Week 1
Nutrients |
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Nutrient Functions & Requirements
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Text
Transcript
Time: 7.06
Follow along with the audio...
- Feeding standards
- Based on nutrient requirements
- Species and physiological state specific
- National Research Council (NRC)
- Current feeding standards for each species
- Guideline
- Nutrient requirement
- Total amount required for all physiological functions
- Expressed
- Total amount required per day
- Concentration required in the diet
- Amount required
- Functions
- Maintenance
- State in which an animal is neither gaining nor losing nutrients
- Initial reference point
- Growth
- Measured in terms of weight; total or change
- Growth rates
- Figure 2.12 – Average growth curve
- Young > pubescent > mature
- Lactation
- Nutrient requirements are a function of production
- Nutrient balance - short- and long-term balances
- Figure 2.13 – Relationship between production, intake, and body
condition for dairy cow
- Reproduction
- Prior to breeding
- Initial two-thirds of gestation
- Final one-third of gestation
- Work
- Primarily horses
- Figure 2.14 – Horse performing work
- Requirements are a function of work level
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