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

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.

scholarly journals Genetic Parameters for Linear Type Traits and Milk, Fat, and Protein Production in Holstein Cows in Brazil

2015 ◽  
Vol 28 (4) ◽  
pp. 476-484 ◽  
Author(s):  
Rafael Viegas Campos ◽  
Jaime Araujo Cobuci ◽  
Elisandra Lurdes Kern ◽  
Cláudio Napolis Costa ◽  
Concepta Margaret McManus
Keyword(s):  
Milk Fat ◽  
Protein Production ◽  
Genetic Parameters ◽  
Holstein Cows ◽  
Linear Type ◽  
Type Traits

Adjustment of Lactation Number and Stage on Informal Linear Type Traits of Holstein Dairy Cattle

2010 ◽  
Vol 52 (6) ◽  
pp. 467-473 ◽  
Author(s):  
Chang-Hee Do ◽  
Beong-Soon Jeon ◽  
Byung-Chan Sang ◽  
Dong-Hee Lee ◽  
Ronald E. Pearson
Keyword(s):  
Dairy Cattle ◽  
Linear Type ◽  
Type Traits

Study on Genetic Parameters for Linear Type Traits in Hanwoo Cows

2014 ◽  
Vol 25 (1) ◽  
pp. 7-13
Author(s):  
Chungil Cho ◽  
◽  
Taejeong Choi ◽  
Kwanghyun Cho ◽  
Jaegwan Choi ◽  
...  
Keyword(s):  
Genetic Parameters ◽  
Linear Type ◽  
Type Traits

Genetic parameters for linear type traits in the Rendena dual-purpose breed

2013 ◽  
Vol 131 (1) ◽  
pp. 27-35 ◽  
Author(s):  
S. Mazza ◽  
N. Guzzo ◽  
C. Sartori ◽  
D.P. Berry ◽  
R. Mantovani
Keyword(s):  
Genetic Parameters ◽  
Linear Type ◽  
Dual Purpose ◽  
Type Traits

scholarly journals Estimation of genetic parameters and relationships between type traits and milk yield of Holstein cows in Turkey

2021 ◽  
Vol 73 (6) ◽  
pp. 1371-1380
Author(s):  
O. Ermetin ◽  
B. Dağ
Keyword(s):  
Milk Yield ◽  
Selection Criteria ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Scoring Systems ◽  
Holstein Cows ◽  
Phenotypic Correlations ◽  
Type Traits ◽  
Final Score ◽  
Selection For

ABSTRACT In this study, milk yield, reproductive yield, and type traits of 533 Holstein cows in the first lactation raised in 54 farms were examined. In the three-year study, phenotypic (rP) and genetic (rG) correlations between type traits and milk yield were estimated based on the variance elements and heritability of the type traits of Holstein cows in the first lactation. Linear identification and scoring systems have been applied to classify the cows according to type traits. Heritability and correlations were estimated with ASREML models. The type traits included stature, angularity, rump width, hocks, rear udder height, central ligament, teat length, body capacity, feet and legs, udder composite and final score for genetic correlations with 305-day milk yield were estimated as -0.49, -0.14, -0.93, 0.35, 0.40, 0.11, -0.65, 0.70, 0.31, 0.54, and 0.70, for phenotypic correlations were estimated as 0.28, 0.28, 0.30, 0.21, 0.35, 0.39, -0.06, 0.46, 0.48, 0.56, and 0.58 respectively. Among the phenotypic correlations between the type traits, especially the phenotypic correlations between the final score and various type traits were found to be high and significant. The fact that these traits are in high correlation with other traits and milk yield may enable these to be used as indirect selection criteria in the selection for milk yield.

scholarly journals Genetic Parameters of Linear Type Traits Scored at 30 Months in Italian Heavy Draught Horse

Animals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1099
Author(s):  
Fabio Folla ◽  
Cristina Sartori ◽  
Enrico Mancin ◽  
Giuseppe Pigozzi ◽  
Roberto Mantovani
Keyword(s):  
Animal Model ◽  
Genetic Parameters ◽  
Genetic Correlations ◽  
Line Length ◽  
Young Age ◽  
Head Size ◽  
Linear Type ◽  
Frame Size ◽  
Type Traits ◽  
Genetic Trends

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.

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

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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