A randomized complete block design with five replications was used to assess biomass yield, in vitro dry matter digestibility (IVDMD) and nutritional value of spineless cactus (Opuntia ficus-indica) produced under drip irrigation and fertilization. Cladodes were harvested from an established plantation at 30, 37, 45, 60, 75 and 90 d of growth. Weight per cladode increased linearly and length increased quadratically with maturity. Biomass yield (t/ha), gross energy (GE), dry matter (DM), crude protein (CP), neutral detergent fibre and acid detergent fibre increased quadratically with maturity. Thus, the curve became asymptotic at 60 d of growth (28.9 ± 2.1 cm). As growth progressed, concentration of CP and nitrates decreased, and that of fibre increased. In vitro solubility, potential digestibility and digestibility rate of DM decreased linearly with increased maturity of the cladodes. However, there was a quadratic effect of maturity on total digestibility of DM. Thus, the curve became asymptote at 75 d. The optimal yield of nutrients, nutritional value and IVDMD of cladodes were recorded between 60 and 75 d of age when they were 29 to 31 cm in length.
La producción ovina es la actividad pecuaria más extendida en zonas rurales del país, aprovecha subproductos y residuos de cosecha que transforma en productos de alto valor biológico y económico para las familias que desarrollan esta actividad. El objetivo fue caracterizar el sistema de producción ovina en el sur de la Ciudad de México. Se obtuvo información de 25 unidades de producción (UP) acerca del manejo de los rebaños y aspectos productivos y socioeconómicos. Se obtuvieron los estadísticos descriptivos y se realizó un análisis clúster y de componentes principales (ACP). El tamaño promedio de los rebaños fue de 69.1 ± 3.8 cabezas (cb) y cuentan con 3.3 ± 1.0 hectáreas (ha). La finalidad de las UP es la cría y engorda de corderos para abasto. El ACP identificó que variables de tipo social y económico explicaban 82% de la variabilidad. Este sistema de producción tiene gran viabilidad, ya que puede producir forrajes para los ovinos y un mercado seguro en la Ciudad de México.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.