Ensuring light increase litter size

At present, the breeding of various water bream farms in our province has basically ended. After the end of breeding, there were many days of cloudy days, rain, and snow, which caused some unfavorable factors for pregnant and litter of leeches. The keeper needed to take corresponding management measures, and in addition to strengthening the normal feeding and management work, it also increased. Illumination time allows the embryonic blastocyst to develop at an early stage.

The entire period of pregnancy can be roughly divided into three stages.

The first stage is the period of blastocyst formation. From the end of breeding until the fertilized egg enters the uterine horn, the leeches generally begin 6 to 8 days later. The fertilized eggs begin to divide after fertilization in the fallopian tubes of the female pupa and form blastocysts.

The second stage is the blastocyst implantation period. After mating and ovulation, mother quail can not form the corpus luteum needed for pregnancy immediately. After the formation of blastocyst, it enters the uterine horn. Generally, it cannot be implanted immediately but is in a free state. This period is the incubation period of pregnancy. The time difference between individuals is larger, the shortest one day, the longest up to 46 days, and the majority of females is about 17 days. The length of pregnancy is determined by this period.

During this period, the blastocyst is neither implanted nor developed, but is in a free state and is vulnerable to death due to environmental factors in vivo and in vitro. The longer the delay of implantation, the higher the probability of death, and the number of litters will be reduced or even empty. According to the author's many years of observation, the factors affecting the implantation of the blastocyst were found to be various, such as weak mother-in-law, poor body condition, some illnesses or genetic factors, and others due to poor management of breeding. When the above factors are all normal, the length of the illumination time has the greatest influence on the blastocyst implantation time, because after the breeding is completed, the mother lice are very sensitive to the length of the light, the mating end of the early mother cricket, if there is cloudy and rain and snow The weather reduces the daytime light, and less than 12 hours, it will extend the implantation time of the blastocyst, but most of the market ignored this important issue, resulting in a lot of empty, little litter size. At this time, the open field can be used in the morning and night to turn on the lights in the shed to supplement the light time, so that the blastocyst can be implanted on time.

The third stage is the development of the fetus. From embryo implantation to fetal development, it enters the fetal development period. This period of time is generally about 30 days. The otters are multiple birth animals. The majority of mother cubs can produce 5 to 8 eggs per fetus and can produce up to 10 or more eggs. The fetus develops quickly. In addition to the nutrients it needs, the mother-in-law also needs the growth and development of the fetus. It also lays the foundation for the birth and breast-feeding. Therefore, this stage must be carefully managed to improve nutrition. In order to avoid improper feeding and management, the development of the fetus is blocked, or the occurrence of absorption, miscarriage, weak birth, and post-partum alacrity occurs. To ensure the normal development of the fetus, proletarians survive more often, and the breeding staff must strengthen feeding and management to provide palatability. Good, with a reasonable full price nutrient feed.

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