Genetic Parameters of Dairy Character, Protein Yield, Clinical Mastitis, and Other Diseases in the Danish Holstein Cattle

Hansen, Maria S.; Lund, Mogens Sandø; Sørensen, M.K.; Christensen, Leif

doi:10.3168/jds.s0022-0302(02)74093-9

Cited by 68 publications

(66 citation statements)

References 28 publications

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“…These trends may be a correlated response to intense selection for increased milk yield, which has remarkably increased genetic merit for milk yield in the past two decades 2006b). Intense selection for milk yield causes an unfavourable response in udder health (Castillo-Juarez et al, 2002;Hansen et al, 2002;Koivula et al, 2005). Furthermore, the direction of selection of RUH and UC, which might also have been a correlated response to selection for increased milk yield, might have resulted in increased SCS.…”

Section: Discussionmentioning

confidence: 99%

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An analysis of the genetic relationship between udder health and udder conformation traits in South African Jersey cows

Dube

Dzama

Banga³

et al. 2009

Animal

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A multi-trait animal model was used to estimate genetic parameters among lactation somatic cell score (SCS) and udder-type traits in South African Jersey cattle, through restricted maximum likelihood (REML) procedures. Data comprised records on 18 321 Jersey cows in 470 herds, collected through the National Milk Recording Scheme from 1996 to 2002. Average SCS in the first three lactations (SCS 1 , SCS 2 and SCS 3 ) were considered as different traits and the udder-type traits were fore udder attachment (FUA), rear udder height (RUH), rear udder width (RUW), udder cleft (UC), udder depth (UD), fore teat placement (FTP), rear teat placement (RTP) and fore teat length (FTL). Heritability estimates for the respective lactation SCS were 0.07 6 0.01, 0.11 6 0.01 and 0.11 6 0.02. Udder-type traits had heritability estimates ranging from 0.14 6 0.01 for UD to 0.30 6 0.02 for FTL. Genetic correlations between SCS and udder-type traits ranged from 20.003 6 0.07 between FUA and SCS 3 to 20.50 6 0.07 between UD and SCS 3 . Slow genetic progress is expected when selection is applied independently on SCS and udder-type traits, due to the generally low heritabilities. Tightly attached shallow udders with narrowly placed rear teats are associated with low SCS in the Jersey population.

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Section: Discussionmentioning

confidence: 99%

“…Selection on milk production has been observed to have an adverse effect on udder health (Castillo-Juarez et al, 2002;Hansen et al, 2002;Koivula et al, 2005). Serrano et al (2003) pointed out that a fixation of alleles that diminish mastitis resistance occurs in breeds that have a long history of selection to improve milk yield.…”

Section: Introductionmentioning

confidence: 99%

An analysis of the genetic relationship between udder health and udder conformation traits in South African Jersey cows

Dube

Dzama

Banga³

et al. 2009

Animal

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“…Th e relationship between dairy character and mastitis incidence was addressed in some previous studies. Hansen et al (2002) and Lassen et al (2003) estimated moderate genetic correlations between these two traits in Danish Holstein cattle and concluded that breeding for less expressed dairy character will increase resistance to mastitis. We had no data on CM, but assuming that SCS is a good indicator of mastitis, no such a tendency as in Danish Holsteins was observed in the Polish population.…”

Section: Discussionmentioning

confidence: 99%

Heritabilities and genetic correlations of lactational and daily somatic cell score with conformation traits in Polish Holstein cattle

