Leena Watts
Poultry diets are composed of various feedstuffs, including cereal grains, soybean meal, fats, and vitamin and mineral premixes. These diets aim to provide the necessary energy and nutrients for the bird's growth, reproduction, and health. The specific nutrient requirements vary based on factors such as genetics, age, and production aims. For optimal growth and health, poultry need a balanced array of nutrients, including energy, protein, essential amino acids, essential fatty acids, minerals, vitamins, and water. Limiting nutrients in poultry diets refer to those that may be insufficient or require careful consideration to meet the bird's needs. These limiting nutrients include essential amino acids, such as lysine, methionine, threonine, and tryptophan, which are often provided as synthetic supplements. Additionally, vitamins, particularly fat-soluble vitamins like A, D, E, and K, play a crucial role in poultry health and are typically added as supplements to ensure adequate intake. Minerals, both macro and microminerals, are essential for bone formation and other vital functions, with calcium and phosphorus being critical for skeleton development. Water, while often overlooked, is an essential nutrient, and its availability must be ensured for adequate health and productivity.
| Characteristics | Values |
|---|---|
| Number of nutrients required | At least 38 |
| Nutrient requirement values | Refer to Nutrient Requirements of Poultry (National Research Council, 1994) |
| Water | Essential, required in greater amounts than any other nutrient |
| Carbohydrates | Major source of energy |
| Fats | Essential for absorption of fat-soluble vitamins A, D, E, and K |
| Proteins | Required for synthesis of body tissue, feathers, and egg production |
| Vitamins | Classified as fat-soluble or water-soluble; fat-soluble vitamins include A, D, E, and K |
| Minerals | Include macrominerals and microminerals; essential for bone formation and other functions |
| Amino acids | 9 are considered essential as birds are unable to synthesize them |
| Fatty acids | Linoleic acid is essential and must be included in the diet |
| Feed intake | Can be controlled by limiting amount of feed or adjusting nutrient content |
| Genetics | Different species, breeds, or strains have different nutrient requirements |
| Age | Nutrient requirements related to body weight and stage of maturity |
| Sex | Differences in nutrient requirements between sexes, particularly after onset of sexual maturity |
| Reproductive state | Level of egg production and sexual activity affect nutrient requirements |
| Ambient temperature | Poultry have increased energy requirements in cold temperatures and decreased requirements in hot temperatures |
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What You'll Learn
- Water: Poultry require ample water, which is essential for health and productivity
- Carbohydrates: Carbohydrates are the main energy source for poultry, with grains being the primary source
- Amino acids: Amino acids are vital for growth, immune function, and tissue development
- Vitamins: Fat-soluble vitamins A, D, E, and K are essential, with vitamin A enhancing egg yolk colour
- Minerals: Poultry need macrominerals for bone health and microminerals for metabolism
Water: Poultry require ample water, which is essential for health and productivity
Water is essential for the health and productivity of poultry. It is often overlooked, but it is one of the most important nutrients. Animals can survive longer without food than they can without water. Water is involved in every aspect of animal metabolism. It plays an important role in the regulation of body temperature, digesting food, and eliminating wastes.
Poultry require ample water of adequate quality and quantity. Ideally, drinking water should be clear, colourless, odourless, and tasteless. Water that is contaminated exhibits different characteristics depending on the contaminants. The presence of particles such as clay, silt, or organic material can make the water cloudy, which can interfere with the proper operation of watering equipment and can indirectly lead to adverse effects on flock performance. Water that is reddish-brown might contain excess iron, while yellow water is often caused by water that has passed through marshlands and peat soils. Blue or green water is generally associated with excessive copper, usually from copper piping and corrosive water. Cloudy or milky water is caused by the presence of very fine particles suspended in the water.
Water intake can be influenced by various factors, including environmental temperature, relative humidity, salt and protein levels in the diet, and the bird's productivity and growth rate. For example, during hot summer temperatures, birds can double, triple, or even quadruple their water intake. Therefore, an unlimited supply of water is essential. Water deprivation for more than 12 hours can negatively impact the growth of young poultry and egg production, and deprivation for over 36 hours can lead to a significant increase in mortality in both young and mature poultry.
The quality of water is also important. Acidic drinking water with a pH of less than 6 can negatively affect chicken performance, while water with a pH above 8 may reduce their water and feed consumption. Hard water, which contains high levels of dissolved minerals such as calcium and magnesium, can cause the buildup of sludge in water lines and reduce the effectiveness of soaps and disinfectants. Excess levels of certain minerals, such as sodium, chlorine, and potassium, should be avoided as they can stimulate excessive water intake and cause wet droppings.
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Carbohydrates: Carbohydrates are the main energy source for poultry, with grains being the primary source
Carbohydrates are the main energy source for poultry, with grains being the primary source. They make up the largest portion of a poultry diet. Corn, wheat, barley, and other grains are important sources of carbohydrates in poultry diets.
However, it is important to note that certain types of dietary carbohydrates are not easily digested by poultry. To improve nutrient absorption in a non-starch-based diet, it is recommended to add appropriate enzyme preparations to supplement diets containing rye or barley. Without proper supplementation, these diets will contribute very little to meeting the energy requirements of the flock.
The energy content of carbohydrates is lower than that of fats. Fats provide nine calories of energy per gram, while carbohydrates provide only four. Fats are necessary in poultry diets to aid in the absorption of fat-soluble vitamins A, D, E, and K. They also improve the palatability of feed and help reduce grain dust.
