The high temperature in summer can easily lead to a drop in egg production rate, smaller egg weight, poor egg shell quality, and increased dead-fishing rate. The feed nutrition of the layer should be controlled to maintain the production performance of the layer.
1, feed intake decreased in high temperature environment, layers of crude protein fed daily 4-5 grams less than normal, less energy 60-70 kcal. The nutrient concentration of the diet must be increased, especially methionine, lysine, tryptophan and unsaturated fatty acids. The amount of methionine added is generally 200-300 grams per ton.
2. Increased requirements for fat and fat-soluble vitamins under high temperature conditions. When the ambient temperature rises from 25°C to 38°C, the requirement for vitamin A increases by a factor of three; the requirements for vitamin E and vitamin B2 also increase exponentially. Therefore, it is necessary to increase fats and fat-soluble vitamins during the hot season. The amount of fat added was 1-3% of the feed, and the amount of fat-soluble vitamin was 2-4 times normal.
3, the high temperature environment can cause the lack of choline, because chickens at the peak of egg production, endogenous synthesis of choline can not meet the needs of metabolism, long-term high temperatures can cause fatty liver syndrome in some chickens. Therefore, to increase the amount of choline added.
4, add sodium bicarbonate. The hot wheezing exhales a large amount of carbon dioxide, so that the body's acid-base balance and osmotic pressure balance are destroyed. Sodium bicarbonate is not only an acid-base equilibration buffer, but also can alleviate the respiratory alkalosis caused by the increased breathing. It is also conducive to the formation of egg shells, increasing egg production rate and reducing mortality. The proportion of chicks was 0.1% in the diet; 0.2% of young (in meat) chickens; 0.3% of adult (chicken) chickens.
5. Adding aspirin helps to dissipate heat and increase egg production, which is beneficial to heat balance. The addition rate in the diet is 0.05%.
6. Bacitracin-added zinc can inhibit the reproduction of harmful microorganisms in the gut of livestock and poultry, reduce the competition for nutrients with the host, increase appetite, increase egg production and feed compensation. Add 0.002% to the diet.
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