Estimation of genetic parameters and (co)variance components for weaning traits of Charolais population in Hungary

Abstract. Weaning performance of 10 808 purebred offsprings (4991 male and 5817 female) of 80 sires in 13 farms were analised using animal model. Heritability, breeding value, (co)variance components for weaning weight (WW), preweaning daily gain (PDG), 205-day weight (CWW) were calculated. Farm, parity, year of birth, season of birth, sex were treated as fixed, and the maternal permanent environment was treated as random effects. In case of WW and PDG, the age of the calves at weaning was fitted as a covariant. Data were analyzed with MTDFREML (Boldman et al. 1993) program. The overall mean value and standard deviation of WW, PDG and CWW were 221±47 kg, 1,111±0.21 kg/day and 226±42 kg, respectively. The age of the calves at weaning was 202 days. The direct heritability (h2d) of WW and PDG were 0.57±0.08, 0.49±0.07 and CWW was 0.44±0.06, respectively. The maternal heritability (h2m) of these traits were 0.32±0.09, 0.33±0.10 and 0.33±0.09, respectively. The direct-maternal correlations (rdm) were strong and negative. The medium heritability estimates for direct effects suggest that progeny tests should be used in this population to increase genetic improvement.

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Parámetros genéticos y tendencias para características de crecimiento en el ganado criollo sanmartinero en los Llanos Orientales de Colombia

Ciencia y Tecnología Agropecuaria ◽

10.21930/rcta.vol10_num2_art:142 ◽

2009 ◽

Vol 10 (2) ◽

pp. 196 ◽

Cited By ~ 1

Author(s):

Rodrigo Martínez ◽

Guillermo Onofre ◽

Nelson Polanco

Keyword(s):

Animal Model ◽

Birth Weight ◽

Environmental Effects ◽

Genetic Parameters ◽

Growth Traits ◽

Genetic Change ◽

Direct Effects ◽

Creole Cattle ◽

Maternal Heritability ◽

Daily Gain

El objetivo de este trabajo fue estimar parámetros genéticos para características de crecimiento y la tendencia de sus valores genéticos en una población de la raza bovina criolla sanmartinero, localizada en el departamento del Meta, Colombia. Se utilizó un modelo animal con efectos directos, maternos y de ambiente permanente y se analizaron las características peso al nacimiento (PN), peso al destete (PD) (ajustado a 240 d.), peso a los 16 meses (P16m), ganancia diaria de peso al destete (GPD) y ganancia diaria de peso desde el destete a los 16 meses (GP16m). Se analizaron 2.812 registros productivos de animales y se encontraron valores de heredabilidad directa moderados, variando desde 0,16 hasta 0,37 para GP16m y GPD respectivamente. Los valores de heredabilidad directa siempre fueron mayores que los de heredabilidad materna y los efectos de ambiente permanente variaron entre 0,024 ± 0,033 para PN hasta 0,067 ± 0,041 para P16m; los valores de repetibilidad fueron superiores para las características de PD (0,41) y GPD (0,37). Los valores genéticos anuales promedio para los efectos directos presentaron en general valores positivos, lo que muestra una tendencia creciente aunque con una alta variación a través de los años; por su parte, los valores genéticos maternos anuales promedio presentaron valores cercanos a cero, aunque en general su tendencia también fue creciente. A pesar de tratarse de un núcleo de conservación, donde no se ha dado selección para estas características, se encontró una tendencia genética que indica un cambio genético positivo. Genetic parameters and trends for growth traits in creole cattle sanmartinero in the eastern savannas in Colombia The aim of this work was to estimate the genetic parameters for growth traits and the tendency of their genetic values in a population of Bovine Creole cattle Sanmartinero, located in Meta, Colombia. Was used an animal model with direct and maternal effects as well as a permanent environmental effects and were analyzed birth weight, weaning weight, (adjusted at 240 d), weight at 16 months, weaning daily gain, and daily gain at 16 months. Were analyzed a total of 2812 productive records from animals and were found direct heritability moderate values, ranging between from 0.16 to 0.3 for GP16m and GP respectively. The direct heritability values always were higher than the maternal heritability values and the permanent environmental effects ranged between 0.024 ± 0.033 for PN until 0.067 ± 0.041 for P16m, but the repeatability values were higher for PD (0.41) and GPD (0.37) traits. With reference to the tendency of average yearly genetic values for direct effects, always displayed positive values and a increase tendency however a high variation between the years were found, conversely to the genetic maternal values than displayed generally values near to zero, but their tendency also was to increase. Is noteworthy than in spite of to be a conservation herd, than do not has been used for selection programs for those traits, was found a genetic tendency that suggest a positive genetic change.

