Effect of Exogenous Fibrolytic Enzymes Supplementation or Functional Feed Additives on In Vitro Ruminal Fermentation of Chemically Pre-Treated Sunflower Heads

Jihene Jabri, Hajer Ammar, Khalil Abid, Yves Beckers, Héla Yaich, Atef Malek, Jamel Rekhis, Amr Salah Morsy, Yosra Ahmed Soltan, Walid Soufan, Mohamad Isam Almadani, Mireille Chahine, Mario E. de Haro Marti, Mohammad K. Okla and Mohamed Kamoun
Additional contact information
Jihene Jabri: Animal Nutrition Laboratory, Ecole Nationale de Médecine Vétérinaire, Université de la Manouba, Sidi Thabet 2020, Tunisia
Hajer Ammar: Ecole Supérieure d’Agriculture de Mograne, Zaghouan 1121, Tunisia
Khalil Abid: Animal Nutrition Laboratory, Ecole Nationale de Médecine Vétérinaire, Université de la Manouba, Sidi Thabet 2020, Tunisia
Yves Beckers: Laboratories Precision Livestock and Nutrition, Gembloux Agro-Bio Tech, University of Liège, 4000 Liège, Belgium
Héla Yaich: Animal Nutrition Laboratory, Ecole Nationale de Médecine Vétérinaire, Université de la Manouba, Sidi Thabet 2020, Tunisia
Atef Malek: Animal Nutrition Laboratory, Ecole Nationale de Médecine Vétérinaire, Université de la Manouba, Sidi Thabet 2020, Tunisia
Jamel Rekhis: Animal Nutrition Laboratory, Ecole Nationale de Médecine Vétérinaire, Université de la Manouba, Sidi Thabet 2020, Tunisia
Amr Salah Morsy: Livestock Research Department, Arid Lands Cultivation Research Institute, City of Scientific Research and Technological Applications, Alexandria 21934, Egypt
Yosra Ahmed Soltan: Animal and Fish Production Department, Faculty of Agriculture, Alexandria University, Alexandria 21516, Egypt
Walid Soufan: Plant Production Department, College of Food and Agriculture Sciences, King Saud University, Riyadh 11451, Saudi Arabia
Mohamad Isam Almadani: Thünen Institute of Farm Economics, Bundesallee 63, 38116 Braunschweig, Germany
Mireille Chahine: Department of Animal, Veterinary and Food Sciences, University of Idaho, Moscow, ID 83844, USA
Mario E. de Haro Marti: Gooding County Extension, College of Agricultural and Life Sciences, University of Idaho, 203 Lucy Lane, Gooding, ID 83330, USA
Mohammad K. Okla: Botany and Microbiology Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
Mohamed Kamoun: Animal Nutrition Laboratory, Ecole Nationale de Médecine Vétérinaire, Université de la Manouba, Sidi Thabet 2020, Tunisia

Agriculture, 2022, vol. 12, issue 5, 1-16

Abstract: This study aims to provide possible utilization of sunflower head byproduct (SFH) as a feedstuff by implementing chemical pretreatments (4% sodium hydroxide (SFH NaOH ) or 4% urea (SFH urea ) and supplementation with either exogenous fibrolytic enzymes (EFE) or functional feed additive (FFA). The experimental EFE was a complex (1:1, v / v ) of two enzyme products with high activity of β-1,3-1,4-glucanase and endo-1,4-β-D-xylanase and applied at 0 (SFH out ), 1, 2, 5, and 10 µL/ gdry matter, while FFA was a fermentation byproduct rich in cellulase and xylanase activities, applied at 0 (SFH out ), 0.5, 1, 2, and 4 mg/g DM. SFH urea had the highest ( p < 0.05) crude protein (CP) content compared to other SFH substrates. Linear enhancements ( p < 0.05) in kinetics of gas production (GP), metabolizable energy (ME), organic matter digestibility (OMD) and total short-chain fatty acids (SCFAs) concentrations were observed for all SFH substrates supplemented with EFE. The SFH out had the highest ( p < 0.05) potential GP, maximum rate (Rmax) of GP, ME, OMD and SCFAs. Supplementation of EFE was more pronounced than FFA in affecting the kinetic parameters of in vitro GP for all SFH substrates. SFH out supplemented with EFE seems to be the most promising substrate to enhance microbial fermentation in vitro.

Keywords: sunflower head; chemical composition; digestibility; in vitro; chemical pretreatments; exogeneous enzymes; feed additive (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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