Prevention and treatment of fatigue in laying hens by increasing the damage rate of eggs with difficulty in standing

Fatigue of caged laying hens, also known as osteoporosis of caged laying hens, often occurs during the peak period of egg production.

Laying hens

First, symptoms: the first layer laid soft-shell eggs, thin-shell eggs, egg damage rate increased, but there was no significant change in appetite, spirit and feathers. After that, there are difficulties in standing, bending claws and dyskinesia. If it is found in time and appropriate treatment measures are taken, most of them can recover in three or five days. Otherwise, the symptoms gradually aggravate, resulting in lameness, inability to stand, sunken sternum, easy fracture of ribs and paralysis; autopsy can find that wing bones and leg bones are fragile.

Second, the reasons are as follows: 1. The content of calcium in diet is insufficient and there is an imbalance between calcium and phosphorus. 2. Excessive crushing of stone powder and bone powder can quickly absorb and excrete calcium in the stomach and intestines of laying hens, resulting in low utilization rate of calcium. 3. The activity of laying hens is small. 4. during the breeding period, layers may be attacked by parasites and may cause the disease in terms of management.

3. Prevention:

The main results are as follows: 1. To ensure full-price nutrition and scientific management, so as to achieve the best body weight and body condition during sexual maturity.

2. 2-4 weeks before the start of production, feed a special pre-production feed containing 2%-3% calcium, and when the laying rate reaches 1%, switch to laying hen feed in time.

3. The content of calcium in the feed should not be less than 3.5%, and the appropriate ratio of calcium and phosphorus should be guaranteed, adding more than 32000 international units of vitamin D32000 per kilogram of feed.

4. Provide coarse-grained stone powder or shell powder. Coarse-grained calcium accounts for 1, 2, 2, 3 of the total calcium. The calcium source particle is more than 0.75 mm, which can not only improve the utilization rate of calcium, but also avoid calcium graded precipitation. In the hot season, coarse calcium particles are evenly scattered in the trough according to about 1% of feed consumption every afternoon, which can not only provide sufficient calcium sources, but also stimulate the appetite of chickens and increase food intake.

5, do a good job of blood calcium monitoring, when found to produce soft-shell eggs, blood calcium test should be done.

IV. Treatment

When diseased chickens are found, they should be picked out in time, raised alone, and supplemented with bone particles or coarse calcium carbonate to allow laying hens to eat freely and recover within a week. Under the condition of stopping production of diseased chickens and ensuring their normal drinking water and food, they can recover by themselves in no more than a week. For chickens with low blood calcium, 2%-3% coarse calcium carbonate is added to the feed, and 2000 international units of vitamin D3 are added to each kilogram of feed. After 2-3 weeks, the serum calcium of chickens increased to the normal level, and the incidence decreased. Coarse-grained calcium carbonate and vitamin D3 supplements last about a month. If the disease is found later, it will take about 20 days to recover, and individual seriously ill laying hens may die.