Breeding and breeding of dairy cows play a key role in the breeding of dairy cows. The detection of dairy cows with B-ultrasonic pass can determine whether it is suitable for the successful breeding and the infertility caused by some diseases. Take timely measures.

(1) Breed selection Breed selection is based on the required traits to select male and female cows for breeding. First, the identification criteria should be determined and then selected according to the requirements for the weight, appearance and production performance of each variety.
(2) After the selection of breeding cattle has passed the comprehensive identification of cattle with B-ultrasound, they must be selected. Only through matching can we guarantee good quality offspring. If an excellent bull mates with any cow without translation, it will not necessarily be able to obtain excellent offspring. If a reasonable selection is made, choosing a suitable bull for the cow can make up for some of its shortcomings, generation by generation. improve. The selection principle is as follows:

• Male and female cows with similar excellent characteristics should be mated, so that they can maintain and consolidate their original excellent traits, and can enhance or improve o
• Males and females with common shortcomings should not mate with each other, otherwise their shortcomings will be exacerbated in the offspring.
• Male and female cows of close blood relationship should generally not mate, so as to avoid the decline of the vitality of the offspring and the decline of productivity.
• When choosing a match, the general rating of bulls should be better than cows, and bulls that are worse than cows should never be used for mating, because this will degrade the herd.

• Pay attention to the age of male and female cows when choosing mating. Generally, young cows are required to be mated with mature or old bulls; old cows are mated with young or mature bulls.

(3) Breeding records In order to carry out breeding work correctly, it is important to establish a record system.

• Cards of males and cows containing pedigree, appearance identification, production performance, body size, weight, offspring status, etc.
• Breeding Bull Breeding Register Record the breeding status of breeding bulls.
• Cow breeding, pregnancy, maternity hall, calving record book Record cows’ estrus, breeding, pregnancy, calving, etc.
• Feed consumption statistics book, catalogue the types of trees and the amount of troublesome singing, etc.
• Calf Breeding Record Book Record the date of birth, number, sex, ancestry, birth weight, weaning weight, and weaning time of the calf.

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