How is the due date of a cow calculated?

The expected date of delivery of dairy cows is about 280 days, and the calculation method is: monthly minus 3, daily plus 6.

For example, if the breeding date is May 1st, then the expected date of delivery is (5-3=) February, (1+6)=7.

What if the month is less than 3 and not enough to minus? That plus 12 and then minus.

If the day is greater than 24, what should I do if I add more than 30? Then minus another 30 will do.

For example, if the mating date is February 27, then the expected date of delivery is (2+12-3=) November, and (27+6-30=)3 days.

Summary. Kiss! It is normal for a seven-day cow to exceed the due date by 7 days, and if it is too late, it needs to be injected to induce labor.

The cow has not yet given birth when it is ready to give birth, probably because the calf develops slowly and stays in the womb for a longer time. Generally, the pregnancy time of a cow is about 285 days, and after successful mating, the pregnancy lasts about 10 months from the beginning of the formation of the fertilized egg to the end of farrowing. If the cow is about 290 days pregnant, then it is necessary to determine whether it has delayed delivery for some reason, and if it has not given birth to a calf after seven days, then it needs to be given an induced injection.

Kiss and shoot the ants! It is normal for a seven-day cow to exceed the due date by 7 days, and if it is too late, it needs to be injected to induce labor. The cow has not yet given birth when it is ready to give birth, probably because the calf develops slowly and stays in the womb for a longer time.

Generally, the pregnancy time of a cow is about 285 days, and after successful mating, the pregnancy lasts about 10 months from the beginning of the formation of the fertilized egg to the end of farrowing. If the cow is about 290 days pregnant, then it needs to be judged whether it has delayed delivery for some reason, and if the birth has not been born for seven days, Wushi then needs to give it an inducing injection.

Is it normal for a cow to be past the bringing-up period?

Kiss! If you encounter such a situation, you should go to Yehan in time to find a veterinarian to see what causes the spine to know the cow's dystocia, and let the veterinarian give induced labor ** or in vitro correction of the fetal position to make it successfully complete the production process.

Under normal circumstances, the expected farrowing date of the cow is generally about 280 days, and the cow that exceeds the expected farrowing period can be regarded as an overdue delivery, and its overdue time can generally be between 7-10 days, if it exceeds 10 days, there may be cattle health problems, and it is best to give timely management and inspection.

Due to the breed, nutrition, age, and sex of the fetus, the length of gestation varies to a certain extent.

Generally, it is mostly 270-285 days, and the average is about 283 days.

Early maturing breeds, good nutritional level of pregnant cows, prime-aged cows, pregnant female fetuses, etc., have a slightly shorter gestation period, and vice versa, a slightly longer gestation period.

It is calculated as follows:

1. Formula calculation method.

1) Press "minus 3 from the breeding month, plus 6 from the breeding date".

2) If the breeding month is not enough in January, February and March, it must be borrowed for 1 year (plus 12 months) and then reduced.

3) If the breeding date is added to 6, the number of days exceeds 1 month, and the remainder is moved to the next month after subtracting the number of days in this month.

Here are two examples:

Example 1: Cattle No. 1 was bred and conceived on May 1, 2014, and the expected date of delivery of the cow was calculated.

Follow the above formula:

Number of months: 5-3 = 2 (months) Number of days: 1 + 6 = 7 (days) The expected date of delivery of the cattle is February 7, 2014.

Example 2: Cattle No. 2 was bred and conceived on February 28, 2014, and the expected date of delivery of the cow was calculated.

Follow the above formula:

Number of months: 2 +12-3 = 11 (months) Number of days: 28 + 6 = 34 (days) minus the 30 days of November, that is, 34-30 = 4 (days), and then add 1 to the month, that is, 11 + 1 = 12 (months) Therefore, the due date of the cow is December 4, 2014.

2. Look-up table method.

In production practice, in order to reduce cumbersome calculations, the expected date of delivery of cows is often formulated into a cow gestation calendar, and the expected date of delivery of cows can be found according to the date of breeding.

Using the cow gestation calendar, the mating date in the table can be checked to know the cow delivery date.

As follows:

Monthly minus 3, daily plus 10.

That is, the mating month is minus 3, and the mating day is added by 10.

If the breeding month is in the month, it is not enough to subtract, you need to borrow 1 year (plus 12) and subtract, if the breeding day is added to 10, the number of days exceeds 1 month, subtract the number of days in this month, and the remainder is moved to the next month to calculate.

For example:Cattle No. 1 was bred and conceived on June 3, 2017.

Expected is: Month: 6-3=3.

Day: 3+10=13.

That is, the expected date of delivery is March 13, 2018.

Cattle No. 2 was bred and conceived on February 27, 2018.

The expected is: month: 2+12-3=11.

Day: 27 + 10 = 37.

Subtract the 30 days of November, i.e. (37-30) = 7 (days). Add the month again, i.e. 11+1=12 (month).

That is, the expected date of delivery is: December 7, 2018.

Cattle No. 3 was bred and conceived on June 28, 2018.

Expected is: Month: 6-3=3.

Day: 28+10=38.

Subtract the 31 days in March, i.e. 38-31 = 7 (days). Add the month again, i.e. 3+1=4 (month).

That is, the expected date of delivery is: April 7, 2019.