Home About Browse Search
Svenska


Genetic variation of in-line recorded milkability traits and associations with udder conformation and health in Swedish dairy cattle

Carlström, Caroline (2014). Genetic variation of in-line recorded milkability traits and associations with udder conformation and health in Swedish dairy cattle. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2014:22
ISBN 978-91-576-7992-5
eISBN 978-91-576-7993-2
[Doctoral thesis]

[img]
Preview
PDF
427kB

Abstract

Slow-milking cows lead to less efficient use of automatic milking systems (AMS) or may hold up the milking process when many cows are milked together in conventional milking parlours (CMP). Traditionally, genetic evaluations for milkability have been based on subjective observations, where the herdsmen have scored the animals once on a scale from slow to fast milking. This thesis aims at providing information useful for a genetic evaluation system based on in-line measured milkability traits. The aim was also to advance our understanding of the genetic relationships between milkability, udder conformation and udder health in order to evaluate opportunities of improving both milkability and udder health.

Milkability data from two different sources were used in the analyses: AMS and CMP data from commercial herds with Swedish Holstein and Swedish Red cows. Average flow rate (AFR), milking time (MT), box time (BT), handling time and proportion Attachment failures were used as most promising measures of milkability. The results showed that it is possible to use in-line measured information about milkability for genetic evaluation purposes. Moderate to high heritabilities and generally high repeatabilities were found for AFR, MT and BT in both breeds. High genetic correlations were obtained between AFR and the time traits. High genetic correlations between traits measured in the two systems showed that it should be possible to jointly use them in the genetic evaluation.

Shallow udders with short and thin teats were genetically associated to higher milking speed. High correlations of udder and teat conformation from in-line measured teat coordinates to corresponding traits scored by classifiers show the potential for future use of information from teat coordinates as a complement to classifications.

High milking speed was generally shown to be genetically correlated to worse udder health even though the results were somewhat inconsistent between the breeds. In the future, emphasis should be put on an udder health and milkability index aiming at improving both milkability and udder health.

Authors/Creators:Carlström, Caroline
Title:Genetic variation of in-line recorded milkability traits and associations with udder conformation and health in Swedish dairy cattle
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2014
Volume:2014:22
Number of Pages:55
Papers/manuscripts:
NumberReferences
I.Carlström, C., Pettersson, G., Johansson, K., Strandberg, E., Stålhammar, H. and Philipsson, J. (2013). Feasibility of using automatic milking system data from commercial herds for genetic analysis of milkability. Journal of Dairy Science, 96:5324-5332.
II.Carlström, C., Strandberg, E., Johansson, K., Pettersson, G., Stålhammar, H. and Philipsson, J. (2014). Genetic evaluation of in-line recorded milkability from milking parlours and automatic milking systems. Journal of Dairy Science, 97:497-506.
III.Carlström, C., Pettersson, G., Strandberg, E., Johansson, K., Stålhammar, H. and Philipsson, J. (2014). Genetic associations of teat cup attachment failures, incomplete milkings and handling time in automatic milking systems with milking speed, temperament and udder conformation (submitted).
IV.Carlström, C., Strandberg, E., Johansson, K., Pettersson, G., Stålhammar, H. and Philipsson, J. Genetic associations of in-line recorded milkability traits and udder conformation with udder health (manuscript).
Place of Publication:Uppsala
Publisher:Department of Animal Breeding and Genetics, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-7992-5
ISBN for electronic version:978-91-576-7993-2
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L10 Animal genetics and breeding
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 404 Agricultural Biotechnology > Genetics and Breeding
Agrovoc terms:dairy cows, milkability, milking, flow rate, milking parlours, milking machines, automation, robots, udders, body conformation, udder health, heritability, genetic correlation, breeding value, evaluation
Keywords:dairy cattle, milkability, flow rate, automatic milking system, conventional milking parlour, udder conformation, udder health, heritability, genetic correlation, genetic evaluation
URN:NBN:urn:nbn:se:slu:epsilon-e-1822
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-1822
ID Code:11081
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Breeding and Genetics
External funders:Stiftelsen Lantbruksforskning
Deposited By: Caroline Carlström
Deposited On:21 Mar 2014 13:16
Metadata Last Modified:01 Oct 2015 09:36

Repository Staff Only: item control page