Impact of Type Traits on Functional Herd Life of Quebec Holsteins Assessed by Survival Analysis

Schneider, M.P. del; Dürr, João Walter; Cue, R.I.; Monardes, H.G.

doi:10.3168/jds.s0022-0302(03)74021-1

Cited by 42 publications

(91 citation statements)

References 10 publications

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“…Our estimates ranged from 0.28 to 0.54, while the corresponding range for literature estimates was -0.07 to 0.21 (Cruickshank et al, 2002;Vukasinovic et al, 2002;Tsuruta et al, 2005). Buenger et al (2001), Larroque & Ducrocq (2001), and Schneider et al (2003) reported that cows with extremely close rear teats were more likely to be culled than cows with extremely wide rear teats.…”

Section: Resultsmentioning

confidence: 45%

“…The highest genetic relationships were generally found for udder attachment, udder depth, teats, and angularity of rear legs (Vukasinovic et al, 2002;Strapák et al, 2005;Bouška et al, 2006;Zavadilová et al, 2009). In a study on Quebec Holsteins, Schneider et al (2003) found that udder and stature had the strongest relationship with functional herd life, compared with other structural body traits. Furthermore, Bouška et al (2006) reported positive relationships between udder traits in particular and herd life for Czech Fleckvieh cows.…”

Section: Introductionmentioning

confidence: 97%

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Relationships between functional herd life and conformation traits in the South African Jersey breed

Toit¹,

Wyk²,

Maiwashe³

2012

SA J. An. Sci.

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________________________________________________________________________________ AbstractThe genetic relationship between conformation traits and functional herd life of the South African Jersey population was investigated. Data on conformation traits (n = 46 238) and functional herd life (n = 90 530) on registered South African Jersey cows calving between 1989 and 2008 were obtained from the Integrated Registration and Genetic Information System. Conformation traits were scored using a subjective linear scoring system ranging from 1 to 9, except for foot angle, with a maximum score of 8. Conformation traits included stature, chest width, body depth, dairy strength, rump angle, thurl width, rear leg side view, foot angle, fore udder attachment, rear udder height, rear udder width, udder support, udder depth, front teat placement, rear teat placement and front teat length. Genetic correlations between conformation traits and functional herd life were estimated by a series of bivariate analyses. Significant moderate to strong positive genetic correlations between most udder traits and functional herd life (0.23 to 0.63) were estimated. The most important udder traits related to functional herd life were fore udder attachment, rear udder height and udder depth. Most of the body structure traits had a low to moderate negative correlation with functional herd life (-0.04 to -0.27). However, rump angle and foot angle were estimated to have a moderate positive genetic correlation with functional herd life. The genetic relationships between functional herd life and conformation traits in the South African Jersey breed indicate that conformation traits could be used to enhance the accuracy of genetic evaluation for functional herd life. It is therefore recommended that current national genetic evaluation for functional herd life in the South African Jersey breed should include conformation traits. ________________________________________________________________________________

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Section: Resultsmentioning

confidence: 45%

Section: Introductionmentioning

confidence: 97%

Relationships between functional herd life and conformation traits in the South African Jersey breed

Toit¹,

Wyk²,

Maiwashe³

2012

SA J. An. Sci.

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“…They are generally used for the national genetic evaluation as indicator traits for udder health (Boettcher et al, 1998), or to predict the length of productive life (Bünger et al, 2001;Schneider et al, 2003;Sewalem et al, 2004). Type traits have a long tradition in German dairy cattle breeding programs (Mügge et al,1999), and a high emphasis on conformation traits in current breeding goals and selection decisions was reported by Swalve and Höver (2003) and König et al (2007).…”

