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![](/consulta/web/img/deny.png) | Acesso ao texto completo restrito à biblioteca da Embrapa Gado de Leite. Para informações adicionais entre em contato com cnpgl.biblioteca@embrapa.br. |
Registro Completo |
Biblioteca(s): |
Embrapa Gado de Leite. |
Data corrente: |
12/04/2024 |
Data da última atualização: |
12/04/2024 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
SACRAMENTO, J. P.; OLIVEIRA, A. S.; LEÃO, A. E.; FONSECA, A. P.; COELHO, S. G.; TOMICH, T. R.; MACHADO, F. S.; FERREIRA, A. L.; CAMPOS, M. M.; SILVI, R. R.; ROWNTREE, J. E.; RODRIGUES, J. R. P.; PEREIRA, L. G. R. |
Afiliação: |
UNIVERSIDADE FEDERAL DE SÃO JOÃO DEL-REI; UNIVERSIDADE FEDERAL DO MATO GROSSO; UNIVERSIDADE FEDERAL DE MINAS GERAIS; UNIVERSIDADE FEDERAL DE MINAS GERAIS; UNIVERSIDADE FEDERAL DE MINAS GERAIS; THIERRY RIBEIRO TOMICH, CNPGL; FERNANDA SAMARINI MACHADO, CNPGL; MARIANA MAGALHAES CAMPOS, CNPGL; UNIVERSIDADE ESTADUAL DE SANTA CRUZ; MICHIGAN STATE UNIVERSITY; UNIVERSIDADE FEDERAL RURAL DO RIO DE JANEIRO; LUIZ GUSTAVO RIBEIRO PEREIRA, CNPGL. |
Título: |
Energy requirement for primiparous Holstein × Gyr crossbred dairy cows. |
Ano de publicação: |
2024 |
Fonte/Imprenta: |
Journal of Dairy Science, 2024. |
DOI: |
https://doi.org/10.3168/jds.2023-24393 |
Idioma: |
Inglês |
Conteúdo: |
Our objective was to estimate the requirements of metabolizable energy (ME) and net energy for the maintenance (NEm) of lactating and dry cows, the efficiency of ME utilization for milk production (kl) and tissue gain (kg), and the use of body energy mobilization for milk production (kt) throughout the lactation of primiparous crossbred Holstein × Gyr cows, using open-circuit respiration chambers. Twenty-nine primiparous Holstein × Gyr crossbred cows with an initial BW averaging 563 ± 40.1 kg and 2.5 ± 0.09 years old were used throughout lactation and dry periods. The cows were kept non-pregnant throughout the study to eliminate possible confounding factors. Apparent digestibility assays, followed by calorimeter measurements, were performed 6 times throughout the lactation period. In the dry-off period, the cows were also evaluated but fed with restricted intake (DMI = 1.1% BW/d) to achieve heat production close to maintenance. After 21 d of diet adaptation, an apparent digestibility assay followed by calorimeter measurements was performed. Parameter estimates for lactation period were obtained by mixed models including lactation stage as repeated measures. For restricted feeding at dry-off and fasting period assays, the requirements were estimated by exponential regression. For whole lactation, the values of MEm and NEm were 0.588 and 0.395 MJ/BW0.75, respectively. The efficiencies kl kg kt were 0.672, 0.771, and 0.814, respectively. However, MEm and NEm were higher in early and mid-lactation than late, while kl was higher in early than other lactation stages. Dry and non-pregnant cows had MEm of 0.434 MJ/BW0.75 and NEm of 0.351 MJ/BW0.75 for maintenance level, and MEm of 0.396 MJ/BW0.75 and NEm of 0.345 MJ/BW0.75 for fasting metabolism level and efficiency of ME utilization for maintenance was 0.80. Our findings confirmed that F1 crossbred Holstein × Gyr dairy cows have differences in energy requirement and efficiency throughout the lactation stages, suggesting the use of different values in each stage. The estimated values of energy requirement for maintenance and efficiencies for primiparous lactating crossbred Holstein × Gyr were similar to those reported in the literature in specific studies and requirements systems. Keywords: efficiency, maintenance, metabolizable energy, net energy. MenosOur objective was to estimate the requirements of metabolizable energy (ME) and net energy for the maintenance (NEm) of lactating and dry cows, the efficiency of ME utilization for milk production (kl) and tissue gain (kg), and the use of body energy mobilization for milk production (kt) throughout the lactation of primiparous crossbred Holstein × Gyr cows, using open-circuit respiration chambers. Twenty-nine primiparous Holstein × Gyr crossbred cows with an initial BW