Dairy cow breeding is one of the most difficult techniques for dairy farming. The best method of breeding is artificial insemination. The use of fine frozen bulls is beneficial to improve the genetic progress of dairy cows and produce high-quality offspring. Artificial insemination uses an artificial insemination gun to input high quality bull semen into the deep cervix of the cow, the uterus, the ovulation side or the ovulation side uterine horn. Common is the deep neck (the end of the cervix) insemination, and the use of the sperm is the key to the breeding and breeding of cows. The following is a summary of the problems and rescue measures that may be encountered during the use of artificial insemination guns
(1) Artificial insemination gun is blocked in the vagina of the cow
The reason for this is either the wrong way of inserting the gun or the wrong angle of the inserted gun, or the vaginal wall wrinkles caused by the vaginal contraction, which causes the artificial insemination device not to be smoothly inserted into the cervix, resulting in inability to breed.
We can adjust the angle of the inserted gun appropriately, enter the vulva at an angle of 45°, and then gently push it parallel to the rectum into the deep part of the vagina until the cervix. If the vaginal wall folds due to vaginal contraction, in order to avoid damage to the vaginal wall, you can not continue to force the top, you can retreat the artificial insemination gun a little, and then push forward again. Or use the hand placed in the rectum, touch the place where the artificial insemination equipment is held, then lift the top of the vaginal wall by the rectal wall and lift it up. Remove the top of the artificial insemination gun and cover it by the vaginal wall. The insemination gun went straight forward. You can also directly grasp the cervix and push it inward to extend the vaginal wall. At this time, the wrinkle tendency of the vaginal wall can be alleviated.
(2) The artificial insemination gun is difficult to enter the cow's cervix
The main reason for this in the cervix is: improper positioning of the cervix or improper insertion of the gun. When the position of the cervix is too far forward, the cervical port will face downward. The top of the artificial insemination gun will be placed on the upper edge of the cervix, causing the artificial insemination device to enter the cervix and not insemination. Although the cervix is properly grasped, the insemination gun reaches the cervix and cannot enter the cervix directly. Blindly use artificial insemination equipment to find the cervix mouth up and down, so that the length of time will often cause rectal blame, rectal cavity, resulting in tight rectal wall and not conducive to breeding operations.
The correct method of breeding is that after the artificial insemination gun reaches the cervix, the gunman should not swing, but rely on the hand grasping the cervix, and use the cervix to set the insemination gun. Then the gunman can gently push in along the inner tube of the cervix, and then enter the uterus and then insemination. This kind of operation not only increases the breeding speed but also ensures safety.
(3) Artificial insemination gun is blocked in the cervix
When breeding, it is often encountered that the insemination is not easy to pass through the cervix and affect normal insemination. The possible reasons for this situation are: the cow has had a history of dystocia; the cervical injury caused by improper operation; the cervix of the cow is too thin or the cervical deformity.
Generally speaking, when there is estrus, there will be estrus secretion and the insemination gun can pass the normal insemination of the cervix. Dystocia or inadvertent operation can cause cervical damage, resulting in scars in the inner cervical canal, which makes the inner cervical canal become curved and narrow. The bred cervix itself is relatively thin, and some of the cervix is slightly deformed, which makes the gun not smooth. To improve the technical ability in this area, we must first formalize the gun and have patience. Don't worry if you encounter a difficult gun. The more you work hard, the more you want, the more you can't reach it, and it's very easy to cause new trauma, making it more difficult to breed later. You should set your mind, carefully ponder where the gun is blocked, and then adjust the posture of the cervix. Instead of grasping it, use three fingers to pinch the blocked position, gradually adjust the position of the gun, and slowly move in step by step. As long as you have patience, you will eventually get in.
(4) Artificial insemination gun can only enter one side of the uterine horn
Many breeders have higher requirements for breeding and are bred at the uterine horn of the cow. The uterus of a normal cow should be the cervix that connects the uterus and communicates with the two uterine horns. The uterine horns of individual cows are irrelevant. There is a cervical passage in each uterine horn. This is also a form of reproductive system malformation, which is called "double cervix." In this case, the uterine horn on one side is easy to insert into the artificial insemination gun, while the uterine horn on the other side is difficult to insert, and even if it enters, the insemination gun cannot be turned to the other side of the uterine horn.
Judging whether a cow has a double cervix can be judged according to the shape of the cervix: a cow with a double cervix whose cervix is not round but elliptical. The middle part of the cervix is harder than the two sides, and there is no obvious boundary between the connected uterus. It feels directly connected to the two uterine horns along the cervix, and there is no swelling or soft part of the uterus. After the discrimination, it can not follow the conventional method of insemination, and should follow the following specific operations: First, determine which side of the uterus is actually on the insemination site. Then look for the lumen leading to the cervix here, grasp the cervix to set the artificial insemination gun, carefully enter and then carry out the insemination operation. Note that at this time, the insemination gun cannot be used to disorderly lick the cervix. This will not only fail to insert smoothly, but will also hurt the cervix and affect future breeding and reproduction. In such cases, it is often easier to insert the cervix on one side and the other side. Once you insert the wrong side of the uterine horn, you must exit the re-adjustment position, otherwise you will not be able to conceive.
(5) The artificial insemination gun can only enter the vaginal opening 5-8cm
This happens in the first-time breeding cattle. Apparently, this kind of bred cattle is no different from normal bred cattle, and there is no significant difference in estrus performance. However, if you look closely, you will find that there is no secretion in the estrus, and you will not see the bleeding after the estrus. The direct inspection of the cow will reveal the following situation: the inside of the vagina is like a balloon, which is lightly touched and has a liquid sensation inside. The cervix is sometimes blurred, there is no obvious cylindrical cervix, and it is impossible to grasp. However, the uterus angle is clear and the ovary develops normally. With an artificial insemination gun, the insemination gun can only enter the vagina 5-8cm, and the front end of the insemination gun will be blocked. Sometimes, due to the large angle of insertion of the insemination gun, the urethra is mistaken, causing the cow to turm and injuring the insemination personnel. A vaginal examination by hand will touch a layer of film 8-10 cm away from the vulva. The film seals the vagina, causing the insemination gun to not enter the deep part of the vagina, causing the cattle to be unable to breed.
After the symptoms are determined, the correction method is relatively simple and easy to operate. Under normal circumstances, it is not necessary to use other surgical instruments, no need to ensure, only blunt expansion or freehand operation. The specific method of operation is to clean and disinfect the cow vulva before surgery. The operator's arm is cleaned and disinfected. If possible, wear medical short arm gloves and apply a lubricant such as soap, paraffin oil or iodophor. During the operation, the fingers slowly extend into the vagina. When a layer of film is touched, force the top slowly until the film is completely broken. At this time, a very small amount of blood will seep out, and at the same time, a large amount of blood will flow out. These congestions are mainly caused by the secretions from the previous estrus and the bleeding after the estrus is not properly discharged. Postoperatively, vaginal washing with rivanol or potassium permanganate solution is used to purify the vagina to prevent the formation of uterine inflammation caused by wounds and deposits in the uterus during wound infection and estrus breeding. As long as the diagnosis is correct and properly handled, it will not cause adverse consequences for the cattle. Of course, if the technology is mature, the device can also be used for surgical expansion, but care must be taken to avoid damage to other tissues and adverse consequences.