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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
01/10/2009 |
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Data da última atualização: |
08/02/2010 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SOUZA, J. C. de; FREITAS, J. A. de; MALHADO, C. H. M.; SERENO, J. R. B.; SANTOS, I. W. dos; VENDRÚSCULO, E. G.; FERRAZ FILHO, P. B. |
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Afiliação: |
J. C. de Souza, Missoury University; J. A. de FREITAS, Bolsista; C. H. M. Malhado, UESB; José Robson Bezerra Sereno, CPAC; I. W. dos Santos, UFPR; E. G. Vendrúsculo, UFPB; P. B. Ferraz Filho, UFMS. |
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Título: |
Desempeño de becerros cruzas europeo-cebú en Brasil. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Asociación Latinoamericana de Producción Animal, v. 16, n. 3, p. 116-120, 2008. |
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Idioma: |
Espanhol |
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Conteúdo: |
El objetivo fue evaluar la influencia de los factores genéticos y ambientales sobre el peso al nacer y al destete de becerros cruzas europeo x cebú, criados en pasturas cultivadas con alimentación suplementaria. Se utilizaran 482 registros de becerros hijos de vacas Nelore (NE), Hereford (HE), Aberdeen x Nelore (½ AB ½ NE) y Limousine x Nelore (½ LI ½ NE), apareados con toros de las razas Charoláis (CH), Hereford (HE) y Red Angus (RE). El primer modelo utilizándose los efectos fijos del sexo del becerro, tipo de apareamiento,
mes del parto, raza del toro y raza de la vaca. El segundo fue compuesto por raza del becerro, sexo, interacción raza x sexo, tipo de apareamiento, mes del parto; el tercero modelo fue semejante al segundo, pero la raza del becerro fue desmembrada con relación a composición genética de los becerros, levando en consideración la participación de lo Nelore, variando de 0, ¼, e ½. Al destete los machos del grupo genético CHLINE y de las hembras RELINE fueron los agrupamientos que presentaron mayor peso. Con relación a los pesos de acuerdo con la composición genética, machos ½ Nelore fueron más leves al nacer. Sin embargo, al destete, los animales ¼ Nelores fueron más pesados, seguidos de los ½ sangre, 15,84% e 2,92%, respectivamente, debido probablemente en función de la heterosis y de la mejor habilidad materna de las vacas ½ sangre. Los becerro(a)s ¼ Nelore presentaron elevado peso al destete, mostrándose como una buena opción para programas de cruzamientos. MenosEl objetivo fue evaluar la influencia de los factores genéticos y ambientales sobre el peso al nacer y al destete de becerros cruzas europeo x cebú, criados en pasturas cultivadas con alimentación suplementaria. Se utilizaran 482 registros de becerros hijos de vacas Nelore (NE), Hereford (HE), Aberdeen x Nelore (½ AB ½ NE) y Limousine x Nelore (½ LI ½ NE), apareados con toros de las razas Charoláis (CH), Hereford (HE) y Red Angus (RE). El primer modelo utilizándose los efectos fijos del sexo del becerro, tipo de apareamiento,
mes del parto, raza del toro y raza de la vaca. El segundo fue compuesto por raza del becerro, sexo, interacción raza x sexo, tipo de apareamiento, mes del parto; el tercero modelo fue semejante al segundo, pero la raza del becerro fue desmembrada con relación a composición genética de los becerros, levando en consideración la participación de lo Nelore, variando de 0, ¼, e ½. Al destete los machos del grupo genético CHLINE y de las hembras RELINE fueron los agrupamientos que presentaron mayor peso. Con relación a los pesos de acuerdo con la composición genética, machos ½ Nelore fueron más leves al nacer. Sin embargo, al destete, los animales ¼ Nelores fueron más pesados, seguidos de los ½ sangre, 15,84% e 2,92%, respectivamente, debido probablemente en función de la heterosis y de la mejor habilidad materna de las vacas ½ sangre. Los becerro(a)s ¼ Nelore presentaron elevado peso al destete, mostrándose como una buena opción para programas de cruzamien... Mostrar Tudo |
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Palavras-Chave: |
Bovinae; Parâmetros genéticos. |
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Thesagro: |
Bovino; Gado Nelore; Genética Animal. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02249naa a2200253 a 4500
001 1570873
005 2010-02-08
008 2008 bl --- 0-- u #d
100 1 $aSOUZA, J. C. de
245 $aDesempeño de becerros cruzas europeo-cebú en Brasil.
260 $c2008
520 $aEl objetivo fue evaluar la influencia de los factores genéticos y ambientales sobre el peso al nacer y al destete de becerros cruzas europeo x cebú, criados en pasturas cultivadas con alimentación suplementaria. Se utilizaran 482 registros de becerros hijos de vacas Nelore (NE), Hereford (HE), Aberdeen x Nelore (½ AB ½ NE) y Limousine x Nelore (½ LI ½ NE), apareados con toros de las razas Charoláis (CH), Hereford (HE) y Red Angus (RE). El primer modelo utilizándose los efectos fijos del sexo del becerro, tipo de apareamiento, mes del parto, raza del toro y raza de la vaca. El segundo fue compuesto por raza del becerro, sexo, interacción raza x sexo, tipo de apareamiento, mes del parto; el tercero modelo fue semejante al segundo, pero la raza del becerro fue desmembrada con relación a composición genética de los becerros, levando en consideración la participación de lo Nelore, variando de 0, ¼, e ½. Al destete los machos del grupo genético CHLINE y de las hembras RELINE fueron los agrupamientos que presentaron mayor peso. Con relación a los pesos de acuerdo con la composición genética, machos ½ Nelore fueron más leves al nacer. Sin embargo, al destete, los animales ¼ Nelores fueron más pesados, seguidos de los ½ sangre, 15,84% e 2,92%, respectivamente, debido probablemente en función de la heterosis y de la mejor habilidad materna de las vacas ½ sangre. Los becerro(a)s ¼ Nelore presentaron elevado peso al destete, mostrándose como una buena opción para programas de cruzamientos.
650 $aBovino
650 $aGado Nelore
650 $aGenética Animal
653 $aBovinae
653 $aParâmetros genéticos
700 1 $aFREITAS, J. A. de
700 1 $aMALHADO, C. H. M.
700 1 $aSERENO, J. R. B.
700 1 $aSANTOS, I. W. dos
700 1 $aVENDRÚSCULO, E. G.
700 1 $aFERRAZ FILHO, P. B.
773 $tAsociación Latinoamericana de Producción Animal$gv. 16, n. 3, p. 116-120, 2008.
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Embrapa Cerrados (CPAC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Leite. |
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Data corrente: |
12/04/2024 |
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Data da última atualização: |
12/04/2024 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 1 |
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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. |
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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. |
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Título: |
Energy requirement for primiparous Holstein × Gyr crossbred dairy cows. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Journal of Dairy Science, 2024. |
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DOI: |
https://doi.org/10.3168/jds.2023-24393 |
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Idioma: |
Inglês |
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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 |
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Thesagro: |
Gado Gir; Gado Holandês; Gado Leiteiro. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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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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