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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
03/04/1996 |
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Data da última atualização: |
02/06/2023 |
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Autoria: |
SAHANI, M. S.; BAPNA, D. L.; ARORA, A. L. |
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Título: |
Factors influencing different body weights in Karakul sheep under North West arido region. |
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Ano de publicação: |
1993 |
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Fonte/Imprenta: |
Livestock Adviser, v. 18, n. 3, p. 6-11, 1993. |
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Idioma: |
Inglês |
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Conteúdo: |
Thalli is native sheep breed of Thall area of the Punjab, Pakistan. Data on 17030 birth records of 5421 Thalli sheepmaintained at Livestock Experiment Station, Rakh Ghulaman, district Bhakkar during 1975-2004 were utilized in thepresent study with the aim to evaluate the performance of Thalli sheep in Pakistan. The genetic parameter estimation wasperformed using REML procedure by fitting an Individual Animal Model. Birth weight with an average of 4.11±0.82 kg,was significantly affected by year, type of birth, sex and age of the dam but season of birth was an in significant effect onthe birth weight. Weight at 60 and 90-days of age averaged 11.58±3.57 and 14.92±4.56 kg, respectively. These weightswere affected by year and season of birth, birth weight. Type of birth and sex had significant effect on weight at 60 daysof age where as age of the dam had non-significant effect on weight at 60 days of age. Age of the dam significantlyaffected 90-day weight. Sex and type of birth had non-significant effect on 90 days weight. The weaning weight was18.95±4.12 kg and was affected by year and season of birth, sex of lamb. No significant effects of type of birth, birthweight and age of dam on weaning weight were observed. The direct heritability estimate of birth weight was0.067±0.01. The heritability estimates for 60- and 90-day weight were 0.116±0.01 and 0.18±0.01, respectively. Theheritability estimate for weaning weight was 0.03±0.11. Genetic correlation between birth weight and weaning weightwas negatively low with an estimate of 0.045±0.003. The low estimates of heritability for various performance traitsindicated the presence of less additive genetic variance and large environmental variances. Hence improvement in thetraits through selection may be limited MenosThalli is native sheep breed of Thall area of the Punjab, Pakistan. Data on 17030 birth records of 5421 Thalli sheepmaintained at Livestock Experiment Station, Rakh Ghulaman, district Bhakkar during 1975-2004 were utilized in thepresent study with the aim to evaluate the performance of Thalli sheep in Pakistan. The genetic parameter estimation wasperformed using REML procedure by fitting an Individual Animal Model. Birth weight with an average of 4.11±0.82 kg,was significantly affected by year, type of birth, sex and age of the dam but season of birth was an in significant effect onthe birth weight. Weight at 60 and 90-days of age averaged 11.58±3.57 and 14.92±4.56 kg, respectively. These weightswere affected by year and season of birth, birth weight. Type of birth and sex had significant effect on weight at 60 daysof age where as age of the dam had non-significant effect on weight at 60 days of age. Age of the dam significantlyaffected 90-day weight. Sex and type of birth had non-significant effect on 90 days weight. The weaning weight was18.95±4.12 kg and was affected by year and season of birth, sex of lamb. No significant effects of type of birth, birthweight and age of dam on weaning weight were observed. The direct heritability estimate of birth weight was0.067±0.01. The heritability estimates for 60- and 90-day weight were 0.116±0.01 and 0.18±0.01, respectively. Theheritability estimate for weaning weight was 0.03±0.11. Genetic correlation between birth weight and wea... Mostrar Tudo |
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Palavras-Chave: |
Genetic factors; Peso corporal; Pre-weaning; Thalli. |
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Thesagro: |
Melhoramento; Ovino; Raça. |
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Thesaurus Nal: |
Body weight; Breeding and Genetic Improvement; Karakul; Pakistan; Sheep. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
14/12/2016 |
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Data da última atualização: |
30/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 3 |
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Autoria: |
PEIXOTO, M. G. C. D.; BRUNELI, F. A. T.; BERGMANN, J. A. G.; SANTOS, G. G. dos; CARVALHO, M. R. S.; BRITO, L. F.; PEREIRA, M. C.; PIRES, M. de F. A. |
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Afiliação: |
MARIA GABRIELA CAMPOLINA D PEIXOTO, CNPGL; FRANK ANGELO TOMITA BRUNELI, CNPGL; J. A. G. Bergmann, UFMG; GLAUCYANA GOUVEA DOS SANTOS, CNPGL; M. R. S. Carvalho, UFMG; L F Brito, University of Guelph, Canada; M. C. Pereira, UFSC; MARIA DE FATIMA AVILA PIRES, CNPGL. |
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Título: |
Environmental and genetic effects on the temperament variability of Guzerá (Bos indicus) females. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
Livestock Research for Rural Development, v. 28, n. 159, article 9, 2016. |
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Idioma: |
Inglês |
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Conteúdo: |
The temperament of Guzerá females was evaluated to identify genetic and non-genetic factors influencing the expression of this trait, providing information to support decision-making in breeding programs. Temperament assessed by reactivity was evaluated in a livestock scale using visual scoring (TS) and an electronic device (TR). Measurements were repeated during the rainy and dry seasons in 1354 females from five herds comprising 2663 records. Estimates of (co)variance components and genetic parameters were obtained using the derivative-free restricted maximum likelihood method. The reactivity of Guzerá females widely varied. There is indication that the bulls used in these herds have been chosen based also on their daughters? temperament. The effects of herd, season, physiological state, weight class, entry order class, and age at time of measurement were significant (p< 0.001) sources of variation in TR. Herd was the most important factor associated with the reactivity and particularly handling practices are likely to explain the differences. The heritabilities of TS and TR were estimated as, 0.29 ± 0.08 and 0.06 ± 0.02, respectively. The genetic correlations were 0.89 between TS and TR and -0.46 between TR and test-day milk production. This study suggested that variation in TR is mainly influenced by non-genetic effects. Genetic parameter estimates still do not allow for an accurate establishment of the potential of TR for selection. Further studies using larger datasets should be performed to provide additional evaluation of female temperament. MenosThe temperament of Guzerá females was evaluated to identify genetic and non-genetic factors influencing the expression of this trait, providing information to support decision-making in breeding programs. Temperament assessed by reactivity was evaluated in a livestock scale using visual scoring (TS) and an electronic device (TR). Measurements were repeated during the rainy and dry seasons in 1354 females from five herds comprising 2663 records. Estimates of (co)variance components and genetic parameters were obtained using the derivative-free restricted maximum likelihood method. The reactivity of Guzerá females widely varied. There is indication that the bulls used in these herds have been chosen based also on their daughters? temperament. The effects of herd, season, physiological state, weight class, entry order class, and age at time of measurement were significant (p< 0.001) sources of variation in TR. Herd was the most important factor associated with the reactivity and particularly handling practices are likely to explain the differences. The heritabilities of TS and TR were estimated as, 0.29 ± 0.08 and 0.06 ± 0.02, respectively. The genetic correlations were 0.89 between TS and TR and -0.46 between TR and test-day milk production. This study suggested that variation in TR is mainly influenced by non-genetic effects. Genetic parameter estimates still do not allow for an accurate establishment of the potential of TR for selection. Further studies using larger datasets... Mostrar Tudo |
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Palavras-Chave: |
Animal behaviour; Reactivity. |
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Thesaurus NAL: |
animal handling; dairy cattle; zebu. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1058682/1/Cnpgl2016LivResRurDevEnvironmental.pdf
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Registro original: |
Embrapa Gado de Leite (CNPGL) |
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