Title page for ETD etd-11202012-040155
|Type of Document
||Richardson, Donna Renee
||Verification of equations to predict dry matter intake of dairy heifers
||Master of Science
||Dairy Science (Management)
|James, Robert E.
|McGilliard, Michael L.
|Polan, Carl E.
|Vinson, William E.
|Date of Defense
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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