Fertilizers are more and more imported, and such a fact makes so that the use of treated waste is an economical and sustainable alternative for fodder production. The objective of this study was to evaluate the effect of different doses of bio-fertilizer from birds on forage yield of Brachiaria brizantha (Hochst.) Stapf. The experimental design was completely randomized, with four replications in a factorial arrangement. The first factor consisted of the cultivars Marandu and Piata, while the second factor corresponded to doses of bio-fertilizer from birds (0, 50, 100 and 150 m3 ha-1). The following morphometric aspects were evaluated: plant height (PH), leaf blade length (LBL), leaf blade width (LBW) at 15, 30, 45 and 60 days after emergence (DAE) and green and dry matter (GM and DM, respectively), stem and roots at 60 DAE. The dose of 50 m3 ha-1of bio-fertilizers from birds promoted increasing morphometric characteristics and forage yield of cultivars Marandu and Piatã, while doses of 100 and 150 m3 ha-1caused the death of these cultivars.
aviculture; Marandu cultivar; Piatã cultivar; pasture