Typology of indigenous hens in the central valleys of Oaxaca based on morphometric descriptors
DOI:
https://doi.org/10.22231/asyd.v15i4.901Keywords:
indigenous birds, family production units, typologyAbstract
In the region of the Central Valleys of Oaxaca, located in southern Mexico, the family production system of indigenous birds acquires great importance as a result of generating complementary income and improving the diet of rural families, in addition to the conservation of bird genotypes adapted to the production system and ecological environment of their surroundings. However, little is known about the typological characteristics of the bird groups under exploitation. The objective of the study was to group indigenous hens based on their phenotypical differences, using a random sample of 171 indigenous hens in their first laying cycle by taking the following body measurements: live weight (PV), age, dorsal height (AD), dorsal length (LD), pectoral perimeter (PPE), length of tarsus (LTARSO), length of foot (LPIE), length of thigh (LMUSLO), length of wing (LALA), width of wing (AALA), height of crest (AC), length of crest (LC), width of beak (AP), length of beak (LP), length of chin (LB), width of chin (AB), width of appendage (AO), length of appendage (LO), width of head (AC), length of head (LC), primary feather (PP) [all acronyms based on Spanish initials]. The morphometric information was analyzed estimating Pearson correlations and principal components analysis (PC) with standardized variables. The live weight showed the highest correlation with PPE (r=0.62) and LB with AB (r=0.91), which was related to the animal’s size and magnitude of the head. Two PCs explained 63 % of the total variation; PC1 included the conformation of head and extremities (tarsus and leg) and PC2 was defined by the size of the bird (height and weight). Based on their PCs, adult indigenous hens were classified into three types: very heavy, heavy and light, criteria that should be considered in the differentiation and selection of breeders.References
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