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Cited by 226Ruminant Nutrition and Digestive PhysiologyAnimal Nutrition and PhysiologyAnimal health and immunology

Growth and body composition of dairy calves fed milk replacers containing different amounts of protein at two feeding rates1

Bartlett, K. S., McKeith, F. K., VandeHaar, M. J., Dahl, G. E., Drackley, J. K.·2006·Journal of Animal Science
DOI 10.2527/2006.8461454x
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Abstract

Previous research has demonstrated that increasing the CP concentration from 16 to 26% in milk replacers fed to male preruminant dairy calves at 1.5% of BW (DM basis) daily resulted in increased ADG, G:F, and deposition of lean tissue. However, the effects of dietary CP would be expected to vary depending on ME intake. Here, male Holstein calves < 1 wk old were used to determine the effects of feeding rate and CP concentration of isocaloric, whey protein-based milk replacers on growth and body composition. After a 2-wk standardization period, calves were assigned randomly to an initial baseline group or to treatments in a 2 x 4 factorial arrangement of feeding rate (1.25 or 1.75% of BW daily, DM basis) and milk replacer CP concentration (14, 18, 22, or 26% of DM). No starter was offered, but calves had free access to water. After a 5-wk feeding period, calves were slaughtered and body composition was determined. Increasing the feeding rate increased (P < 0.05) ADG, G:F, empty-body gains of chemical components and energy, the percentage of fat in empty BW gain and in the final empty body, and concentrations of IGF-I and insulin in plasma. Increasing the feeding rate decreased (P < 0.01) percentages of water and protein in the empty body and decreased urea N in plasma. Increasing dietary CP concentration linearly increased (P < 0.05) ADG, body length, heart girth, and gains of water and protein but linearly decreased (P < 0.05) fat gain. As dietary CP increased, fat content in empty body gain decreased, and water and protein increased. Increasing CP concentration increased (quadratic, P < 0.02) G:F, with greatest efficiencies for calves fed 22% CP. Gross energetic efficiency (retained energy:intake energy) was greater (P < 0.05) for calves fed at 1.75% of BW daily. Efficiency of dietary protein use for protein gain was greater for calves fed at 1.75% of BW daily but was not affected by dietary CP. The ratio of protein gain to apparently digestible protein intake above maintenance decreased as dietary CP increased. Interactions (P < 0.05) of feeding rate and CP concentration for gains of water and protein indicated that when dietary CP was 26% the ME supply limited protein use by calves fed at 1.25% of BW daily. Body composition of preruminant calves can be markedly altered by manipulating the protein to energy ratio in milk replacers. These dietary effects on body composition and growth are not predicted by current NRC standards.

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Authors
Bartlett, K. S., McKeith, F. K., VandeHaar, M. J., Dahl, G. E., & Drackley, J. K.
Affiliations
  • University of Illinois Urbana-Champaign (US)
  • Michigan State University (US)
Corresponding author
Drackley, J. K.
ORCID
Venue
Journal of Animal Science
Publisher
Oxford University Press (OUP)
Published
2006-06-01
Volume
84
Issue
6
Pages
1454-1467
ISSN
  • 0021-8812 (ISSN-L)
  • 1525-3163
DOI
10.2527/2006.8461454x
OpenAlex
W1531733758
Cited by
226
References
34
Citations by year
2026: 7 · 2025: 5 · 2024: 8 · 2023: 9 · 2022: 17 · 2021: 15 · 2020: 12 · 2019: 14 · 2018: 13 · 2017: 10 · 2016: 11 · 2015: 14 · 2014: 8 · 2013: 15 · 2012: 16
FWCI
21.41
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Animal Science (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
  • Health Sciences › Veterinary › Small Animals › Animal health and immunology
Keywords
dairy calves, milk replacer, dietary crude protein, feeding rate, growth performance, body composition, protein efficiency, insulin-like growth factor I, insulin, urea nitrogen, fat deposition, Holstein calves, whey protein, empty body composition, apparent protein digestibility, isocaloric diet, preruminant calves
MeSH terms
Animals, Animal Feed, Animal Nutritional Physiological Phenomena, Animals, Newborn, Body Composition, Body Weight, Cattle, Diet, Dietary Proteins, Male, Milk, Nutritional Requirements

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