Section: Introductionmentioning

confidence: 99%

Genetic and environmental impact on auction prices for Holstein cows

Schierenbeck¹,

König²,

Simianer³

2009

Livestock Science

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The aim of the present analysis was to determine the impact of a variety of traits and effects (i.e. production, type, health, management effects, pedigree information) on prices of Holstein cows sold at auction, and to estimate genetic (co)variance components between type traits and auction price. Results were used to derive economic weights for type traits. Data of 1565 cows in first parity were collected at six monthly auction sales from August 2005 through January 2006. Seventeen linear type traits and body condition (scale 1 to 9), and four type composites (dairy character, body, feet and legs, and udder; scale 65 to 88) were scored by two classifiers in the auction hall before cows were sold. Analysis of variance revealed a highly significant impact (P b 0.001) of auction date, test day milk yield, stage of lactation, origin of sire, and miscellaneous defects on auction price. The most expensive cows were sold in August, they were from foreign proven sires, they had a high level of test day milk yield, and they were free from defects related to udder, feet and legs, or milkability. The feet and leg, udder, and body composite also had a significant effect on the price (P b 0.001), with higher scores being associated with higher prices. The opposite association was found for dairy character (P b 0.01). Utilizing results from regression analysis, economic weights per genetic standard deviation were highest for linear scored rear udder height (1.23 €), front teat placement (0.97 €), and strength (0.80 €), but were negative for dairy character (−0.69 €). Genetic parameters for linear type traits scored at the auction date were consistent with literature reports. Heritability for auction price was 0.27, and auction price was genetically positively related to the feet and leg (0.55), udder (0.55), and body composite (0.21). A relative breeding value for auction price was estimated for 27 influential sires, and correlated with official indices for production, conformation, somatic cell count, functional herd life, fertility, and the total net merit index. Correlations were 0. 15, 0.21, 0.11, 0.03, 0.05, and 0.19, respectively. Auction price in combination with type scores and information related to farm management provide valuable information for genetic analysis in dairy cattle, and results can be used to increase dairy cow profitability.

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“…Type traits with the greatest influence on the risk of culling in dairy cattle have been reported to be those linked to udder traits (Larroque & Ducrocq, 2001;Schneider et al, 2003;Setati et al, 2004;Bouška et al, 2006;Zavadilová et al, 2009). Udder-type traits contribute to culling, and hence affect longevity, probably through their influence on mastitis and other disease incidence.…”

Section: Type and Udder Traitsmentioning

confidence: 99%

Genetic Prediction Models and Heritability Estimates for Functional Longevity in Dairy Cattle

Imbayarwo-Chikosi¹,

Dzama²,

Halimani³

et al. 2015

SA J. An. Sci.

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Longevity is a major component of the breeding objective for dairy cattle in many countries because of its high economic value. The trait has been recommended for inclusion in the breeding objective for dairy cattle in South Africa. Linear models, random regression (RR) models, threshold models (TMs) and proportional hazard models (PH) have been used to evaluate longevity. This paper discusses these methodologies and their advantages and disadvantages. Heritability estimates obtained from these models are also reviewed. Linear methodologies can model binary and actual longevity, while RR and TM methodologies model binary survival. PH procedures model the hazard function of a cow at time t derived from survival from first calving to culling, death or censoring. It is difficult to compare methodologies for sire evaluation and ranking across countries because of the variation in the definition of longevity and the choice of model. Sire estimated breeding values (EBVs) are derived differently for the models. Sire EBVs from PH models are expressed as deviations of the culling risk from the mean of the base sires, expected percentage of daughters still alive after a given number of lactations, expected length of productive life in absolute terms or as standard deviation units. In linear, TM and RR modelling, sire EBVs for longevity have been expressed as deviations of survival from the mean estimated with Best Linear Unbiased Prediction (BLUP). Appropriate models should thus be developed to evaluate functional longevity for possible inclusion in the overall breeding objective for South African dairy cattle. ______________________________________________________________________________________

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Impact of Type Traits on Functional Herd Life of Quebec Holsteins Assessed by Survival Analysis

Cited by 42 publications

References 10 publications

Relationships between functional herd life and conformation traits in the South African Jersey breed

Relationships between functional herd life and conformation traits in the South African Jersey breed

Genetic and environmental impact on auction prices for Holstein cows

Genetic Prediction Models and Heritability Estimates for Functional Longevity in Dairy Cattle

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