Are in-line measurements of somatic cell counts equally or more useful for genetic evaluations as those from DHI?

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Are in-line measurements of somatic cell counts equally or more useful for genetic evaluations as those from DHI? / Sørensen, Lars Peter; Løvendahl, Peter.

I: Journal of Animal Science, Bind 90, Nr. Suppl, 3/J, 2012, s. 682-682.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avisKonferenceabstrakt i tidsskriftForskningpeer review

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Sørensen, LP & Løvendahl, P 2012, 'Are in-line measurements of somatic cell counts equally or more useful for genetic evaluations as those from DHI?', Journal of Animal Science, bind 90, nr. Suppl, 3/J, s. 682-682.

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Sørensen, Lars Peter ; Løvendahl, Peter. / Are in-line measurements of somatic cell counts equally or more useful for genetic evaluations as those from DHI?. I: Journal of Animal Science. 2012 ; Bind 90, Nr. Suppl, 3/J. s. 682-682.

Bibtex

@article{ef424816810149cfb213a04ae330f6fc,
title = "Are in-line measurements of somatic cell counts equally or more useful for genetic evaluations as those from DHI?",
abstract = "The aim was to estimate and compare genetic parameters for logtransformedsomatic cell counts (SCC) based on in-line measurements (OCC, DeLaval) in automatic milking systems with monthly test-day SCC from traditional herd testing schemes. Data was collected during a 29-mo interval from 6 herds and 1294 first parity cows (5 to 305 d in milk). Cell counts were analyzed using a 2-trait linear animal model. There were a total of 298,988 records for OCC and 7779 for test-day SCC. The fixed part of the model included lactation curves fitted as a Wilmink function, and the random parts included animal and herd-testday effects. Age at calving and days in milk was included as covariates.Estimates of heritability were similar for the 2 traits, h2 = 0.26 and 0.25 for OCC and SCC, respectively, and the genetic correlation between the 2 traits was close to unity (rg = 0.98). The results suggest that somatic cell counts based on in-line measurements are similar but not preferable to traditionally obtained SCC despite several OCC measurements per cow per day",
author = "S{\o}rensen, {Lars Peter} and Peter L{\o}vendahl",
note = "J. Anim. Sci. Vol. 90, Suppl. 3/J. Dairy Sci. Vol. 95, Suppl. 2",
year = "2012",
language = "English",
volume = "90",
pages = "682--682",
journal = "Journal of Animal Science",
issn = "0021-8812",
publisher = "AMER SOC ANIMAL SCIENCE",
number = "Suppl, 3/J",

}

RIS

TY - ABST

T1 - Are in-line measurements of somatic cell counts equally or more useful for genetic evaluations as those from DHI?

AU - Sørensen, Lars Peter

AU - Løvendahl, Peter

N1 - J. Anim. Sci. Vol. 90, Suppl. 3/J. Dairy Sci. Vol. 95, Suppl. 2

PY - 2012

Y1 - 2012

N2 - The aim was to estimate and compare genetic parameters for logtransformedsomatic cell counts (SCC) based on in-line measurements (OCC, DeLaval) in automatic milking systems with monthly test-day SCC from traditional herd testing schemes. Data was collected during a 29-mo interval from 6 herds and 1294 first parity cows (5 to 305 d in milk). Cell counts were analyzed using a 2-trait linear animal model. There were a total of 298,988 records for OCC and 7779 for test-day SCC. The fixed part of the model included lactation curves fitted as a Wilmink function, and the random parts included animal and herd-testday effects. Age at calving and days in milk was included as covariates.Estimates of heritability were similar for the 2 traits, h2 = 0.26 and 0.25 for OCC and SCC, respectively, and the genetic correlation between the 2 traits was close to unity (rg = 0.98). The results suggest that somatic cell counts based on in-line measurements are similar but not preferable to traditionally obtained SCC despite several OCC measurements per cow per day

AB - The aim was to estimate and compare genetic parameters for logtransformedsomatic cell counts (SCC) based on in-line measurements (OCC, DeLaval) in automatic milking systems with monthly test-day SCC from traditional herd testing schemes. Data was collected during a 29-mo interval from 6 herds and 1294 first parity cows (5 to 305 d in milk). Cell counts were analyzed using a 2-trait linear animal model. There were a total of 298,988 records for OCC and 7779 for test-day SCC. The fixed part of the model included lactation curves fitted as a Wilmink function, and the random parts included animal and herd-testday effects. Age at calving and days in milk was included as covariates.Estimates of heritability were similar for the 2 traits, h2 = 0.26 and 0.25 for OCC and SCC, respectively, and the genetic correlation between the 2 traits was close to unity (rg = 0.98). The results suggest that somatic cell counts based on in-line measurements are similar but not preferable to traditionally obtained SCC despite several OCC measurements per cow per day

M3 - Conference abstract in journal

VL - 90

SP - 682

EP - 682

JO - Journal of Animal Science

JF - Journal of Animal Science

SN - 0021-8812

IS - Suppl, 3/J

ER -