Nutritional characteristics of pregnant sows
Nutritional characteristics of pregnant sows:
Pregnancy begins with mating and ends at childbirth. The goal of gestating sow feeding and management is to ensure the normal development of the fetus in the mother's body, prevent abortions and stillbirths, produce healthy piglets that have strong vitality and vitality, and also keep the sows at a medium and superior body condition. Pregnant sows control proper nutrition levels. China's feeding standards stipulate that when the weight of sows in the early pregnancy (80 days before pregnancy) is 90-120kg, the daily feed intake is 1.7kg, the weight is 120-150kg, the daily intake is 1.9kg, and the 150kg weight is more than 2kg. During the second trimester (one month before delivery), the body weights were 90-120 kg, 120-150 kg, and 150 kg, and the daily feed intake was 2.2 kg, 2.4 kg, and 2.5 kg of compound feed. Dietary nutrient levels ranged from 12% to 13% for crude protein, 2.8 to 3.0 Mcal/kg for digestion, 0.4% to 0.5% for lysine, 0.6% for calcium, and 0.5% for phosphorus. In addition, in addition to feed formula feed, in order to make sows have a sense of satiety and vitamin supplements, it is best with a variety of fine green feed or roughage.
According to the different characteristics of pregnant sows to take the appropriate feeding system and nutrition plan. For weaned sows after weaning, a feeding system and a nutrition plan were taken in between. Due to the fact that the sows after childbirth and lactation have a lot of physical exertion and are of poor constitution, in order to be better able to take on the tasks of breeding from the next stage, nutrition must be strengthened in the early stages of pregnancy, and the body condition can be rapidly restored. During this period (including the first 10 days of breeding, for a total of about one month), nutrition should be strengthened and supply of concentrates should be increased, especially for feeds containing high protein content. After the body condition was restored, the nutrition level was gradually reduced, and the animals were reared according to feeding standards. The main course was green roughage, and 80 days after pregnancy, supplemented with concentrated feeds was used to strengthen nutrition. Form a high-medium-high feeding system and nutrition plan, especially the later nutritional level should be higher than the previous period.
For the sows who are primiparous and those who are lactating, there is a step-by-step feeding plan. Especially for the primiparous sows, the body is still in the stage of growth and development, and the nutritional requirements are large, and it is more necessary to adopt this plan. Nursing sows have a heavy reproductive task and a large amount of nutrient requirements. Therefore, the nutritional level should be increased according to the weight of the fetus and reach the highest peak one month before delivery. In general, the early pregnancy can be lower in nutrient levels, mainly in roughage; then gradually increase the proportion of concentrates, especially the supply of protein and minerals, to improve the level of nutrition; to 3-5 days before delivery, the diet decreased by 10- 20% for normal childbirth.
For pre-mixed sows with good body condition, take a low-to-high nutrition plan. In the early stages of pregnancy, the fetus is small and the sow has good phlegm. According to the nutrient supply before mating, it can basically meet the nutrition needed for the growth and development of the fetus. In the later stages of pregnancy, the fetus grows fast and needs more nutrients, so it is necessary to increase the nutritional level of the diet.
Sow feed should pay attention to hygiene, quality assurance, mold, deterioration, freezing, toxic and irritating feeds, otherwise it may cause miscarriage, stillbirth and weaker tires. The feed should not be changed frequently, otherwise it is also unfavorable for pregnant sows. In addition, pregnant sows have a high metabolism and good appetite, and can use more comprehensive green roughage to reduce the cost of feeding. However, green roughage has high moisture content and large volume, but the gastrointestinal volume of pregnant sows is limited. At the same time, crude roughage has a high crude fiber content, poor palatability, and contradicts physiological characteristics and nutritional needs of pregnant sows. Therefore, attention should be paid. Green roughage processing modulation and increase the number of feeding.
The nutritional needs of sows are also different at different stages of pregnancy.
1. Pre-pregnancy (within less than one month after mating): At this stage, the embryo needs little extra nutrition, but there are two peaks of death. The amount of feed is relatively small and the quality requirements are high. Generally, 1.5 to 2.0 kg are fed. Pregnancy sows feed, dietary nutrition level: digestive energy 2950 ~ 3000 kcal / kg, crude protein 14% ~ 15%, the amount of green roughage can not be too high, can not be fed mildew and toxic feed.
2. Mid-pregnancy (31st to 84th days of pregnancy): 1.8 to 2.5 kg of pregnant sows are fed. The specific feeding amount depends on the sow's body condition. It can feed a large amount of green and blue succulent feed, but it must be given to the mother. Pigs are full and prevent constipation. To prevent excessive feeding, resulting in obesity of sows.
3. Late pregnancy (1 month before childbirth): At this stage, the fetus develops rapidly, and at the same time, nutrients are accumulated for the lactation period. The sow needs high nutrition and can supply 2.5 to 3.0 kilograms of lactating sow material. This stage should relatively reduce the green succulent feed or silage. Before 5 to 7 days before delivery, the amount of feed should be gradually reduced until feed is stopped on the day of birth. Nursing sows nutrition level: digestive energy 3050 ~ 3150 kcal / kg, crude protein 16% ~ 17%.
Laboratory ovens are ovens for high-forced volume thermal convection applications. These ovens generally provide uniform temperatures throughout. Process applications for laboratory ovens can be for annealing, die-bond curing, drying, Polyimide baking, sterilizing, and other industrial laboratory functions. Typical sizes are from one cubic foot to 0.9 cubic metres (32 cu ft) with temperatures that can be over 340 degrees Celsius.
Laboratory ovens can be used in numerous different applications and configurations, including clean rooms, forced convection, horizontal airflow, inert atmosphere, natural convection, and pass through.
Some of the types of industries that typically use these laboratory ovens are the healthcare industry, technology industry, and transportation industry. Civil engineering laboratories uses ovens for drying asphalt, soil, rock, or concrete samples.
Laboratory Oven,Benchtop Lab Oven,Lab Drying Oven,Laboratory Drying Oven
Unimedsume Trading Co., Ltd , https://www.ums-labmed.com