| |
|
|
|
Registro Completo |
|
Biblioteca(s): |
Embrapa Gado de Leite. |
|
Data corrente: |
12/12/2012 |
|
Data da última atualização: |
09/02/2024 |
|
Tipo da produção científica: |
Artigo em Periódico Indexado |
|
Autoria: |
PEREIRA, R. J.; VERNEQUE, R. da S.; LOPES, P. S.; SANTANA JUNIOR, M. L.; LAGROTTA, M. R.; TORRES, R. A.; VERCESI FILHO, A. E.; MACHADO, M. A. |
|
Afiliação: |
R. J. PEREIRA, UNESP; RUI DA SILVA VERNEQUE, CNPGL; P. S. LOPES, UFV; M. L. SANTANA JUNIOR, UFMT; M. R. LAGROTTA, UFV; R. A. TORRES, UFV; A. E. VERCESI FILHO, APTA; MARCO ANTONIO MACHADO, CNPGL. |
|
Título: |
Milk yield persistency in brazilian gyr cattle based on a random regression model. |
|
Ano de publicação: |
2012 |
|
Fonte/Imprenta: |
Genetics and Molecular Research, v. 11, n. 2., p. 1599-1609, 2012. |
|
DOI: |
https://doi.org/10.4238/2012.june.15.9 |
|
Idioma: |
Inglês |
|
Conteúdo: |
With the objective of evaluating measures of milk yield persistency, 27,000 test-day milk yield records from 3362 first lactations of Brazilian Gyr cows that calved between 1990 and 2007 were analyzed with a random regression model. Random, additive genetic and permanent environmental effects were modeled using Legendre polynomials of order 4 and 5, respectively. Residual variance was modeled using five classes. The average lactation curve was modeled using a fourth-order Legendre polynomial. Heritability estimates for measures of persistency ranged from 0.10 to 0.25. Genetic correlations between measures of persistency and 305-day milk yield (Y305) ranged from -0.52 to 0.03. At high selection intensities for persistency measures and Y305, few animals were selected in common. As the selection intensity for the two traits decreased, a higher percentage of animals were selected in common. The average predicted breeding values for Y305 according to year of birth of the cows had a substantial annual genetic gain. In contrast, no improvement in the average persistency breeding value was observed. We conclude that selection for total milk yield during lactation does not identify bulls or cows that are genetically superior in terms of milk yield persistency. A measure of persistency represented by the sum of deviations of estimated breeding value for days 31 to 280 in relation to estimated breeding value for day 30 should be preferred in genetic evaluations of this trait in the Gyr breed, since this measure showed a medium heritability and a genetic correlation with 305-day milk yield close to zero. In addition, this measure is more adequate at the time of peak lactation, which occurs between days 25 and 30 after calving in this breed. MenosWith the objective of evaluating measures of milk yield persistency, 27,000 test-day milk yield records from 3362 first lactations of Brazilian Gyr cows that calved between 1990 and 2007 were analyzed with a random regression model. Random, additive genetic and permanent environmental effects were modeled using Legendre polynomials of order 4 and 5, respectively. Residual variance was modeled using five classes. The average lactation curve was modeled using a fourth-order Legendre polynomial. Heritability estimates for measures of persistency ranged from 0.10 to 0.25. Genetic correlations between measures of persistency and 305-day milk yield (Y305) ranged from -0.52 to 0.03. At high selection intensities for persistency measures and Y305, few animals were selected in common. As the selection intensity for the two traits decreased, a higher percentage of animals were selected in common. The average predicted breeding values for Y305 according to year of birth of the cows had a substantial annual genetic gain. In contrast, no improvement in the average persistency breeding value was observed. We conclude that selection for total milk yield during lactation does not identify bulls or cows that are genetically superior in terms of milk yield persistency. A measure of persistency represented by the sum of deviations of estimated breeding value for days 31 to 280 in relation to estimated breeding value for day 30 should be preferred in genetic evaluations of this trait in the Gyr... Mostrar Tudo |
|
Palavras-Chave: |
Função de covariância; Parametros genéticos; Produção de leite. |
|
Thesagro: |
Gado Leiteiro. |
|
Categoria do assunto: |
G Melhoramento Genético |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/942286/1/Milk-yield-persistency-in-brazilian-gyr-cattle-based-on-a-random-regression-model.pdf
|
|
Marc: |
LEADER 02591naa a2200265 a 4500
001 1942286
005 2024-02-09
008 2012 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.4238/2012.june.15.9$2DOI
100 1 $aPEREIRA, R. J.
