Estimation of genetic parameters and genetic trends for reproductive traits in Saanen goats

Kasap, Ante; Mioč, Boro; Škorput, Dubravko; Pavić, Vesna; Antunović, Zvonko

doi:10.2298/avb1303269k

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…Results of the current study show that genetic progress of LS in Markhoz goats was actually zero during the past two decades. Similar estimate of genetic trend has been reported in Saanen goats in Croatia (Kasap et al, 2013). This observation is due to low heritability of LS and thus, unfeasibility of genetic progress by common phenotypic selection methods.…”

Section: Discussionsupporting

confidence: 83%

Genetic parameters and trends for litter size in Markhoz goats

Abdoli

Zamani

Mirhoseini

et al. 2019

Rev Colom Cienc Pecua

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Background: Prolificacy has a high economic value and is one of the most important reproduction traits in small ruminants such as Markhoz goats, which is an endangered breed. Objective: To estimate genetic, environmental and phenotypic trends, and genetic parameters for litter size (LS), as a prolificacy trait of Markhoz goat does. Methods: The study was conducted using kidding records of 3,064 Markhoz does from 1992 to 2015. Genetic parameters were estimated with a logit link function using ASReml software, fitting a repeatability animal model, with birth year, kidding year, and kidding age as fixed effects, and direct additive genetic and permanent environmental effects as random effects. Genetic, phenotypic and environmental trends were estimated by using regression of breeding value, phenotypic value and environmental deviation averages on birth year, respectively. Results: Low and negligible heritability (0.002), repeatability (0.054) and coefficient of permanent environment (0.052) were estimated for LS, which indicates low possibility to achieve rapid genetic progress through phenotypic selection. A non-significant -actually, zero- genetic trend (0.00004 heads/kidding/year), and significant negative phenotypic and environmental trends (-0.01097 and -0.01100 heads/kidding/year, respectively) were estimated in this study. Conclusion: Optimizing environmental conditions and application of high-throughput technologies in selection programs could help reducing the extinction risk of Markhoz breed.Keywords: extinction risk, genetic trend, heritability, phenotypic selection, prolificacy. Resumen Antecedentes: La prolificidad tiene un alto valor económico y es uno de los rasgos reproductivos más importantes en pequeños rumiantes, tales como la raza caprina Markhoz. que es esta en peligro de extinción. Objetivo: Estimar lastendencias genéticas, ambientales y fenotípicas, y los parámetros genéticos para el tamaño de la camada (LS), como rasgo de prolificidad de las hembras de cabras Markhoz. Métodos: Se utilizaron registros de partos de 3.064 hembras Markhoz, de 1992 a 2015. Los parámetros genéticos se estimaron con una función de enlace logit utilizando el software ASReml, ajustando un modelo animal de repetibilidad, con el año de nacimiento, el año del parto y la edad al parto como efectos fijos, y genéticos aditivos directos y efectos ambientales permanentes como efectos aleatorios. Las tendencias genéticas, fenotípicas y ambientalesse estimaron mediante la regresión del valor de la cría, el valor fenotípico y los promedios de desviación ambiental en el año de nacimiento, respectivamente. Resultados: Se estimó la heredabilidad -baja e insignificante- (0,002), repetibilidad (0,054) y coeficiente de ambiente permanente (0,052) para LS, lo que indica una baja posibilidad de lograr un progreso genético rápido a través de selección fenotípica. Se estimó una tendencia genética no significativa -de hecho, cero- (0,00004 cabezas/parto/año) y se estimaron tendencias fenotípicas y ambientales negativas significativas (-0,01097 y -0,01100 cabezas/parto/año, respectivamente) en el período estudiado. Conclusión: La optimización de las condiciones ambientales y la aplicación de tecnologías de alto rendimiento en los programas de selección podrían reducir el riesgo de extinción de la raza Markhoz.Palabras clave: heredabilidad, prolificidad, riesgo de extinción, selección fenotípica, tendencia genética. Resumo Antecedentes: Aprolificidade tem um elevado valor económico e é uma das maisimportantes características de reprodução nos pequenos ruminantes, como a raça de caprinos Markhoz, que está em perigo de extinção. Objetivo: Estimar tendências genéticas, ambientais e fenotípicas, e parâmetros genéticos para o tamanho da serapilheira (LS), como um traço de proliferação de cabras Markhoz. Métodos: Este estudo foi realizado usando registros de parto de 3.064 Markhoz entre 1992 e 2015. Os parâmetros genéticos foram estimados com uma função logit link utilizando o software ASReml, ajustando um modelo animal de repetibilidade, com o ano de nascimento, o ano de parto ea idade de caçoar como efeitos fixos e efeitos ambientais diretos e genéticos diretos como efeitos aleatórios. As tendências genéticas, fenotípicas e ambientais foram estimadas pela regressão do valor de criação, valor fenotípico e médias de desvio ambiental no ano de nascimento, respectivamente. Resultados: Herdabilidade baixa e negligenciável (0,002), repetibilidade (0,054) e coeficiente de ambiente permanente (0,052) foram estimadas para LS, o que indica baixa possibilidade de alcançar um progresso genético rápido através da seleção fenotípica. Foi estimada uma tendência genética não-significativa e realmente zero (0,00004 cabeças/parto/ano) e tendências fenotípicas e ambientais negativas significativas (-0,01097 e -0,01100 cabeças/parto/ano, respectivamente) no período estudado. Conclusão: Parece que a otimização das condições ambientais ea aplicação de tecnologias de alto rendimento em programas de seleção poderiam reduzir o risco de extinção para a raça Markhoz.Palavras-chave: heritabilidade, prolificidade, risco de extinção, seleção fenotípica, tendência genética.

