Fixed versus variable rest period effects on herbage accumulation and canopy structure of grazed Tifton 85 and Jiggs Bermuda grass - Pedreira, Carlos Guilherme Silveira; Silva, Valdson José da; Guimarães, Murilo Saraiva; Pequeno, Diego Noleto Luz; Tonato, Felipe (Pesquisa Agropecuária Brasileira, 2018)