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Method for sexual control of double fetuses of cows

A technology of cows and twins, applied in medical science, veterinary equipment, animal delivery, etc., can solve problems such as dystocia embryos, death, miscarriage, etc.

Inactive Publication Date: 2020-02-07
甘蔗
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The heritability of the economic trait of genetic selection of twins is very low, and it is very difficult to increase the rate of twins through genetic selection. People in the industry want to increase twins through genetic selection, but this attempt has not yet been successful; It is known that exogenous gonadotropins, such as PMSG (pregnant horse serum gonadotropin) and FSH (follicle-stimulating hormone), can be used to stimulate the development of multiple follicles on the ovary of cows and mature ovulation, fertilization and pregnancy; inhibin antiserum is also used to immunize Cow's
However, the use of hormones to achieve twins cannot be used on a large scale in production until a method to control the ovulation of one egg on each side of the ovary is found, because it often happens that one uterine horn has more than two embryos, and a bovine The lateral uterine horns are markedly resistant to maintaining more than one embryo, and bovine embryos are rarely able to migrate from one uterine horn to the other, in which case miscarriage, dystocia and embryonic death often occur

Method used

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Embodiment

[0030] Before the implementation of the method, it is best to thoroughly screen and purify the donor cows, breeding bulls, and recipient cows for diseases, such as brucellosis, tuberculosis, bustobacter, mycoplasma, rhinotracheitis, and foot-and-mouth disease, etc. Prevention of infectious diseases to ensure the application of the invention in a healthy and sustainable cattle herd.

[0031] 1. Handling of Donor Cows

[0032] Three key factors need to be considered when selecting a donor cow: 1) high-quality genetics; 2) strong reproductive ability; 3) good market prospects for offspring.

[0033] The first parity of large beef cattle is almost always facing dystocia. In order to reduce the dystocia rate, the best way is to delay the time of the first mating, and it is best to reach the first pregnancy after 20 months. Under good breeding conditions, generally virgin cows are born at 7 The first estrus begins at about one month, and then the estrus is repeated at intervals of ...

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Abstract

The invention discloses a method for sexual control of double fetuses of a cow. The method comprises the step of implanting an embryo with the same sex through embryo transplantation after 6 days of natural estrus fertilization of a receptor cow. According to the method, safe and sustainable excellent cows are additionally obtained under the condition that the feeding cost is not increased, and the improvement speed and the stock amount of improved cows in China can be greatly increased.

Description

technical field [0001] The invention relates to the technical field of mammalian reproduction, in particular to a method for sexually controlling twins in cows. Background technique [0002] Cattle are herbivorous singleton animals, and the twinning rate in the natural state is extremely low, only 0.15%-2.99%, and 91%-94% of female calves born with heterosexual twins are infertile. Cows pregnant with twins will improve reproductive efficiency and economic benefits of cattle breeding. Artificially inducing cows to produce twins can double the fecundity of cows and increase the number of commercial cattle. Since the 1930s, people have used genetic selection, drug induction, hormone immunity and other methods to try to increase the twinning rate of cows, and some progress has been made. [0003] The heritability of the economic trait of genetic selection of twins is very low, and it is very difficult to increase the rate of twins through genetic selection. People in the indust...

Claims

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Application Information

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IPC IPC(8): A61D19/04A61D19/02
CPCA61D19/04A61D19/02
Inventor 甘蔗甘甜
Owner 甘蔗
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