The first egg-laying period of the cherry grazing duck can be divided into four stages: 20-25 weeks of age is the initial period of egg production; 25-30 weeks of age is the pre-lay period; 30-48 weeks of age are the peak period of egg production; 48 The -66 week old period is the late stage o…
In the winter of 1534-1535, a team of French sailed on the St. Lawrence River in Quebec, Canada. During the cold…
Special types of aquatic products such as crabs, turtles, cockroaches, etc., generally take 3 to 5 years to grow at natural temperatures, and the use of greenhouse constant-temperature culture can be marketed in just 10 months to a year and a half, significantly shortening the feeding period. …