averaging 563 ± 40.1 kg and 2.5 ± 0.09 years old were used throughout lactation and dry periods. The cows were kept non-pregnant throughout the study to eliminate possible confounding factors. Apparent digestibility assays, followed by calorimeter measurements, were performed 6 times throughout the lactation period. In the dry-off period, the cows were also evaluated but fed with restricted intake (DMI = 1.1% BW/d) to achieve heat production close to maintenance. After 21 d of diet adaptation, an apparent digestibility assay followed by calorimeter measurements was performed. Parameter estimates for lactation period were obtained by mixed models including lactation stage as repeated measures. For restricted feeding at dry-off and fasting period assays, the requirements were estimated by exponential regression. For whole lactation, the values of MEm and NEm were 0.588 and 0.395 MJ/BW0.75, respectively. The efficiencies kl kg kt were 0.672, 0.771, and 0.814, respectively. However, MEm and NEm were higher in earl... Mostrar Tudo |
Thesagro: |
Gado Gir; Gado Holandês; Gado Leiteiro. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
Marc: |
LEADER 03213naa a2200313 a 4500 001 2163539 005 2024-04-12 008 2024 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.3168/jds.2023-24393$2DOI 100 1 $aSACRAMENTO, J. P. 245 $aEnergy requirement for primiparous Holstein × Gyr crossbred dairy cows.$h[electronic resource] 260 $c2024 520 $aOur objective was to estimate the requirements of metabolizable energy (ME) and net energy for the maintenance (NEm) of lactating and dry cows, the efficiency of ME utilization for milk production (kl) and tissue gain (kg), and the use of body energy mobilization for milk production (kt) throughout the lactation of primiparous crossbred Holstein × Gyr cows, using open-circuit respiration chambers. Twenty-nine primiparous Holstein × Gyr crossbred cows with an initial BW averaging 563 ± 40.1 kg and 2.5 ± 0.09 years old were used throughout lactation and dry periods. The cows were kept non-pregnant throughout the study to eliminate possible confounding factors. Apparent digestibility assays, followed by calorimeter measurements, were performed 6 times throughout the lactation period. In the dry-off period, the cows were also evaluated but fed with restricted intake (DMI = 1.1% BW/d) to achieve heat production close to maintenance. After 21 d of diet adaptation, an apparent digestibility assay followed by calorimeter measurements was performed. Parameter estimates for lactation period were obtained by mixed models including lactation stage as repeated measures. For restricted feeding at dry-off and fasting period assays, the requirements were estimated by exponential regression. For whole lactation, the values of MEm and NEm were 0.588 and 0.395 MJ/BW0.75, respectively. The efficiencies kl kg kt were 0.672, 0.771, and 0.814, respectively. However, MEm and NEm were higher in early and mid-lactation than late, while kl was higher in early than other lactation stages. Dry and non-pregnant cows had MEm of 0.434 MJ/BW0.75 and NEm of 0.351 MJ/BW0.75 for maintenance level, and MEm of 0.396 MJ/BW0.75 and NEm of 0.345 MJ/BW0.75 for fasting metabolism level and efficiency of ME utilization for maintenance was 0.80. Our findings confirmed that F1 crossbred Holstein × Gyr dairy cows have differences in energy requirement and efficiency throughout the lactation stages, suggesting the use of different values in each stage. The estimated values of energy requirement for maintenance and efficiencies for primiparous lactating crossbred Holstein × Gyr were similar to those reported in the literature in specific studies and requirements systems. Keywords: efficiency, maintenance, metabolizable energy, net energy. 650 $aGado Gir 650 $aGado Holandês 650 $aGado Leiteiro 700 1 $aOLIVEIRA, A. S. 700 1 $aLEÃO, A. E. 700 1 $aFONSECA, A. P. 700 1 $aCOELHO, S. G. 700 1 $aTOMICH, T. R. 700 1 $aMACHADO, F. S. 700 1 $aFERREIRA, A. L. 700 1 $aCAMPOS, M. M. 700 1 $aSILVI, R. R. 700 1 $aROWNTREE, J. E. 700 1 $aRODRIGUES, J. R. P. 700 1 $aPEREIRA, L. G. R. 773 $tJournal of Dairy Science, 2024.
