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Female H. suis lay 3–6 eggs per day following a blood meal and mating, eventually laying about 90 eggs. The amber eggs are deposited on the lower half of the swine's side, or the neck, shoulders, flanks, or on the back of the ears. Lice eggs are commonly referred to as "nits". [Note 1] These nits have small holes for gas exchange, called ...
On average, a chicken lays one egg a day, but not on every day of the year. This varies with the breed and time of year. In 1900, average egg production was 83 eggs per hen per year. In 2000, it was well over 300. In the United States, laying hens are butchered after their second egg laying season.
Intensive piggeries are generally large warehouse-like buildings or barns with little exposure to sunlight or the outdoors. Most pigs are officially entitled to less than one square meter of space each. [7] Indoor pig systems allow many more pigs to be monitored than historical methods, ensuring lowered cost, and increased productivity.
Pigs are a popular form of livestock, with more than one billion pigs butchered each year worldwide, 100 million in the United States. The majority of pigs are used for human food, but also supply skin, fat and other materials for use in clothing, ingredients for processed foods, [6] cosmetics, [7] and medical use. [8]
In recent years, kidneys from genetically modified pigs have been temporarily transplanted into brain-dead donors to see how well they function, and two men received heart transplants from pigs ...
In rural locations, pigs and poultry can obtain much of their nutrition from scavenging, and in African communities, hens may live for months without being fed, and still produce one or two eggs a week. [22] Pigs in an intensive system, Midwestern United States
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Microorganisms for vaccine manufacture are grown under controlled conditions in liquid solutions ("media") which provide the nutrients necessary for growth. These can include cow plasma. [42] Chicken eggs are used in the production process of some vaccines. For influenza vaccination there are non-egg alternatives. [43]