Abstract
The dairy activity, based on pastures, represents the main source of income for the rural population of the Andes of northern Peru. The objective was to evaluate biomass yield, growth rate, plant height, Crude Protein (CP), Neutral Detergent Fiber (NDF), in vitro digestibility of dry matter (IVDDM) and metabolizable energy (ME) of 22 genotypes of Lolium spp. in three Andean floors (AF) (AF I: 2300 - 2800, AF II: 2801 - 3300 and AF III: 3301 - 3800 masl) in northern Peru. Better biomass (7662 kg dry material (DM) ha-1 year-1) and growth rate (21.0 kg DM ha-1 day-1) showed AF I for Lolium perenne L., however AF III stood out in yield (9,041 kg MS ha-1 year-1) and growth rate (24.8 kg DM ha-1 day-1) for Lolium multiflorum L. The mean ME was 2.61 Mcal kg-1 MS and 2.43 Mcal kg-1 MS for L. perenne and L. multiflorum, respectively. The nutritional values of both varieties are adequate for feeding cattle to grazing in the mountains. Likewise, the genotypes that showed better performance should be used in a pasture improvement plan.
Highlights
Los genotipos fueron evaluados mediante un diseño en Bloques Completos al Azar (DBCA) con tres repeticiones, teniendo 33 unidades experimentales en cada pisos altitudinales (PA) para Lolium perenne L. y 33 unidades experimentales para Lolium multiflorum L
Understanding factors associated with the grazing efficiency of perennial ryegrass varieties
Cultivar and age of regrowth effects on physical, chemical and in Sacco degradation kinetics of vegetative perennial ryegrass (Lolium perenne L.)
Summary
Comportamiento productivo y valor nutricional de 22 genotipos de raigrás (Lolium spp.) en tres pisos altoandinos del norte de Perú. Basada en pasturas, representa la principal fuente de ingreso de la población rural de los andes del norte del Perú. El objetivo fue evaluar el rendimiento de biomasa, tasa de crecimiento, altura de planta, Proteína Cruda (PC), Fibra Detergente Neutro (FDN), digestibilidad in vitro de la materia seca (DIVMS) y Energía metabolizable (EM) de 22 genotipos de Lolium spp. en tres pisos altoandinos (PA) (PA I: 2300 - 2800, PA II: 2801 - 3300 y PA III: 3301 - 3800 msnm) del norte del Perú. Palabras clave: Raigrás perenne; raigrás anual; composición nutricional; zona altoandina; comportamiento productivo
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