Third, the breeding of parental breeder chickens The breeding and management of parent breeder chickens can be divided into three periods, namely the brooding period (0 to 6 weeks of age), the breeding period (7 to 22 weeks of age) and the laying period (23 to 68-week-old), different breeds of.......
1. Incidence conditions The pathogen of melon powdery mildew belongs to Ascomycetes, Erysiphe spp., Erysiphe spp. or monofilament genus. Pathogens use mycelia or ascus to overwinter on sick bodies to produce spores, spread by wind and rain. Spore germination directly invades the epidermal cell.......
Tan Mei Mei products are cool fruit, its raw material is semi-finished plum embryo, not fresh plum fruit. The processing technology is as follows: (1) Desalination of plum germ: desalination with flowing water is quicker than desalination with static water, but the amount of water required is .......
1. Do not remove the detachable parts without removing them. 2. When the distribution pump is in operation, a small oil pan should be used to take the outflow of diesel oil. 3. When disassembling the oil pump rotor, it must be removed in the direction of rotation of the distribution rotor. Use.......
Nowadays, the domestic ducks that people raise are made by artificial domestication and breeding of wild ducks. They still maintain biological characteristics that are sensitive to environmental stress conditions. Duck ducks are much more sensitive than ducks. Environmental stress factors (tem.......
The family cultivating Phalaenopsis is restricted by conditions, which often restricts the growth of Phalaenopsis. Sometimes it is improperly watered or the potting soil matrix is ​​poor, and it will cause rot-root phenomenon and gradually die. It is a pity for the flower growers.......
Kiwi, a genus of kiwifruit and cynomolgus, is a wild vine. China's vast mountainous areas are rich in kiwifruit resources. In addition to Qinghai, Xinjiang, Inner Mongolia and a few other provinces (regions), almost all of the country is distributed kiwifruit. Kiwi fruit is sweet and sour .......
A small amount of cuttings and flowers are used by the family to promote rooting and survival. In the absence of naphthalene acetate and .......
Codonopsis is a rare Chinese herbal medicine, with dry root medicine, with qi nourishing, and the spleen and stomach, law Qingfei effect. Its stems and leaves were often abandoned. However, recent studies have found that the stems and leaves of Codonopsis pilosula contain volatile oil, various.......
Pan Xiuqiang Hu Jianyong (Shandong Aluminium Company) ZL50 loaders often have some problems during use and maintenance. The reasons are difficult to find. The following author makes specific analysis of several difficult faults and their causes to help them find out faults as soon as possible........
Perhaps one day, genetically modified fish may be used to provide humans with proteins to treat diseases such as lung diseases, liver diseases and even cancer. This is not a joke. Now, scientists in Britain and the United States and Florida have already used human blood coagulation factors fro.......