After mating, in order to timely determine if the sow is pregnant, the time of pregnancy, and the abnormal condition of the fetus and reproductive organs, clinical and laboratory methods are used to check, and the diagnosis is referred to as rape. Pregnancy diagnosis of sows is an important technical measure in the breeding work of pigs. The methods of pregnancy diagnosis include appearance observation method, hormone diagnosis method, chemical determination method and ultrasonic measurement method.
(I) Pregnancy diagnosis
1. The estrus cycle of the sow observation method was an average of 21 days. If after 21 days, the sow does not continue her estrus, it can be inferred that the sow has been pregnant. After 42 days she is observed again. Her estrus performance is still absent, indicating that she has already been pregnant: her external appearance is: increased appetite, mediocre temperament, and bright, shiny coat. Be cautious and secure. After 2.5 months of pregnancy, the pig is on the right side or the last two pairs of breasts! The abdominal wall of the party can be palpated to the fetus.
2. After estrus induction test was performed, 1 mg of hexene andrew was injected 16 to 18 days after mating, and non-pregnant sows generally showed obvious estrus symptoms after 2 to 3 days. Pregnant pigs did not respond. Use this method to match time must be diagnosed accurately
3. Ultrasonic diagnostic ultrasound fetal heartbeat analyzer consists of a host and a probe. During the measurement, the probe was attached to the surface of the pig's abdomen (the penultimate right side of the nipple) and the ultrasonic wave was used to determine whether the sow was pregnant based on the fetal heartbeat sensing signal or the umbilical cord Doppler signal sound.
4. Estrogen assays increase oestrogen levels in the urine of pregnant sows after pregnancy. Exposure of progesterone to sulphuric acid produces green fluorescent compounds, which increase with prolonged gestation. The method of operation is to put sow urine skillfully in large test tubes, add concentrated sulfuric acid 5.111, warmed to 100°C, hold 10,nin, cooled to room temperature, add 15ml of benzene, add stopper and oscillate to separate hormone layer. Add 10, nl concentrated sulfuric acid, and then plug the oscillation, and heated to 80 °C, by 25.111., By fluorescent lamp observation, if there is fluorescence in the sulfuric acid layer, it is a positive reaction. 25-30 days after sow mating, every 100rnl of urine contains }ile]5 forest g, which is a positive reaction.
From the above methods, pregnancy diagnosis is based on a certain period of time after mating. Therefore, for a modern-scale pig farm, it is very important to keep a good record of breeding and reproduction. They are important for breeding management. According to the basis, we must do a good job in recording, preservation and organization of original data. II.
(B) Calculation of expected date of birth
Correct estimation of the sow's expected date of production is conducive to the breeder's preparation for production and production. The average sow's gestation period is 114. There are three general methods for estimating the expected date of birth, which are described below.
1. The "three, three, three" method of calculation is to add 3 months, 3 weeks and 3 days to the breeding date. If the date of mating of a sow is May 6, the expected date of the sow is 5+3=8)5j, 6+(3x7)+3=30 days, and the expected date of the sow is 30th of the month of s.
2. The method of "increment by four minus six" is to add 4 to the breeding month, and subtract 6 from the date. If the mating date of a sow is July 8, the method for estimating the expected date of the sow is: 7+4=11 ( Month), 8 - 6 = 2 (days), the sow's expected date of birth is November 2.
3. The method of "decrease by eight minus eight" is to subtract 8 from the breeding month to the month of childbirth, and subtract 8 from the day of breeding to the day of childbirth. Such as the sun and moon 25}" breeding, then the pre-production month is 11-8 = 3 (months), and the pre-production date is 25-8 = 17 (days), that is, the expected date of birth is March 17. If the mating date is less than or equal to 8 hours, then the old plus 30 after the first division, then reduced by 8, I Division in the distribution, the monthly I minus a few. Such as breeding on November 1, the pre-production date is 1 + 30 8 = 23, pre-production month! ! One 8 - 1 = 2 means delivery on February 23rd. If the mating month is less than or equal to 8 months, then add 8 and then subtract 8 from the breeding month. Such as breeding on May 24, the pre-production date is 24-8=16, and the pre-production month is 5+12-8=9, that is, the delivery on September 16th.
4. Checking the expected date of birth of this method is simple and easy, and it is applicable to large-scale pig farms (Table 3-8). For example, if a sow had three breedings in May, it was found in the first row of the table in May, and then another three in the first column on the left, and the 8.25 (August 25) at the intersection of the two sows was Delivery date.
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