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Estimation of genetic and phenotypic parameters for productive life, milk yield and constituents and milk and fat persistency in holstein dairy cows
Other Title(s)
تقدير المعايير الوراثية و الظاهرية للحياة الإنتاجية و إنتاج و مكونات الحليب و ثبات الحليب و الدهن في أبقار الهلستين
Joint Authors
Chegini, Arash
Khorami Zadah, Fahimah
Source
Jordan Journal of Agricultural Sciences
Issue
Vol. 12, Issue 3 (30 Sep. 2016), pp.757-765, 9 p.
Publisher
University of Jordan Deanship of Academic Research (DAR)
Publication Date
2016-09-30
Country of Publication
Jordan
No. of Pages
9
Main Subjects
Topics
Abstract EN
Genetic and phenotypic parameters were estimated for first parity Holstein cows with records from April 1991 to May 2006 for 305-d milk (Milk305), fat (Fat305), and protein (Pro305) yields, fat (Fat%) and protein (Pro%) percentage, productive life (PL), natural logarithm of somatic cell score (LSCS), lactation length (LL) and milk (Milk3:1), and fat (Fat3:1) persistency.
The (co)variance components and genetic parameters were estimated using restricted maximum likelihood (REML) method.
Among production traits, the highest heritability (0.26) was for Fat% and the lowest one (0.048) was for Fat3:1 persistency.
Heritability estimate for PL was low (0.035).
Genetic correlations of PL with production traits were relatively high and positive (except for Fat% and Pro%).
PL had the highest genetic correlation with Fat3:1 and Milk3:1 persistency (0.56 and 0.45, respectively).
In general, phenotypic correlations between traits were lower than genetic correlations.
Milk3:1 and Fat3:1 persistency had favorable genetic correlation with LSCS (-0.34 and -0.36, respectively).
It can be suggested to include a combination of production and persistency traits in selection index in order to increase PL and improve udder health
American Psychological Association (APA)
Chegini, Arash& Khorami Zadah, Fahimah. 2016. Estimation of genetic and phenotypic parameters for productive life, milk yield and constituents and milk and fat persistency in holstein dairy cows. Jordan Journal of Agricultural Sciences،Vol. 12, no. 3, pp.757-765.
https://search.emarefa.net/detail/BIM-818589
Modern Language Association (MLA)
Chegini, Arash& Khorami Zadah, Fahimah. Estimation of genetic and phenotypic parameters for productive life, milk yield and constituents and milk and fat persistency in holstein dairy cows. Jordan Journal of Agricultural Sciences Vol. 12, no. 3 (2016), pp.757-765.
https://search.emarefa.net/detail/BIM-818589
American Medical Association (AMA)
Chegini, Arash& Khorami Zadah, Fahimah. Estimation of genetic and phenotypic parameters for productive life, milk yield and constituents and milk and fat persistency in holstein dairy cows. Jordan Journal of Agricultural Sciences. 2016. Vol. 12, no. 3, pp.757-765.
https://search.emarefa.net/detail/BIM-818589
Data Type
Journal Articles
Language
English
Notes
Record ID
BIM-818589