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- Title
Gas exchange, chemical composition and productive characteristics of tropical grasses deferred II: cultivars BRS Paiaguás and BRS Piatã.
- Authors
SANTOS, Francisca Gisele Rodrigues dos; ARAÚJO, Ricardo Alves de; CÂNDIDO, Magno José Duarte; ROGÉRIO, Marcos Cláudio Pinheiro; COSTA, Clésio dos Santos; SILVA, Valdson José da; FURTADO, Rafael Nogueira; POMPEU, Roberto Cláudio Fernandes Franco
- Abstract
This study aimed to evaluate the physiological parameters, the productive characteristics, structural and chemical composition of Urochloa Brizantha cultivars BRS and BRS Piatã submitted to two deferment periods and three using times. The experimental design was randomized complete block design in a factorial scheme 2 x 2 x 3, being two grass cultivars (Paiaguás grass and Piatã grass), two deferment periods (rainy season and dryrainy transition) and three sealing times (40, 80 and 120 days). It was observed that, in the rainy season, the grasses had higher leaf transpiration rate when used for 40 days of deferment (1.66 μmol m²/s). During the rainy season, the Stomatal conductance was detected only in the grasses used with shorter seal, with an average of 0.07 μmol m²/s. In contrast, in the period of transition, the concentration decreased to 0.02 μmol m²/s. In a general way, the BRS Paiaguás presented lower content of NDF. The shorter cycle provided greater biomass production of total forage during the period of rain, approximately 2.78 times more than the same pasture grass deferred during the transition period. Generally, the periods of deferment and moments of use cause effects on structural characteristics of pasture, being that the period of deferment of the transition period and used for 40 and 80 days may be a strategy for keeping animals in critical periods.
- Subjects
BIOMASS production; SIGNALGRASS; FACTORIAL experiment designs; GRASSES; BLOCK designs; CULTIVARS
- Publication
Revista Brasileira de Saúde e Produção Animal (RBSPA), 2021, Vol 22, Issue 1, p1
- ISSN
1519-9940
- Publication type
Article
- DOI
10.1590/S1519-99402122162021