Pregnancy deer began to give birth in early May. The ability of a female deer to live a healthy and healthy life after giving birth or a deer is directly related to the development of deer herds and the economic benefits of deer conservation. Therefore, the number of days of pregnancy of her deer can be determined. And calculating the date of the deer's calving, it is of great significance for the preparation of prenatal preparations, the timely observation of the deer's prenatal performance and the birthing process, and the care for the postpartum deer. There are several.
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The length of the antler's gestation period is related to the type and type of velvet deer, the number of the fetus's sex, the age of the deer, the feeding method, and nutrition. The sika deer's gestation period is 2296 days; the Huaigong Lamb is 2315 days, an average of 3 days longer than the 2286 days when the Huaimu Lamb, 2246 days when the twins are pregnant, 5 days shorter than the single-child's birth, and the first child is strong. Deer gestation period is shorter, older deer is longer, but the difference in the number of days of pregnancy between the first and the 10th is not obvious. The gestation period of the northeastern red deer was 2436 days, and the Tianshan red deer was 2447 days. The descendant (F1 generation) of the northeast deer deer and the northeast red deer crossed was 2257 days, which was a cross between the northeast deer and the northeast red deer. The offspring (F1 generation) had significantly less 15 days in 2407 days, and the F1 generation of the fancy hybrids had a gestation period of 2185 days, which was significantly less than 7 days in 2257 days when a single child was born.
It is not difficult to calculate the expected date of the deer, as long as the date of matching is recorded accurately, the expected date of production can be calculated. The deduction formula for the deer's expected date of birth is:
(1) Month minus 5, day plus 23, if the value after day 23 is greater than 30, after the calculation, the day will be reduced by 30 months, and the remainder will be the number of days after birth. For example, the doe that mated on October 13 will have a due date of June [(10-5)+1] 6 days [(13+23)-30] of the following year.
(2) month minus 4, day minus 12, or day minus 11 (Huaigong lamb, or daily minus 14 (Baaimu). The formula for deferred delivery of red deer is: month minus 4, day plus 1 (Northeast red deer) , Or day 2 (Tianshan red deer.) Using the above calculation formula to predict the accuracy of the expected date of up to 90%.