HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Interpretive Summary Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Bascom, S. A. Articles by Van Amburgh, M. Search for Related Content PubMed PubMed Citation Articles by Bascom, S. A. Articles by Van Amburgh, M.

Influence of Dietary Fat and Protein on Body Composition of Jersey Bull Calves¹

S. A. Bascom^*, R. E. James^*,2, M. L. McGilliard^* and M. Van Amburgh

^* Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061-0315
Department of Animal Science, Cornell University, Ithaca, NY 14853

² Corresponding author: jamesre{at}vt.edu

Thirty-nine bull calves between 6 and 9 d of age, were assigned to either baseline slaughter or 1 of 4 diets to determine the influence of dietary fat and protein content, at 2 levels of intake, on growth and body composition changes. Calves were assigned to the following diets a 28.5% protein and 16.4% fat milk replacer [MR; 29/16 (n = 9)], 27.3% protein and 33.4% fat MR [27/33 (n = 8)], 20.6% protein and 20.6% fat MR [20/20 (8)], or whole milk [WM (n = 8)]. Calves fed 27/33, 29/16, and WM received 180 g/d of CP to support 650 g of ADG based on predictions from the 2001 NRC. Calves were fed 3 times daily for 4 wk. Weight, hip height, wither height, heart girth, and body length were measured weekly. Weekly plasma samples were analyzed for plasma urea nitrogen, nonesterified fatty acids, and glucose. A subset of calves from each treatment was killed [29/16 (n = 7), 27/33 (n = 6), 20/20 (n = 6), and WM (n = 5)] at the end of wk 4 of treatment; processed for whole-body analysis of fat, protein, ash, and DM; and compared with baseline slaughter calves to estimate composition of empty BW gain. Calves did not differ in average weekly scour score or medication days. Feed efficiency and ADG were greatest for calves fed WM and least for calves fed 20/20; calves fed 29/16 and 27/33 did not differ. Calves fed 27/33 or WM had the greatest % body fat and gained more grams of fat than calves fed other diets. Calves fed 29/16 or 20/20 had similar % fat in empty body as baseline. Differences in % CP, % ash, or % water in empty body and empty BW gain were not detected. Calves fed 27/33 had a trend toward higher NEFA in wk 1 and 2 than calves fed 29/16 or WM. Growth of calves fed 27/33 and 29/16 were similar except that calves fed 29/16 had lower body fat % than calves fed 27/33. Calves on all diets gained less than predicted by the 2001 NRC.

Key Words: Jersey calf • milk • body composition • milk replacer

This article has been cited by other articles:

				B. T. Velayudhan, K. M. Daniels, D. P. Horrell, S. R. Hill, M. L. McGilliard, B. A. Corl, H. Jiang, and R. M. Akers Developmental Histology, Segmental Expression, and Nutritional Regulation of Somatotropic Axis Genes in Small Intestine of Preweaned Dairy Heifers J Dairy Sci, September 1, 2008; 91(9): 3343 - 3352. [Abstract] [Full Text] [PDF]

				S. R. Hill, K. F. Knowlton, K. M. Daniels, R. E. James, R. E. Pearson, A. V. Capuco, and R. M. Akers Effects of Milk Replacer Composition on Growth, Body Composition, and Nutrient Excretion in Preweaned Holstein Heifers J Dairy Sci, August 1, 2008; 91(8): 3145 - 3155. [Abstract] [Full Text] [PDF]

				K. M. Daniels, S. R. Hill, K. F. Knowlton, R. E. James, M. L. McGilliard, and R. M. Akers Effects of Milk Replacer Composition on Selected Blood Metabolites and Hormones in Preweaned Holstein Heifers J Dairy Sci, July 1, 2008; 91(7): 2628 - 2640. [Abstract] [Full Text] [PDF]