Choose the breed of chicks.

1. Different breeds of chickens produce different proportions of double-yolk eggs. This is also determined by genetics and cannot be changed.

2. Chickens with poor uniformity, substandard weight, and incomplete reproductive systems will have more double-yolk eggs around the peak of egg production.

Method: Before 13 weeks, the weight of the chickens reaches the standard, and the uniformity is preferably not less than 85%; after 13 weeks, do a good job of gaining weight every week.

3. Filling in light too early stimulates the laying hens to increase production and start production, but the neck length is not up to standard, the reproductive system is not fully mature, the production starts and the normal production cannot control ovulation, and the number of double yolk eggs produced increases. .

Method: When the body weight and neck length do not meet the standard, do not add light in advance. For example, the light time of Hylan Brown at 30 weeks is increased to 15-16 hours.

4. Since the first-time chickens have just started giving birth, the reproductive hormones in their bodies are relatively disordered and they will produce double-yolked eggs.

5. If subjected to adverse stress during egg laying, double yolk eggs will be produced. Too much light can also stimulate the production of double-yolked eggs.