Investigation of the Spectroscopic Information on Functional Groups Related to Carbohydrates in Different Morphological Fractions of Corn Stover and Their Relationship to Nutrient Supply and Biodegradation Characteristics.
The objectives of this study were to investigate (1) nutritive values and biodegradation characteristics and (2) mid-IR spectroscopic features within the regions associated with carbohydrate functional groups (including cellulosic component (CELC), structural carbohydrate (STCHO), and total carbohydrate (CHO)) in different morphological fractions of corn stover. Furthermore, correlation and regression analyses were also applied to determine the relationship between nutritional values and spectroscopic parameters. The results showed that different morphological sections of corn stover had different nutrient supplies, in situ biodegradation characteristics, and spectral structural features within carbohydrate regions. The stem rind and ear husk were both high in fibrous content, which led to the lowest effective degradabilities (ED) among these stalk fractions. The ED values of NDF were ranked ear husk > stem pith > leaf blade > leaf sheath > whole plant > stem rind. Intensities of peak height and area within carbohydrate regions were relatively more stable compared with spectral ratio profiles. Significant difference was found only in peak area intensity of CELC, which was at the highest level for stem rind, followed by stem pith, leaf sheath, whole plant, leaf blade, and ear husk. Correlation results showed that changes in some carbohydrate spectral ratios were highly associated with carbohydrate chemical profiles and in situ rumen degradation kinetics. Among the various carbohydrate molecular spectral parameters that were tested in multiple regression analysis, CHO height ratios, and area ratios of CELC:CHO and CELC:STCHO as well as CELC area were mostly sensitive to nutrient supply and biodegradation characteristics in different morphological fractions of corn stover.
College of Animal Science and Technology, Northeast Agricultural University , Harbin 150030, China.
Hangshu
http://orcid.org/0000-0003-4180-2272
H
Xin
College of Animal Science and Technology, Northeast Agricultural University , Harbin 150030, China.|Gushi Agriculture & Animal Husbandry Group Company, Ltd. , Harbin 150078, China.
Xue
X
Ding
College of Animal Science and Technology, Northeast Agricultural University , Harbin 150030, China.
Liyang
L
Zhang
Institute of Animal Husbandry of Heilongjiang Academy of Agricultural Sciences , Harbin 150086, China.
Fang
F
Sun
College of Animal Science and Technology, Northeast Agricultural University , Harbin 150030, China.
Xiaofan
X
Wang
College of Animal Science and Technology, Northeast Agricultural University , Harbin 150030, China.
Yonggen
Y
Zhang
D000821:Animal Feed / Q000032:analysis; D001673:Biodegradation, Environmental; D002241:Carbohydrates / Q000032:analysis*; D004040:Dietary Carbohydrates / Q000032:analysis; D009753:Nutritive Value; D018515:Plant Leaves / Q000737:chemistry / Q000254:growth & development; D013057:Spectrum Analysis; D003313:Zea mays / Q000737:chemistry* / Q000254:growth & development
D002241:Carbohydrates; D004040:Dietary Carbohydrates
carbohydrate; corn stover; molecular structural; morphological fractions; nutritive values; relationship