245 $aMilk yield persistency in brazilian gyr cattle based on a random regression model.$h[electronic resource]
260 $c2012
520 $aWith the objective of evaluating measures of milk yield persistency, 27,000 test-day milk yield records from 3362 first lactations of Brazilian Gyr cows that calved between 1990 and 2007 were analyzed with a random regression model. Random, additive genetic and permanent environmental effects were modeled using Legendre polynomials of order 4 and 5, respectively. Residual variance was modeled using five classes. The average lactation curve was modeled using a fourth-order Legendre polynomial. Heritability estimates for measures of persistency ranged from 0.10 to 0.25. Genetic correlations between measures of persistency and 305-day milk yield (Y305) ranged from -0.52 to 0.03. At high selection intensities for persistency measures and Y305, few animals were selected in common. As the selection intensity for the two traits decreased, a higher percentage of animals were selected in common. The average predicted breeding values for Y305 according to year of birth of the cows had a substantial annual genetic gain. In contrast, no improvement in the average persistency breeding value was observed. We conclude that selection for total milk yield during lactation does not identify bulls or cows that are genetically superior in terms of milk yield persistency. A measure of persistency represented by the sum of deviations of estimated breeding value for days 31 to 280 in relation to estimated breeding value for day 30 should be preferred in genetic evaluations of this trait in the Gyr breed, since this measure showed a medium heritability and a genetic correlation with 305-day milk yield close to zero. In addition, this measure is more adequate at the time of peak lactation, which occurs between days 25 and 30 after calving in this breed.
650 $aGado Leiteiro
653 $aFunção de covariância
653 $aParametros genéticos
653 $aProdução de leite
700 1 $aVERNEQUE, R. da S.
700 1 $aLOPES, P. S.
700 1 $aSANTANA JUNIOR, M. L.
700 1 $aLAGROTTA, M. R.
700 1 $aTORRES, R. A.
700 1 $aVERCESI FILHO, A. E.
700 1 $aMACHADO, M. A.
773 $tGenetics and Molecular Research$gv. 11, n. 2., p. 1599-1609, 2012.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Leite (CNPGL) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
|
Registro Completo
|
Biblioteca(s): |
Embrapa Gado de Leite. |
|
Data corrente: |
20/04/2015 |
|
Data da última atualização: |
12/08/2022 |
|
Tipo da produção científica: |
Nota Técnica/Nota Científica |
|
Autoria: |
PALHÃO, M. P.; PEREIRA, A.; FERNANDES, C. A. de C.; ROSSI, J.; VIANA, J. H. M.; GIOSO, M. M.; GARCIA, J. A. D.; ALVES, B. F. L.; OLIVEIRA, E. R. |
|
Afiliação: |
MILLER PEREIRA PALHÃO, UNIFENAS; A. PEREIRA, UNIFENAS; CARLOS ANTONIO DE CARVALHO FERNANDES, UNIFENAS; J. ROSSI, UNIFENAS; JOAO HENRIQUE MOREIRA VIANA, CNPGL; M. M. GIOSO, UNIFENAS; JOSÉ ANTONIO D. GARCIA, UNIFENAS; B. F. L. ALVES; EDUARDO RAMOS DE OLIVEIRA, BIOTRAN. |
|
Título: |
Florfenicol associado ou não ao cloprostenol no tratamento de retenção de placenta em vacas leiteiras. |
|
Ano de publicação: |
2014 |
|
Fonte/Imprenta: |
Arquivo Brasileiro de Medicina Veterinária e Zootecnia, v. 66, n. 1, p. 305-309, 2014. |
|
DOI: |
https://doi.org/10.1590/S0102-09352014000100041 |
|
Idioma: |
Português |
|
Conteúdo: |
