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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/559

Title: Genetic relationships among linear type traits, milk yield, body weight, fertility and somatic cell count in primiparous dairy cows
Authors: Berry, Donagh P.
Buckley, Frank
Dillon, Pat
Evans, Ross D
Veerkamp, Roel F
Keywords: Body weight
Fertility
Genetic
Somatic cell count
Type
Issue Date: 2004
Publisher: Teagasc (Agriculture and Food Development Authority), Ireland
Citation: D.P. Berry, F. Buckley, P. Dillon, R.D. Evans, R.F. Veerkamp. Genetic relationships among linear type traits, milk yield, body weight, fertility and somatic cell count in primiparous dairy cows. Irish Journal of Agricultural and Food Research 43: 161–176, 2004.
Series/Report no.: Irish Journal of Agricultural and Food Research;vol 43
Abstract: Phenotypic and genetic (co)variances among type traits, milk yield, body weight, fertility and somatic cell count were estimated. The data analysed included 3,058 primiparous spring-calving Holstein-Friesian cows from 80 farms throughout the south of Ireland. Heritability estimates for the type traits varied from 0.11 to 0.43. Genetic correlations among some type traits were very strong and may indicate the possibility of reducing the number of traits assessed on each animal; the genetic correlation between angularity and body condition score was –0.84. Genetic correlations between all type traits (except body condition score, udder depth and teat length) and milk yield were positive and ranged from 0.08 to 0.69. The possibility of selecting for body weight may be achievable within a national progeny-testing programme using type traits within a selection index. Moderate to strong genetic correlations existed between some type traits and the various fertility measures and somatic cell count indicating the opportunity of indirect selection for improved fertility and health of animals using type traits within a selection index; however, the standard errors of some of the genetic correlations were large and should thus be treated with caution. Genetically taller, wider, deeper, more angular cows with tighter, stronger, shallower udders were predisposed to have inferior pregnancy rates to first service and require more services.
Description: peer-reviewed
The authors wish to acknowledge with gratitude Allied Irish Bank, the AI Managers Association, the Holstein-Friesian Society of Great Britain and Ireland, Dairy Levy Farmer Funds and EU Structural Funds (FEOGA) in financing the research programme.
URI: http://hdl.handle.net/11019/559
http://www.teagasc.ie/research/journalarchives/vol43no22004fullpdfs.asp
ISSN: 0791-6833
Appears in Collections:Animal & Bioscience
IJAFR, volume 43, 2004

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