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Embrapa Gado de Leite (CNPGL) |
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Biblioteca(s): |
Embrapa Semiárido. |
Data corrente: |
15/03/2000 |
Data da última atualização: |
20/06/2018 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
Nacional - B |
Autoria: |
PINTO, J. M.; BOTREL, T. A.; MACHADO, E. C.; FEITOSA FILHO, J. C.; MEDINA, C. L. |
Afiliação: |
JOSE MARIA PINTO, CPATSA. |
Título: |
Aplicacao de CO2 via agua de irrigacao na cultura do melao em ambiente protegido. |
Ano de publicação: |
1999 |
Fonte/Imprenta: |
Engenharia Agrícola, Jaboticabal, v. 18, n. 3, p. 1-10, mar. 1999. |
Idioma: |
Português |
Conteúdo: |
O aumento da concentracao de CO2 na atmosfera tem sido utilizado como pratica de manejo para aumentar a produtividade e qualidade de varias especies vegetais. Estudos das interrelacoes dos processos produtivos com o aumento da concentracao de CO2 sao fundamentais para aumentar os conhecimentos e a eficiencia dessa pratica. Neste estudo, quantificou-se a taxa de fotossintese, a produtividade e as caracteristicas quimicas dos frutos de melao em experimento conduzido em casa-de-vegetacao com aplicacao de CO2 via agua de irrigacao. Tanto a taxa de assimilacao de CO2 como a produtividade foram maiores nas plantas submetidas ao tratamento com aplicacao artificial de CO2. As caracteristicas quimicas dos frutos nao foram alteradas pela aplicacao de CO2 via agua de irrigacao. |
Palavras-Chave: |
Melon; Photosyntesis; Plastic film covers; Productivity; Quality. |
Thesagro: |
Cucumis Melo; Dióxido de Carbono; Fertirrigação; Fotossíntese; Fruto; Irrigação; Melão; Plasticultura; Produtividade; Qualidade. |
Thesaurus NAL: |
carbon dioxide; fertigation; fruit quality; irrigation; melons; photosynthesis; plasticulture. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/178792/1/Engenharia-Agricola.-v.-18-n.-3-p.-1-10-1999.pdf
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Marc: |
LEADER 01903naa a2200433 a 4500 001 1133871 005 2018-06-20 008 1999 bl uuuu u00u1 u #d 100 1 $aPINTO, J. M. 245 $aAplicacao de CO2 via agua de irrigacao na cultura do melao em ambiente protegido. 260 $c1999 520 $aO aumento da concentracao de CO2 na atmosfera tem sido utilizado como pratica de manejo para aumentar a produtividade e qualidade de varias especies vegetais. Estudos das interrelacoes dos processos produtivos com o aumento da concentracao de CO2 sao fundamentais para aumentar os conhecimentos e a eficiencia dessa pratica. Neste estudo, quantificou-se a taxa de fotossintese, a produtividade e as caracteristicas quimicas dos frutos de melao em experimento conduzido em casa-de-vegetacao com aplicacao de CO2 via agua de irrigacao. Tanto a taxa de assimilacao de CO2 como a produtividade foram maiores nas plantas submetidas ao tratamento com aplicacao artificial de CO2. As caracteristicas quimicas dos frutos nao foram alteradas pela aplicacao de CO2 via agua de irrigacao. 650 $acarbon dioxide 650 $afertigation 650 $afruit quality 650 $airrigation 650 $amelons 650 $aphotosynthesis 650 $aplasticulture 650 $aCucumis Melo 650 $aDióxido de Carbono 650 $aFertirrigação 650 $aFotossíntese 650 $aFruto 650 $aIrrigação 650 $aMelão 650 $aPlasticultura 650 $aProdutividade 650 $aQualidade 653 $aMelon 653 $aPhotosyntesis 653 $aPlastic film covers 653 $aProductivity 653 $aQuality 700 1 $aBOTREL, T. A. 700 1 $aMACHADO, E. C. 700 1 $aFEITOSA FILHO, J. C. 700 1 $aMEDINA, C. L. 773 $tEngenharia Agrícola, Jaboticabal$gv. 18, n. 3, p. 1-10, mar. 1999.
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