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Weaning results of beef Hungarian Fleckvieh calves 2. Genetic parameters, breeding values

Archives Animal Breeding ◽

10.5194/aab-53-26-2010 ◽

2010 ◽

Vol 53 (1) ◽

pp. 26-36 ◽

Cited By ~ 1

Author(s):

S. Bene ◽

I. Füller ◽

A. Fördős ◽

F. Szabó

Keyword(s):

Genetic Parameters ◽

Correlation Coefficients ◽

Breeding Value ◽

Phenotypic Variance ◽

Weaning Weight ◽

Breeding Values ◽

Estimated Breeding Values ◽

Genetic Value ◽

Maternal Heritability ◽

Daily Gain

Abstract. Weaning weight, preweaning daily gain and 205-day weight of Hungarian Fleckvieh calves (n=8 929, bulls =4 539, heifers =4 390) born from 232 sires between 1980 and 2003 were examined. Variance, covariance components and heritability values and correlation coefficients were estimated. The effect of the maternal permanent environment on genetic parameters and breeding values were examined. Two animal models were used for breeding value estimation. The direct heritability (hd2) of weaning weight, preweaning daily gain and 205-day weight was between 0.37 and 0.42. The maternal heritability (hm2) of these traits was 0.06 and 0.07. The direct-maternal correlations (rdm) were medium and negative −0.52 and −0.74. Contribution of the maternal heritability and maternal permanent environment to phenotype is smaller than that of direct heritabilities (hm2+c2< hd2). The ratio of the variance of maternal permanent environment in the phenotypic variance (c2) changed from 3 to 6 %. Estimated breeding values changed whether the permanent environmental effect of dam wasn’t taken into consideration but the rank of the animals was not modified. The genetic value for weaning results of Hungarian Fleckvieh population has increased since 1997.

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A note on genetic parameters and accuracy of estimated breeding values in honey bees

Genetics Selection Evolution ◽

10.1186/s12711-019-0510-6 ◽

2019 ◽

Vol 51 (1) ◽

Cited By ~ 6

Author(s):

Evert W. Brascamp ◽

Piter Bijma

Keyword(s):

Honey Bees ◽

Variance Components ◽

Genetic Parameters ◽

Additive Genetic Variance ◽

Breeding Value ◽

Phenotypic Variance ◽

Breeding Values ◽

Estimated Breeding Values ◽

Additive Genetic Relationship ◽

The Relationship

Abstract Background In honey bees, observations are usually made on colonies. The phenotype of a colony is affected by the average breeding value for the worker effect of the thousands of workers in the colony (the worker group) and by the breeding value for the queen effect of the queen of the colony. Because the worker group consists of multiple individuals, interpretation of the variance components and heritabilities of phenotypes observed on the colony and of the accuracy of selection is not straightforward. The additive genetic variance among worker groups depends on the additive genetic relationship between the drone-producing queens (DPQ) that produce the drones that mate with the queen. Results Here, we clarify how the relatedness between DPQ affects phenotypic variance, heritability and accuracy of the estimated breeding values of replacement queens. Second, we use simulation to investigate the effect of assumptions about the relatedness between DPQ in the base population on estimates of genetic parameters. Relatedness between DPQ in the base generation may differ considerably between populations because of their history. Conclusions Our results show that estimates of (co)variance components and derived genetic parameters were seriously biased (25% too high or too low) when assumptions on the relationship between DPQ in the statistical analysis did not agree with reality.