In warm weather, substituting calories from carbohydrates with calories from fat can help prevent birds from feeling overheated. This is because the body can absorb fats without expending any energy. Corn is a particularly advantageous fat source, as its fatty acids are mostly unsaturated.
Overall, carbohydrates play a crucial role in providing energy for poultry, with grains being the primary source. However, proper supplementation and consideration of fat content are important factors to ensure optimal nutrient absorption and energy requirements are met.
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Amino acids: Amino acids are vital for growth, immune function, and tissue development
Amino acids are organic compounds that play a critical role in protein synthesis and various physiological processes in poultry. They are the building blocks of proteins and are essential for growth, immune function, tissue development, and overall health in birds.
Poultry require a diet rich in amino acids to fulfil a range of functions in their bodies. These functions include the synthesis of structural and protective tissues such as skin, feathers, bones, and ligaments. Amino acids also contribute to the formation of soft tissues, including organs and muscles. Additionally, amino acids play a vital role in metabolising feed into energy, influencing growth and feed intake.
Birds cannot synthesise certain amino acids on their own due to the lack of specific enzymes. These amino acids, referred to as essential amino acids, include arginine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. Lysine, methionine, and threonine are particularly crucial for the synthesis of structural and functional proteins. The availability of these essential amino acids directly impacts the rate of muscle growth and overall growth performance.
The precise formulation of poultry diets to meet specific amino acid requirements is essential for optimal growth. By ensuring that the diet aligns with ideal protein profiles, producers can maximise growth rates, improve feed conversion ratios, and minimise amino acid wastage, thereby enhancing production efficiency. Additionally, formulating diets based on precise amino acid requirements helps reduce the excess intake of crude protein, minimising nitrogen excretion and mitigating the environmental impact of poultry operations.
Adequate levels of specific amino acids, such as arginine and glutamine, are vital for maintaining a robust immune system in poultry. These amino acids support the production of immune cells and antibodies, enhancing disease resistance and reducing the incidence of diseases. Nutraceuticals, which include amino acids, have beneficial pharmacological effects. They help prevent diseases, regulate immune responses, and improve overall health and growth performance in poultry flocks.
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Vitamins: Fat-soluble vitamins A, D, E, and K are essential, with vitamin A enhancing egg yolk colour
Poultry require a balanced diet with a variety of nutrients to support their high rate of productivity. Vitamins are essential for optimal poultry health, and a deficit of even one can have serious health consequences.
Fat-soluble vitamins A, D, E, and K are crucial in poultry nutrition. Vitamin A is necessary for normal growth, reproduction, and the maintenance of epithelial cells. It also enhances egg yolk colour, giving it the golden yellow yolk that consumers demand. Sources of vitamin A include fish liver oil, greens, wheat germ oil, and soybean oil. A deficiency in vitamin A can cause nutritional roup, characterised by conjunctivitis and oculo-nasal discharge.
Vitamin D3 is essential for the proper absorption and utilisation of calcium and phosphorus, which are required for normal growth, bone development, and eggshell formation. Vitamin D3 can be sourced from fish liver oil, alfalfa meal, and fish meals.
Vitamin E is a powerful antioxidant that improves the sensory and technological quality of meat, reducing juice drip and increasing the water-holding capacity of meat. It also acts as a second line of antioxidant defence in biological systems, preventing the formation of lipid hydroperoxides.
Vitamin K is vital for the synthesis of prothrombin and plays a crucial role in clotting mechanisms. It also has a protective effect against coccidiosis. A deficiency in vitamin K may cause an increase in blood spots in eggs, haemorrhages, and a failure of blood clotting. Sources of vitamin K include wheat germ oil, fish liver oil, alfalfa meal, soybean oil, and fish meals.
Fat must be included in the poultry diet to aid in the absorption of these fat-soluble vitamins. Antioxidants are also added to diets containing added fat to prevent the feed from becoming rancid.
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Minerals: Poultry need macrominerals for bone health and microminerals for metabolism
Minerals are essential for poultry health and are typically classified as macro-minerals and micro-minerals. Macrominerals are needed in higher quantities and play a crucial role in bone health, while microminerals are required in lower amounts and are essential for metabolism.
Macrominerals for Bone Health
The macrominerals required for bone health in poultry include:
- Calcium: Essential for proper bone formation, eggshell quality, blood clotting, and muscle contraction. Limestone and oyster shells are common sources of calcium.
- Phosphorus: Important for bone development, cell membrane structure, and various metabolic functions. Dicalcium phosphate is a common source of phosphorus.
- Magnesium: Assists with metabolic and muscle functions.
- Potassium and Sodium: These minerals are electrolytes that play a role in metabolic, muscle, and nerve functions.
- Chlorine: Necessary for the formation of hydrochloric acid in the stomach, aiding digestion.
Microminerals for Metabolism
The microminerals required for metabolism and other essential functions in poultry include:
- Copper
- Iodine: Iodine is necessary for the production of thyroid hormones, which regulate energy metabolism.
- Iron: Facilitates oxygen transportation within the body.
- Manganese
- Selenium
- Zinc: Involved in various enzyme-based reactions in the body.
While poultry require higher levels of macrominerals and lower levels of microminerals, both types of minerals are essential for maintaining the health and productivity of poultry.
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