Abstract
Simple SummaryGenetic characterization of breeds at risk of extinction is crucial in order to develop efficient conservation plans. In this study, for the first time to our knowledge, a set of bovine breeds summarized as Morenas Gallegas (Cachena, Caldelá, Frieiresa, Limiá, and Vianesa), located in the Northwest of Spain, were studied by using genomics tools. Our aim was to analyze their genetic diversity and their genetic relationships with a set of local and cosmopolitan European bovine breeds. The results evidence the specific genetic signature of the Morenas Gallegas bovine breeds. Cachena was the only breed located in the same cluster as the Spanish bovine breeds analyzed, while Caldelá, Frieiresa, Limiá, and Vianesa were clearly separated. The genetic diversity of the set of Morenas Gallegas breeds is intermediate or high, but Frieiresa breed showed the higher value of inbreeding coefficient and requires special attention in the next years. Vianesa shows two different lineages, with an evident Frieiresa component and without it. Our results are the proof of the valuable genetic reservoir that Morenas Gallegas bovine breeds is due to their uniqueness in comparison with other Spanish bovine breeds.A set of five local bovine breeds in danger of extinction named Cachena, Caldelá, Limiá, Frieiresa, and Vianesa and included in the group of Morenas Gallegas are located in the Autonomous Community of Galicia at the Northwest of Spain. Local authorities launched a conservation plan at the end of the 21th century in order to preserve this important genetic reservoir. However, Morenas Gallegas bovine breeds never have been analyzed with genomic tools and this information may be crucial to develop conservation plans. The aim of the study was to analyze their genetic diversity and genetic relationships with a set of local and cosmopolitan European bovine breeds using single nucleotide polymorphisms. Our results show own genetic signatures for the Morenas Gallegas breeds which form a separate cluster when compared to the Spanish breeds analyzed, with the exception of the Cachena breed. The genetic diversity levels of the Morenas Gallegas were intermediate or high, and low inbreeding coefficients can be found except for the Frieiresa breed (11%). Vianesa breed evidenced two lineages depending on the Frieiresa component influence. The Morenas Gallegas bovine breeds group represent an important Spanish bovine genetic reservoir and despite their classification within a single generic group, the five breeds show their own genetic uniqueness.
Highlights
Livestock populations have experienced an alarming rate of genetic erosion in the last three decades
Spanish cattle breeds by an authorized veterinarian
The Ho was similar for the five breeds analyzed ranging from 0.32 (Frieiresa) to 0.36 (Caldelá), while the He was the same for all the breeds
Summary
Livestock populations have experienced an alarming rate of genetic erosion in the last three decades. 200 breeds have disappeared and up to 30% are endangered [1]. This trend had a higher impact in local breeds that have been replaced by high production ones all over the world [2]. Rare breeds are distributed and well adapted to a wide variety of local environmental conditions, the continued loss of genetic diversity in last decades may jeopardize the ability of the bovine species to adapt to changing environmental conditions or to fulfil specific requirements that could be necessary in the future. 32 of the 46 Spanish bovine breeds officially recognized are classified as endangered (www.mapama.es), and national actions have been established in order to preserve that important genetic resource recognizing the special value of endangered local breeds (Royal Decree 2008)
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