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Evaluación fenotípica y genética para características de crecimiento en la raza criolla colombiana Costeño con Cuernos

Ciencia y Tecnología Agropecuaria ◽

10.21930/rcta.vol7_num2_art:65 ◽

2007 ◽

Vol 7 (2) ◽

pp. 12 ◽

Cited By ~ 3

Author(s):

Rodrigo Alfredo Martínez ◽

Juan Esteban Pérez ◽

Teófilo Herazo

Keyword(s):

Birth Weight ◽

Variance Components ◽

Fixed Effects ◽

Genetic Parameters ◽

Growth Traits ◽

Phenotypic Correlation ◽

Phenotypic Variance ◽

Direct Effects ◽

Weaning Weight ◽

Number Of Births

Se establecieron componentes de varianza, así como parámetros fenotípicos y genéticos, respecto de las variables ‘peso al nacimiento’, ‘peso al destete’ (ajustado a los 270 días) y ‘peso a los 480 días’ en un hato del ganado criollo colombiano Costeño con Cuernos. Se analizaron 2.281 registros de pesos al nacer, 1.722 de pesos al destete y 1.086 de pesos ajustados a los 480 días utilizando la metodología de máxima verosimilitud restringida (DFREML). También se ajustó un modelo animal que incluyó efectos genéticos directos, maternos y de ambiente permanente, asumiendo como efectos fijos el año de nacimiento, el sexo del ternero y el número de partos de la madre; finalmente, se estimaron los parámetros genéticos ‘heredabilidad’, ‘repetibilildad’ y se establecieron correlaciones genéticas y fenotípicas. Se reportan bajas estimaciones de heredabilidad de los efectos directos, que varían entre 0,17 ± 0,001 y 0,21 ± 0,074 para los pesos al nacer y al destete, respectivamente; así mismo, fue baja la heredabilidad de los efectos genéticos maternos con relación al peso al nacimiento, aunque estos estimados aumentaron respecto de los pesos al nacer y al destete. Las correlaciones entre efectos directos y maternos fueron negativas, pero el mayor valor se encontró para el peso al nacimiento (-0,89). La contribución del ambiente permanente como proporción de la varianza fenotípica total fue baja y disminuyó a medida que aumentó la edad del animal. Genetic and phenotypic evaluation to characterize growth traits of the native Colombian breed Costeño con CuernosFor a herd of native Colombian breed of cattle -Costeño con Cuernos (CCC)- estimates of variance components for phenotypic and genetic parameters were obtained for birth weight, weight at weaning (adjusted to 270 days) and weight at 480 days. Using the restricted maximum likelihood (REMI) methodology, 2281 birth weight records (PN), 1722 weaning weight records and 1086 weight records adjusted to 480 days were analyze by fitting a model which included direct and maternal genetics effects as well as permanent environmental effects, assuming that fixed effects were year of birth weight, calf gender and the mother number of births. The genetic parameters for heritability, repeatability, genetic and phenotypic correlation were estimated and genotypic and phenotypic correlation was established. Heritability estimates for direct effects are low and range from 0.17 ± 0.001 and 0.21 ± 0.074 for birth and weaning weight respectively; while estimates for maternal genetics effects were also low for PN, they were higher for weaning weight and weight at 480 days. There was a negative correlation between direct and maternal effects, and the higher value was for PN (-0.89). The contribution of the variable permanent environment measured as the contribution of the phenotypic variance was low and diminished as animal age increased.

