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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
21/12/2021 |
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Data da última atualização: |
21/12/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
LIMA, C. M. M.; TOMAZELLA, V. L. D.; SOUSA JUNIOR, S. C. DE; CAMPELO, J. E. G.; SENA, L. S.; BARIONI JUNIOR, W. |
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Afiliação: |
CLEIDE MAYRA MENEZES LIMA, UFPI; VERA LUCIA DAMASCENO TOMAZELLA, UFSCAR; SEVERINO CAVALCANTE DE SOUSA JUNIOR, UFDPA; JOSÉ ELIVALTO GUIMARÃES CAMPELO, UFPI; LUCIANO SILVA SENA, UFPI; WALDOMIRO BARIONI JUNIOR, CPPSE. |
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Título: |
Cox-Gompertz model for analysis of the time of stay in an anglo-nubian goat herd. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Semina. Ciências Agrárias, v.42, n.5, p.2937-2958, 2021. |
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DOI: |
10.5433/1679-0359.2021v42n5p2937 |
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Idioma: |
Inglês |
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Conteúdo: |
Anglo-Nubian goats are hardy animals able to adapt to tropical environments, where their farming is usually held on pasture. However, climatic conditions in this environment also favor endoparasitism, which implies a negative aspect if sensitivity to worm infections interferes by reducing the reproductive lifespan of females, as their stay in the herd is a trait of great importance for efficient goat farming. In this respect, this study proposes to use the survival analysis methodology with the Cox-Gompertz proportional hazards model to assess the length of stay in the herd by relating the removal of females due to death with worm infection being the main cause to other forms of culling, using information from 101 Anglo-Nubian goats born from 2009 to 2013 in an experimental herd from Teresina - PI, Brazil. The Cox-Gompertz proportional hazards model chose body condition score, birth weight and birth season as important covariates (p-value ≤ 10%). Body condition score showed to be a favorable factor for the longer stay of the goats in the herd. Eggs per gram, age at first kidding, birth type and dam age were not significant. The Cox-Gompertz proportional hazards model is suitable for fitting the statistical model to estimate the length of stay in the herd, with censoring related to endoparasitism in Anglo-Nubian goats |
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Palavras-Chave: |
Body condition score; Censoring; Culling; EPG; Famacha. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/229420/1/CoxGompertzModel.pdf
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Marc: |
LEADER 02088naa a2200253 a 4500
001 2138135
005 2021-12-21
008 2021 bl uuuu u00u1 u #d
024 7 $a10.5433/1679-0359.2021v42n5p2937$2DOI
100 1 $aLIMA, C. M. M.
245 $aCox-Gompertz model for analysis of the time of stay in an anglo-nubian goat herd.$h[electronic resource]
260 $c2021
520 $aAnglo-Nubian goats are hardy animals able to adapt to tropical environments, where their farming is usually held on pasture. However, climatic conditions in this environment also favor endoparasitism, which implies a negative aspect if sensitivity to worm infections interferes by reducing the reproductive lifespan of females, as their stay in the herd is a trait of great importance for efficient goat farming. In this respect, this study proposes to use the survival analysis methodology with the Cox-Gompertz proportional hazards model to assess the length of stay in the herd by relating the removal of females due to death with worm infection being the main cause to other forms of culling, using information from 101 Anglo-Nubian goats born from 2009 to 2013 in an experimental herd from Teresina - PI, Brazil. The Cox-Gompertz proportional hazards model chose body condition score, birth weight and birth season as important covariates (p-value ≤ 10%). Body condition score showed to be a favorable factor for the longer stay of the goats in the herd. Eggs per gram, age at first kidding, birth type and dam age were not significant. The Cox-Gompertz proportional hazards model is suitable for fitting the statistical model to estimate the length of stay in the herd, with censoring related to endoparasitism in Anglo-Nubian goats
653 $aBody condition score
653 $aCensoring
653 $aCulling
653 $aEPG
653 $aFamacha
700 1 $aTOMAZELLA, V. L. D.
700 1 $aSOUSA JUNIOR, S. C. DE
700 1 $aCAMPELO, J. E. G.
700 1 $aSENA, L. S.
700 1 $aBARIONI JUNIOR, W.
773 $tSemina. Ciências Agrárias$gv.42, n.5, p.2937-2958, 2021.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Unidades Centrais. Para informações adicionais entre em contato com biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Unidades Centrais. |
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Data corrente: |
13/05/1998 |
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Data da última atualização: |
13/05/1998 |
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Autoria: |
HELWEG, O. J.; SHARMA, P. N. |
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Título: |
An approach to economic analysis of water resource systems under high rainfall uncertainty. |
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Ano de publicação: |
1985 |
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Fonte/Imprenta: |
Pesquisa Agropecuaria Brasileira, Brasilia, v.20, n.11, p.1301-1307, nov. 1985. |
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Idioma: |
Inglês |
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Conteúdo: |
Most water supply systems are sized somewhat arbitrarily by either designing them to yield a firm supply for the wost drought of record or some smaller amount which way be decided by available resources. The first size estimate for most systems should be that capacity which maximizes expected net benefits, thus incorporating probability into the economic analysis. This is especially true for regions of hight precipitation uncertainty. If, after that problem is solved, the client desires to choose another project size, the trade-offs are clearer. This paper will illustrate the principle by an example of sizing a small reservoir (tank) for the northeastern Brazilian semi-arid tropics (SAT). |
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Palavras-Chave: |
Optimization of water resources; Otimizacao de recursos hidricos. |
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Thesagro: |
Manejo de Água. |
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Thesaurus NAL: |
water management. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01282naa a2200181 a 4500
001 1104632
005 1998-05-13
008 1985 bl uuuu u00u1 u #d
100 1 $aHELWEG, O. J.
245 $aAn approach to economic analysis of water resource systems under high rainfall uncertainty.
260 $c1985
520 $aMost water supply systems are sized somewhat arbitrarily by either designing them to yield a firm supply for the wost drought of record or some smaller amount which way be decided by available resources. The first size estimate for most systems should be that capacity which maximizes expected net benefits, thus incorporating probability into the economic analysis. This is especially true for regions of hight precipitation uncertainty. If, after that problem is solved, the client desires to choose another project size, the trade-offs are clearer. This paper will illustrate the principle by an example of sizing a small reservoir (tank) for the northeastern Brazilian semi-arid tropics (SAT).
650 $awater management
650 $aManejo de Água
653 $aOptimization of water resources
653 $aOtimizacao de recursos hidricos
700 1 $aSHARMA, P. N.
773 $tPesquisa Agropecuaria Brasileira, Brasilia$gv.20, n.11, p.1301-1307, nov. 1985.
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