Relação temporal de componentes morfológicos e composição química em plantas da caatinga, Serra Talhada – PE

Abstract

This study aimed to characterize bromatological and morphological components (leaves and stems) of some native plants during different periods of the year. Samples were collected at the farm located in San Miguel Serra Talhada PE. In Caatinga area grazed by sheep throughout the year. The samples were collected at intervals of approximately 45 days, from January to August 2011, totaling five evaluation. The evaluated the following species were: Catingueira (Caesalpinia pyramidalis Tui.), Jurema preta (Mimosa hostilis Benth.), Mororó (Bauhinia cheilantha), Marmeleiro (Cydonia oblonga), Malva branca (Sida cordifolia), Orelha de onça (Macroptilium martii), Capa bode (Ipomeae carnea Jacq.) e Pereiro (Aspidosperma pyrifolium). Sampling was conducted simulating grazing animals, collecting leaves and branches separately, three random samples from each species were collected, consisting of plant material with approximately 2 mm thick and picked up to 1.5 m tall. Average CP observed for the evaluated species were above the critical limits described by the literature for leaf fraction (10.5%) however, CP for the branch fraction was 4.4%. Ashes presented higher overall average of species for leaf fraction (7.7%) compared with the branch fraction (5.6%). There was an increase in the fraction of NDF throughout the research, which showed overall average among species ranged from 46.2 and to 67.1% from January and to August 2011, respectively. In variable tannin there was also an increase during the search among the plants studied. During the year, the chemical composition and tannin content of these forages undergo variations, which can interfere with the quality of these plants and consequently in animal feed.