Forage potential of Thinopyrum intermedium through near‐infrared spectrometry and grown in mixture with various legumes

• Published in: Grass and forage science Vol. 79; no. 4; pp. 557 - 570
• Main Authors: Fagnant, Laura, Duchene, Olivier, Bindelle, Jérôme, Beckers, Yves, Decruyenaere, Virginie, Dumont, Benjamin
• Format: Journal Article Web Resource
• Language: English
• Published: Oxford Wiley Subscription Services, Inc 01.12.2024; Wiley; Blackwell
• Subjects: Agricultural sciences; Agriculture & agronomie; Agriculture & agronomy; Agronomy; Animal feed; Biomass; biomass production; Breeding; Cattle feeds; Chemical composition; Crop production; Dairy cattle; Digestibility; energy content; Environmental services; feeds; Forage; forage composition; Forage evaluation; forage yield; Grain; Grasses; Growing season; Infrared spectroscopy; Intermediate wheatgrass; Kernza; Legume intercropping; Legumes; Life Sciences; Mixtures; Near infrared radiation; Parameters; Perennial grain; perennial grasses; phenology; Plant breeding; prediction; Protein composition; Sciences du vivant; Scientific imaging; Spectrometry; spectroscopy; straw; Thinopyrum intermedium; Thinopyrum intermedium subsp. intermedium; forage evaluation; intermediate wheatgrass; Kernza; perennial grain; Thinopyrum intermedium; legume intercropping
• DOI: 10.1111/gfs.12684
• ISSN: 0142-5242; 1365-2494

Intermediate wheatgrass [IWG; Thinopyrum intermedium (Host) Barkworth & D.R. Dewey] is a perennial grass, dual‐purpose crop that can provide environmental services. In addition to the grain production, assessing its forage potential is crucial. We developed models for near‐infrared (NIR) spectrometry prediction of the chemical composition and digestibility of IWG across various experimental sites. Among these, a Belgian field was used to compare its dual production in pure stands or in mixture with legumes. Good quality NIR predictions were observed, offering an efficient tool to characterize the forage composition of IWG. Its forage parameters were mainly influenced by the phenological stage with an increase of fiber and a decrease of protein, digestibility, and energy content (NEL) during the growing season. IWG forage at vegetative stages could be used to feed lactating dairy cattle with a NEL of 1625 kcal kg−1 of DM but, its biomass was low averaging 1.8 t of DM ha−1. At grain maturity, biomass was higher (i.e., 5.3 t of DM ha−1), representing 73%–92% of the total biomass production, and could replace straw in high‐starch dairy diets with a NEL averaging 849 kcal kg−1 of DM. Although the mixture of IWG with legumes enhanced some forage parameters, its value as animal feed was not improved. In mixture, we observed a tradeoff between the increase of the forage yield and the reproductive potential of IWG. These insights can inform the on‐going process of breeding and help farmers to design relevant systems to experiment this new crop.