Researching rumen degradation behaviour of protein by FTIR spectroscopy

https://doi.org/10.17221/7908-CJASCitation:Liu D., Wu P., Jiao P. (2015): Researching rumen degradation behaviour of protein by FTIR spectroscopy. Czech J. Anim. Sci., 60: 25-32.
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The objectives of the present study were: (1) to detect protein secondary structures using the Fourier transform infrared spectroscopy (FTIR), and (2) to investigate the relationship between protein secondary structures and their rumen degradation kinetics in dairy cattle. The study was carried out using FTIR to estimate protein molecular structure of eight different types of samples, such as soybean meal, cottonseed meal, rapeseed meal, distilled dried grains with solubles, and corn. Nutritive values of these samples were determined using the Cornell Net Carbohydrate and Protein System. The results showed that: (1) different feed protein sources had different percentages and ratios of α-helixes and β-sheets in their protein secondary structures, (2) the higher protein α-helix to β-sheet ratio resulted in lower PB3 and PC, and higher PB1 and PB2 in the feeds, and (3) the α-helix to β-sheet ratio of the rumen degradation residues was changed along with the rumen degradation.
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