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The specific dosage is: Take 1000 chickens as an example, 5-8 weeks of age, weekly supply of 4-4.5 kg of gravel that can pass through a 1 mm sieve; 9-12 weeks old, supply grit through 3 mm sieve per week 8-9 kg; 13-20 weeks old, 10-11 kg of gravel per week through 3-4 mm mesh; 12-13 kg of gravel capable of passing through 4 mm mesh per week for over 20 weeks of age. The gravel can be mixed in the feed, or it can be put into the sand pit alone for any chicken to eat freely.
The gravel to be fed requires cleanliness. It is best to rinse with clean water first, then disinfect it with 0.1% potassium permanganate solution or other disinfectant, and then use it after drying. Replacement of fine gravel with coarse gravel should be gradual and gradual, and the replacement time should be 3-4 days, so as to avoid sudden replacement caused chicken discomfort, affecting growth and development.
Experiments have shown that adding proper amount of gravel in the caged chicken feed to improve the digestive capacity of the chicken can increase feed utilization by about 10%, and the chicken's constitution is significantly better than chickens that do not supply gravel.