In the winter and spring cold season, chickens are prone to disorders of calcium and phosphorus metabolism due to lack of light and lack of calcium and phosphorus in the feed, causing abnormal bone tissue growth. This nutrient disease is called rickets in adult chickens and rickets in chicks. The diseased chickens are mainly characterized by poor development, loss of appetite, feathery hair, and keel changes. The joints between the soft ribs and hard ribs are round-shaped hard segments. The chest is flat and flat, protruding to both sides, and the mouth is soft, like an eraser, and can be bent. Foraging difficulties. The chickens can't stand on both feet and most of them lie on their backs. The chicks are curved or X-shaped. The spine is bent and the chickens are weak. The laying rate of the laying hens is reduced, the shells are thinned, and soft shell eggs are then produced. The thin eggs are thin. The boundaries between egg white and egg yolk are unclear. To ensure balanced calcium and phosphorus metabolism in winter chickens, the following points should be made:
1. According to the nutritional standards of chickens to prepare diets, give sufficient calcium, phosphorus and vitamin D, the best condition to use full-price compound feed, in order to ensure the chicken calcium and phosphorus needs.
2. Giving chickens plenty of sunlight (ineffective sunlight passing through ordinary glass), usually 16 hours a day is appropriate for sunshine, and the lack of sunshine can be replaced by the available electric lighting, and the chickens can be sun-bathed on the beach conditionally. Closed-type chicken farms should strengthen the irradiation of fluorescent lamps. It is advisable to increase the light for 10 minutes every week, and keep the time constant. At the same time, grit should be fed to improve the digestibility of feed for chickens.
3. Appropriate amounts of green feed, silage, and other vitamin-rich feeds such as cabbage leaves, carrots, and yam leaves.
If diseased chickens are found, the proportion of calcium and phosphorus in their diets should be promptly adjusted according to the nutritional standards, and additives should be added at the same time to increase the content of various minerals and vitamins in the diet. In particular, attention should be paid to vitamin D or cod liver oil supplementation. Promote the absorption of calcium and phosphorus in chickens. Under normal circumstances, add vitamin D2000 international unit per kilogram of feed, each chicken can be fed with 1 to 2 ml of cod liver oil daily. Severe illness can be subcutaneous injection of vitamin D injection, per kilogram of body weight daily 6000 ~ 10,000 international units, repeated every 3 to 5 days, usually 2 to 3 times can be effective, such as the use of oral calcium better.
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