The present research work was carried out at the Comarca Lagunera which is located at the North Central part of Mexico between the Meridians 102¨¬ 22¢¥ and 104¨¬ 47¢¥ West longitude, and the Parallels 24¨¬ 22¢¥ and 26¨¬ 33¢¥ North Latitude. The altitude over the mean sea level is 1130 m. Fifteen treatments were evaluated from the combination of three varieties of alfalfa, CUF 101, Sundor and Altaverde, and five levels of bovine manure, 0, 40,80,120 and 160 t ha-1. The reference teatment was the chemical formula 30-100-00 of N, P, K. Irrrigation was applied through drip irrigation and the water depth was calculated based on 80% of pan evaporation. A significant effect of manure was observed on fresh forage starting at the fourth harvest, whereas alfalfa varieties did not have a significant effect. Higher yields were obtained with 120 and 160 t ha-1 of bovine nanure. A similar effect was observed in the dry forage with manure the levels of 80, 120 and 160 t ha-1 being the better treatments with a mean yield higher than 4 t ha-1, and no significant difference among alfalfa varieties was observed. Forage quality showed difference among harvests (a= 0.01) and among manure treatments as well, which indicates that both date of harvest and manure level exert an inluence on crude protein (CP), acid detergent fiber (ADF), neutral detergent fiber (NDF) and the net energy. Alfalfa varieties did not exert a significant effect on forage quality, producing mean values of 25.2% CP, 28.6% ADF, 33.7% NDF and 1.8 Mcal lb-1of net energy. Key words: Forage quality, soil temperature and alfalfa varieties.