Evaluation of a local goat population for fertility traits aiming at the improvement of its economic sustainability through genetic selection

Atoui, Ahlem; Carabaño, M. J.; Najari, Sghaier

doi:10.5424/sjar/2018162-12604

Cited by 15 publications

(15 citation statements)

References 14 publications

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“…To date, there are no works on the estimation of genetic parameters of reproductive traits in goat using threshold RRM. In previous studies conducted in other goat breeds, a wide range of h 2 values has been reported for LS (Kasap et al 2013 in Saanen;Atoui et al 2018 in local Tunisian breed; Abdoli et al 2019 in Markhoz), but all these estimates have been obtained with linear repeatability models. For NBA, there are no available studies on estimating its genetic parameters, and this work is the first to estimate it in goat using RRM.…”

Section: Resultsmentioning

confidence: 98%

Genetic analysis of litter size and number of kids born alive across parities in Spanish goat breeds using a random regression model

Ziadi

Muñoz-Mejías

Rodríguez

et al. 2021

Italian Journal of Animal Science

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Genetic parameters of litter size (LS) and number of kids born alive (NBA) were estimated across parities in Florida and Payoya goat breeds using a threshold random regression model (RRM). We analysed the reproductive records for the Florida and Payoya breeds separately, and a total of 130.849 and 67.478 reproductive records from the first to the seventh parities from Florida and Payoya, respectively, were included in the analysis. Random regressions on Legendre polynomials of standardised parity were included for permanent environmental and additive genetic effects. We based our estimation of all the covariance components on Bayesian inference under categorical distribution and considered heterogeneous residual variances in the model. The estimates of heritabilities ranged from null to 0.37 for LS and from 0.02 to 0.20 for NBA, while the repeatability estimates were between 0.008-0.60 and 0.03-0.44 for LS and NBA, respectively. Phenotypic correlations within-trait along parities ranged widely from À0.31 to 0.97, while the genetic correlations within-trait through parities showed a wider range and magnitude of values, from À0.98 to 0.99 for LS and from À0.72 to 0.99 for NBA. The estimates of genetic correlations between LS and NBA in the different parities were positive in the first two parities and negative in the later ones. Due to the noticeable changes in variance and the incomplete genetic correlations, the use of a random regression model to analyse LS and NBA is recommended in goat breeds. HIGHLIGHTSA bivariate threshold random regression model has been used for the first time to estimate genetic parameters of litter size and number of kids born alive across parities in Spanish goat breeds. The evolution of genetic parameters along parities is different between Florida and Payoya that have different production systems, being more intensive in the case of the Florida breed. Estimates of variance were not constant across parities for both traits and breeds. Genetic correlations within-trait across parities were different from unity. Thus, LS and NBA should be treated as different traits in successive parities. Given that the estimates of variance and covariances are not constant across parities for both traits and breeds, the use of RRM is highly recommended.

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Section: Resultsmentioning

confidence: 98%

Genetic analysis of litter size and number of kids born alive across parities in Spanish goat breeds using a random regression model

Ziadi

Muñoz-Mejías

Rodríguez

et al. 2021

Italian Journal of Animal Science

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“…because the breeders did not make the selection with considering prolificacy potential but solely on external performance, especially in buck selections with a natural mating system. The variation of a trait in a livestock population, including genetic variation, was significant as an asset for selection to increase the livestock's genetic trend in the future for economic sustainability (Hassan et al, 2016 andAtoui et al, 2018).…”

Section: Morphometric Body Of Ileg Doesmentioning

confidence: 99%

The Prolific Variation, Body Morphometrics, and Breeding Value of Indonesian Local Etawah Goat Based in East Java

Mudawamah

Ciptadi

Retnaningtyas

2021

JAP

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A crucial trait of a high economic value of goats is calving to more than one kid (prolificacy potency). The high prolificacy potency (> 1 kid) has a higher income compared to single kids. This study described the potential of Indonesian Local Etawah Goat (ILEG) for prolific trait and the morphometric of body and breeding values in various environments as a basis for selection. It involved smallholder farmers who breed ILEG does from 14 villages in East Java. The research was conducted on a field survey to obtain primary data about the phenotypic superior ILEG goats based on the status of the prolific trait. The study used 520 does with 1347 prolific records obtained. The results showed that the prolificacy values ranged from 2.12-1.42 heads/calving (medium to high category). The variation of prolificacy was 0.53, and the breeding values of the prolificacy trait were 1.48-1.74. The average of body morphometrics was varied with the following details. Chest circumference was 81.06 + 4.63 cm, body length was 76.64 + 4.33 cm, shoulder height was 75.34 + 5.83 cm and ear length were 27.44 + 3.02 cm. This study concluded that the prolific rate was medium to high category. The prolific variation was higher than body morphometry variation, and the prolificacy EBVs of breeding villages divided into four unique pattern boxplots. The prolific trait could be the basis for new considerations in the ILEG breeding program, either through selection or mating.

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“…All animals were provided with water allowed twice a day, before and after grazing (Atoui et al 2018;Atoui et al 2019).…”

Section: Animals and Managementmentioning

confidence: 99%

On the Modelling of Weights of Kids to Enhance Growth in a Local Goat Population Under Tunisian Arid Conditions. The Maternal Effects.

Atoui

Najari

Díaz

et al. 2021

Preprint

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To provide the local goat population with an adequate genetic management scheme under arid environment, the study aimed to evaluate the use of fourteen alternative models attempting to evaluate to dissection of additive genetic (AG) and permanent environmental (PE) components of direct and maternal effects and their consequences on estimated breeding values. Records of 938 local kids over a period of 16 years were used in this study. Data were split into four groups corresponding to four periods along the weight recording period. Periods 1/2/3/4 contained weights in an interval with upper-lower limits of 1-20/25-60/65-120/125-150 days of age. Models including or ignoring maternal genetic or permanent environmental effects were fitted for all traits. For all periods, the best models were those including the AG component for both direct and maternal effects and the direct PE effect. Heritability estimates of both the direct and maternal effects ranged from low (0.02 for maternal heritability in P1) to moderate (0.17 for direct and maternal heritability in P2 and P3). Period 1 showed the lowest values for heritability of both direct and maternal effects, which also showed the largest estimate of the ratio of residual to total variance (around 0.2) compared with the other periods, withdecreasing ratios as age increased (from 0.13 for P2 to 0.07 for P4). Both direct and maternal EBVs showed high correlations between models fitting direct AG and PE effects. For direct EBVs, correlations were above 0.99, indicating that the same animals are expected to be selected under any model that includes those components, regardless of the maternal effects included. For maternal EBVs, correlations were also high, but slightly lower than for the DEBVs between models including DGP effects and maternal genetic effects. Overall, our recommendation for genetic evaluations of direct and maternal effectsin this population raised in extensive and harsh conditions is to use weight records preferably collected during the period of high milk production of dams, for which direct and maternal effects are expected to show full expression. Complete pedigrees and several generations of dam-progeny recording are needed to obtain a proper separation of environmental and genetic components.

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Evaluation of a local goat population for fertility traits aiming at the improvement of its economic sustainability through genetic selection

Cited by 15 publications

References 14 publications

Genetic analysis of litter size and number of kids born alive across parities in Spanish goat breeds using a random regression model

Genetic analysis of litter size and number of kids born alive across parities in Spanish goat breeds using a random regression model

The Prolific Variation, Body Morphometrics, and Breeding Value of Indonesian Local Etawah Goat Based in East Java

On the Modelling of Weights of Kids to Enhance Growth in a Local Goat Population Under Tunisian Arid Conditions. The Maternal Effects.

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