Ptak¹,

Jagusiak²,

Zarnecki³

et al. 2011

CZECH J ANIM SCI

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The objective of this study was to estimate heritabilities and genetic correlations of lactational and daily somatic cell scores with descriptive and linear type traits in Polish Holstein-Friesian cows. Data were: test-day somatic cell scores and conformation evaluations of 24 599 primiparous cows, daughters of 802 sires. Cows calved from 2006 to 2007. The lactational somatic cell score was calculated as the average of four test-day somatic cell scores at least. The daily somatic cell score was the test-day somatic cell score closest to the date of type evaluation. A multi-trait animal model was used to estimate genetic parameters. (Co)variance components were estimated by a Bayesian algorithm via Gibbs sampling. The heritability of lactational somatic cell score was 0.20 and it was much higher than that of daily somatic cell score (0.13). Heritabilities of type traits were high to moderate for height at rump (0.46), size (0.39), overall conformation score (0.30), two linear rump traits (0.28–0.29) and three linear teat traits (0.26–0.29). The genetic correlation between lactational and daily somatic cell scores was 0.84. In many cases, daily somatic cell score showed higher genetic correlations with type traits than lactational somatic cell score. Descriptive udder and feet and legs scores were genetically correlated negatively with both lactational (–0.22 and –0.20) and daily somatic cell scores (–0.28 and –0.33). Somatic cell traits were genetically correlated positively with rump angle (0.21 and 0.19) and negatively with fore udder height (–0.26 and –0.29), udder depth (–0.23 and –0.17) and central ligament (–0.14 and –0.16). Due to higher heritability, direct selection for lower lactational somatic cell score would be more effective than selection for lower daily somatic cell score. The magnitude of obtained heritabilities and the favourable genetic correlations indicate that the selection utilizing some type traits could improve the resistance to mastitis.

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“…In addition, linear type traits are more heritable than mastitis incidence and SCS (Rupp & Boichard, 1999;DeGroot et al, 2002;Marie-Etancelin et al, 2005). South African Journal of Animal Science 2008, 38 (1) © South African Society for Animal Science 2 Selection in South African Holstein cattle has been mostly on milk yield, which has a deleterious effect on udder health (Castillo-Juarez et al, 2002;Hansen et al, 2002;Koivula et al, 2005). Serrano et al (2003) pointed out that a fixation of alleles that diminish mastitis resistance occurs in breeds that have a long history of selection to improve milk yield.…”

Section: Introductionmentioning

confidence: 99%

Genetic analysis of somatic cell score and udder type traits in South African Holstein cows

2008

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Selection accuracy for resistance to mastitis may be increased by combining somatic cell score (SCS) and udder type into an udder health index, using genetic parameter estimates among them. A multi-trait animal model was used to estimate genetic parameters among lactation average SCS and udder type traits in South African Holstein cattle, through REML procedures. Data comprised records on 22 999 Holstein cows in 722 herds, collected through the National Milk Recording Scheme from 1996 to 2002. Average SCS in the first three lactations (SCS 1 , SCS 2 , SCS 3 ) were considered as different traits and the udder type traits were fore udder attachment (FUA), rear udder height (RUH), udder cleft (UC), udder depth (UD), fore teat length (FTL) and fore teat placement (FTP). Heritability estimates for SCS were 0.19 ± 0.02, 0.17 ± 0.02 and 0.19 ± 0.02, respectively for SCS 1 , SCS 2 and SCS 3 . Udder type traits had heritability estimates ranging from 0.13 ± 0.01 for UC to 0.34 ± 0.01 for FTL. The genetic correlations between lactation SCS ranged from 0.82 ± 0.04 to 0.99 ± 0.03 for correlations of SCS 3 with SCS 1 and SCS 2 , respectively. Genetic correlations between SCS and udder type traits were in the range -0.01 ± 0.07 between FUA and SCS 3 to -0.38 ± 0.04 between UD and SCS 1 and SCS 2 . Slow genetic progress is expected when selection is applied independently on SCS and udder type traits, due to the generally low heritability estimates. Low, shallow udders with narrowly placed teats are associated with low SCS in the South African Holstein population. _______________________________________________________________________________________

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Genetic Parameters of Dairy Character, Protein Yield, Clinical Mastitis, and Other Diseases in the Danish Holstein Cattle

Cited by 68 publications

References 28 publications

An analysis of the genetic relationship between udder health and udder conformation traits in South African Jersey cows

An analysis of the genetic relationship between udder health and udder conformation traits in South African Jersey cows

Heritabilities and genetic correlations of lactational and daily somatic cell score with conformation traits in Polish Holstein cattle

Genetic analysis of somatic cell score and udder type traits in South African Holstein cows

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