Genetic and phynotypic correlations of age at first calving with some calf-hood fitness and health traits in Holstein heifers
Other Title(s)
المكافئ الوراثي و الارتباطات الوراثية للعمر عند أول ولادة كتأثير بموائمة العجول الرضيعة و الحالة الصحية للهولستين
Joint Authors
Musa, Muhammad Sulayman
Sikora, Anthony James
Abd al-Latif, Muhammad Abu Qasim
Musa, Imad Fahmi
Source
Egyptian Journal of Animal Production
Issue
Vol. 52, Issue (sup) (30 Apr. 2015), pp.37-43, 7 p.
Publisher
Egyptian Society of Animal Production
Publication Date
2015-04-30
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
Objectives of this study were to estimate the effects of calf-hood fitness and health traits on age at first calving (AFC).
Data of 2230 US Holstein heifers were collected from three farms located in Minnesota from 2003 to 2011 were used.
AFC, calculated as a difference between birth date and date of first calving ranged from 571 to 1059 days ( = 716.66 ± 47.4).
Multiple trait animal models were applied using REMLf90 software.
Fixed effects considered as revealed in; a previous nutritional experiment applied on almost half of these animals (n = 1226), (P < 0.01), and interaction between month and year of birth, while covariate effects were serum protein upon arriving to facility (SP), (P < 0.01).
Fitness traits effects included arrival to facility body weight (ABW), weaning weight (W56), weaning hip height (HH56), adjusted weight to 200d (W200), and adjusted hip height to 200d (HH200).
Health traits recorded were scours (Sc) and respiratory disease (RD).
Health traits were recorded as categorical traits according to incidence of occurrence (0: non occurrence; 1: occurrence once; and 2: occurrence twice or more).
Heritability estimate of AFC was (0.07).
Genetic correlations between calf-hood fitness traits and AFC were highly significant (0.45, 0.38, 0.34, 0.75, and 0.33) with ABW, W56, HH56, W200, and HH200, respectively.
Meanwhile, genetic correlations between AFC and both health traits (Sc and RD) were (-0.19 and -0.01), respectively.
Therefore, it is possible to build a selection index comprising calf-hood’s fitness and health performance and AFC.
American Psychological Association (APA)
Musa, Muhammad Sulayman& Sikora, Anthony James& Abd al-Latif, Muhammad Abu Qasim& Musa, Imad Fahmi. 2015. Genetic and phynotypic correlations of age at first calving with some calf-hood fitness and health traits in Holstein heifers. Egyptian Journal of Animal Production،Vol. 52, no. (sup), pp.37-43.
https://search.emarefa.net/detail/BIM-778695
Modern Language Association (MLA)
Musa, Muhammad Sulayman…[et al.]. Genetic and phynotypic correlations of age at first calving with some calf-hood fitness and health traits in Holstein heifers. Egyptian Journal of Animal Production Vol. 52, no. (sup) (Apr. 2015), pp.37-43.
https://search.emarefa.net/detail/BIM-778695
American Medical Association (AMA)
Musa, Muhammad Sulayman& Sikora, Anthony James& Abd al-Latif, Muhammad Abu Qasim& Musa, Imad Fahmi. Genetic and phynotypic correlations of age at first calving with some calf-hood fitness and health traits in Holstein heifers. Egyptian Journal of Animal Production. 2015. Vol. 52, no. (sup), pp.37-43.
https://search.emarefa.net/detail/BIM-778695
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references : p. 41-43
Record ID
BIM-778695