How to choose a reserve cow?
2021-01-12
Needless to say the importance of reserve cows here, so when selecting reserve cows, we must choose high-quality breeding cows. The specific selection method is introduced here as follows. In addition, the cow is also very important during the breeding period, especially the breeding method and time.
Selection method of reserve cow
1. Choose heifers produced by cows with tall body, strong body, disease-free, fast growth, and high calving rate.
2. Choose female yellow cattle with an age of 1 to 1.5 years and a weight of 80-150kg and female water buffalo with a weight of 150-200kg.
3. Choose a heifer that is docile, easy to approach, and tamable.
4. Choose a heifer with a tall forequarter, short hindquarters and hips, full muscles, and a wide chest.
5. Choose a cow with flexible and energetic eyes, round and bulging eyes, thin and active ears, large nostrils without mucus, bright red mouth with little mucus in the mouth, thin and powerful teeth, thick tongue, and delicate neck.
6. Choose cows with strong feet, strong walking, bright hoof shells, and strong farming.
7. Choose cows with long and flexible tails that can repel mosquitoes and flies.
8. Choose heifers with better udders.
9. Choose a heifer with a second or third birth, with a big belly.
Cow breeding method
1. How to breed cows
There are generally two kinds. The first is the more common natural mating. The fertilization rate of natural mating is relatively high. Just let the cows and bulls mate autonomously. There is no need to conduct estrus identification for the cows, but it is impossible to prevent reproductive tract diseases. . Then it is the same method as natural mating for artificial assisted mating. The main reason is that when the size difference between males and females is too large, and when the bulls cannot mate with the cows normally, then humans are needed to assist males and females in breeding.
The second type is artificial insemination. Artificial insemination must first collect bull semen. After careful inspection, freezing and thawing, it is imported into the reproductive tract of cows that are in heat. When checking and freezing semen, keep a fast speed and control it to about 10 seconds. The lid of the container should be covered in time to avoid evaporation of liquid nitrogen or other substances entering to reduce the quality of semen. Then put a protective cover around the container and pay more attention when handling it to ensure that it is stable and does not vibrate, and cannot be exposed to the sun. If transport is required, liquid nitrogen should be refilled regularly to avoid damage to the container, resulting in a decrease in semen quality.
2. Mating time
Heifers will gradually begin their first heat at the age of six months to one year. At this time, the cow's estrus period is relatively short, and there is no periodic pattern. Because the reproductive system and body functions of heifers are not yet mature, they are not suitable for hair quality. Generally, the sexual maturity of male and female cows is about one year. Although they have fertility, because male and female cows are also in the peak period of development at this time, if they are bred, it will affect their later growth and reproduction ability. As a result, the breeding period is shortened and the vitality and production performance are reduced, so it is not suitable for breeding at this time.
The mating time of the cow is determined according to the time of maturity. Under normal circumstances, whether it is a bull or a cow, it will be completed when it is 3 years old, and it has entered the maturity period, and then mating can begin at this time. However, the mating age still depends on the species. For example, domestic female cattle are bred around 1.5 years old, while males are around 2 years old. Good hybrids are mainly at 1.5 years old, depending on the growth of the cattle.
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