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El objetivo fue determinar el peso al nacimiento, a los 30, 60, 90 dias y destete, la ganancia de peso: mensual y en el periodo 90 dias-destete, ajustar los pesos a funciones de crecimiento en llamas K’ara y Ch’aco y definir la orientacion productiva de ambas razas. El trabajo se ejecuto en el CIP “La Raya” UNA, Puno. Los animales fueron crias de ambos sexos, de las razas K’ara y Ch’aco exclusivamente. Los pesos y ganancias de peso fueron comparados por razas. Los pesos se ajustaron a funciones de crecimiento: Brody, Logistico, Bertalanffy y Gompertz, a traves del procedimiento NLIN del SAS, modelo Gauss-Newton. El mejor modelo se determino sobre los resultados del Coeficiente de determinacion, Error de prediccion promedio, Desviacion absoluta de la media, Variancia del error de prediccion y el Cuadrado medio del error, para cada raza. Los pesos al nacimiento y a los 30 dias son similares por razas; los pesos a los 60, 90 y destete son superiores en crias K’ara (p≤0.01). Las ganancias de peso son similares en ambas razas. Los estimados de peso maduro ( A ) son mayores en los modelos Brody y Bertalanffy, respecto de Gompertz y Logistico; En todos los modelos “A” es superior en llamas de la raza K’ara. “ B ” no tienen interpretacion biologica, no se analizan los resultados. De k de Brody y Bertalanffy se deduce que ambas razas tienen mayores probabilidades de alcanzar pesos elevados a mayores edades, respecto de Gompertz y Logistico por los que el peso maduro se alcanza a edades mas tempanas, a similar peso inicial. Las llamas K’ara tienen mayores potencialidades biologicas para la ganancia de peso ; el mejor modelo elegido para el crecimiento en llamas es Brody.  WEIGHT, GAIN OF WEIGHT AND GROWTH MODELS IN BREEDINGS OF K'ARA AND CH'ACO LLAMAS ( Lama glama ) ABSTRACT The objective went to determine the birth weight, at the 30, 60, 90 days and weaning weight; the gain weight of monthly and in the period 90 days-weaning; to weights was adjust to functions of growth in llamas K'ara and Ch'aco ; to define the productive orientation of both breed. The work was executed in the CIP "La Raya" Puno, Peru. The animals were breedings of both sexes, K'ara and Ch'aco breeds, exclusively. The weight and gain weight were compared by the effect of the breed. The weights were adjusted to functions of growth: Brody, Logistical, Bertalanffy and Gompertz, through the procedure NLIN of the SAS, model Gauss-Newton. The best model was determined on the results of the Determination coefficient, Error of prediction average, Absolute deviation of the mean, Variance of the prediction error and the Mean square error, for each breed. The birth weight and the 30 days are similar for breed; the weight at the 60, 90 and wean they are superior in K'ara breeds (p ≤ 0.01). The gains of weight are similar in both breeds. Those " A " they are bigger in Brody and Bertalanffy, superiors in llamas K'ara, smaller values report Gompertz and Logistical, in both breeds. " B " they don't have biological interpretation, the results are not analyzed. Of k of Brody and Bertalanffy it is deduced that both breeds have bigger probabilities of reaching high pesos to more ages, regarding Gompertz and Logistical for those that the mature weight is reached to ages more early, to similar weight initial. The K'ara llamas has bigger biological potentialities for the gain of weight; the best model elected for the growth is Brody. Words key: Growth, Breeds, Intermediate, alive weight.

Pesos, ganancia de peso y modelos de crecimiento en crías de Llamas (Lama Glama) K’ara y Ch’aco