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 | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
04/10/2023 |
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Data da última atualização: |
15/02/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
MULLER, M. D.; BORGES, C. A. V.; RESENDE, L. de O.; MARTINS, C. E. |
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Afiliação: |
MARCELO DIAS MULLER, CNPGL; CRISTIANO AMANCIO VIEIRA BORGES, CNPGL; LEONARDO DE OLIVEIRA RESENDE, ESCAS-ESCOLA SUPERIOR DE CONSERVAÇÃO AMBIENTAL E SUSTENTABILIDADE; CARLOS EUGENIO MARTINS, CNPGL. |
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Título: |
Estimating volume of eucalyptus trees for small-scale silvopastoral systems: do we really need height for accurate estimates? |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
European Journal of Forest Research, v. 143, p. 81-94, 2024. |
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DOI: |
https://doi.org/10.1007/s10342-023-01608-2 |
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Idioma: |
Inglês |
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Conteúdo: |
Double-entry volume equations require measurement of diameter and height variables, making forest inventory more expensive. This can be limiting for small farms. Then the single-entry volume equations, where diameter at breast height (DBH) is the independent variable, are a cost-efective option for these landowners because they optimize data collection due to the use of one readily available variable (the DBH) and require few resources. The objective of this study was to evaluate the efective contribution of the height in the estimation of eucalypt trees volume for small-scale silvopastoral systems. For this, four single-entry and fve double-entry volumetric models were ftted to the data for six diferent silvopastoral systems in Coronel Pacheco, Minas Gerais State, Brazil. The six strata consisted of combinations of three diferent Eucalyptus genetic material and three silvopastoral systems, and the models were compared aiming the selection of the best of each type in each system. Double-entry models, specifcally logarithmic Spurr and logarithmic Schumacher?Hall, ftted better than single-entry ones for all but one of the strata, where they were overcome by the Husch?s model. Although the superiority of the formers can have been easily verifed by diferent and complementary statistics, we found that the volume estimates provided by the best double-entry and the best single-entry model of each stratum difered by a quantity that can be considered irrisory, from both practical and monetary points of view. On a per tree basis, the sum of the diferences for each stratum, in absolute value, did not surpass 0.051 m3 , or only US$ 0.25, considering a market value of US$ 4.90/m3 . And when simulating a real scenario of batch sales for each stratum, by simple extrapolation of the mean volume and considering their efective tree stand, such diferences did not exceed±0.25 m3 /ha, or±US$ 1.20/ha. Following the same logic, even when comparing the best doubleentry model to the worst single-entry one for each stratum, we still observed only negligible diferences. Considering the sampled trees, these diferences amounted to a balance per stratum of only?0.015 to+0.032 m3 (or between?US$ 0.07 and+US$ 0.16). When extrapolated to the total trees in each stratum, the overall balance did not exceed an absolute value of 0.283 m3 (or US$1.39). These results suggest that the contribution of height may be negligible in estimating the volume of eucalyptus trees for small silvopastoral systems. Consequently, smallholders may not beneft from measuring tree heights. Rather, they may save money by foregoing a comprehensive forest inventory and instead using single-entry models, such as the Husch model, to estimate the wood volume of their forest stands. Another highlight or reinforcement of this work is that the use of the Furnival index was crucial for a reliable selection of the best models, once it allows for comparisons among models both with and without a log transformation of the volume. MenosDouble-entry volume equations require measurement of diameter and height variables, making forest inventory more expensive. This can be limiting for small farms. Then the single-entry volume equations, where diameter at breast height (DBH) is the independent variable, are a cost-efective option for these landowners because they optimize data collection due to the use of one readily available variable (the DBH) and require few resources. The objective of this study was to evaluate the efective contribution of the height in the estimation of eucalypt trees volume for small-scale silvopastoral systems. For this, four single-entry and fve double-entry volumetric models were ftted to the data for six diferent silvopastoral systems in Coronel Pacheco, Minas Gerais State, Brazil. The six strata consisted of combinations of three diferent Eucalyptus genetic material and three silvopastoral systems, and the models were compared aiming the selection of the best of each type in each system. Double-entry models, specifcally logarithmic Spurr and logarithmic Schumacher?Hall, ftted better than single-entry ones for all but one of the strata, where they were overcome by the Husch?s model. Although the superiority of the formers can have been easily verifed by diferent and complementary statistics, we found that the volume estimates provided by the best double-entry and the best single-entry model of each stratum difered by a quantity that can be considered irrisory, from both practical and... Mostrar Tudo |
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Palavras-Chave: |
Agrosilvopastoral systems; Crop-livestock-forestry systems; Sistema agrossilvipastoril; Sustainable farming systems. |
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Thesagro: |
Sistema de Cultivo. |
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Categoria do assunto: |
A Sistemas de Cultivo |
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Marc: |
LEADER 03820naa a2200229 a 4500
001 2157074
005 2024-02-15
008 2024 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s10342-023-01608-2$2DOI
100 1 $aMULLER, M. D.
