Molecular structure, chemical and nutrient profiles, and metabolic characteristics of the proteins and energy in new cool-season corn varieties harvested as fresh forage for dairy cattle
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To our knowledge, no previous research exists concerning the molecular structure and metabolic characteristics of the proteins and energy that new cool-season corn varieties provide for dairy cattle. The objectives of this study were to identify the differences in the molecular structures of proteins among several new cool-season corn varieties [Pioneer P7443R, Pioneer P7213R, Pioneer P7535R (Pioneer Hi-Bred International Inc., Johnston, IA), Hyland Baxxos RR, Hyland SR22, and Hyland SR06 (Hyland Seeds, Blenheim, ON, Canada)] using Fourier transform infrared attenuated total reflectance (FT/IR-ATR) molecular spectroscopy, and to determine the nutrient profile and supply that each variety provided for dairy cattle. The protein molecular structure studies showed that the amide I to amide II ratio ranged from 1.09 to 1.66 and that the α-helix to β-sheet ratio ranged from 0.95 to 1.01 among the new cool-season corn varieties. Energy content was significantly different among the new varieties. We found significant differences in the protein and carbohydrate subfractions and in the ruminal degradation kinetics of the organic matter, crude protein, starch, and neutral detergent fiber of the new varieties. The new varieties had similar estimated intestinal digestibilities for rumen undegraded crude protein. However, the new varieties had significant differences in predicted total truly absorbable protein, ranging from 39 to 57 g/kg of dry matter, indicating that these newly developed varieties are satisfactory sources of truly absorbed protein for dairy cattle. Further study on the molecular structure profiles of cool-season corn in relation to its nutrient utilization and availability in dairy cattle is necessary.
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Nutritive value of maize silage in relation to dairy cow performance and milk quality
Khan, N. A., Yu, P., Ali, M., Cone, J. W., & Hendriks, W. H. (2015) · Journal of the Science of Food and Agriculture · doi:10.1002/jsfa.6703 · Cited by 251 · see citing works
Self-citation
- Authors
- Abeysekara, S., Christensen, D. A., Niu, Z., Theodoridou, K., & Yu, P.
- Affiliations
- University of Saskatchewan (CA)
- Tianjin Agricultural University (CN)
- Corresponding author
- Yu, Peiqiang
- Venue
- Journal of Dairy Science
- Publisher
- American Dairy Science Association
- Published
- 2013-10
- Volume
- 96
- Issue
- 10
- Pages
- 6631-6643
- ISSN
- 0022-0302 (ISSN-L)
- OpenAlex
- W2057464223
- Cited by
- 31
- References
- 2
- Citations by year
- 2025: 3 · 2024: 1 · 2023: 1 · 2021: 1 · 2020: 2 · 2019: 1 · 2018: 3 · 2017: 9 · 2016: 5 · 2015: 4 · 2014: 1
- FWCI
- 7.08
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Journal of Dairy Science (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Agriculture Strategic Research Chair Program
- Saskatchewan Agricultural Development Fund
- Topics
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Ruminant Nutrition and Digestive Physiology
- Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Crop Yield and Soil Fertility
- Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
- Keywords
- protein structure, protein digestibility, energy content, starch, neutral detergent fiber, maize varieties
- MeSH terms
- Animals, Animal Feed, Animal Nutritional Physiological Phenomena, Cattle, Zea mays, Dietary Proteins, Energy Metabolism, Kinetics, Rumen, Seasons, Starch, Molecular Structure, Protein Structure, Secondary, Spectroscopy, Fourier Transform Infrared
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