Protein Nutrition of Dairy Cows During the Transition Period

Prepartum DMI, BCS, and BW did not differ significantly. Cows fed AMP postpartum tended (P = 0.10) to produce more 4% fat-corrected milk (FCM) than SB-fed cows (33.8 vs 31.8 kg/d). Gross efficiency (FCM/DMI) was greater (P < 0.05) for the cows fed AMP postpartum than for cows fed SB (1.88 vs 1.70). An interaction of postpartum diet by week (P < 0.05) indicated that cows fed AMP postpartum lost more BW than did cows fed SB. Postpartum concentrations of total protein and beta-hydroxybutyric acid in plasma were elevated for cows fed AMP compared to SB-fed cows (P < 0.05). Hepatic concentrations of total lipid, triglyceride, and glycogen did not differ in either the prepartum or postpartum periods. Feeding higher amounts of MP or feeding AMP in the prepartum period did not improve lactation performance. However, gross efficiency was improved by supplementation of AMP during lactation.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Animal Sciences

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Underwood, John Paul

Contributors dc:contributor

• Drackley, James K.

• Agriculture, Animal Culture and Nutrition

Language dc:language

eng

Identifier

(MiAaPQ)AAI3101984

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/83561