Title page for ETD etd-07282008-135549

Type of Document Dissertation
Author Tomlinson, Dana J
URN etd-07282008-135549
Title Effect of nonstructural carbohydrates and rumen undegradable protein on intake, growth, and body condition of dairy heifers
Degree PhD
Department Animal Science (Dairy)
Advisory Committee
Advisor Name Title
James, Robert E. Committee Chair
McGilliard, Michael L. Committee Member
Stallings, Charles C. Committee Member
Vinson, William E. Committee Member
  • Rumen
Date of Defense 1990-05-12
Availability restricted
One hundred and eight Holstein dairy heifers were divided into two weight blocks based

on beginning body weight (x = < 182 kg, light, > 270 kg, heavy). Heifers within weight

blocks were randomly assigned to one of five, treatments. Treatments consisted of three

levels of NDF (35%, 45%, 55%) at 100% of NRC TDN recommendation, and three

levels of TDN (85%, 100%, 115 of NRC) at 45% NDF for light heifers. For heavy

heifers, treatments consisted of three levels of NDF (40%,,50%, 60%) at 100% NRC

TDN, and three treatments with similar levels of TDN at 50% NDF. Heifers were fed

total mixes rations of corn silage,, alfalfa haylage, ground orchardgrass hay, soybean

meal, high moisture corn and a mineral mix formulated for 0.68 kg ADG., Mean gains

(kg/d) were 1.07 and .96 for the light and heavy blocks, respectively. DMI as a percent

of BWT differed across NDF levels for light heiferi(i-= 2.96, 2.56, 2.57, 2.57, and 2.87

% of BWT for the low,, med., high NDF, and low, high TDN treatments, respectively).

Heavy heifer DMI% did not differ (Z= 2.45, 2A0, 2.24, 2.15, and 2.42 % of BWT for low, med., and high NDF, and low, high. TDN treatments, respectively). Equations to

predict DMI were developed using intake information from this and a previous study.

Backward stepwise regression was utilized to generate a simplified model. Model selected

was: DMI (kg/d) = -5.9781 + (2.2120E-05 * BWTSQ) - (5.5527 * GAIN) +

(2.7837 * GAINSQ) + (0.4668 * NDF) + 5.3930 * NDFSQ) + (0.03285 * DM) +

(7.7859E-03 * BWT * GAIN); n = 514, r2 = .67.

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