The average daily egg production per chicken is the key indicator for checking the chicken feeding level. Under the premise of high egg production rate, increasing egg weight is one of the effective measures to increase the daily production of eggs. This article introduces the influence factors of egg weight and how to regulate egg reproduction. The main factors affecting the egg weight are: breed, the age of the laying hen, the weight of the laying hen, the environmental factors, nutrition, and lighting procedures.

1 variety

According to statistics of the average egg weight of five brown shells and four white shell chicken hens in the past 10 years, the average egg weight of the brown shell was 63.5 g, and the weight of the Issa brown eggs was the largest (65.5 g); the average egg weight of the white shell eggs was 61.9 g. Chevrolet ranks first in 62.8g. The average egg weight of the brown shell layer chicken is higher than that of the white shell layer chicken. Since there is generally a strong negative correlation between egg weight and egg production, it is difficult to increase both traits at the same time. It is relatively easy to breed and increase the number of eggs laid on the premise of maintaining the egg weight level.

2 Age of laying hens

Generally, the first egg is lighter, and the eggs of the laying hen are heavier. Taking the Roman brown commercial layer as an example, the average egg weight at 21 to 24 weeks is 55.05 g, and the average egg weight at 33 to 36 weeks is 63.2 g, the latter weighed 8.15 g more than the former, an increase of 14.80%. At 57 to 60 weeks of age, the average egg weight was 66.65%, 11.6 g more than 21 to 24 weeks of age, an increase of 21.07%. Therefore, as the age of egg production increases, the egg weight also increases.

3 Weight of laying hens

Body weight was negatively correlated with egg production rate and positively correlated with egg weight. The greatest influence on the early egg weight is the weight of the layer when it is transferred into the laying house. The weight at the age of 18 weeks has a decisive influence on the weight of the first egg. Therefore, specialized households must pay attention to the early feeding and management of laying hens, so that the weight of the hens at the start of production can reach the standard weight, or the upper limit of the recommended weight range.

4 Environmental factors

In addition to the egg production rate of the laying hens, the environmental temperature has a greater effect on the egg weight. Raising the temperature of the house can reduce the weight of the eggs; decreasing the temperature of the house can increase the weight of the eggs. Foreign studies have shown that for every 1°C increase in temperature, egg weight decreased by 0.17-0.98g, with an average of 0.4g. When the average Sherwin temperature is 27.5°C, the proportion of small and medium sized eggs is 32%; when the average Sherwin temperature is 31.6°C, the proportion of small and medium sized eggs is 67%. If the expected egg size is significant, the seasonal broiler must be kept properly. Management work, the temperature of the house is controlled at 19 ~ 23 °C, then the egg weight is greatest.

5 Nutrition

A sufficient amount of water is very important for maintaining a large number of eggs and the normal size of the eggs. The water content of the eggs is about 65%. Every egg produced requires 340mL of water. Minor changes in the amount of drinking water will produce weight for the eggs. Great influence. Especially when the egg production peak and the ambient temperature are high, it cannot be cut off. When water shortage can cause a drop in egg production and egg weight, water stress needs a long recovery period. The feed intake of laying hens varies with the energy content of the diet. Feed intake is low and energy consumption is insufficient, which can lead to decreased egg production. Under the premise of not increasing protein, the energy of the ration was appropriately increased, and the egg production and egg weight were improved. The main sources of linoleic acid in the feed are vegetable oils: safflower seed oil, corn oil, soybean oil, and cottonseed oil. Yellow corn is the main source of linoleic acid in most diets. Wheat and barley are the main grain-derived diets, and their linoleic acid content may be lower than the optimum level. Adding decanoic acid is an effective method to control egg weight without reducing the egg production rate. In the early stage of laying eggs, adding more linoleic acid can increase the egg weight. The difference in linoleic acid intake is 1.48g per bird per day and 2.74g egg weight difference is 0.4g. The addition of choline chloride in the diet of layer chickens can increase the weight of eggs, and it is always better to add than the interval addition. The weight of the eggshell accounts for about 10% of the total weight of the egg. The weight of the eggshell formed by the well-absorbed calcium feed is 0.1-0.5g heavier than the improperly selected calcium feed. It also has a certain influence on the egg weight. . In the case of normal calcium content, the egg weight was reduced by approximately 0.4 g for each 1% increase in calcium. 4% of the shell powder and 3.5% of the small limestone can be used to obtain the best eggshell weight.

6 Different breeds of birds breed in different seasons. The chicks introduced from October to February of the second year are welcome to the late growing season and are prone to premature birth. They are introduced from April to August. Chicks are gradually shortened in the late growth period and it is easy for chickens to delay production. Early or late opening of the flock will seriously affect economic efficiency. If the chicken body has not yet been successfully promoted to produce, the diet often used by the young hens cannot meet the nutritional needs of all parties. As a result, the weight gain is slow and thin, and the egg weight is not increased for a long period of time. There are many phenomena. Therefore, we must plan chickens at the proper age.

7 With normal feed intake, increasing feed intake can increase egg weight. Therefore, it is of utmost importance to remind breeders to do hygiene and epidemic prevention of laying hens and heatstroke prevention and cooling.

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