Genetic and phenotypic parameters for some reproduction and milk production characters of the Damascus goat

Constantinou, A.; Beuing, R.; Mavrogenis, A. P.

doi:10.1111/j.1439-0388.1985.tb00699.x

Cited by 9 publications

(7 citation statements)

References 12 publications

(18 reference statements)

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“…Estimates of moderate repeatability suggest that successful selection for that trait is possible. Our estimates of repeatability were lower than those reported by other researchers (Montaldo et al, 1982;Constantinou et al, 1985;Ilahi et al, 1998;Bagnika and Lukaszewics, 1999 Valencia (1992) reported lower repeatability estimates for TMY and LL (0.12 and 0.00) in Mexican goats than the current investigation.…”

Section: Genetic Parameter Estimates For Lifetime Lactation Traitscontrasting

confidence: 81%

Devising a Selection Strategy for the Jamunapari Goat for Improving Lactation Performance

Dige¹,

Rout²,

Bhusan³

et al. 2021

Preprint

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This study aims to evaluate the genetic potential of the Jamunapari goat and formulate a new selection strategy for improving the lactation traits. The data set included 4049 phenotypic records for lifetime milk yield at 90 days (MY90) and 140 days (MY140), total milk yield (TMY), and lactation length (LL) obtained from the progeny of 83 sires and 1643 dams between 1990 and 2019. Animal model employing average information restricted maximum likelihood (AIREML) was used to estimate genetic parameters for milk yield traits and LL. The direct additive heritability estimates for lifetime lactation traits, that used repeatability model were 0.10 ± 0.03, 0.08 ± 0.03 and 0.12 ± 0.02 for MY90, MY140 and TMY, respectively, while it was low for LL (0.06 ± 0.02). The repeatability estimates were moderate ranging from 0.17 to 0.22 for milk yield traits and LL, indicating persistent performance over the parities. Animal permanent environment influence (c2) was significant in milk yield attributes, whereas additive maternal genetic effects were absent. As the early selection criteria based on first parity records is essential, we analysed the data for the first parity separately and obtained moderate h2 estimates viz. 0.26 ± 0.05, 0.26 ± 0.06 and 0.25 ± 0.06 for MY90, MY140 and TMY, respectively. These estimates augurs further positive scope of selection in Jamunapari goats for higher milk yield. High and positive genetic correlation of MY90 with MY140 (0.97 ± 0.01) and TMY (0.91 ± 0.05) revealed the scope of using MY90 as the selection criterion.Based on these results, we recommend use of MY90 as a single trait selection criterion for genetic improvement of all lactation traits in Jamunapari goat.

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Section: Genetic Parameter Estimates For Lifetime Lactation Traitscontrasting

confidence: 81%

Devising a Selection Strategy for the Jamunapari Goat for Improving Lactation Performance

Dige¹,

Rout²,

Bhusan³

et al. 2021

Preprint

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“…A literatura cita valores de herdabilidade para a produção de leite entre 0,16 e 0,72 (RONNINGEN, 1965(RONNINGEN, e 1967STEINE, 1976;BOUILLON e RICORDEAU, 1976;ILOEJE et al, 1981;KENNEDY et al, 1982;SULLIVAN et al, 1986;SINGH et al, 1970;PRAKASH et al, 1971;MAVROGENIS et al, 1984;CONSTANTINOU et al, 1985).…”

Section: Herdabilidadeunclassified

“…A estimativa de herdabilidade da produção de leite total, 0,296 ± 0,079 (Tabela 1), assemelhou-se mais às encontradas em raças nativas em regiões tropicais, cujos valores estão entre 0,15 e 0,35, com média de 0,28 (SINGH et al, 1970;PRAKASH et al, 1971;CONSTANTINOU et al, 1985;MAVROGENIS et al, 1984), que as obtidas em raças especializadas em países de clima temperado, cujos valores estão entre 0,28 e 0,72 e média de 0,47 (RONNINGEN, 1965;RONNINGEN, 1967;STEINE, 1976;ILOEJE et al, 1981;KENNEDY et al, 1982;SULLIVAN et al, 1986;BOICHARD et al, 1989).…”

