Methods of Feeding and Animal Nutrition

Basal Energy Requirements and Nutritional Science

Definition of Diet and Ration: A diet is fed, or a ration is provided, to an animal based on the specific nutritional composition of the feed and the energy requirements of the animal.
Basal Energy Requirements (BER): This represents the minimum amount of energy an animal’s diet must provide.
Standard Units of Energy: * Joule: The standard scientific unit for energy, defined as a measure of work done by force over distance. Specifically, a joule is the work done by a force of $1\,\text{Newton}$ acting over a distance of $1\,\text{meter}$ . * Kilojoule: A unit of energy comprising one thousand ( $1000$ ) joules.
Protein Requirements Based on BER: * Normal Dog: Requires approximately $1\,\text{g}$ of protein per $100\,\text{kilojoules}$ per day. * Normal Cat: Requires $1.5\,\text{g}$ of protein per $100\,\text{kilojoules}$ per day.
Adjustments to Protein and Energy: * Ill Patients: Energy requirements are higher; therefore, the BER must be adjusted upward. * Liver or Kidney Disease: The protein component of the diet must be adjusted downward. * Protein Malnutrition: The protein component must be adjusted upward.

Maintenance Feeding of Adult Animals

Maintenance Feeding Definition: The provision of a good-quality, complete, and well-balanced diet for a healthy adult animal that is not pregnant and is not a "working" animal (such as a racing dog).
Feeding Protocols: * Animals should be fed individually to monitor intake. * Cats and Overfeeding: Owners often overfeed cats by leaving dry food available at all times, especially in multi-cat households. * Dry Food Characteristics: Dry food has a lower moisture content than wet food, meaning less volume is required to fulfill energy and dietary needs.

Feeding for Reproduction

Factors for Breeding Stock Success: 1. Genetics. 2. Proper care and management. 3. Proper nutrition and feeding.
Weight Monitoring in Breeding Stock: * Animals should have their weight monitored closely. * Overweight animals may be unable to breed effectively. * Obese females generally have lower conception rates and often experience problems during delivery.
Essential Guidelines for Optimal Breeding Condition: 1. Ensure the ration is complete and balanced. 2. Provide unlimited quantities of fresh, clean water at all times. 3. Avoid vitamin or mineral supplements if the ration is already complete and balanced. 4. Do not vary the diet. 5. Avoid Overfeeding: While intake increases during gestation, the increase should be gradual. Significant increases occur during the last third of gestation. In dogs, this may reach $25\,\%$ more than the normal maintenance diet. 6. Dairy Cattle Exception: Dairy cattle maximize feed intake several weeks after peak milk production and may lose weight during this period. 7. Avoid Underfeeding: Underfed animals may lose too much weight, becoming unable to provide for young or failing to breed during the next heat cycle.
Weaning and Post-Reproduction Nutrition: * Once young are weaned, the food ration should decrease. * Method 1: Gradual changes in the food ration. * Method 2: No food on the day of weaning, followed by gradual increases to maintenance levels. (Note: This is intended to stop milk production and is inappropriate for cattle).

Nutritional Components in the Reproductive Cycle

Water Importance: Lack of water causes reduced feed intake and weight loss. It also increases nitrogen and electrolyte loss.
Carbohydrates and Fats: Their importance is greatest during lactation. The body burns fat reserves to maintain high milk output. Energy intake (carbs/fats) should increase during embryonic development and milk production and decrease as weaning approaches.
Hormonal Links: High fertility is linked to high blood levels of the hormone progesterone, which is associated with positive energy balance.
Protein: Essential in every stage. Deficiency can lead to: * Delayed puberty. * Infertility. * Abnormal fetal growth and development. * Decreased milk production.
Minerals and Infertility: * Calcium: Necessary for fetal skeletal growth and lactation. * Phosphorus: Associated with skeletal development, lactation, and energy metabolism. * Iodine: Required for thyroid hormone. Deficiency leads to delayed puberty, lack of estrus, or abnormal fetal development. * Copper: Required for connective tissue and red blood cell development; deficiency causes general fertility decline. * Cobalt: Required for bacteria to synthesize vitamin B12. Lack of this vitamin causes decreased conception rates and irregular estrus cycles. * Manganese: Deficiency causes deformities, delayed ovulation, and decreased estrus. * Zinc: Influences testicular development in males; deficiency causes lower conception rates in females.
Vitamins: * Vitamin A: Deficiency causes delayed puberty in young; decreased sexual interest, inability to breed, or abortion in adults. * Vitamin C: Animals usually synthesize it, but stress or lack of sunlight can cause deficiency. * Vitamin D: Crucial for calcium and phosphorus metabolism; deficiency leads to rickets. * Vitamin E: Deficiency is responsible for birth defects, reduced birth rates, and stillbirths.

