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During the past few years a development of breeding llamas and alpacas took place in Czech Republic. Increasing interest in those animals entails the need to determine how they respond to the conditions of our country. The aim of this thesis is to evaluate the growth ability of crias, some of the physical dimensions (withers height) and bodyweight of adult llamas. The same indicators are to be evaluated for alpacas as well. The results are to be compared with the standard for llamas and alpacas. A total of 104 animals were measured and weighted, namely 44 llamas and 60 alpacas, and 280 pairs of weight and height data were obtained. Weighing and measuring of adult llamas and alpacas took place once a year around the end of August for two years (2009 and 2010). Young llamas were weighed and measured at approximately monthly intervals according to the possibilities of their breeders. Young alpacas were weighed at approximately weekly intervals. The thesis is divided into two parts. The first part evaluates llamas. It was discovered that the average birth weight of llamas in the Czech Republic is 11 kg. Once mature, they reach an average live weight of 130.3 kg and average height of 110.2 cm. Average daily gains were observed as follows: from birth to 7 weeks 0.20 kg per day, from 7 weeks to 24 weeks 0.18 kg per day and from 24 to 72 weeks 0.13 kg per day. The second part of this thesis is devoted to alpacas, for which the same parameters as for the llamas were monitored. It was found that the average birth weight of alpacas in the Czech Republic is 6.5 kg. Once mature, they reach an average live weight of 65.6 kg and average height at 88.4 cm. Average daily gains are at the following levels: from birth to 7 weeks 0.1 kg per day, from 7 weeks to 24 weeks 0.09 kg per day and from 24 weeks to 72 weeks 0.08 kg per day. It was found that these two species reach final physical maturity later in the Czech Republic than stated by literature. Compared to the standard, most of the llamas and alpacas are up to their standards.