Variety reason
Some breeds have low reproductive capacity and cause fewer litters. Such as: Pietrain, Duroc, etc., due to the variety of reasons, raising the number of litter is very difficult, in the process of maternal breeding of commercial pig production, can not only pay attention to the pig's body type and lean percentage, and neglected the reproductive ability, Try to avoid the blood of breeds with few litters. It is recommended to choose Landrace or Great White.
Age reasons
The age and parity of the pigs affect the number of litters and at the same time the number of live pigs. The reproductive performance of sows with 1 to 2 children is low, the number of ovulation is small, and the number of litters is small; the reproductive performance of 3 to 5 children is the best, the number of births and the number of live births is the highest, and the mothers after 6 to 7 months of birth are the mothers. The reproductive performance of pigs has declined, and the number of litters and the number of live piglets have decreased. Due to physical effects, the litter process is prone to fatigue and takes too much time, resulting in an excessive proportion of stillbirths. The low births and heights should be strengthened during production. Fetal delivery of midwifery pigs, reducing the interval between farrowing.
Reason for feeding
There is no nutritious, full-priced compound feed for sows: Some producers believe that sows do not use or use additives to avoid causing sows to become obese, which is incorrect and must be corrected.
Feeding mildewed feed ingredients: The mycotoxins in the corn exceed the standards, the urease in the soybean meal is high, and the quality of the bran is not valued. The sow's ability to digest the minerals is not strong, causing the calcium and phosphorus to be absorbed and the fluorine content exceeding the standard. Both affect the number of sows born and the number of live births.
Management issues
Pre-species management: gilts are underweight and their monthly age is too small. Due to the fact that pig breeds are growing too fast, the mating is too early to reach sexual maturity and the number of litters is reduced. The maternal age of gilts should be more than 7 months old and weigh about 120 kg.
There was no control over the pre-species bred condition: the gilts did not limit feeding, resulting in overweight and overweight at the time of mating, and the number of litters decreased. Basal sows that are too thin after weaning, abortion, and returning sows are over-fatated, affecting sows’ ovulation numbers and affecting litter size.
There is no short-term excellent feeding before mating: In order to increase the number of ovulation, the gilts are mated for 3 weeks to 4 weeks before mating, and the weaned sows are given short-term excellent feeding after weaning, feeding high-quality full-priced feed, and increasing the amount of feeding to increase the number of ovulation.
Unreasonable feeding during pregnancy: 2 kg per day during the first trimester, moderate amount in the middle, 2 kg to 2.5 kg per day, 3 kg to 3.5 kg per day at the end of the day, and at the same time, depending on the individual condition of the sow Feeding amount.
Stress in the sow is too large: such as whipping, scaring, fighting, sudden changes in climate, cold and heat stress, etc., can all result in a decrease in the number of fetuses.
Conical culture flask (referred to as shake flask) is an ideal choice for medium configuration, mixing, and storage, which is mainly used to cultivate cytoplasm to oxygen-demand, which can also be used to cultivate bacteria, fungi, and plant cells in suspensions.
The shake flask is made of medical grade PETG, which is in line with the requirements of contact management requirements to avoid bisphenol A;
Products are made of independent vacuum packaging, easy to use, avoid cross-infection;
Bottle body seam,
One-time blow molding, avoiding surface scratches or cell hit crackers;
The surface finish reaches the mirror requirements, and the permeability is close to the glass, which reduces the risk of cellular wall;
The bottle mouth is in line with the international SBS standard, suitable for the shortcut connection of the bioreactor;
Using electron beam sterilization, SAL = 10, ensures ⽆ DNase / RNASE, no thermal, non-toxin.
It is equipped with 0.2 ㎛ ㎛ ⽓, can better mix the cells and culture fluid, increase the empty transmittance, so that the cells can be longer to more density.
5L culture bottle handle design for easy design, avoiding the risk of pollution during the use of the bottle mouth during use
2.8L Cultivate the bottom optimization of the bottle, saving usage space, greatly improving the usage rate of shaker, reducing customer development and production costs
Bottle of â¾ uses the extrusion process technology, the bottle is smooth, and the cellular wall and culture liquid are reduced.
Adding electron beam irradiated, sterile independent packaging is convenient.
Glass Conical Flask,Multi Size Glass Conical Flask,Laboratory Glass Conical Flask,Laboratory Multi Size Conical Flask
Jiangsu iiLO Biotechnology Co., Ltd. , https://www.iilogene.com