11:067:330 Lecture Notes - Lecture 17: Dairy Cattle, Indirect Calorimetry, Semen Collection

• School: Rutgers University
• Department: Animal Science
• Course: 11:067:330
• Professor: P Stark

Document Summary

Maintenance e requirement amount of dietary e needed to maintain an animal in 0 e balance. Amount of e consumed in feed = amount of e uses to maintain animal (heartbeat, kidney function, etc) Maintenance protein requirement amount of protein needed to maintain animal in 0 nitrogen balance. Concept of maintenance really only applies to mature, non-pregnant, non-lactating animals nonproductive animals. Ex: male used for semen collection only. Majority of animals are productive, not at maintenance: more or a concept to describe basic nutrition needs. Maintenance feed requirements have major effect on efficiency of feed utilization. In productive animals, >40% of e intake is used to support maintenance. Comparing partitioning of total net e intake between production and maintenance above. 600 kg lactating dairy cow producing 40 kg/d of milk consumes about 40 mcal of e daily. 25% used for maintenance and 75% used for production of milk high rate of efficiency. 500 kg growing beef steer gaining 1. 4 kg/d.