Adding appropriate amount of sodium bicarbonate to the diet of laying hens in summer can improve the egg production rate and eggshell strength. The test proves that when the ambient temperature rises by 1 ° C at 25-30 ° C, the egg production rate decreases by 1.5%, and the egg weight decreases by 0.3g. If it is longer than 22 ° C for a long time, the eggshell becomes thinner and the egg weight decreases. Ran Rujun et al. (1990) used 53-week-old laying hens in the summer to test. Each layer of the experimental group added 0.3g of sodium bicarbonate to the basic diet (containing 0.2% salt) every day, and the control group did not add sodium bicarbonate. The grain contains table salt 0.3%. Results The egg production rate, eggshell density, eggshell percentage and eggshell thickness of the experimental group were increased by 11.15%, 0.20%, 1.10% and 3.57%, respectively, and the egg production rate was significantly different (P <0.05). Liu Shenting et al. (1987) used Jingbai laying hens and added 0.5% sodium bicarbonate to the summer diet. As a result, the egg production rate was increased by 3.3%, the eggshell quality was increased by 0.55 specific gravity, and the blood alkali storage and extraction
High 45mg / L.
Zhou Ming (1996) studied the suitable ratio of chloride to bicarbonate in layer diets for laying hens in hot seasons. Adding 0.2% sodium chloride (total dietary chloride total 0.35%) and 0.2% sodium bicarbonate (total dietary bicarbonate total 0.38%) to layer diets during high-temperature seasons can increase significantly Chicken egg production rate, eggshell quality and feed conversion rate (P <0.01). The proper ratio of chloride to bicarbonate in layer diets is 35:38.
According to the research of ICI British researchers (1988), sodium bicarbonate was continuously added to the laying hen feed for 8 months at different levels of 0.1% to 1.0%. The results showed that the egg production rate of all sodium bicarbonate added groups Both increase, the strength of the eggshell can be increased by up to 8%. Add 0.3% sodium bicarbonate to standard laying hen feed. After adding the egg laying peak of the group, the process of declining egg production rate with age is eased, and broken eggs are reduced by 1% to 2%. They also studied the interaction between sodium bicarbonate and phosphorus. When the sodium content of the feed with sodium bicarbonate as the sodium source was 0.55%, the phosphorus content was 0.30%, and the egg production rate was 75%; The egg production rate is 77%. The test results also show that due to the addition of sodium bicarbonate, the nitrogen utilization rate will increase by 3%.
