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Genetic parameters for lameness, mastitis and dagginess in a multi-breed sheep population

Published online by Cambridge University Press:  24 November 2016

A. C. O’Brien ,
N. McHugh ,
E. Wall ,
T. Pabiou ,
K. McDermott ,
S. Randles ,
S. Fair  and
D. P. Berry
A. C. O’Brien
Affiliation:
Department of Animal and Biosciences, Animal and Grassland Research and Innovation Centre, Teagasc, Moorepark, Fermoy P61 P302, Co. Cork, Ireland Laboratory of Animal Reproduction, Department of Life Sciences, Faculty of Science and Engineering, University of Limerick, Limerick V94 T9PX, Ireland
N. McHugh
Affiliation:
Department of Animal and Biosciences, Animal and Grassland Research and Innovation Centre, Teagasc, Moorepark, Fermoy P61 P302, Co. Cork, Ireland
E. Wall
Affiliation:
Sheep Ireland, Highfield House, Shinagh, Bandon P72 X050, Co. Cork, Ireland
T. Pabiou
Affiliation:
Sheep Ireland, Highfield House, Shinagh, Bandon P72 X050, Co. Cork, Ireland
K. McDermott
Affiliation:
Sheep Ireland, Highfield House, Shinagh, Bandon P72 X050, Co. Cork, Ireland
S. Randles
Affiliation:
Sheep Ireland, Highfield House, Shinagh, Bandon P72 X050, Co. Cork, Ireland
S. Fair
Affiliation:
Laboratory of Animal Reproduction, Department of Life Sciences, Faculty of Science and Engineering, University of Limerick, Limerick V94 T9PX, Ireland
D. P. Berry*
Affiliation:
Department of Animal and Biosciences, Animal and Grassland Research and Innovation Centre, Teagasc, Moorepark, Fermoy P61 P302, Co. Cork, Ireland
*
†E-mail: [email protected]
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Abstract

The objective of the present study was to quantify the extent of genetic variation in three health-related traits namely dagginess, lameness and mastitis, in an Irish sheep population. Each of the health traits investigated pose substantial welfare implications as well as considerable economic costs to producers. Data were also available on four body-related traits, namely body condition score (BCS), live weight, muscle depth and fat depth. Animals were categorised as lambs (<365 days old) or ewes (⩾365 days old) and were analysed both separately and combined. After edits, 39 315 records from 264 flocks between the years 2009 and 2015 inclusive were analysed. Variance components were estimated using animal linear mixed models. Fixed effects included contemporary group, represented as a three-way interaction between flock, date of inspection and animal type (i.e. lamb, yearling ewe (i.e. females ⩾365 days but <730 days old that have not yet had a recorded lambing) or ewe), animal breed proportion, coefficients of heterosis and recombination, animal gender (lambs only), animal parity (ewes only; lambs were assigned a separate ‘parity’) and the difference in age of the animal from the median of the respective parity/age group. An additive genetic effect and residual effect were both fitted as random terms with maternal genetic and non-genetic components also considered for traits of the lambs. The direct heritability of dagginess was similar across age groups (0.14 to 0.15), whereas the direct heritability of lameness ranged from 0.06 (ewes) to 0.12 (lambs). The direct heritability of mastitis was 0.04. For dagginess, 13% of the phenotypic variation was explained by dam litter, whereas the maternal heritability of dagginess was 0.05. The genetic correlation between ewe and lamb dagginess was 0.38; the correlation between ewe and lamb lameness was close to zero but was associated with a large standard error. Direct genetic correlations were evident between dagginess and BCS in ewes and between lameness and BCS in lambs. The present study has demonstrated that ample genetic variation exists for all three health traits investigated indicating that genetic improvement is indeed possible.

Keywords

lambewehealthheritabilitycorrelation
Type
Research Article
Information
animal , Volume 11 , Issue 6 , June 2017 , pp. 911 - 919
Copyright
© The Animal Consortium 2016 

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