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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0899    [Accepted] Published online March 4, 2020.
Effect of extrusion of soybean meal on feed spectroscopic molecular structures and on performance, blood metabolites and nutrient digestibility of Holstein dairy calves
Ammar Mollaei Berenti1  , Mojtaba Yari1,*  , Saeed Khalaji1  , Mahdi Hedayati1  , Peiqiang Yu2 
1Department of Animal Science, College of Agriculture, Malayer University, Malayer 65719–95863, Iran, Malayer, Iran
2Department of Animal and Poultry Science, University of Saskatchewan, Saskatoon, Canada, Saskatoon, Canada
Correspondence:  Mojtaba Yari, Tel: +9809124479406, Fax: +9802122221215, Email: m.yari@malayeru.ac.ir
Received: 26 November 2019   • Revised: 21 January 2020   • Accepted: 26 February 2020
Performance and physiological responses of dairy calves may change by using extruded soybean meal (ESBM) instead of common soybean meal (SBM) in starter feed. The aims of the current study were 1) to determine the effect of extrusion processing of SBM on protein electrophoretic size, fourier transform infrared spectroscopy (FTIR) structures and CNCPS protein sub-fractions and 2) to determine the effect of substitution of SBM with ESBM in starter feed of Holstein heifer calves during pre and post-weaning on performance, nutrient digestibility, and blood metabolites.
The SBM was substituted with ESBM at the level of 0, 25, 50, 75 and 100 % (DM basis). Fifty heifer calves (initial body weight 40.3±0.63 kg) were used for the study. After birth, animals were fed colostrum for 3 days and then they were fed whole milk until weaning. Animals had free access to starter feed and water during the study.
Extrusion of SBM decreased electrophoretic protein size and increased rapidly degradable true protein fraction, changed FTIR protein and amide II region. With increasing level of ESBM in the diet, starter intake increased quadratically during the pre-weaning period (p < 0.05) and body weight, DM intake and average daily gain increased linearly during the post-weaning and the whole study period (p < 0.05). Dry matter and CP digestibilities at week 14 and blood glucose and BHBA increased linearly in calves as the level of ESBM increased in the diet (p < 0.05).
Dairy calves performance and physiological responses were sensitive to SBM protein characteristics including electrophoretic size, FTIR structures and CNCPS protein fractions.
Keywords: Amides; Calves; Performance; Protein Digestibility; Rumen

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