For decades, the aim of the agricultural production was to increase food yields to cover the increase demand for food products. This intensification process has been especially important in the animal production because of the increasing demand for protein of animal origin. Then, breeds were intensively selected for food purposes and widely disseminated while native local breeds were abandoned, although some of them have survived for cultural or environmental reasons (Hiemstra et al., 2010). Recently, a tendency to a local breeds indigenous to the area and in danger of being lost (endangered) has been observed and indigenous breeds have been promoted by the European Rural Development Programme (EC, 2004). Within this framework, regional and national public administrations usually support extensive production systems based on indigenous local breeds to guarantee the maintenance of these breeds as a way to provide public goods such as biodiversity conservation, landscape preservation, cultural heritage, etc. The maintenance of these breeds is also important because they are better adapted to the local environmental conditions, more resistant to pests and diseases and help to preserve genetic resources (Dominguez-Torreiro, 2014). Then, European farmers of indigenous local breeds have benefited from European Union economic support in the past and it is forecast to continue being supported by regional and national authorities in the future. However, it is in the public debate that economic support cannot last forever. Then, for the long-run maintenance of indigenous local breeds to be possible, the derived meat products from these breeds should be demanded by consumers or at least by a group of local consumers (Dominguez-Torreiro, 2014). This is the aim of this paper, to study consumers’ demand for indigenous local meat products.

Despite of the importance of assessing consumers’ willingness to pay for indigenous local varieties or breeds, few empirical papers have dealt with this topic. Some empirical papers measured consumers’ willingness to pay for indigenous local varieties for crops (Brugarolas et al., 2009; Dinis et al., 2011; Martinez-Carrasco et al., 2015) and the remaining for indigenous local breeds (Bett et al., 2013; Gracia & de-Magistris, 2013; Dominguez-Torreiro, 2014; Gracia, 2014). Results indicate that consumers are willing to pay more for food product from indigenous local varieties or breeds. These papers used to measure willingness to pay different hypothetical valuation methods (contingent valuation or choice experiment) except for Brugarolas et al. (2009) who used a non-hypothetical experimental auction and Gracia (2014) who used a non-hypothetical choice experiment. In this paper, we followed the last two papers.

The name of the analysed indigenous sheep breed is “Ojinegra de Teruel” with a total number of animals around 29,000 heads. Therefore, this breed is considered one of the indigenous promotion breeds (“raza autóctona de fomento”) under the Spanish National Regulation on conservation, improvement and promotion of animal breeds (BOE, 2008). It is native from the counties of Bajo Aragón, Andorra and Maestrazgo (Teruel province, NE of Spain) characterized by a harsh geography (mountainous), an extreme continental climate (large temperature fluctuations, low rainfalls) and a remarkable demographic dispersion. Then, families in the area were forced to search for animal production alternatives that were able to use the available resources. The “Ojinegra de Teruel” breed has been produced for a long time in this area because other breeds could not adapt to the climatic characteristics of this geographic environment. This breed has a high capacity to run on top of mountains in semi-extensive farms, maximizing the use of the natural resources. Therefore, “Ojinegra de Teruel” plays an important economic, social and environmental role (Ripoll et al., 2010) supporting the local economy in the area in terms of jobs and income but also it is an important animal genetic resource. However, the long conservation of this breed would only be possible if consumers or at least a group of local consumers are willing to buy and therefore, to pay for lamb meat from this breed. The specific aim of this paper was to assess local consumers’ willingness to pay for the lamb meat from the “Ojinegra de Teruel” breed.

To measure consumers’ willingness to pay for the indigenous local breed, a non-hypothetical experimental auction was conducted in a medium-sized town within 150 kilometers from the sheep breed producing area using consumers of lamb meat.

Since the seminal paper of Hoffman et al. (1993), who used an incentive compatible experimental auction to value a new beef packaging, numerous studies used experimental auctions to elicit consumer preferences for product attributes or new products (Lusk & Shogren, 2007). In a typical experimental auction, subjects bid to obtain one or more goods and the highest bidder(s) have to buy the auctioned product and pay a price that is determined in the auction. Then, participants face a well-defined economic incentive structure that enables the researchers to more accurately elicit the value of a “new product”. In addition, another advantage of experimental auctions is that one could collect willingness to pay values from individual subjects, in contrast to other elicitation techniques (e.g., choice experiments) which generally rely on statistical models and assumption about people’s utility functions to generate estimated willingness to pay values (Lusk & Shogren, 2007).

