Frequently, some farmers choose the pre-mixed mixture with unsatisfactory effect, and then purchase the compound multi-dimensional extra addition. Some farmers or feed enterprises choose low-cost multi-dimensional, and then double use. Is this practice beneficial or harmful?
First of all, we should understand the truth that nutritional balance is the most important, and any nutrient too much is unhelpful or harmful.
Long-term excessive intake of fat-soluble vitamins is toxic. According to reports: vitamin A once oral adult 50-100IU million, children 300,000 IU, can be acutely poisoned to death.
In the national feed additive use specification, vitamin A is recommended to be 1500-4000 IU per kg of laying hens, with a maximum limit of 10,000 IU; VD3 400-2000 IU, with a maximum limit of 5000 IU.
Vitamin A, D3 and eggshell are directly related. In order to avoid complaints, the amount of vitamins in the commercially available multi-dimensional or compound premix is ​​converted into the amount of the compound. Vitamin A is about 10,000 IU, vitamin D3 is about 3,000, and other ingredients are The difference is huge.
Generally speaking, vitamin A and D3 are more than 4-10 times longer than the required amount, and they will be poisoned for a long time. The absorption rates of vitamins A and D3 will change with the conditions. Therefore, long-term premixes with additional multi-dimensional or multi-dimensional doubling use are likely to reach toxic doses.
The hazard of excessive addition can be divided into several levels: nutritional antagonism, metabolic disorders, chronic poisoning - acute poisoning.
Symptoms of performance include: reduced production performance, liver damage, fat metabolism disorders, rectal prolapse, diarrhea, weight loss or slow growth, reduced feed intake, feather shedding, kidney enlargement, gout, etc.
According to reports, when broiler vitamin A is increased from 10,000 IU/kg to 20,000 IU/kg, feed consumption increases and growth rate decreases; 42-day-old broiler, vitamin A increases to 15000 IU/kg, tibia calcium content decreases, leg disease increases .
The side effects of excessive addition of vitamins A and D3 are often neglected, mainly because the initial production performance may be improved by excessive addition, but after a period of accumulation to a certain amount, negative effects occur, often attributed to other aspects.
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