Naslov
Analysis of genealogical information and estimation of population parameters in population of Istrian sheep

Autori
Kasap, Ante ; Špehar, Marija ; Gorjanc, Gregor ; Ivanković, Ante ; Zdravko, Barać ; Ramljak, Jelena

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

Izvornik
56th Croatian & 16th International Symposium on Agriculture, Book of Abstracts / Rozman, Vlatka ; Antunović, Zvonko - Osijek, 2021, 258-258

Skup
56. hrvatski i 16. međunarodni simpozij agronoma

Mjesto i datum
Vodice, Hrvatska, 05.09.2021. - 10.09.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Recenziran

Ključne riječi
pedigree ; completeness ; inbreeding ; effective population size

Sažetak
Regardless of living in the era of genomics, pedigrees still play an important role in quantitative and conservation genetics. Transition to genomic selection is upcoming in many livestock populations, including Istrian sheep, but that won’t happen instantly, and for sure won’t make the pedigrees redundant. The study aimed to determine some important pedigree information and population parameters of Istrian sheep under selection. The pedigree with 6480 individuals was constructed by tracing back all the known ancestors for the 5701 phenotyped ewes. The average (and max) number of full generation, number of equivalent complete generations (equiGen), and index of pedigree completeness (PCI) were 1.34 (5), 2.16 (6.56), and 0.46 (1), respectively. The average PCI from 1st to 5th recent generation was 0.92, 0.79, 0.63, 0.43, and 0.26, respectively. The maximum mid-parent age was 11 years, and the average generation interval was 3.8 years. The coefficient of inbreeding (F) and effective population size (Ne) estimated as increase in pairwise coancestry were obtained on individuals with equiGen>3 that were born within the last generation interval (year 2015 to 2018, Nref = 650). The average Fref was 0.089. The females (Fref = 0.091) were more inbred than males (Fref = 0.056). The slope of regression of annually obtained F on birth year (BY) was ≈ 0 (P>0.1). The estimated Neref was 117 animals, and the regression of annually estimated Neref/Nref on BY was also insignificant (P>0.1) and ≈ 0. Despite the stagnation of the F in the last couple of years, its’ magnitude is still high and poses risk to this population. Carefully designed matting plan based on all the available information is required to keep it under control while trying to achieve desired selection progress.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA