Genetic relationships between linear type traits, somatic cell score and longevity in Holstein cows of Iran

The objective of the present study was to estimate the genetic parameters for 13 linear type traits, somatic cell score (SCS) and longevity in Holstein population of Iran. Two set of data including 3000 (for SCS) and 12226(for longevity) in the first lactation records on cows distributed across 219...

Full description

Saved in:
Bibliographic Details
Published inPajouhesh And Sazandegi no. 3; pp. 29 - 38
Main Authors Bakhtiarizadeh, M.R., Ph.D Student in Animal Breeding and Genetic of Tehran University, Moradi Shahrebabak, M., Academic Members of Tehran University, Pakdel, A., Academic Members of Tehran University
Format Journal Article
LanguagePersian
Published 2009
Subjects
CONTEO DE CELULAS SOMATICAS
http://www.fao.org/aos/agrovoc#c_31738
http://www.fao.org/aos/agrovoc#c_33554
http://www.fao.org/aos/agrovoc#c_3940
http://www.fao.org/aos/agrovoc#c_4428
IRAN ISLAMIC REPUBLIC
IRAN REPUBLICA ISLAMICA
IRAN REPUBLIQUE ISLAMIQUE
LONGEVIDAD
LONGEVITE
LONGEVITY
NUMERATION CELLULAIRE SOMATIQUE
SOMATIC CELL COUNT
TRAMETES
Online AccessGet more information

Cover

More Information
Summary:The objective of the present study was to estimate the genetic parameters for 13 linear type traits, somatic cell score (SCS) and longevity in Holstein population of Iran. Two set of data including 3000 (for SCS) and 12226(for longevity) in the first lactation records on cows distributed across 219 and 1500 herd-year-season groups were used. SAS software and GLM procedure were used to fit the fixed models for determination of significant fixed effects on traits. The Genetic parameters were estimated based on restricted maximum likelihood method with an animal model using ASREML software. Heritability estimates for the type traits ranged from 0.033(foot angle) to 0.29(stature). The Genetic correlation among type traits and longevity ranged from 0.41(udder depth) to -0.5 (chest with) and among type traits and SCS ranged from 0.85(rear udder width) to -0.6(fore udder attachment). The negative genetic correlation among some type traits with SCS and also the positive genetic correlation among some type traits with longevity indicate that these traits can be used within a selection index program in national progeny-testing. From genetic point of view, it is concluded that cows with higher body size have a more SCS and lower longevity.
Bibliography:80
L10
ISSN:1019-9632