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Specific-pathogen-free (SPF) is a term used for laboratory animals that are guaranteed free of particular pathogens. Use of SPF animals ensures that specified diseases do not interfere with an experiment. For example, absence of respiratory pathogens such as influenza is desirable when investigating a drug's effect on lung function.
Poultry feed is food for farm poultry, including chickens, ducks, geese and other domestic birds. Before the twentieth century, poultry were mostly kept on general farms, and foraged for much of their feed, eating insects, grain spilled by cattle and horses, and plants around the farm.
There is no specific requirement of feed intake for each livestock because their feed continuously varies based on the animals' age, sex, breed, environment, etc. However, basic nutrient requirements of a livestock's feed must consist of protein, carbohydrates, vitamins and minerals. [18]
Insects as feed are insect species used as animal feed, either for livestock, including aquaculture, or as pet food. As livestock feed production uses ~33% of the world's agricultural cropland use, insects might be able to supplement livestock feed. They can transform low-value organic wastes, are nutritious and have low environmental impacts.
Specific strains of the New Zealand White have been developed, with differing resistance to disease and cancers. Additionally, some experiments call for the use of 'specific pathogen free' animals, which require specific husbandry and intensive hygiene. [citation needed]
Bambermycin (flavomycin) is a complex of antibiotics obtained from Streptomyces bambergiensis and Streptomyces ghanaensis used as a food additive for beef cattle, dairy cattle, [1] poultry and swine. [2] The complex consists mainly of moenomycins A and C. [3]