Naslov
Increasing effective population size by strengthening genetic connectedness between flocks: case study on Pag Sheep breed

Autori
Kasap, Ante ; Ramljak, Jelena ; Špehar, Marija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
30th International Symposium Animal Science Days / Brajković Vladimir ; Čubrić Čurik Vlatka ; Čurik Ino ; Držaić Ivana ; Shihabi Mario - Zagreb : Agronomski fakultet Sveučilišta u Zagrebu, 2022, 33-33

ISBN
978-953-8276-36-1

Skup
30th International Symposium Animal Science Days (ASD 2022)

Mjesto i datum
Zadar, Hrvatska, 21.09.2022. - 23.09.2022

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Efektivna veličina populacije ; genetska povezanost ; ovca, genetska raznolikost
(Effective population size ; connectedness ; sheep ; genetic diversity)

Sažetak
The effective population size (Ne) is an indicator of genetic diversity, and genetic connectedness between flocks is a “proxy” for assessing bias in across-flock BLUP genetic evaluation. We hypothesized that there is a positive correlation between these two parameters in populations under selection and checked our assumptions on data collected in Pag sheep breed (pedigree and flock information of phenotyped ewes). Only animals with sufficiently informative pedigree (>3 full known generations) were used in the inferential statistical analysis (from 1457 to 1833 animals within 4-year spanning generation interval - “sliding window” approach). The Ne estimated from the mean rate of increase in coancestry in the last generation interval was 127 animals, and the overall connectedness estimated with prediction error variance of differences in estimated breeding values (EBVs) between animals belonging to different flocks (PEVD (I’J’)) 0.81. By regressing partial (generational) Ne on partial PEVD (I’J’) it was estimated that ΔPEVD (I’J’) of 0.01 increased the Ne for 5.5 animals in average. The results suggest that strengthening connectedness in populations under selection, in addition to unbiased ranking of animals’ EBVs, has positive implications to preservation of genetic diversity. However, some discrepancies in calculation of these two parameters posed limitations to relate them and make firm conclusions, therefore more research need to be conducted on this issue before generalization.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA