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Providing Nutrients. Chapter 17. Providing Nutrients. Must be healthy to function efficiently and yield maximum profits Satisfy needs for maintenance growth, fattening, reproduction, lactation, egg laying, wool production, and work. Maintenance. Approximately half of all feed used in
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Providing Nutrients Chapter 17
Providing Nutrients • Must be healthy to function efficiently and yield maximum profits • Satisfy needs for • maintenance • growth, fattening, reproduction, lactation, egg laying, wool production, and work
Maintenance • Approximately half of all feed used in • tissue repair • control of body temperature • energy for vital organ function • water balance • Feedlot animals - 30-40% • Mature - may be near 90%
Body size • Maintenance for larger animals is higher • A 1000 lbs animal does not require twice as much as a 500 lbs • 500 lbs - 15 lbs feed • 1000 lbs - 25.5 lbs feed • Table 17.1
Growth • Protein synthesis in excess of its breakdown • Young growing animals need high amounts of protein • Monogastric animals also need specific amino acids
Growth • Calcium and phosphorus for bone growth • Iodine - goiter • Selenium -white muscle disease • Indoor animals need a source of Vitamin D
Growth • Ruminants may or may not need Vit. A • Most vitamins must be supplied to pigs and poultry • Energy - • large sources Milk and grains • others grazed forages and hay
Fattening • Gain from fattening more expensive than growth • 2.25 times • Usually are full-fed and high energy ration
Reproduction • Gamete production • Fetal growth • Animals could be lower in fertility if • losing weight rapidly • overly fat • deficient in phosphorus • Nutrients for growing fetus greatest in the last trimester
Lactation • High protein requirement • Calcium and phosphorus • Energy most vital requirement • Adequate feed during lactation helps with next conception • Dairy cow 40:60 roughage to concentrates
Egg Laying • Broilers - main objective growth discussed earlier • Usually fed ad libitum or all they want • Need to have adequate concentrations of energy, protein, vitamins, and minerals
Wool • In addition to nutrients for maintenance, growth, and reproduction • Wool is mainly protein so need protein in diet • After shearing may need more energy to maintain body temp
Work • The major component is energy for work • Horses, mules, and donkeys rely partly on perspiration to remove wastes