RT Journal Article
T1 Genetic parameters for different types of medullated fibre in Alpacas
A1 Cruz, Alan
A1 Murillo, Yanin
A1 Burgos, Alonso
A1 Yucra, Alex
A1 Morante, Renzo
A1 Quispe, Max
A1 Quispe, Christian
A1 Quispe, Edgar
A1 Gutiérrez García, Juan Pablo
AB The quality of alpaca textile fibre has great potential, especially if objectionable fibres (coarse and medullated fibres) that cause itching are reduced, considering that objectionable fibres can be identified by diameter and medullation types. The objective of this study was to estimate genetic parameters for medullar types and their respective diameters to evaluate the possibility of incorporating them as selection criteria in alpaca breeding programmes. The research used 3149 alpaca fibre samples collected from 2020 to 2022, from a population of 1626 Huacaya type alpacas. The heritability and correlations of the percentages of non-medullated (NM), fragmented medulle (FM), uncontinuous medullated (UM), continuous medullated (CM), and strongly medullated (SM) fibres were analysed, also the fibre diameter (FD) for each of the medullation types. The heritability estimated for medullation types were 0.25 ± 0.01, 0.18 ± 0.01, 0.10 ± 0.01, 0.20 ± 0.01 and 0.11 ± 0.01 for NM, FM, UM, CM and SM, respectively. The genetic correlations for medullation categories ranged from 0.15 ± 0.03 to 0.66 ± 0.02 (in absolute values). The heritabilility estimated for fibre diameter (FD) of each of the medullation types were 0.29 ± 0.03, 0.27 ± 0.02, 0.35 ± 0.02, 0.30 ± 0.02, 0.25 ± 0.02 and 0.10 ± 0.02 for FD, FD_NM, FD_FM, FD_UM, FD_CM and FD_SM, respectively. The genetic correlations for fibre diameter of the medullation types ranged from 0.04 ± 0.04 to 0.97 ± 0.01. FD, NM and FM are the main traits to be used as selection criteria under a genetic index, since they would reduce fibre diameter, and also increase NM and FM, and, in addition reducing indirectly CM, SM, and SM_FD. Therefore, the quality of alpaca fibre could be improved.
PB Wiley
SN 0931-2668
YR 2024
FD 2024-02-25
LK https://hdl.handle.net/20.500.14352/103387
UL https://hdl.handle.net/20.500.14352/103387
LA eng
NO Cruz, A., Murillo, Y., Burgos, A., Yucra, A., Morante, R., Quispe, M., Quispe, C., Quispe, E., & Gutiérrez, J. P. (2024). Genetic parameters for different types of medullated fibre in Alpacas. Journal of Animal Breeding and Genetics, 00, 1–10. https://doi.org/10.1111/jbg.12861
DS Docta Complutense
RD 5 abr 2025