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Mefluidide Effects on Smooth Brome Composition and Grazing Cow-Calf Performance^1,2,

University of Nebraska, Lincoln 68583-0908

Abstract

Mefluidide, a plant growth regulator, was evaluated in two cow-calf grazing trials and one herbage trial on smooth brome (Bromus inermis) pastures stocked at recommended densities in eastern Nebraska. Mefluidide-treated pasture increased cow and calf production during August of 1982 (P=.03) and calf production was greater during July of 1983 (P=.09). Mefluidide-treated smooth brome pastures increased calf production over the 1982 grazing season (P=.11) and cow gain over the 1982 (P=.12) and 1983 grazing seasons (P=.13). Mefluidide decreased neutral detergent fiber (NDF) content and increased crude protein content of smooth brome during both years (P<.05), and increased in vitro dry matter disappearance (IVDMD) in 1982 (P<.05). In ungrazed smooth brome, mefluidide treatment appeared to shift dry matter production to green leaves from green stem and brown leaf and stem fractions. Cell wall components [NDF, acid detergent fiber (ADF) and lignin] of green leaves were not affected significantly by mefluidide treatment, although green stems treated with mefluidide were lower in ADF and lignin (P<.05).

¹ Supported in part by 3M Agricultural Products.

² Published as Paper No. 7960, Journal Ser., Nebraska Agr. Exp. Sta.

³ Dept. of Anim. Sci.

⁴ Dept. of Agron.