Section: Herdabilidadeunclassified

Fatores genéticos e de meio na produção de leite de caprinos leiteiros

et al. 2001

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RESUMO -Objetivou-se, no presente estudo, avaliar a produção de leite de caprinos leiteiros da região sudeste do Brasil, com intuito de verificar os fatores de meio e estimar os parâmetros genéticos pelo método dos mínimos quadrados (MMQ). Os controles de 1336 lactações foram inicialmente ajustados pela função multifásica (difásica) e calculou-se a produção de leite total (PLT). Os dados foram provenientes de sete propriedades e três raças (Parda Alpina, Saanen e Toggenburg). A média e o erro-padrão da PLT estimados pelo MMQ foram de 635,31 ±39,75 kg. A interação ano x estação do parto influenciou a PLT. Em um dos anos estudados, a PLT foi menor para as cabras paridas no final da estação. Nas três estações de parto, observou-se comportamento quadrático da PLT, em função dos anos de parto. Para as três estações, a PLT aumentou de 1986 até meados de 1990, decrescendo em seguida. A idade de máxima PLT foi observada aos 46,65 meses. Das três raças estudadas, observou-se que as raças Parda Alpina e Saanen apresentaram alternância de superioridade na PLT em algumas fazendas, porém maiores que a Toggenburg. Os coeficientes de herdabilidade e repetibilidade da PLT estimados pelo MMQ foram de 0,296 ± 0,079 e 0,277 ± 0,033, respectivamente. Estes resultados revelam baixa confiabilidade em poucas observações dessas características ou na inconsistência das estimativas da função multifásica. Como a PLT é uma característica limitada ao sexo, sugere-se o teste de progênie como método de seleção mais eficiente para os reprodutores e uso de inseminação artificial como processo de disseminação do material genético selecionado.Palavras-chave: caprinos, herdabilidade, produção de leite, repetibilidade Genetic and Environmental Factors Affecting Milk Production from Dairy GoatsABSTRACT -The objectives of this study were to evaluate the influence of environmental factors on milk production from dairy goats raised in the Brazilian Southeast and to estimate genetic parameters for this trait through least squares. The data originated from seven farms and three breeds (Alpine Brown, Saanen and Toggenburg). Milk yields obtained from 1,336 lactations were initially fitted to a diphasic function, whereby total milk production (TMP) was estimated. The overall mean and standard error for TMP were 635.31±39.75 kg. A significant year x kidding season interaction was observed. In all three kidding seasons a quadratic yearly trend of PLT was observed: it increased from 1986 until mid-1990, decreasing thereafter. Age of maximum PLT was estimated as 46.65 months. Alpine Brown was superior to Saanen in some farms, the opposite occurring in others, but both showed higher PLT values than Toggenburg. Estimated heritability and repeatability coefficients were 0.296±0.079 and 0.227±0.033, respectively. These results show low reliability due to the small number of observations or to inconsistent PLT estimates obtained through the biphasic function. Since PLT is a sex-limited trait, it is suggested the use of progeny tests as the most efficient selection m...

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“…The number or traits analysed varied according to the study. Studies from Cyprus (Mavrogenis et al, 1984;Constantinou et al, 1985) were restricted to the analysis of milk yield (90-day, 150-day or total). Studies from Norway or North America dealt with milk and fat traits.…”

Section: Environmental Effectsmentioning

confidence: 99%

Genetic parameters for first lactation dairy traits in the Alpine and Saanen goat breeds

Boichard¹,

Bouloc²,

Ricordeau³

et al. 1989

Genet Sel Evol

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Summary — Genetic parameters for dairy traits in first lactation (milk yield, fat and protein yields, fat and protein contents) were estimated by restricted maximum likelihood in the Alpine and Saanen goat breeds from records including progeny of 473 and 238 unproven bucks respectively, mainly used in natural mating. The differences between breeds could also be estimated when the flocks used both breeds. The sampling of the data sets, the addition of data from 28 and 22 progenies of Al proven sires, and the relationship matrix between sampling sires contributed to increase the connection level between flocks, which, however, remained rather low. In the same environmental conditions, particularly in the same year-flock, the Saanen breed appeared more high-yielding than the Alpine, but solid content was lower. Within-breed, the genetic standard deviation was 1.8-2 fold larger for fat content than for protein content. The heritability of fat and protein yields was rather high (0.31 to 0.39). The genetic correlations between yields were larger than 0.8. They were generally negative but rather low (-0.30 (0,3i -0,39

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Genetic and phenotypic parameters for some reproduction and milk production characters of the Damascus goat

Cited by 9 publications

References 12 publications

Devising a Selection Strategy for the Jamunapari Goat for Improving Lactation Performance

Devising a Selection Strategy for the Jamunapari Goat for Improving Lactation Performance

Fatores genéticos e de meio na produção de leite de caprinos leiteiros

Genetic parameters for first lactation dairy traits in the Alpine and Saanen goat breeds

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