Feeding Orphans and Neonates

Candidates for Supplemental Feeding: Neonates not nursing properly, mothers with insufficient/poor-quality milk, or cases where the mother/neonate is stressed/diseased.
Feeding Methods: * Puppies: Bottle, eye dropper, or stomach tube (highly recommended for weak or poorly thriving puppies). * Kittens: Best fed with a bottle or eye dropper.
Tube Feeding Procedure: 1. Use a urinary catheter or feeding tube. 2. Measure the tube against the animal and mark it at the level of the stomach. 3. Warm the food (formula). Use a syringe placed in warm water. Avoid microwaves due to dangerous "hot spots"; if used, stir and test temperature before use. 4. Ensure no air is in the syringe. 5. Lubricate the tube with water-soluble lubricant. 6. Hold the puppy/kitten horizontally with the head extended. 7. Advance the tube through the mouth, into the esophagus, and into the stomach. Withdraw immediately if the animal struggles; never force the tube. 8. Press the plunger until resistance is felt. 9. Frequency: Generally three to four feedings per day.
Homemade Milk Replacer Recipe: * $1\,\text{cup of milk}$ * $1\,\text{tablespoon corn syrup}$ * $3\,\text{egg yolks}$ * $1\,\text{or } 2\,\text{drops of human liquid multivitamin}$ * $\text{A pinch of salt}$ * Note: Milk replacers may cause diarrhea.

Weaning Protocols and Juvenile Feeding

Timeline: * Puppies: Can begin solid food at $2.5\,\text{to } 3\,\text{weeks}$ . * Kittens: Can begin solid food at $4\,\text{weeks}$ or earlier. * Standard Weaning: Desirable between $6\,\text{and } 8\,\text{weeks}$ .
Solid Food Transition (Gruel): * Puppies: Mix dry or canned food with water (avoid a sloppy consistency). * Kittens: Gruel mixed at a ratio of $1:2$ (water to dry food) by weight, or $1:5$ (water to dry food) by volume.
Feeding Frequency: * Puppies: Three meals daily until $6\,\text{months}$ of age, then reduced to two meals. * Kittens: Three meals daily until $8\,\text{months}$ of age, then reduced to two meals.

Management of Sick Animals Through Diet

Dietary Objectives: Many diseases respond to dietary changes (amelioration), particularly those affecting the kidneys, heart, gastrointestinal system, and liver.
Chronic Renal Failure: * Associated with high Blood Urea Nitrogen (BUN). * Treatment: Restrict dietary protein and phosphorus; possibly decrease salt. Ensure water access.
Congestive Heart Failure: * Kidneys retain salt due to poor blood flow/pressure; water is retained to balance salt, causing congestion, edema, and ascites (serous fluid in the peritoneal cavity). * Treatment: Restrict dietary sodium.
Gastrointestinal (GI) Disease: * Goals: Reduce organ function while supplying nutrients in easily digestible forms. * Diet: Soft, bland, low-fiber, fairly low-fat. Should contain potassium and highly digestible protein/carbs. * Vomiting: Withhold food (controversial). * Diarrhea: Provide easily digested foods. * Flatulence: Avoid beans, potatoes, root vegetables, milk, high protein, and extra vitamins. * Constipation: Increase exercise and dietary fiber.
Liver Disease: * Treatment: Simple carbohydrates for energy, good-quality protein (milk or egg-based), and low fat.

Special Populations: Working, Geriatric, and Obese Animals

Working Animals (e.g., herding dogs): * Require extra food and plentiful water. * Timing: Do not feed immediately before or after heavy activity. * Environmental Factors: Energy requirements increase in cold weather/winter, especially if housed outside.
Geriatric Animals: * Generally require less nourishment. Overnutrition can lead to degenerative disorders. * Dehydration Risk: Older animals are less sensitive to thirst; tissue dehydration leads to metabolic decline. * Skin Aging: Managed with polyunsaturated fatty acids, brewer's yeast, balanced diet, and exercise. * Musculoskeletal Aging: Managed with vitamin/mineral supplements (balanced Ca/P) and weight reduction.
Obese Animals: * Definition: Excess body fat from converting excess carbohydrates and fats into stored fatty acids. * Health Risks: Shortened lifespan, impaired heart function, decreased respiratory and reproductive efficiency, liver/pancreatic disruption, lower resistance to viral/skin infections, and skeletal stress. * Management: Reduce food intake carefully (especially in pregnancy). Never restrict water intake.", "title": "Comprehensive Guide to Animal Nutrition and Feeding Methods"}