2009网络营销十大经典案例(国外英语资料).docVIP

2009网络营销十大经典案例(国外英语资料) The second chapter animal nutrition requirements and feeding standards Teaching requirements 1. familiar with the basic concepts of nutrition requirements and feeding standards; 2. to understand the determination of nutritional requirements and indicators of feeding standards; 3. be familiar with the concepts of maintenance and maintenance, understand the significance of maintaining needs and the maintenance requirements of main nutrients; 4. grasp the basis of the nutrition requirements of animals at different physiological stages, and understand the relationship between the nutrition level and the production performance of livestock and poultry. Section 1 basic concepts of nutrition requirements and feeding standards Nutritional requirements: nutritional requirements are the amount of nutrients needed per head (animal) per day for energy, protein, minerals and vitamins. Animals must constantly ingest nutrients from the outside during their survival and production. Different animals, different physiological conditions, different production levels and different environmental conditions have different nutrient requirements, so it is necessary to specify the nutritional requirements of specific animals in order to guide the production. Two, feeding standard: according to a large number of test results and the actual production of animal breeding summary of various nutrients to the specific animal quota provisions, the provisions of this quota nutrition system called feeding standard. In brief, feeding standards are descriptions or descriptions of the amount of nutrients required by an animal. Types of feeding standards can be roughly divided into two categories, one is the national regulations and promulgated the breeding standard and called the national standard; the other is a large breeding company according to the characteristics of fine varieties or lines of their breed, developed with the feeding standard varieties or lines of nutritional