-
About Qingfeng
-
-
-
Shandong Qingfeng | Several Aspects of Cow Breeding Control
Release time:
2022-03-07
The main nutrients needed by cows include energy, protein, minerals and vitamins. Copper, manganese, selenium, cobalt, iodine and other minerals are closely related to fecundity. Won the EU Green Free Sales Certificate Won the double organic certification Queen of England Award Wins Enterprise Improve the health index of dairy cows and reduce the incidence of disease. Relieve heat stress Solve pica and prevent the placenta from falling enhance reproductive ability effectively prolong the peak period of lactation Improve feed conversion rate
1 The cow itself.
When selecting, first look at the reproductive performance of the ancestors, and then make a comprehensive review of their own reproductive performance. For bulls, mainly testicles, epididymis, penis and foreskin, sexual occurrence time, sexual behavior sequence, ejaculation volume, sperm density and vitality, for cows should pay attention to sexual maturity, estrus and ovulation, conception ability. Regardless of male or female cattle, individuals with genetic defects should be strictly eliminated. The fecundity index of dairy cattle is that the matching rate is greater.70%, the conception rate is greater80%, the calving (survival) rate is greater90%, the total conception rate is greater95%, the number of mating times required for individual conception is less1.6times, the calving interval is less13months, individuals with reproductive disorders were less10%in the herd.70%The above individual in postpartum60Begin to estrus within days.
The medium fat condition of cows is beneficial to improve the conception rate. Production should be based on the variety, physiological stage and production performance and other conditions of a reasonable mix of feed to meet the nutritional needs. The main nutrients needed by cows include energy, protein, minerals and vitamins. If the energy and protein are insufficient, the young cattle grow slowly, the initial period and the adaptation age are delayed, the conception rate is reduced, the weight loss during pregnancy is reduced, the calf's birth weight is small, the growth is slow, and the disease resistance is weak. Calcium deficiency mainly affects bones, postpartum paralysis, decreased lactation. Insufficient phosphorus intake affects the utilization of energy, resulting in delayed initial period, only ovulation without estrus, and even affects the cycle to stop. At the same time, the conception rate is low, childbirth is difficult, and weak fetus and stillbirth are produced. The normal ratio of calcium to phosphorus in the diet is2∶1. VitaminsAVitaminsEZinc, copper, manganese, selenium, cobalt, iodine and fecundity is very close, such as the nutritional level is too high, will also cause adverse consequences.
Won the EU Green Free Sales Certificate
Won the double organic certification
Queen of England Award Wins Enterprise
Improve the health index of dairy cows and reduce the incidence of disease.
Relieve heat stress
Solve pica and prevent the placenta from falling
enhance reproductive ability
effectively prolong the peak period of lactation
Improve feed conversion rate
Shandong QingfengFocus on rumination
In addition, the use of Chinese medicine in the spleen and kidney, warm palace dispelling cold principle can also improve the conception rate of cows. The fertilization rate of cows after mating was70%~80%, but the final calving rate is only50%This is due to the high mortality of early embryos. The causes include lethal genes, abnormal sperm, abnormal eggs, hormone disorders, uterine disorders and feeding management. Therefore, we should pay special attention to the selection of bulls, including semen and cows, strengthen the management of early and late pregnancy, and use drugs to treat the luteal phase of cows with habitual abortion, and eliminate them if necessary.
2 estrus control
Induced estrus is a method of using exogenous hormones or other methods to cause normal estrus and mating reproduction in cows during the period of lack of estrus. Gonadotropin is commonly used, suchFSH, luteinizing hormone (LH），PMSG,HCGprogesterone, estrogen, prostaglandin, etc.
Synchronous estrus, that is, synchronous estrus or control estrus technology, is the use of certain hormone preparations to artificially control and adjust a number of (donor and recipient) cows to concentrate estrus within a certain period of time, which can be fertilized at the same time within a predetermined period of time without estrus examination. Estrus synchronization is not only of great significance to the application and promotion of artificial insemination technology and frozen semen technology, but also an essential part of embryo transfer.
There are two ways to control the corpus luteum to extend or shorten its life, reduce the level of progesterone, make the cow get rid of progesterone control time, resulting in the development of follicles at the same time, to achieve the purpose of estrus.
3 ovulation control
Ovulation induction is when the ovary has mature follicles, before the performance of estrus behavior, (using exogenous ovulation-stimulating hormone to induce mature follicles to rupture and discharge eggs in advance. Therefore, ovulation induction must master two: one is mature follicles; two is the hormone processing time must be earlier than the endogenous luteinizing hormone peak time.
The induction of twin production is the use of gonadotropins to treat the female animal to cause multiple follicles to mature and ovulate to produce twins or multiple births. This method is currently used in beef cattle and sheep, there are still many problems to be solved.
Superovulation refers to the treatment of cows with gonadotropins at the appropriate time of the cow's estrous cycle, so that the ovaries have more follicles than in natural conditions and more eggs with insemination capacity are discharged. The application of superovulation technology can give full play to the role of excellent mother (donor) cattle, accelerate the improvement of cattle herd, and is also another important link of embryo transfer.
4 mating
Estrus identification is a prerequisite for timely mating, which can greatly improve the conception rate. The duration of estrus in cows is short, and ovulation is after the end of estrus. In practice, people have summed up three experiences: first, look at the appearance, the amount of mucus, transparency and traction; Second, touch the ovarian follicle development size, bubble wall thickness thin, tension and wave. Three mating, according to see, touch the information, comprehensive judgment of ovulation time, so as to determine the mating time. Any congenital, can only be eliminated. For those who are acquired infertility, it is necessary to strengthen the feeding and management of these cattle, appropriately improve the nutritional level, rationally lactation or servitude, and slow down stress (especially high temperature). At the same time with the use of hormone aphrodisiac. Follicle-stimulating hormone (FSH）200~300International Units, Interval1~2Day, intramuscular injection2~3Times. Chorionic Gonadotropin (HCG）1 000~1 500International Units, Interval1~2day intramuscular injection1~2Times. Pregnant Horse Serum (PMSG）10ml, or1 000International Units, Interval6day intramuscular injection2Times. The bulls used in this exchange must be identified, and bulls with poor semen quality and reproductive obstacles must be eliminated. If frozen semen is used, it must meet national standards.
Share
Telephone:+86-0531-8712 3999 +86-151 6919 5199
Address of Marketing Department: Energy Saving Demonstration Building, Wolong Road, downtown Jinan City
Message feedback