Selection indices for improving the production and reproduction of Friesian cows
Other Title(s)
الأدلة الانتخابية لتحسين إنتاجية و تناسل أبقار الفريزيان
Joint Authors
Abu Saq, Fathi Mustafa
Shurayhah, Hatim Ashur
Qaddad, Fatimah Ali
Source
The Libyan Journal of Agricultural
Issue
Vol. 24, Issue 2 (31 Dec. 2019), pp.73-84, 12 p.
Publisher
University of Tripoli Faculty of Agriculture
Publication Date
2019-12-31
Country of Publication
Libya
No. of Pages
12
Main Subjects
Abstract EN
The present study contained total of 670 first lactation parity complete records of Friesian cows sired by 77 bulls, raised in south of Alexandria during the period from 1985 to 2014.These records were used to estimate genetic and phenotypic parameters by using MTDFREML for total milk yield (TMY), Daily milk yield (DMY), persistency (PER), Age at first calving (AFC) and calving to first service (CFS) in addition to establishment of many combinations of selection indices.
Analysis of variance showed that sire and year of calving had significant effect on all studied traits (P< 0.01), however month of calving had significant effect on DMY and CFS only.
Heritability estimates were 0.37, 0.27, 0.03, 0.38 and 0.11 for the previous traits respectively, the genetic correlations ranged from -0.92 to 0.94 and phenotypic correlation ranged from -0.25 to 0.64.
Comparison between twenty-two selection indices showed that the maximum return can be achieved when applying the indices, I10 and I6 which includes three or four traits.These indices are simple and easy to construct.
Therefore, it is recommended to apply selection at the end of first lactation based on these indices.
American Psychological Association (APA)
Abu Saq, Fathi Mustafa& Shurayhah, Hatim Ashur& Qaddad, Fatimah Ali. 2019. Selection indices for improving the production and reproduction of Friesian cows. The Libyan Journal of Agricultural،Vol. 24, no. 2, pp.73-84.
https://search.emarefa.net/detail/BIM-1088829
Modern Language Association (MLA)
Abu Saq, Fathi Mustafa…[et al.]. Selection indices for improving the production and reproduction of Friesian cows. The Libyan Journal of Agricultural Vol. 24, no. 2 (2019), pp.73-84.
https://search.emarefa.net/detail/BIM-1088829
American Medical Association (AMA)
Abu Saq, Fathi Mustafa& Shurayhah, Hatim Ashur& Qaddad, Fatimah Ali. Selection indices for improving the production and reproduction of Friesian cows. The Libyan Journal of Agricultural. 2019. Vol. 24, no. 2, pp.73-84.
https://search.emarefa.net/detail/BIM-1088829
Data Type
Journal Articles
Language
English
Notes
Record ID
BIM-1088829