A diversity of methods for jointing meat animal carcasses exists in the literature and in the technical regulations in different countries. Standardized methods with good repeatability are needed for researching works. The objective of this work is to determine a representative cut for tissue carcass composition of guinea pig from 2 different jointing methods. Forty guinea pig carcasses were selected: 20 from 3-mo-age fattening animals (10 males and 10 females) and 20 from 12-mo-age breeding discarded animals (10 males and 10 females). Each carcass was divided into 2 half carcasses; the right half carcass was jointed in 2 cuts following a technical standard commercial regulation from Peru (forequarter and hindquarter), and the left half carcass was jointed in 4 cuts following anatomical points (neck, shoulder, hind leg and ribs). Each cut was dissected in skin, muscle, sub-cutaneous fat, inter-muscular fat, waste and bone. Total fat was calculated as the sum of sub-cutaneous and inter-muscular fat, inedible section as the sum of bones and remainder, and muscle + freeze-thawing loss. All results are presented in proportion to the cut. A factorial ANOVA procedure was used with the statistical program SAS (v. 11), for each tissue comparing the different cuts and total tissue in the carcass, and second, the effect of the animal group. In some animal groups, the neck differed from the carcass in terms of proportion for sub-cutaneous and inter-muscular fat tissues, total fat and bones. On the other hand, the muscle proportion in the hindquarter cut in 12 mo-age female guinea pigs was higher respect to the muscle proportion in the whole carcass. The other studied cuts were similar in terms of proportions of the different tissues respect to the whole carcass composition. However, it is noted that the closest cut to the tissue composition of the guinea pig carcass, in percentage values, was the hind leg cut. We conclude that the most representative cut of guinea pig carcass is the hind leg, and thus the jointing method proposed in 4 cuts is the most appropriated for these animals.