Genetic parameters and breeding values for linear type traits in the Haflinger horse

The Italian Heavy Draught Horse (IHDH) breed is selected based on linear type traits (LTT) evaluated at young age on six-month-old foals. However, animals retained for reproduction are scored also at adults age (about 30 months), and the evaluation is mandatory for the final official admission to the stud book of candidate mares and stallions. This study aimed to estimate genetic parameters of LTT scored at 30 months to consider if they are feasible for selection instead of using foal data and to reduce costs of selection plan. Data included 19 years of evaluation for 14 LTT and an overall score. Analyses were performed on 5835 females and 856 males via animal model. The heritability ranged from 0.03 (upper line length) to 0.40 (frame size). Traits of selection interest (head size and expression; temperament/movement; fleshiness; fore diameter; rear diameter) reported heritability between 0.21 and 0.31. High genetic correlations were obtained among traits related to muscular development, 0.73 on average. Positive genetic trends were found in traits of selection interest, already selected from foal type trait data. Accounting for genetic parameters estimated in adult animals instead in foals is feasible in IHDH selection.

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Estimation of the effects of some environmental factors and genetic parameters of linear type traits in Holstein cows of Iran

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200012953 ◽

2003 ◽

Vol 2003 ◽

pp. 136-136

Author(s):

Ali Toosi ◽

F. Eftekhari

Keyword(s):

Environmental Factors ◽

Dairy Cattle ◽

Genetic Parameters ◽

Holstein Cows ◽

Yield Traits ◽

Linear Type ◽

Type Traits

The primary emphasis in dairy cattle selection is for yield traits because highest producing cows usually are more profitable. Selection on yield traits alone could decrease merit for other traits. Selection on type traits associated with increased herd life may be benefical to decrease involuntry culling and increase profitability. One of the primary reasons for collecting and utilizing information on type is to aid breeders in selecting profitable, functional cows. So that early culling for causes unrelated to yield (involuntry culling) can be avoided [Misztal et al, 1992]. The objectives of the present study were to evaluate the effects of some environmental factors on and to estimate genetic parameters of some type traits.

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Genetic parameters for locomotion and composite type traits for the Jersey and Guernsey dairy breeds in the United Kingdom (UK)

Proceedings of the British Society of Animal Science ◽

10.1017/s1752756200012151 ◽

2003 ◽

Vol 2003 ◽

pp. 56-56

Author(s):

M.F. Paget ◽

G.J.T. Swanson ◽

R.A. Mrode

Keyword(s):

Somatic Cell Count ◽

Genetic Parameters ◽

Good Evidence ◽

Linear Type ◽

The United Kingdom ◽

Composite Type ◽

Selection Indices ◽

Type Traits ◽

The Uk ◽

Genetic Evaluations

There is growing interest in the dairy industry to broaden breeding objectives by incorporating health and welfare traits into selection indices. Although these traits are difficult to measure directly, there is good evidence to show that some linear type traits are genetically correlated with certain health and welfare traits, e.g. udder-type with somatic cell count (Mrode, Swanson and Lindberg, 1999) and locomotion with lameness (Boelling, 1996). Linear and composite type traits, such as locomotion and the feet and legs and mammary system composites, have been proposed for inclusion in a future modification to the UK Profitable Life Index (PLI). The objective of this study was to estimate genetic parameters of locomotion and composite traits for application in UK national dairy genetic evaluations for Jerseys and Guernseys.

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Estimation of genetic parameters for linear type traits in the population of sport horses in the Czech Republic

Livestock Science ◽

10.1016/j.livsci.2017.05.012 ◽

2017 ◽

Vol 202 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

A. Novotná ◽

A. Svitáková ◽

Z. Veselá ◽

L. Vostrý

Keyword(s):

Czech Republic ◽

Genetic Parameters ◽

Linear Type ◽

The Czech Republic ◽

Type Traits ◽

Estimation Of Genetic Parameters

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Predicting breeding values for herd life of Holstein-Friesian dairy cattle from lifespan and type

Animal Science ◽

10.1017/s135772980003280x ◽

1998 ◽

Vol 67 (3) ◽

pp. 405-411 ◽

Cited By ~ 19

Author(s):

S. Brotherstone ◽

R. F. Veerkamp ◽

W. G. Hill

Keyword(s):

Genetic Correlations ◽

Linear Type ◽

Breeding Values ◽

Individual Traits ◽

Holstein Friesian ◽

Type Traits ◽

Type Data ◽

The Individual ◽

Indirect Information ◽

Type Information

AbstractData comprised information on herd life from two different sources: actual lifespan and type data. The optimum way of predicting breeding values (BVs) for herd life from both these sources is a multivariate best linear unbiased predictor (BLUP) analysis of lifespan and the linear type traits most closely related to it. To reduce computing requirements, we suggest a bivariate BLUP analysis, where the direct information is lifespan, measured in lactations and the indirect information is a phenotypic index of type traits weighted by their economic values. Such an index is shown to be almost as efficient as using the individual traits.Genetic correlations between functional lifespan and the linear type traits were estimated, and based on these foot angle (rg = 0·22) udder depth (rg = 0·24) and teat length (rg = -0·44) were chosen to predict herd life. Breeding values for herd life were predicted in a BLUP analysis for around 500 000 heifers. The traits were lifespan and the phenotype index offoot angle, udder depth and teat length. For bulls with a minimum of 10 daughters BVs ranged from -0·9 lactations to +1·0 lactations, indicating a difference of approximately one lactation between the daughters of extreme bulls. For sires with at least 50 daughter records for lifespan, type information contributed little to the accuracy of herd life BVs.

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