting. Individuals that are planned to be inseminated should be examined every 2 weeks. If necessary, you need to revise the diet and improve the nutrition of animals, because the general fatness affects the functionality of the reproductive system, the manifestation of hunting and its duration.

Due to insufficiently good nutrition in cows, the process of maturation of follicles is disrupted, they are covered poorly. The same is observed in obese animals, their duration of estrus is shortened.

Cows with which they keep calves may also have problems with a normal reproductive cycle.To improve the results of fertilization, it is necessary to synchronize the heat. 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. Especially valuable during this period is vitamin E, which regulates reproductive function. The lack of a substance in the feed directly affects the performance of the system. Such cows need to be covered no earlier than 2 months after calving.

Why there are false hunts

It happens that after a cow has been inseminated, she again shows all the signs of hunting, and she happens again. Pregnancy occurs, 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 the low level of progesterone, which is not enough in the cow's body.It is excreted from the body with milk. False hunting can be determined by performing an ultrasound of the ovaries. Insufficient progesterone not only contributes to the occurrence of false heat, but it also increases the number of embryo deaths.

Low body condition also causes false heat in cows with high milk yields. A lot of nutrients and energy are spent on milk production, which the animal's body does not have time to replenish. There are changes in metabolism and hormonal levels, inhibition of follicles and delayed ovulation. The corpus luteum is formed from the follicles, which synthesizes progesterone.

In milking individuals, this condition can be caused by overheating stress. During stress, the body produces the hormone cortisol, in parallel, the production of oxytocin, as well as gonadotropic hormones, decreases. As a result, there is a violation of the genesis of follicles, ovulation processes. The signs of estrus become less intense.

Abortions are possible in pregnant women.You can return the animals to a normal state if you cool the room with water or ventilation. The correct determination of the time 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 you manage to choose the right moment, 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 more profit. Yes, it matters in the home as well. If you know how to determine the right time, it will be enough to mate once, and not several in a row.