In Colombia, specialized dairy systems are supported by forages use. However, edaphic and weather features are related to production and compositional quality of grasses. In this sense, it is important to recognize resilient fodder species to pastoral systems. The objective was to evaluate the establishment (covert proportion (%, Cp) and adaptation grade (0 to 3 scale, Ag) and production (dry matter yield (kg DM.ha⁻¹, Dm) and net energy lactation (Mcal.kg DM⁻¹, Nl) of 5 perennial ryegrasses (3 diploid and 2 tetraploid) and 3 clovers (2 reds and one white) in 2 regions of Colombian highlands (Tuta and Mosquera at 2600 m above sea level). In each locality, it was established 8 m² plots of each species, which had 3 replicates. The establishment variables were evaluated twice a month for 5 mo. The production variables were evaluated during dry and rainy seasons. Ryegrasses and clovers verities present similar establishment and of production responses (P > 0.05), Cp, Ag, Dm and Nl were 36.9 and 49.5, 1.5 and 1.9, 1699.1 and 1472.5, 1.4 and 1.62, respectively. The day of measure, but not the season, influenced the variables evaluated during production period (P < 0.01). In both ryegrasses and clovers, Nl was reduced by 0.34 and 0.22% as the regrowth day increased. There was a positive relationship (P < 0.01) between height, regrowth day, and dry matter yield (Table 1). In conclusion, evaluation day was more influential than specie and season on the establishment and production variables of ryegrasses and clovers. It is important to recognize grasses with a greater resilience to external factors to promote more sustainable dairy systems in Colombian highlands. Table 1. Relation between regrowth day, height, and dry matter yield of ryegrass and clover in two Colombian highland regions

Item	Mosquera				Tuta
	Mean	R2	P-value		Mean	R2	P-value
Ryegrass
Height	34.11	0.65	<0.0001		79.92	0.9	<0.0001
Regrowth day	20.58	0.6	<0.0001		77.8	0.8	<0.0001
Clover
Height	39.42	0.84	<0.0001		65.43	0.95	<0.0001
Regrowth day	40.34	0.83	<0.0001		44.09	0.81	<0.0001