Author: ANDRES GILBERTO LIMAS MARTINEZ
JONATHAN RAUL GARAY MARTINEZ SANTIAGO JOAQUIN CANCINO BENIGNO ESTRADA DROUAILLET JUAN CARLOS MARTINEZ GONZALEZ ANDRES GILBERTO LIMAS MARTINEZ JAVIER HERNANDEZ MELENDEZ ADELAIDO RAFAEL ROJAS GARCIA (2019)
Dry matter production (DM) and morphological composition were evaluated according to regrowth age (RA; four, six,
and eight weeks) and prairie height (PH) in Pennisetum ciliare cv. H-17, during rainy season (RS) and drought (DS). The variables were total MS (TDM), leaf (LDM), stem (SDM), dead material (DMDM) and PH. A completely randomized design with four repetitions and linear regression analysis was used. During RS, the TDM was similar (p > 0.05) between RA (8342 kg ha-1) and decreased 90% in DS.
El pasto Insurgente (Brachiaria brizantha) cv. Marandu, es una opción como especie forrajera a utilizar en las regiones tropicales (Castro
et al., 1994) debido a su alto rendimiento, buena calidad de forraje y excelente aceptación por el ganado, además de ser resistente a sequía, quema, plagas y enfermedades y adaptarse a suelos ácidos de baja fertilidad (Gerdes et al., 2000; Castro et al., 1994; Yuseika et al., 2006). Sin embargo, al igual que la mayoría de las gramíneas forrajeras tropicales, el principal problema para incrementar su propagación, es la baja oferta de semilla de alta calidad.
Abdelfattah Zeidan Mohamed Salem ARNOLDO GONZALEZ REYNA MONA MOHAMED MOHAMED YASSEEN ELGHANDOUR LUIS MIGUEL CAMACHO DIAZ MOISES CIPRIANO SALAZAR Ignacio Arturo Domínguez Vara ROBERTO MONTES DE OCA JIMENEZ ERNESTO MORALES ALMARAZ ANDRES GILBERTO LIMAS MARTINEZ Maria Antonia Mariezcurrena Berasain (2014)
Plant extracts, with high concentrations of secondary metabolites, are good candidates for enhancing nutrient utilization (Patra et al., 2006; Cedillo et al., 2014). Administration of Salix babylonica (SB) extract to ruminants as feed additives modified in vitro ruminal fermentation in lambs (Jiménez-Peralta et al., 2011; Salem et al., 2014b), improved in vivo digestibility as well as average daily gain of lambs (Salem et al., 2011a, 2014b) and milk production (Salem et al., 2014a). Some plant extracts also improved animal growth and nutrient digestion (Mapiye et al., 2010; Salem et al., 2011a) due to positive impacts of their secondary metabolites on activity of ruminal microorganisms (Jiménez-Peralta et al., 2011) and/or increased amino acid flow to the duodenum (Mueller-Harvey, 2006). This can result in more muscle deposition and, consequently, heavier carcasses (Gleghorn et al., 2004) and improved meat quality (Mapiye et al., 2010).
The aim of this study was to determine the effects of increasing levels of two feed additives composed of Salix babylonica (SB) extract and minerals mixture (MM) or their combination on in vitro gas production (GP) and dry matter (DM) degradability of total mixed ration (TMR; 50 concentrate: 50 corn silage, on DM basis). Combinations of four levels of SB extract (0, 0.6, 1.2 and 1.8 mL/g DM) with four levels of MM (0, 0.5, 1.5 and 2.5 g/100 g DM) were evaluated in a completely random design. Samples of TMR (1 g) were weighed in 120 mL serum bottles with addition of SB extract and/or MM. Then, 10 mL of particle free ruminal fluid were added followed by 40 mL of the buffer solution. The GP was recorded at 2, 4, 6, 8, 10, 12, 24, 48 and 72 h of incubation. Addition of SB extract, without MM, increased (P<0.05) asymptotic GP (mL/g DM), the rate of GP (/h), GP and DM degradability (DMD).
Abdelfattah Zeidan Mohamed Salem MONA MOHAMED MOHAMED YASSEEN ELGHANDOUR Ahmed E. Kholif JESUS HERNANDEZ PEREZ ANDRES GILBERTO LIMAS MARTINEZ MOISES CIPRIANO SALAZAR LUIS MIGUEL CAMACHO DIAZ SAUL ROJAS HERNANDEZ Jaime Olivares Pérez (2016)
Four cutoffs of ryegrass after 15 days (CD15), 30 days (CD30), 45 days (CD45), and 60 days (CD60) with Salix babylonica (SB) extract at 0, 30, and 60 ml/kg ryegrass silage were ensiled for 40 days and then evaluated for the in vitro dry matter (DM) digestibility and gas production (GP). No interactions occurred between cutting day and SB extract for silage’s nutrient contents and in vitro GP. The DM and organic matter (OM) contents were decreased linearly with decreased crude protein (CP), neutral detergent fibres, acid detergent fibres, and acid detergent lignin contents with advancing of days. In contrary, addition of SB extract increased silages’ OM and decreased CP contents. Addition of SB extract for CD15 and CD60 silages, quadratically decreased the lag time. However, SB extract increased the rate of GP and GP during the first 12 h of incubation at the level of 30 ml/kg with CD30 silage and asymptotic GP with the level 60 ml/kg of CD60 silage. Increased DM degradability (DMD) of CD30 and CD60 silages versus decreased DMD with CD15 with increased relative GP (ml gas/g DMD). It could be concluded that CD15 had the highest DM and OM content; however, higher GP was noted with CD45 and CD60. SB extract had weak effects on nutrient content and GP, and the level of 30 ml/kg DM was more effective than the level of 60 ml/kg DM.