Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/28645
Title: Genetic Parameters for Milk Yield, Milk Electrical Conductivity and Milk Flow Rate in First-Lactation Jersey Cows in Sri Lanka
Contributor(s): Samaraweera, A M  (author)orcid ; Disnaka, S (author); Boerner, V  (author); van der Werf, J H J  (author)orcid ; Hermesch, Susanne  (author)orcid 
Publication Date: 2019
Open Access: Yes
Handle Link: https://hdl.handle.net/1959.11/28645
Open Access Link: http://www.aaabg.org/aaabghome/fullproc23.phpOpen Access Link
Abstract: Milk electrical conductivity is an indicator trait for mastitis, and for maintaining udder health, moderate milking speed is important. The heritabilities of sum of daily milk yields, mean milk electrical conductivity and mean milk flow rate for each 30-day period along the lactation trajectory in Jersey cows milking in their first lactation in Sri Lanka were estimated. The data included 248,854 daily records and 362,754 morning and evening records from 991 cows that calved from 2015 to 2018. Variance components and variance ratios were estimated from posterior means obtained from a Gibbs sampler. The heritability as estimated by univariate analyses for milk yield, milk electrical conductivity and milk flow rate ranged from 0.04 ± 0.01 to 0.13 ± 0.03, from 0.06 ± 0.02 to 0.09 ± 0.02, and from 0.06 ± 0.02 to 0.18 ± 0.05, respectively. Additive genetic correlations between milk yield and milk electrical conductivity or milk flow rate along the lactation ranged from -0.31 ± 0.49 to 0.77 ± 0.19 and from 0.46 ± 0.29 to 0.89 ± 0.12, respectively. Present heritability estimates were sufficiently high for milk electrical conductivity and flow rate to be used in a selection index. However, these estimates should be confirmed with more data.
Publication Type: Conference Publication
Conference Details: AAABG 2019: 23rd Conference of the Association for the Advancement of Animal Breeding and Genetics, Armidale, Australia, 27 October-1 November
Source of Publication: Proceedings of the Association for the Advancement of Animal Breeding and Genetics, v.23, p. 135-138
Publisher: Association for the Advancement of Animal Breeding and Genetics (AAABG)
Place of Publication: Armidale, Australia
ISSN: 1328-3227
Fields of Research (FoR) 2008: 070201 Animal Breeding
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
Socio-Economic Objective (SEO) 2008: 830302 Dairy Cattle
Socio-Economic Objective (SEO) 2020: 100402 Dairy cattle
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
Publisher/associated links: http://www.aaabg.org/aaabghome/
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication
School of Environmental and Rural Science

Files in This Item:
2 files
File Description SizeFormat 
Show full item record

Page view(s)

2,308
checked on Feb 25, 2024

Download(s)

4
checked on Feb 25, 2024
Google Media

Google ScholarTM

Check


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.