245 $aEstimating volume of eucalyptus trees for small-scale silvopastoral systems$bdo we really need height for accurate estimates?$h[electronic resource]
260 $c2024
520 $aDouble-entry volume equations require measurement of diameter and height variables, making forest inventory more expensive. This can be limiting for small farms. Then the single-entry volume equations, where diameter at breast height (DBH) is the independent variable, are a cost-efective option for these landowners because they optimize data collection due to the use of one readily available variable (the DBH) and require few resources. The objective of this study was to evaluate the efective contribution of the height in the estimation of eucalypt trees volume for small-scale silvopastoral systems. For this, four single-entry and fve double-entry volumetric models were ftted to the data for six diferent silvopastoral systems in Coronel Pacheco, Minas Gerais State, Brazil. The six strata consisted of combinations of three diferent Eucalyptus genetic material and three silvopastoral systems, and the models were compared aiming the selection of the best of each type in each system. Double-entry models, specifcally logarithmic Spurr and logarithmic Schumacher?Hall, ftted better than single-entry ones for all but one of the strata, where they were overcome by the Husch?s model. Although the superiority of the formers can have been easily verifed by diferent and complementary statistics, we found that the volume estimates provided by the best double-entry and the best single-entry model of each stratum difered by a quantity that can be considered irrisory, from both practical and monetary points of view. On a per tree basis, the sum of the diferences for each stratum, in absolute value, did not surpass 0.051 m3 , or only US$ 0.25, considering a market value of US$ 4.90/m3 . And when simulating a real scenario of batch sales for each stratum, by simple extrapolation of the mean volume and considering their efective tree stand, such diferences did not exceed±0.25 m3 /ha, or±US$ 1.20/ha. Following the same logic, even when comparing the best doubleentry model to the worst single-entry one for each stratum, we still observed only negligible diferences. Considering the sampled trees, these diferences amounted to a balance per stratum of only?0.015 to+0.032 m3 (or between?US$ 0.07 and+US$ 0.16). When extrapolated to the total trees in each stratum, the overall balance did not exceed an absolute value of 0.283 m3 (or US$1.39). These results suggest that the contribution of height may be negligible in estimating the volume of eucalyptus trees for small silvopastoral systems. Consequently, smallholders may not beneft from measuring tree heights. Rather, they may save money by foregoing a comprehensive forest inventory and instead using single-entry models, such as the Husch model, to estimate the wood volume of their forest stands. Another highlight or reinforcement of this work is that the use of the Furnival index was crucial for a reliable selection of the best models, once it allows for comparisons among models both with and without a log transformation of the volume.
650 $aSistema de Cultivo
653 $aAgrosilvopastoral systems
653 $aCrop-livestock-forestry systems
653 $aSistema agrossilvipastoril
653 $aSustainable farming systems
700 1 $aBORGES, C. A. V.
700 1 $aRESENDE, L. de O.
700 1 $aMARTINS, C. E.
773 $tEuropean Journal of Forest Research$gv. 143, p. 81-94, 2024.