In this paper, we used a simultaneous experimental auction as it has been done in several studies in the past (e.g., Huffman et al., 2003; Nalley et al., 2006; Bernard & Bernard, 2009). Moreover, Alfnes (2009) indicated that the simultaneous bidding approach seems to be the best choice when valuing products’ quality attributes. In this auction, we asked subjects to simultaneously submit bids for two different lamb meats. One of the auctioned products was the lamb meat with the indication that comes from animals of the indigenous breed “Ojinegra de Teruel”, named OJITER breed claim. To have a benchmark, we also auctioned a lamb meat, as it was sold in the market, without indication of the sheep breed, named without breed claim. We selected lamb ribs because there are well-known cuts in the market of the town (a package of three lamb ribs of approximately 250 g). To avoid demand reduction effects or diminishing demand utility, a product was randomly drawn as the binding product at the end of the auction (Lusk & Shogren, 2007). To avoid consumers’ deception, we used the corresponding real products in the auctions (Croson, 2005). Among the different incentive compatible auction mechanisms, we used a fourth-price auction because it provides more winners than a typical Vickrey second-price auction (Lusk et al., 2007). The second-price auction method will only produce one winner per session and this situation could disengage some of the participants (e.g., off-margin bidders). Lusk et al. (2007) found that if the number of participants who could purchase the product is approximately half the session size (N), then this auction mechanism would generally be more effective in engaging all bidders (low, medium and high value bidders). Consequently, we planned of having an average of 10 participants per session so that either a fourth- or fifth-price auction would then be appropriate. In addition, the fourth-price auction was selected because it was used in several papers in the past (e.g., Alfnes et al., 2008; Yue et al., 2009; Muller & Ruffieux, 2011).

We conducted five rounds in each session as suggested by Lusk et al. (2004). The price and identification number of the highest bidders for each product were written on a whiteboard after each round. The use of multiple rounds with price feedback (posted prices) was first applied in experimental auctions because as Plott (1996) suggested, people’s preferences are learned through experience and market exposure. Hence, price feedback in multiple rounds was used as a mechanism for subjects to learn the auction market1.

We used an artefactual experiment (Harrison & List, 2004) because we recruited consumers to ensure that people in the experiments were generally representative of shoppers in the store (Chang et al., 2009). The experiment was conducted in the medium-size town of Zaragoza (Spain) around 150 kilometers from the area where the “Ojinegra de Teruel” lamb meat is produced. We used 14 sessions of approximately 11 people per session. We randomly recruited participants from different districts using two criteria. The first criterion was their involvement in food shopping decisions and lamb meat consumption. Only individuals who stated to be involved in these two activities were selected. During the recruitment stage, participants were not informed about the specific objective of the study. After arrival of the participants, subjects were informed that they would receive €10 participation fee at the end of the session. After subjects consented to participate in the auction, they were assigned an ID number and received the experimental instructions together with the product information. The monitor read the instructions aloud emphasizing that their dominant strategy is to reveal their true values and that one round and one product will be randomly drawn as binding. Before the lamb meat auction, we ran a practice auction using different candy bars to fully familiarize participants with the auction mechanism and to inform them that it is in their best interest to bid their true values. After this practice auction, we conducted the lamb meat auction. First, the monitor passed the packages of lamb ribs to be auctioned around so that each participant could inspect the products. The lamb auction was then conducted in several steps:

The total number of participants in the experiment was 155. Table 1 reports the descriptive statistics for the socio-demographic characteristics of the subjects. Most of participants were female (66%), living in households of 2.8 members on average and with an average age of 52 years old. Around 26% of participants had a university degree and a net monthly income higher than €2,5002.

Table 2 shows the bids for the lamb ribs packages across the five rounds of bidding as well as the marginal willingness to pay (calculated as the difference between bids for the lamb meat with the indigenous OJITER breed claim and without breed claim). It can be observed that bids increased from round 1 to round 2 but generally stabilized after round 2. Consequently, there seems to be no evidence of the bids being correlated or “affiliated” with the posted price. It can be observed that the bids for the lamb meat without breed claim were statistically lower than the ones with the indigenous OJITER breed claim (the t-tests of equality3 between them were rejected in all the cases at the 5% significant level). Moreover, it can be noticed that marginal WTPs or premium consumers were willing to pay for the lamb meat with the indigenous OJITER breed claim instead of the lamb meat without breed claim were positive indicating that consumers were willing to pay a premium for the lamb meat when it is claimed that comes from the indigenous OJITER breed.

To control for socio-demographic and affiliation effects on willingness to pay and to further test if consumers are willing to pay a positive premium for the lamb meat with the indigenous OJITER breed claim as shown in Table 2, we pooled the bids for the two packages of lamb ribs (without breed claim and with OJITER breed claim) and modelled the bids for each individual as a function of some control variables defined in Eq. [1]: