hintonii and L. montanus was determined using the nylon bag technique with two fistulated steers in five incubation times (3, 9, 12, 24 and 48 h), including a sample of soybean paste (SP). The data obtained were analyzed using PROC MIXED of SAS for repeated measures. The results showed interactions between species and incubation time for DMD and CPD. Among species of lupine, a high DMD and CPD of seeds were observed after three hours of incubation. At 48 h, DMD and CPD did not show significant variation between species: DMD ranged from 94.3% to 96.7% and CPD from 98.9 to 99.2%. The degradation rate of the insoluble fraction of the DM (kd) in lupine seeds ranged from 6.3 to 8.1% h -1 , while that of the soluble fraction (SF) ranged from 42.3 to 57.3%, lower value that observed in SP. The DMD and CPD of aerial biomass showed statistically significant differences between species at 48 h of incubation. L. hintonii showed the lowest DMD (69.6%) and CPD (88.9%). L. montanus and L. campestris showed a lower SF and kd (kd of 5.4% h -1 in both, and 35.4 and 37.2 for SF, respectively) and high CPD of aerial biomass. It is concluded that the DM and CP of seeds and biomass of wild lupine were highly degradable as of 3 h of incubation. At 48 h, there were statistically significant differences between DMD and CPD of aboveground biomass (AGB). L. campestris and L. exaltatus showed the highest DMD and CPD of AGB and similar DMD and CPD of seeds.

En el Eje Neovolcánico Transversal Mexicano abundan diversas especies del género Lupinus, cuyas semillas presentan altos contenidos proteicos que pudieran ser aprovechados en alimentación humana y animal. Plantas en floración y fructificación de Lupinus campestris, L. exaltatus, L. hintonii y L. montanus fueron recolectadas en los Valles de Serdán y Libres del estado de Puebla, México, durante mayo y agosto de 2011, entre 2486 y 3442 msnm, para análisis químico proximal, alcaloides totales (AT), polifenoles totales (PT) y taninos condensados (TC) en diversos órganos de la planta. Las semillas presentaron el mayor porcentaje de proteína cruda (PC) (32.5 a 43.5 g/100 g); de extracto etéreo (EE) (6.5 a 7.5 g/100 g), los menores de fibra detergente neutro (FDN) (16.7 a 24.7 g/100 g) y de fibra detergente ácido (FDA) (4.4 a 7.9 g/100 g), comparado con el de hoja + tallo (PC: 22.2 a 25.5 g/100 g; EE: 0.1 a 1.7 g/100 g; FDN: 38.2 a 44.1 g/100 g, FDA: 21.7 a 30.1 g/100 g), respectivamente. Los pericarpios (vainas sin semilla) presentaron un menor contenido de PC (10.9 a 22.8 g/ 100 g) y EE (0.1 a 0.6 g/100 g), pero mayor FDN (54.4 a 68.4 g/100 g) y FDA (34.0 a 47.1 g/100 g). Los AT en semilla fueron de 2.4 a 5.4 g/100 g (L. hintonii con el mayor contenido), los PT de 221 a 554 mg/100 g, y los TC de 0.0 a 22.7 mg kg-1 (L. exaltatus y L. campestris no presentaron taninos). En el follaje, los AT variaron de 1.2 a 3.3 g/100 g, PT de 556 a 813 mg/100 g y TC de 66.85 a 99.7 mg kg-1. La semilla y el follaje de las especies de Lupinus son fuente de proteína y polifenoles, y requerirán de la reducción del nivel de alcaloides vía procesos tecnológicos o mejoramiento genético para obtener variedades aptas para uso en alimentación.