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(Co)variance components and genetic parameters for growth rate and Kleiber ratio in fat-tailed Mehraban sheep

Archives Animal Breeding ◽

10.7482/0003-9438-56-055 ◽

2013 ◽

Vol 56 (1) ◽

pp. 564-572 ◽

Cited By ~ 1

Author(s):

F. Ghafouri-Kesbi

Keyword(s):

Growth Rate ◽

Variance Components ◽

Genetic Parameters ◽

Average Daily Gain ◽

Genetic Correlations ◽

Phenotypic Variance ◽

Genetic Progress ◽

Kleiber Ratio ◽

Derivative Free ◽

Maternal Heritability

Abstract. The aim of the present study was to estimate (co)variance components and genetic parameters for average daily gain from birth to weaning (ADGa), weaning to 6 months (ADGb), weaning to 9 months (ADGc), 6 months to 9 months (ADGd) and corresponding Kleiber ratios (KRa, KRb, KRc and KRd) in Mehraban sheep. A derivative-free algorithm combined with a series of six univariate linear animal models was used to estimate phenotypic variance and its direct, maternal and residual components. In addition, bivariate analyses were done to estimate (co)variance components between traits. Estimates of direct heritability (h2) were 0.10, 0.11, 0.16, 0.09, 0.13, 0.13, 0.15 and 0.08 for ADGa, ADGb, ADGc, ADGd, KRa, KRb, KRc and KRd, respectively and indicate that in Mehraban sheep genes contribute very little to the variance of the growth rate and Kleiber ratio. Estimates of maternal heritability (m2) were 0.10, 0.08 and 0.05 for ADGa, KRa and KRb, respectively. Direct additive genetic correlations ranged from −0.32 (KRa-KRd) to 0.99 (ADGb-KRb) and phenotypic correlations ranged from −0.53 (ADGa- ADGd) to 0.99 (ADGa-KRa). Estimates of direct heritability and genetic correlations show that genetic improvement in efficiency of feed utilization through selection programmes is possible, though it would generate a relatively slow genetic progress.

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Estimates of (co)variances due to direct and maternal effects for body weights in Timahdite sheep

Animal Science ◽

10.1017/s1357729800052553 ◽

2002 ◽

Vol 74 (3) ◽

pp. 409-414 ◽

Cited By ~ 18

Author(s):

I. Boujenane ◽

J. Kansari

Keyword(s):

Animal Model ◽

Genetic Parameters ◽

Genetic Correlations ◽

Early Growth ◽

Genetic Effects ◽

Direct Effects ◽

Genetic Progress ◽

Body Weights ◽

Cross Correlations ◽

Maternal Heritability

AbstractGenetic parameters for body weights in Timahdite sheep were estimated using records of 10370 lambs from the ‘Société Nationale de Développement de l’Elevage’ born in 1988-89 to 1998-99. An animal model with derivativefree restricted maximum likelihood procedures was used. Random effects were direct and maternal additive genetic, maternal permanent environmental, and error. Direct and maternal heritability estimates were 0·05 and 0·05 for birth weight, 0·02 and 0·07 for weight at 30 days, 0·07 and 0·08 for weight at 70 days, 0·06 and 0·01 for weight at 90 days. Estimates of fraction of variance due to maternal permanent environmental effects were close to zero, except for weight at 90 days. Genetic correlations between direct and maternal genetic effects were –0·55, –0·51, –0·50 and –0·17 for body weights at birth, 30, 70 and 90 days, respectively. Estimates of direct genetic correlations among body weights were positive and high, ranging from 0·69 to unity. Phenotypic correlations were positive and moderate to high, being lower than their corresponding direct genetic correlations. Estimates of correlations between maternal genetic effects among weights were positive and high, varying from 0·79 to unity. Cross-correlations between direct genetic effects for one weight and maternal genetic effects for another weight were consistently negative, ranging from –0·05 to –0·63. These results indicate that selecting for improved maternal and/or direct effects in Timahdite sheep is expected to generate only slow genetic progress in terms of early growth.

