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The nutritional quality of feed is influenced not only by the nutrient content, but also by many other factors such as feed presentation, hygiene, digestibility, and effect on intestinal health. [17] Feed additives provide a mechanism through which these nutrient deficiencies can be resolved, improving animal rate of growth, health, and well ...
At around the same time the FCR based on weight gain for broilers in Brazil was 1.8. [25] The global average in 2013 is around 2.0 for weight gain (live weight) and 2.8 for slaughtered meat (carcass weight). [26] For hens used in egg production in the US, as of 2011 the FCR was about 2, with each hen laying about 330 eggs per year. [25]
Cattle feedlot in Colorado, United States. Animal husbandry is the branch of agriculture concerned with animals that are raised for meat, fibre, milk, or other products.It includes day-to-day care, management, production, nutrition, selective breeding, and the raising of livestock.
The cattle industry takes the position that the use of growth hormones allows plentiful meats to be sold for affordable prices. [24] Using hormones in beef cattle costs $1.50 and adds between 40 and 50 lb (18 and 23 kg) to the weight of a steer at slaughter, for a return of at least $25. [25]
The standard text in the United States, Nutrient Requirements of Beef Cattle, has been through eight editions over at least seventy years. [9] The 1996 seventh edition substituted the concept of metabolizeable protein for the sixth edition's crude protein. [10] [11] In the 20th century, Canadian practice followed the American guidance. [12]
Most foods contain a mix of some or all of the nutrient classes, together with other substances. Some nutrients can be stored internally (e.g., the fat soluble vitamins), while others are required more or less continuously. Poor health can be caused by a lack of required nutrients or, in extreme cases, too much of a required nutrient.
The standard text in the United States, Nutrient Requirements of Beef Cattle, has been through eight editions over at least seventy years. [26] The 1996 sixth edition substituted for the fifth edition's crude protein the concept of " metabolizeable protein ", which was defined around the year 2000 as "the true protein absorbed by the intestine ...
A nutrient is a substance used by an organism to survive, grow and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi and protists. Nutrients can be incorporated into cells for metabolic purposes or excreted by cells to create non-cellular structures such as hair, scales, feathers, or exoskeletons.