Genetic parameters for Milk Somatic Cell Score and Relationships with Production Traits in Primiparous Dairy Sheep

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Abstract

A total of 13,066 first-lactation test-day records of 2,277 Valle del Belice ewes from 17 flocks were used to estimate genetic parameters for somatic cell scores (SCS) and milk production traits, using a repeatability test-day animal model. Heritability estimates were low and ranged from 0.09 to 0.14 for milk, fat, and protein yields, and contents. For SCS, the heritability of 0.14 was relatively high. The repeatabilities were moderate and ranged from 0.29 to 0.47 for milk production traits. The repeatability for SCS was 0.36. Flock-test-day explained a large proportion of the variation for milk production traits, but it did not have a big effect on SCS. The genetic correlations of fat and protein yields with fat and protein percentages were positive and high,indicating a strong association between these traits. The genetic correlations of milk production traits with SCS were positive and ranged from 0.16 to 0.31. The results showed that SCS is a heritable trait in Valle del Belice sheep and that single-trait selection for increased milk production will also increase SCS.
Lingua originaleEnglish
pagine (da-a)1998-2003
RivistaJournal of Dairy Science
Volume90
Stato di pubblicazionePublished - 2007

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dairy sheep
somatic cells
Sheep
Milk
milk
milk production
repeatability
Fats
genetic correlation
flocks
heritability
milk protein yield
Milk Proteins
milk fat yield
testing
lipids
Lactation
ewes
Proteins
lactation

All Science Journal Classification (ASJC) codes

  • Food Science
  • Genetics
  • Animal Science and Zoology

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@article{69c762a020044c28ae5c766497d565d8,
title = "Genetic parameters for Milk Somatic Cell Score and Relationships with Production Traits in Primiparous Dairy Sheep",
abstract = "A total of 13,066 first-lactation test-day records of 2,277 Valle del Belice ewes from 17 flocks were used to estimate genetic parameters for somatic cell scores (SCS) and milk production traits, using a repeatability test-day animal model. Heritability estimates were low and ranged from 0.09 to 0.14 for milk, fat, and protein yields, and contents. For SCS, the heritability of 0.14 was relatively high. The repeatabilities were moderate and ranged from 0.29 to 0.47 for milk production traits. The repeatability for SCS was 0.36. Flock-test-day explained a large proportion of the variation for milk production traits, but it did not have a big effect on SCS. The genetic correlations of fat and protein yields with fat and protein percentages were positive and high,indicating a strong association between these traits. The genetic correlations of milk production traits with SCS were positive and ranged from 0.16 to 0.31. The results showed that SCS is a heritable trait in Valle del Belice sheep and that single-trait selection for increased milk production will also increase SCS.",
author = "Baldassare Portolano and Raffaella Finocchiaro and Valentina Riggio and {Van Kaam} and Bovenhuist",
year = "2007",
language = "English",
volume = "90",
pages = "1998--2003",
journal = "Journal of Dairy Science",
issn = "0022-0302",
publisher = "Elsevier Limited",

}

TY - JOUR

T1 - Genetic parameters for Milk Somatic Cell Score and Relationships with Production Traits in Primiparous Dairy Sheep

AU - Portolano, Baldassare

AU - Finocchiaro, Raffaella

AU - Riggio, Valentina

AU - Van Kaam, null

AU - Bovenhuist, null

PY - 2007

Y1 - 2007

N2 - A total of 13,066 first-lactation test-day records of 2,277 Valle del Belice ewes from 17 flocks were used to estimate genetic parameters for somatic cell scores (SCS) and milk production traits, using a repeatability test-day animal model. Heritability estimates were low and ranged from 0.09 to 0.14 for milk, fat, and protein yields, and contents. For SCS, the heritability of 0.14 was relatively high. The repeatabilities were moderate and ranged from 0.29 to 0.47 for milk production traits. The repeatability for SCS was 0.36. Flock-test-day explained a large proportion of the variation for milk production traits, but it did not have a big effect on SCS. The genetic correlations of fat and protein yields with fat and protein percentages were positive and high,indicating a strong association between these traits. The genetic correlations of milk production traits with SCS were positive and ranged from 0.16 to 0.31. The results showed that SCS is a heritable trait in Valle del Belice sheep and that single-trait selection for increased milk production will also increase SCS.

AB - A total of 13,066 first-lactation test-day records of 2,277 Valle del Belice ewes from 17 flocks were used to estimate genetic parameters for somatic cell scores (SCS) and milk production traits, using a repeatability test-day animal model. Heritability estimates were low and ranged from 0.09 to 0.14 for milk, fat, and protein yields, and contents. For SCS, the heritability of 0.14 was relatively high. The repeatabilities were moderate and ranged from 0.29 to 0.47 for milk production traits. The repeatability for SCS was 0.36. Flock-test-day explained a large proportion of the variation for milk production traits, but it did not have a big effect on SCS. The genetic correlations of fat and protein yields with fat and protein percentages were positive and high,indicating a strong association between these traits. The genetic correlations of milk production traits with SCS were positive and ranged from 0.16 to 0.31. The results showed that SCS is a heritable trait in Valle del Belice sheep and that single-trait selection for increased milk production will also increase SCS.

UR - http://hdl.handle.net/10447/22216

M3 - Article

VL - 90

SP - 1998

EP - 2003

JO - Journal of Dairy Science

JF - Journal of Dairy Science

SN - 0022-0302

ER -