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Embrapa Gado de Leite (CNPGL) |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
08/01/2014 |
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Data da última atualização: |
10/01/2014 |
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Autoria: |
SOUSA, R. T. de; BOMFIM, M. A. D.; FONSECA, J. F. da; FACO, O.; FONTELES, N. L. de O.; GONÇALVES, J. de L. |
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Afiliação: |
Rafael Teixeira de Sousa, Pós-graduação - Universidade de São Paulo (USP); MARCO AURELIO DELMONDES BOMFIM, CNPC; JEFERSON FERREIRA DA FONSECA, CNPC; OLIVARDO FACO, CNPC; Natália Lívia de Oliveira Fonteles, Pós-graduação - USP; Juliete de Lima Gonçalves, Pós-graduação - Universidade Estadual Vale do Acaraú (UVA) - Sobral, CE, Brasil. |
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Título: |
Desempenho produtivo de ovelhas deslanadas submetidas ao flushing de ácidos graxos. |
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Ano de publicação: |
2013 |
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Fonte/Imprenta: |
In: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 8., 2013, Fortaleza. [Anais...]. [Sobral: Universidade Estadual Vale do Acaraú; Embrapa Caprinos e Ovinos, 2013]. 4 f. |
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Idioma: |
Português |
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Conteúdo: |
Resumo: Os mecanismos da atuação dos lipídeos sobre o desempenho produtivo e reprodutivo de pequenos ruminantes são bastante amplos. Em razão disso, no presente estudo, investigou-se o desempenho produtivo de ovelhas deslanadas submetidas ao flushing de ácidos graxos. Aos 21 dias antes da estação de monta as matrizes foram divididas em três grupos experimentais para o fornecimento do flushing, por um período de 42 dias. No terço final de gestação e durante o período de lactação as ovelhas foram suplementadas com concentrado na quantidade de 400g/cabeça/dia. A produtividade das ovelhas não diferiu significativamente em relação ao flushing (P>0,05) para o índice de peso total de cordeiro nascido por ovelha (PNT). A produtividade dos grupos genéticos não diferiu (P>0,05) para os índices: peso total de cordeiro por ovelha nas idades de 28 (PT28) e 56 (PT56). Para os índices: peso total de cordeiro nas idades de 84 (PT56) e 105 (PT105) dias, as ovelhas da raça Somalis Brasileira apresentaram maiores produtividades (P<0,05) quando comparadas às ovelhas da raça Morada Nova. O flushing de ácidos graxos não influenciou o peso dos cordeiros ao nascer, entretanto influenciou o peso total de cordeiro por ovelha parida nas idades de 28, 56, 84 e 105 dias (desmame). As ovelhas da raça Somalis Brasileira apresentaram maior produtividade de peso total de cordeiro por ovelha parida nas idades de 84 e 105 dias (Desmame). [Productive performance of ewes subjected to flushing of fatty acids]. Abstract: The mechanisms of action of lipids on the productive and reproductive performance of small ruminants are quite large. For this reason, in the present study, we investigated the productive performance of ewes subjected to flushing fatty acids. The flushing supplementation was offered from 21 days before the breeding season for 42 days.The ewes were divided in three groups receiving one of these treatments: control (no flushing) and two levels of lipids based flushing (high or low lipid content). In the last third of pregnancy and during lactation, the ewes were supplemented with 400g/head/day of concentrate. The productivity of the sheep did not differ significantly from flushing (P>0,05) for the index of total weight of lamb born per ewe (PNT). The productivity of the genetic groups did not differ (P>0,05) for the indices: total weight of lamb per ewe at ages 28 (PT28) and 56 (PT56). For indices: total weight of lamb at ages 84 (PT56) and 105 (PT105) days, the ewes Brazilian Somalis had higher yields (P<0,05) when compared to the Morada Nova sheep. The flushing of fatty acids did not affect the weight of lambs at birth, however influenced the total weight of lamb per ewe parity at ages 28, 56, 84 and 105 days (weaning). Ewes Brazilian Somalis had higher yields of total weight of lamb per ewe parity at ages 84 and 105 days (weaning). MenosResumo: Os mecanismos da atuação dos lipídeos sobre o desempenho produtivo e reprodutivo de pequenos ruminantes são bastante amplos. Em razão disso, no presente estudo, investigou-se o desempenho produtivo de ovelhas deslanadas submetidas ao flushing de ácidos graxos. Aos 21 dias antes da estação de monta as matrizes foram divididas em três grupos experimentais para o fornecimento do flushing, por um período de 42 dias. No terço final de gestação e durante o período de lactação as ovelhas foram suplementadas com concentrado na quantidade de 400g/cabeça/dia. A produtividade das ovelhas não diferiu significativamente