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The composition of acid whey makes it less usable, and it is an environmental and technical problem. This research aims to estimate the physicochemical characteristics of the doble crema cheese acid whey, from nine factories in the municipality of Belén in Boyacá. Laboratory methods were validated using the Lactoscan analyzer determinations and comparing them with reference methods. Accuracy was expressed in terms of relative error (% Edet) and f- and p-values; then, correlation curves were elaborated. To perform the physicochemical characterization of whey, fat, Solids-Not-Fat (SNF), protein, lactose, pH, total ash, calcium, density, and acidity were determined. The statistic of the comparison between analysis methods showed low percentages of relative error, there were no significant differences, and they had correlation coefficients greater than 0,8. The results of the physicochemical characterization showed differences in the content of protein, SNF, lactose, fat, ash, calcium, acidity, and pH. Each manufacturer has a manufacturing process for cheese and whey. There were no statistical differences for SNF, density, lactose, fat, ash, and pH within each company. However, there were differences between protein and acidity, even though companies work with the same quality of raw material and processing, there are deficiencies in the coagulation, drainage, and conservation of the whey. The analyzed acid whey is a good source of protein, calcium, lactose and has low fat content, which is attractive for manufacturing food products.

The small mammals observed in the archaeological records made us think about the way they were exploited and the extension of these practices in Patagonia, continental and insular. This paper proposes that some species of Caviomorpha rodents were intensively exploited by hunter-gatherers societies who lived in Patagonia since late Holocene. Bones, meat and skin of the animals were used. From the available documentation it has been possible to state this practice continued until last century. In addition we have verified the gathering activity was guided by sex and age, and linked with the biological and social reproduction. To give support to these assumptions we made taphonomic analysis on the small mammal assemblages and we revised historical and ethnographical documents. The information comes from two periods: colonial, s. XVI-XVIII and independent, s. XIX-XX. The use of small mammals and its predilection by Patagonian populations was recorded since the first contact episode back to 1520. For selk’nam people from northern Tierra del Fuego it became even one of the main food items and considered a delicacy.