Title page for ETD etd-11202012-040155


Type of Document Master's Thesis
Author Richardson, Donna Renee
URN etd-11202012-040155
Title Verification of equations to predict dry matter intake of dairy heifers
Degree Master of Science
Department Dairy Science (Management)
Advisory Committee
Advisor Name Title
James, Robert E. Committee Chair
McGilliard, Michael L. Committee Member
Polan, Carl E. Committee Member
Vinson, William E. Committee Member
Keywords
  • Ingestion
Date of Defense 1987-12-05
Availability restricted
Abstract

Diets of varying forage base were fed to dairy heifers to test the accuracy of an prediction equation to accurately predict dry matter intake (DMI). Heifers ranging from 120 to 430 kg body weight, were randomly assigned to treatments with forage bases of 1) 100% corn silage, 2) 75% corn silage : 25% alfalfa haylage, 3) 50 % corn silage : 50% alfalfa haylage, or 4) 25% corn silage : 75% alfalfa haylage. Diets were fed for an average of 187 days. Rations were formulated to meet NRC requirements for .68 kg ADG and reformulated monthly. Animals consistently gained an average of .8 kg per day. Statistical analysis showed actual DMI to be significantly less than predicted levels of DMI. The correlation coefficient of actual DMI to predicted DMI was .59. In spite of icreased rates of gain, differences due to treatment, ration acid detergent fiber (ADF) and season were not significant. Depressed intake may be the result of metabolic control of intake as ADG approaches .8 kg. This suggests that current recommendations for TDN may be excessive for dairy heifers reared in confinement.

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