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Genetic parameter estimates for early growth traits in Naeini goat

Animal Production Science ◽

10.1071/an12045 ◽

2012 ◽

Vol 52 (11) ◽

pp. 1046 ◽

Cited By ~ 7

Author(s):

Hasan Baneh ◽

Mojtaba Najafi ◽

Ghodrat Rahimi

Keyword(s):

Environmental Effects ◽

Variance Components ◽

Genetic Parameters ◽

Growth Traits ◽

Genetic Parameter ◽

Average Daily Gain ◽

Parameter Estimates ◽

Estimate Variance ◽

Daily Gain ◽

Birth Type

The present study was carried out to estimate variance components for growth traits in Naeini goats. Bodyweight records were collected for two flocks under supervision of the Agriculture Organisation of the Esfahan province between 2000 and 2007. Investigated traits were birthweight (BW; n = 2483), weaning weight (WW; n = 1211) and average daily gain from birth to weaning (ADG; n = 1211). Environmental effects were investigated using fixed-effect models, while (co)variance components and genetic parameters were estimated with single- and three-trait analyses using REML methods and WOMBAT software. Six different animal models were fitted to the traits, with the best model for each trait determined by log-likelihood ratio tests (LRT). All traits were significantly influenced by herd, birth year, sex of the kid, birth type and dam age (P < 0.01). On the basis of LRT, maternal permanent environmental effects (c2) were significant for WW and ADG, while BW was affected only by direct genetic effects. Direct heritability estimates for BW, WW and ADG were 0.25 ± 0.05, 0.07 ± 0.06 and 0.21 ± 0.11, respectively. The estimate of c2 was 0.16 ± 0.06 for both WW and ADG. Estimates of genetic correlation for BW–ADG, BW–WW and ADG–WW were 0.49, 0.61 and 0.94, respectively. The estimated phenotypic correlations were positive and were between 0.03 (BW–ADG) and 0.95 (ADG–WW). These results indicate that selection can be used to improve growth traits in this goat breed.

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Estimation of genetic parameters for growth related traits at different stages of development in Paralichthys olivaceus (Temminck & Schlegel, 1846)

Indian Journal of Fisheries ◽

10.21077/ijf.2016.63.3.49593-09 ◽

2016 ◽

Vol 63 (3) ◽

Cited By ~ 4

Author(s):

F. Liu ◽

S. L. Chen ◽

L. Wang ◽

Y. P. Zhang ◽

Y. S. Tian ◽

...

Keyword(s):

Body Weight ◽

Growth Stage ◽

Genetic Parameters ◽

Developmental Stages ◽

Growth Traits ◽

Paralichthys Olivaceus ◽

Correlation Coefficients ◽

Breeding Value ◽

Estimated Breeding Value ◽

Estimation Of Genetic Parameters

Genetic parameters of growth traits at different growing stages of Paralichthys olivaceus (Temminck and Schlegel, 1846) were estimated using 30 families. The estimates of heritability for body weight at four developmental stages viz., 210, 450, 720 and 830 days of age, varied from 0.12 to 0.37. The heritability at 720 days of age was the lowest and that of 450 days was the highest. The maternal effect was 0.08 at 210 days, 0.03 at 450 days and almost zero (8.89 E-8 and 2.40 E-7) at 720 and 830 days. Correlation coefficients of the estimated breeding value (EBV) and phenotypic value (PV) of body weight at different developmental stages were 0.470-0.803, which were highly significant (p<0.01). Correlation of estimated breeding value (EBV) and phenotypic value (PV) was the highest at 210 days of age and the lowest at 720 days. Genetic correlation among the four stages showed large variation (0.339-0.811), which were highly significant except that of 210 and 830 days. The value and accuracy of estimating genetic parameters for growth traits at different stages was different. Therefore, the growth stage should be taken into account when designing a breeding program for growth traits in P. olivaceus.

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