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Title: Genetic parameters for milk yield, persistency, conductivity and milking efficiency in first lactation Jersey cows in Sri Lanka
Contributor(s): Samaraweera, A M  (author)orcid ; Boerner, V  (author); Cyril, H W (author); van der Werf, J H J  (author)orcid ; Hermesch, Susanne  (author)orcid 
Publication Date: 2018
Open Access: Yes
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Abstract: Dairy production in Sri Lanka is slowly changing from a small-scale extensive system within mixed farms to larger specialized units with intensive management based on temperate breeds and modern milking systems. The country's tropical climate may require a special breeding program for imported breeds to enhance adaptability to local conditions which could be based on data automatically recorded at the parlour. Therefore, the objective of this study was to estimate genetic parameters for milk persistency, milk electrical conductivity, flow rate, 305- day milk yield and daily am/pm milk yield using data collected automatically from November 2015 to March 2016 for imported first-lactation Jersey cows (826 cows) under an intensive management system in a single farm. Variance components and variance ratios were estimated as posterior means from a Bayesian Gibbs sampling analysis. As expected from the data structure, heritabilities were low to medium for all analysed traits and genetic correlations were all in the expected direction. Therefore, even in Sri Lanka's tropical conditions the genetic component of the phenotypic variation is sufficient to establish a breeding program based on imported Jersey cows to breed a locally adapted dairy cow.
Publication Type: Conference Publication
Conference Details: WCGALP 2018: 11th World Congress on Genetics Applied to Livestock Production, Auckland, New Zealand, 11th - 16th February, 2018
Source of Publication: Proceedings of the World Congress on Genetics Applied to Livestock Production, v.11, p. 1-6
Publisher: Massey University
Place of Publication: Palmerston North, New Zealand
Fields of Research (FoR) 2008: 070201 Animal Breeding
Fields of Research (FoR) 2020: 300305 Animal reproduction and breeding
Socio-Economic Objective (SEO) 2008: 830308 Pigs
Socio-Economic Objective (SEO) 2020: 100410 Pigs
Peer Reviewed: Yes
HERDC Category Description: E1 Refereed Scholarly Conference Publication
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Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
Conference Publication
School of Environmental and Rural Science

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