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Section: Discussionsupporting

confidence: 83%

Genetic parameters and trends for litter size in Markhoz goats

Abdoli

Zamani

Mirhoseini

et al. 2019

Rev Colom Cienc Pecua

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“…The number of kids per calving from ILEG is higher than that of goats in Romania, with average kids per calving of 1.30 kids/doe (Pascal and Zaharia, 2016) and 1.43 kids/doe of Serrana goat (Margatho et al, 2019), 1.63 kids/doe of Begait goat (Abraham et al, 2018). It was almost the same as the average number of kids at German Improved Fawn goats with the kids per calving around1.70 kids/doe (Samardzija et al, 2013), and the ordinary calving of Saanen goats were 1.74 kids/doe (Kasap et al, 2013).…”

Section: Results and Discussion Prolific Data Of Ileg Doesmentioning

confidence: 64%

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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“…Crepaldy et al (1999) also reported bigger litter size of 1.6 kids/doe of Alpine breed raised in Italy. However, Kasap et al (2012) obtained almost exact value for litter size of 1.46 kids/doe when investigating reproductive parameters of Alpine goats in Croatia. In primiparous does, prolificacy of 125% was lower than in mature does which is consistent with numerous statements that litter size is influenced by parity (Amoah and Gelaye, 1990;Awemu et al, 1999;Kasap et al, 2012).…”

Section: Resultsmentioning

confidence: 96%

Productive characteristics and body measurements of alpine goats raised under smallholder production systems in central Serbia

Maksimovic

Bauman²,

Petrovic

et al. 2015

BIOTEC ANIM HUSB

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The purpose of this study was to evaluate present level of productivity and determine linear body traits of Alpine goats raised in Serbia on smallholder farms. Data were collected from 22 smallholder farms located in Belgrade district, with total of 330 purebred Alpine does 2-9 years of age, 145 yearling does and 476 kids. Traits measured were: body weight of does, body weight of kids at birth, 30 days of age and at weaning (90-120 days), prolificacy of mature and yearling (primiparous) does, six linear body traits of does (wither height, body length, hearth girth, chest depth, chest width, pelvic width) and milk production (milk yield, milk fat and milk protein content). The analysis showed the average body weight of does to be 54.96 kg, while the average body weight of kids at birth, 30 days of age and weaning was 2.73 kg, 8.7 kg and 18.3 kg., respectively. Prolificacy was 144% in mature and 125% in yearling does. Measurements of linear body traits were: wither height 67.87 cm, body length 71.92 cm, hearth girth 81.79 cm, chest depth 32.93, chest width 21.49 cm and pelvic width 17.63 cm. Among dairy production traits, following results were obtained: lactation length 220.73 days, total milk yield 531.66 kg, milk fat content 3.33% and milk protein content 3.16%. It was concluded that the overall productivity of Alpine goats raised under smallholder production systems in Serbia is satisfying. Giving the fact that these animals are usually kept under poor conditions, many of these productive traits are very good.

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Estimation of genetic parameters and genetic trends for reproductive traits in Saanen goats

Cited by 10 publications

References 15 publications

Genetic parameters and trends for litter size in Markhoz goats

Genetic parameters and trends for litter size in Markhoz goats

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

Productive characteristics and body measurements of alpine goats raised under smallholder production systems in central Serbia

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