Monitoring inbreeding trends and inbreeding depression for economically important traits of Holstein cattle in Iran

Journal of Dairy Science
M RokoueiA C Sørensen

Abstract

Pedigree information of 852,443 registered Holstein cows and bulls, collected by the Animal Breeding Center of Iran from 1971 to 2007, was used to calculate inbreeding coefficients and their effect on production, reproduction, somatic cell count, calving ease, and longevity traits. The average inbreeding coefficient for the entire population was 2.90%, ranging from zero to 47.03%. The rates of inbreeding from 1989 to 2007 were 0.22 and 0.15% per year for females and males, respectively. The rates were higher after 2000, being 0.31 and 0.21% per year for females and males, respectively. Inbreeding had a deleterious effect on most traits. For the first 3 lactations, the inbreeding depression per 1% increase in inbreeding was -18.72, -16.19, and -27.38 kg for milk yield, -0.443, -0.367, and -0.690 kg for fat yield, and -0.476, -0.425, and -0.66 kg for protein yield, respectively. For all reproductive traits, the observed undesirable effect of inbreeding was not significant, except for the calving interval (0.53 d per 1% increase in inbreeding) in the third parity and age at first calving (0.45 d per 1% increase in inbreeding). Calving ease in heifers and cows was significantly influenced by the inbreeding of the dam, indicating th...Continue Reading

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Citations

Apr 18, 2013·Animal Science Journal = Nihon Chikusan Gakkaihō·Carlos Henrique Mendes MalhadoAkin Pala
May 20, 2016·Journal of Animal Breeding and Genetics = Zeitschrift Für Tierzüchtung Und Züchtungsbiologie·R J PereiraL G Albuquerque
Apr 18, 2017·Animal : an International Journal of Animal Bioscience·B C PerezM G C D Peixoto
Sep 25, 2020·Animals : an Open Access Journal From MDPI·Miguel A Gutiérrez-ReinosoManuel Garcia-Herreros
Apr 13, 2018·Journal of Applied Genetics·Ewa Sell-KubiakTomasz Strabel
May 25, 2021·Animal : an International Journal of Animal Bioscience·O JarneckaW Jagusiak

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