Abstract
ABSTRACT The objective of this two-year study was to evaluate live weight gain per animal and per area and their relationships with the characteristics of BRS Ipypora (Brachiaria ruziziensis × Brachiaria brizantha) and Marandu (Brachiaria brizantha) pastures. A completely randomized block design was used with two treatments and four replicates. The grazing method was rotational stocking, with variable stocking rate. Stocking rate was adjusted twice a week during the grazing period (six or seven days) and post-grazing canopy height target [...]
Highlights
Despite the significant efforts of Brazilian research institutions to release grass cultivars, with traits that contribute to greater animal production efficiency, the number of cultivars effectively used is still small
Total forage accumulation (TFA), forage accumulation rate (FAR), canopy height (CH), and stem (SP) and dead material (DMP) percentages of Ipyporã grass were lower compared with Marandu, in pregrazing condition (Table 1)
Leaf percentage (LP) and leaf:stem ratio (LSR) were greater for Ipyporã pastures compared with those for Marandu
Summary
Despite the significant efforts of Brazilian research institutions to release grass cultivars, with traits that contribute to greater animal production efficiency, the number of cultivars effectively used is still small. According to Valério and Koller (1993), chemical control has both ecological and economic limitations; the use of resistant cultivars is the best alternative to control this pest In this context, the interspecific hybrid of Brachiaria BRS Ipyporã was developed by crossing a genotype of B. ruziziensis and an accession of B. brizantha, with the objective of introgressing resistance to spittlebugs in the new cultivar (MAPA, 2015). Valério et al (2011, 2012) evaluated the resistance of Brachiaria spp. hybrids to the following species of spittlebugs: Notozulia entreriana, Deois flavopicta, Mahanarva fimbriolata, and Mahanarva sp They observed a high level of antibiosis in BRS Ipyporã, with low percentages of spittlebug survival and prolonged nymphal periods, which indicate the inadequacy of this cultivar as a host plant for these pests. Marandu palisadegrass has presented resistance to attack of these species of spittlebugs, but this cultivar is not resistant to the insects of the Mahanarva genus (Valério, 2009)
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