The productivity of ducks, beyond factors such as species, feed, feeding techniques, and age, is also closely related to their physical build and external appearance. Through an investigation of the production processes in specialized and key duck farming households, the author has developed a set of criteria for selecting high-yielding ducks. These criteria are outlined below: First, high-yielding ducks have large, bright eyes that seem to "pop" out, with slightly smaller heads and slender necks. They appear alert and intelligent, often resembling a "snakehead." In contrast, low-yielding ducks typically have small, dull eyes, with larger heads and thicker necks. Second, high-yield ducks have broad backs and deep chests, with dense and smooth feathers. Low-yield ducks, on the other hand, tend to have narrow backs and chests, with sparse or disheveled feathers that lack luster. Third, when holding a duck by its neck, high-yielding ducks will extend their legs straight down without movement, with each toe spread apart. Low-yielding ducks, however, have bent legs and closed toes. Fourth, during the laying period, high-yield ducks have a wide space between the pubic bones, which feels soft and elasticâ€”able to fit 3 to 4 fingers. Low-yield ducks have a narrower space, only able to fit 2 to 2.5 fingers. Fifth, high-yielding ducks have full, soft, and sagging buttocks, with the pubic and sternum areas accommodating 3 to 4.5 fingers. Low-yield ducks have smaller, harder bodies, with limited space, fitting only 2.5 to 3 fingers. Sixth, high-yielding ducks have a large, moist, and semi-open cloaca, while low-yield ducks have a tight, dry, and wrinkled cloaca. Seventh, in spring, high-yield ducks have smooth and tightly packed feathers, showing high metabolic activity and liveliness. Low-yield ducks, by contrast, have messy and dull feathers, with sluggish movements. Eighth, during autumn, high-yield ducks may have messy feathers due to nutrient loss from egg production, and their abdomens may be soiled, causing them to walk unsteadily. Low-yield ducks, however, usually have neat and tidy feathers after molting. These observations provide farmers with practical visual indicators to assess and select ducks with better egg-laying performance, helping to improve overall productivity.

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What problems should we pay attention to when using solar energy for power supply?
1. The whole day sunshine time of monitoring points along the expressway shall be considered first. As the main energy of the power supply system comes from sunlight, the sunshine exposure time must be considered, which is particularly prominent in mountainous areas where there is little sunshine, but not in plain areas.
2. Working power, working voltage and current of monitoring facilities along the expressway. After considering the power of the whole load, we can choose the solar panel that is more suitable for the long-term operation of the equipment.
3. If the battery discharge cannot make the monitoring equipment work for a long time, the monitoring system will be paralyzed in the rainy season, but the expressway is prone to accidents in the rainy season.
4. The conversion rate of solar cells is low. At present, the conversion rate of solar cell power supply is only about 20%, that is to say, if the silicon solar cell is spread over a square meter, 100~200W of power can be obtained, which is obviously not enough to meet the long-term operation of the monitoring equipment. Of course, with the development of technology and the improvement of the quality of crystalline silicon cells, we can obtain more power resources in a smaller area in the near future.

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