em relação ao flushing (P>0,05) para o índice de peso total de cordeiro nascido por ovelha (PNT). A produtividade dos grupos genéticos não diferiu (P>0,05) para os índices: peso total de cordeiro por ovelha nas idades de 28 (PT28) e 56 (PT56). Para os índices: peso total de cordeiro nas idades de 84 (PT56) e 105 (PT105) dias, as ovelhas da raça Somalis Brasileira apresentaram maiores produtividades (P<0,05) quando comparadas às ovelhas da raça Morada Nova. O flushing de ácidos graxos não influenciou o peso dos cordeiros ao nascer, entretanto influenciou o peso total de cordeiro por ovelha parida nas idades de 28, 56, 84 e 105 dias (desmame). As ovelhas da raça Somalis Brasileira apresentaram maior produtividade de peso total de cordeiro por ovelha parida nas idades de 84 e 105 dias (Desmame). [Productive performance of ewes subjected to flushing of fatty acids]. A... Mostrar Tudo |
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Palavras-Chave: |
Flushing; Raça Somalis. |
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Thesagro: |
Ácido graxo; Nutrição animal; Ovino; Performance; Produção; Produtividade. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/94898/1/aac-Desempenho-produtivo-de-ovelhas-deslanadas-submetidas-ao-flushing.pdf
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Marc: |
LEADER 03796naa a2200277 a 4500
001 1975291
005 2014-01-10
008 2013 bl uuuu u00u1 u #d
100 1 $aSOUSA, R. T. de
245 $aDesempenho produtivo de ovelhas deslanadas submetidas ao flushing de ácidos graxos.$h[electronic resource]
260 $c2013
520 $aResumo: Os mecanismos da atuação dos lipídeos sobre o desempenho produtivo e reprodutivo de pequenos ruminantes são bastante amplos. Em razão disso, no presente estudo, investigou-se o desempenho produtivo de ovelhas deslanadas submetidas ao flushing de ácidos graxos. Aos 21 dias antes da estação de monta as matrizes foram divididas em três grupos experimentais para o fornecimento do flushing, por um período de 42 dias. No terço final de gestação e durante o período de lactação as ovelhas foram suplementadas com concentrado na quantidade de 400g/cabeça/dia. A produtividade das ovelhas não diferiu significativamente em relação ao flushing (P>0,05) para o índice de peso total de cordeiro nascido por ovelha (PNT). A produtividade dos grupos genéticos não diferiu (P>0,05) para os índices: peso total de cordeiro por ovelha nas idades de 28 (PT28) e 56 (PT56). Para os índices: peso total de cordeiro nas idades de 84 (PT56) e 105 (PT105) dias, as ovelhas da raça Somalis Brasileira apresentaram maiores produtividades (P<0,05) quando comparadas às ovelhas da raça Morada Nova. O flushing de ácidos graxos não influenciou o peso dos cordeiros ao nascer, entretanto influenciou o peso total de cordeiro por ovelha parida nas idades de 28, 56, 84 e 105 dias (desmame). As ovelhas da raça Somalis Brasileira apresentaram maior produtividade de peso total de cordeiro por ovelha parida nas idades de 84 e 105 dias (Desmame). [Productive performance of ewes subjected to flushing of fatty acids]. Abstract: The mechanisms of action of lipids on the productive and reproductive performance of small ruminants are quite large. For this reason, in the present study, we investigated the productive performance of ewes subjected to flushing fatty acids. The flushing supplementation was offered from 21 days before the breeding season for 42 days.The ewes were divided in three groups receiving one of these treatments: control (no flushing) and two levels of lipids based flushing (high or low lipid content). In the last third of pregnancy and during lactation, the ewes were supplemented with 400g/head/day of concentrate. The productivity of the sheep did not differ significantly from flushing (P>0,05) for the index of total weight of lamb born per ewe (PNT). The productivity of the genetic groups did not differ (P>0,05) for the indices: total weight of lamb per ewe at ages 28 (PT28) and 56 (PT56). For indices: total weight of lamb at ages 84 (PT56) and 105 (PT105) days, the ewes Brazilian Somalis had higher yields (P<0,05) when compared to the Morada Nova sheep. The flushing of fatty acids did not affect the weight of lambs at birth, however influenced the total weight of lamb per ewe parity at ages 28, 56, 84 and 105 days (weaning). Ewes Brazilian Somalis had higher yields of total weight of lamb per ewe parity at ages 84 and 105 days (weaning).
650 $aÁcido graxo
650 $aNutrição animal
650 $aOvino
650 $aPerformance
650 $aProdução
650 $aProdutividade
653 $aFlushing
653 $aRaça Somalis
700 1 $aBOMFIM, M. A. D.
700 1 $aFONSECA, J. F. da
700 1 $aFACO, O.
700 1 $aFONTELES, N. L. de O.
700 1 $aGONÇALVES, J. de L.
773 $tIn: CONGRESSO NORDESTINO DE PRODUÇÃO ANIMAL, 8., 2013, Fortaleza. [Anais...]. [Sobral: Universidade Estadual Vale do Acaraú; Embrapa Caprinos e Ovinos, 2013]. 4 f.
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