The aim of this study was to compare the reproductive efficiency in dairy cows with retained placenta (RP), treated with Florfenicol associated or not with Cloprostenol. One hundred and eight cows with RP from dairy herds in southern Minas Gerais state and northern São Paulo state, were included for this purpose. The experiment was designed in factorial 2X2 . The four treatments encompassed two levels of each factor : 1 ) Florfenicol - 4 0mg/kg ( IM) divided in two injections or 40mg / kg ( SC) in one injection after calving; 2) Cloprostenol (0.530mg) - two injections associated with florfenicol treatment or without cloprostenol. The analysis of discrete variables used the Kruskal - Wallis (fou r groups) or Wilcoxon (two groups) statistic to compare groups. The Student "T" test was used to compare means of continuous variables. The overall occurrence of RP was 20.7%. The florfenicol groups had no effects on postpartum uterine health or subsequent reproductive efficiency of the cows. The cloprostenol injections of RP hastened the uterine involution and decreased the occurrence of uterine infection, and increased the percentage of animals with corpus luteum between 25 and 40 days after parturition. The intervals from parturition to first artificial insemination (AI) and to conception, as well as the number of AI per conception were reduced in the cloprostenol treatment. |
|
Palavras-Chave: |
Infecção uterina; Involução uterina; Período pós-parto. |
|
Thesagro: |
Eficiência Reprodutiva. |
|
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
|
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/122509/1/Cnpgl-2014-ArqBrasMedVetZ-Florfenicol.pdf
|
|
Marc: |
LEADER 02298naa a2200277 a 4500
001 2013809
005 2022-08-12
008 2014 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1590/S0102-09352014000100041$2DOI
100 1 $aPALHÃO, M. P.
245 $aFlorfenicol associado ou não ao cloprostenol no tratamento de retenção de placenta em vacas leiteiras.$h[electronic resource]
260 $c2014
520 $aThe aim of this study was to compare the reproductive efficiency in dairy cows with retained placenta (RP), treated with Florfenicol associated or not with Cloprostenol. One hundred and eight cows with RP from dairy herds in southern Minas Gerais state and northern São Paulo state, were included for this purpose. The experiment was designed in factorial 2X2 . The four treatments encompassed two levels of each factor : 1 ) Florfenicol - 4 0mg/kg ( IM) divided in two injections or 40mg / kg ( SC) in one injection after calving; 2) Cloprostenol (0.530mg) - two injections associated with florfenicol treatment or without cloprostenol. The analysis of discrete variables used the Kruskal - Wallis (fou r groups) or Wilcoxon (two groups) statistic to compare groups. The Student "T" test was used to compare means of continuous variables. The overall occurrence of RP was 20.7%. The florfenicol groups had no effects on postpartum uterine health or subsequent reproductive efficiency of the cows. The cloprostenol injections of RP hastened the uterine involution and decreased the occurrence of uterine infection, and increased the percentage of animals with corpus luteum between 25 and 40 days after parturition. The intervals from parturition to first artificial insemination (AI) and to conception, as well as the number of AI per conception were reduced in the cloprostenol treatment.
650 $aEficiência Reprodutiva
653 $aInfecção uterina
653 $aInvolução uterina
653 $aPeríodo pós-parto
700 1 $aPEREIRA, A.
700 1 $aFERNANDES, C. A. de C.
700 1 $aROSSI, J.
700 1 $aVIANA, J. H. M.
700 1 $aGIOSO, M. M.
700 1 $aGARCIA, J. A. D.
700 1 $aALVES, B. F. L.
700 1 $aOLIVEIRA, E. R.
773 $tArquivo Brasileiro de Medicina Veterinária e Zootecnia$gv. 66, n. 1, p. 305-309, 2014.
Download
Esconder MarcMostrar Marc Completo |
|
Registro original: |
Embrapa Gado de Leite (CNPGL) |
|
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
| Expressão de busca inválida. Verifique!!! |
|
|
