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Trends in milk production, calving rate and survival of cows in 14 Irish dairy herds as a result of the introgression of Holstein-Friesian genes

Published online by Cambridge University Press:  09 March 2007

R. D. Evans ,
P. Dillon ,
F. Buckley ,
D. P. Berry ,
M. Wallace ,
V. Ducrocq  and
D. J. Garrick
R. D. Evans
Affiliation:
Teagasc, Dairy Production Research Centre, Moorepark, Fermoy, Co. Cork, Ireland Department of Agribusiness, Extension and Rural Development, Faculty of Agriculture, University College Dublin, Belfield, Dublin 4, Ireland
P. Dillon*
Affiliation:
Teagasc, Dairy Production Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
F. Buckley
Affiliation:
Teagasc, Dairy Production Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
D. P. Berry
Affiliation:
Teagasc, Dairy Production Research Centre, Moorepark, Fermoy, Co. Cork, Ireland
M. Wallace
Affiliation:
Department of Agribusiness, Extension and Rural Development, Faculty of Agriculture, University College Dublin, Belfield, Dublin 4, Ireland
V. Ducrocq
Affiliation:
Station de Génétique Quantitative et Appliquée, Institut National de la Recherche Agronomique, 78532 Jouy-en-Josas, France
D. J. Garrick
Affiliation:
Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523-1171, USA
*
†Corresponding author: E-mail: [email protected]
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Abstract

Trends in milk production, calving rates, and survival were monitored on a potential 5580 primiparous and multiparous Holstein-Friesian dairy cows across 14 Irish seasonal spring-calving dairy farms between the years 1990 and 2001. Over this period calving rate to first service (CALV1) reduced by 0·96% per year (55 to 44%; P< 0·001), calving rate to first and second service (CALV12) reduced by 0·84% per year ( 77 to 70%; P< 0·001) and herd average parity number reduced by 0·10 lactation per year (4·3 to 3·5; P<0·001). The proportion of North American Holstein Friesian (NAHF) genes in the cows increased by 5·5% per year (8 to 63%; P<0·001), while pedigree index for milk yield (PIMILK) of the cows increased by 25 kg per year ( P<0·001). The predicted difference of the sires of the cows for calving interval and survival increased by 0·5 days (P<0·001) and reduced by 0·12% ( P<0·001) per year, respectively. A negative association was found between increased phenotypic milk yield, NAHF and PIMILK and reduced calving rates as assessed by CALV1 and CALV12. Increased proportion of NAHF genes exhibited a negative effect on survival ( P<0·001) whereas increased levels of heterosis had a positive impact on survival ( P<0·001). The results of the present study indicate that in seasonal calving herds in Ireland a need for direct selection on traits related to fertility and survival is required to arrest and reverse the declining trends in calving rates and survival.

Keywords

calvingfertilitygenetic changeHolstein-Friesiansurvival
Type
Research Article
Information
Animal Science , Volume 82 , Issue 4 , August 2006 , pp. 423 - 433
Copyright
Copyright © British Society of Animal Science 2006

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