The lack of calcium and phosphorus is a chronic nutrient metabolic disease in poultry and its prevention and control methods are as follows.
Using full-rate diets, pay attention to calcium, phosphorus, and vitamin D levels, as well as the calcium and phosphorus ratios. The purchased bone meal shall be analyzed for calcium and phosphorus, and the poultry shall be regularly sampled for the determination of serum alkaline phosphatase activity and free hydroxy-acid to monitor the metabolism of calcium and phosphorus and to take preventive measures as soon as possible; pay attention to the pigeons. Feeding before feeding off the nest must be tuned for food and cannot be suddenly fed.
Cage and poultry should be provided with sufficient sunlight, or regularly exposed to ultraviolet light (about 1 to 1.5 meters, about 5 to 15 minutes), or be fed with cod liver oil or vitamin D3; diets should be adjusted immediately after onset. Increase the amount of bone meal or defluorinated dicalcium phosphate in the diet of young birds and young birds, 0.5 to 1 times the normal increase, and the proportion is appropriate, even feed for 2 weeks, after the poultry group returned to normal after normal feeding; Stone powder and other calcium, and pay attention to vitamin D, vitamin A, vitamin C and other complex vitamins, egg production and eggshell hardness back to normal, change the feed to normal feed. The ratio of calcium to phosphorus in laying hens was 6.5:1 and chicks were 2.2:1.
Ventilation is one of the most important components in a successful greenhouse.
If there is no proper ventilation, greenhouses and their growing plants can become prone to problems. The main purposes of ventilation are to regulate the temperature and humidity to the optimal level, and to ensure movement of air and thus prevent build-up of plant pathogens (such as Botrytis cinerea) that prefer still air conditions. Ventilation also ensures a supply of fresh air for photosynthesis and plant respiration, and may enable important pollinators to access the greenhouse crop.
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