The breeding performance of cattle is one of the most important economic traits in a breeding farm. Many cattle are singletons, and the double-head rate is less than 3%, so the reproductive efficiency of the group is even more important. The following indicators are commonly used to measure the breeding performance of herds:
1, by the allocation rate
The acceptance rate of a region's cattle indicates that the number of cows participating in breeding in that region (or group) accounted for several hundred percent of all breeders in the region (group) within one year. This can reflect the estrus, breeding, and management of breeding cows in this area (group). The formula for the formula rate is:
Acceptance rate = (number of cows in the year and number of cows per year/year number of cows in the memory column) 100%
2, conception rate
(1) Percentage of total fertilization rate Percentage of fetal cows per head in the number of breeding cows in one year. This indicator reflects the status of abortion of the herd and can be used to measure the completion of the mating plan within the year.
Total pregnancy rate = (number of fetuses in the year / total number of breeding cows during the year) 100%
(2) Emotional conception rate Within a certain period of time (usually calculated on an annual basis), the number of fetuses involved in the total number of mating cows during the period is the percentage. The conception cow has at least one affection period, and some cows may have few affections and have no conception. The previous bull period was 1, and the later bull was counted on a few occasions and accumulated cumulatively to find the total number of periods.
Emotional conception rate = (number of fetal cows / total number of breeding cattle within a certain period of time) 100%
(3) The first insemination period fertility rate indicates the percentage of cows born to the first breeding on the first breeding period. This indicator reflects the energies of bull semen and the reproductive management of cows.
The first insemination period conception rate = (first affection fetal cow number / total number of first materiel cows) 100%
3, no return rate
The non-reversion rate refers to the percentage of cows that no longer estrus within a certain period of time after the allocation and the total number of cows that are in the period. The non-return rate can be divided into 30 days, 60 days, 90 days, and 120 days without return. The longer the term, the closer the ratio will be to the actual conception rate (years).
X days non-return rate = (no more estrus cows after X days of breeding/number of breeding cows within X days of breeding) 100%
4, breeding index
The mating index refers to the average number of breedings each cow needs for fetusing. If the breeding index exceeds 2, it means that the breeding work is not done well.
Breeding index = (total number of maternal breeds/pregnant cows) 100%
5, production rate
The percentage of cows delivered was the percentage of pregnant cows.
Pupulation rate = (number of calving cows / total number of pregnant cows) 100%
6, production index
The calving index, also known as the calving interval or the average fetal interval, is the time interval between two successive calvings of the cow, expressed as the average number of days, and is a comprehensive indicator of herd fertility.
The calving index (the calving interval) = the total number of days between each calving for each cow/the total calving interval within the calculation
7. Yak survival rate
The survival rate of yak indicates that the percentage of calves that survived at 3 months after birth accounted for the percentage of live calves. It can be seen that the yak cultivation results.
The survival rate of yak = (number of yak survival in 3 months after birth / total number of live yak in cattle) 100%
8, reproductive survival rate
Reproductive survival rate refers to the percentage of calves that survive weaning in the current year to the total number of appropriate breeding cows in this year's herd. This is a reflection of the total efficiency, and sometimes it is called the breeding efficiency of the herd.
Breeding survival rate = (total number of weaned calves in the year / number of breeders in the year) 100%
Split Drape,U Split Drape,U Shape Drape,Surgical Split Drape
Xinxiang Huaxi Sanitary Materials Co., Ltd. , https://www.huaximedical.com