Resumen

GONZALEZ-RONQUILLO, Manuel; APARICIO, Rafael; TORRES, René  y  DOMINGUEZ VARA, Ignacio A. Forage production, chemical composition and in vitro gas production of the vegetation of a modulated seasonal savanna. Zootecnia Trop. [online]. 2009, vol.27, n.4, pp.407-417. ISSN 0798-7269.

In order to characterize forages from a modulated seasonal Savanna. Determination of forage dry matter yield production (Mg ha^-1year), Crude protein (CP), Neutral detergent fiber (NDF), Acid detergent fiber (ADF) and Lignin (ADL), and in vitro gas production to determine the fermentability and degradability in native forage samples taken in four seasons of the year: Drought, Drought-Rainy Transition (DRT), Rainy and Rainy-DroughtTransition (RDT) and three physiographical units (Bank, Sandbank and Tideland) was made in a modulated seasonal savanna in the state of Apure. Venezuela. Pastures performance results varied (P≤0,01) in function to year’s seasons and physiographical units, where the lower offer was in DRT and Drought seasons in comparison to RDT and Rainy (1,2 and 1,8 vs 3,5 and 3,0 Mg DM ha^-1year), in Sandbank unit was lower (P≤0,01) thanTideland and Bank: 1,8; 2,10 and 2,4 Mg DM ha^-1 year^-1, respectively. CP content (g 100 g) was higher (P ≤ 0,01)in DRT season (11,84) than the rest (6,6±1,1), in the physiographical units there was no difference (P ≥0,05). The in vitro gas production (ml gas g DM) was in Rainy season (156,89), proceeded by DRT (148,47) with a difference (P≤0,01) respecting to Drought and RDT, in Tideland it was increased (P≤0,05)(139,10) respecting to Bank (131,58) and Sandbank (131,80). These results from the usage for a savanna management, the grazing must be done from December to April (Drought) in the Tideland, from May to June (DRT) in the Sandbank, from July to September (Rainy) in the Bank, and September up to November (RDT) in Sandbank unit. It is desirable to consider the forage yield and nutritive quality of the forage for a better usage it

Palabras clave : chemical composition; digestibility; forages; modulated savanna; savannas; season; In vitro gas production; forage yield.

        · resumen en Español     · texto en Español     · Español ( pdf )