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Registros recuperados : 305 | |
61. | | SILVA, F. F. da; SANTOS, T. A. dos; MACHADO, F. S.; JESUS, E. da C.; CHAER, G. M. Quantificação de rizóbios em áreas degradadas pela exploração e uso de piçarra na Caatinga. In: SIMPÓSIO DE GESTÃO AMBIENTAL E BIODIVERSIDADE, SIGABI, 7., 2018, Três Rios. Anais... Três Rios: UFRRJ, 2018. 1 p. Biblioteca(s): Embrapa Agrobiologia. |
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62. | | SILVA, F. F. da; SANTOS, T. A. dos; MACHADO, F. S.; JESUS, E. da C.; CHAER, G. M. Quantificação de bactérias fixadoras de nitrogênio em áreas de exploração mineral no Bioma Caatinga. In: SIMPÓSIO DO BIOMA CAATINGA, 2., WORKSHOP DE MUDAS E SEMENTES DA CAATINGA, 6., Juazeiro. Trabalhos... Petrolina: Embrapa Semiárido, 2018. Biblioteca(s): Embrapa Agrobiologia. |
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63. | | CAMPOS, M. M.; LOPES, F. C. F.; PEREIRA, L. G. R.; MACHADO, F. S.; TOMICH, T. R. Cana-de-açúcar na alimentação de rebanhos leiteiros. In: SILVA, F. C. da; ALVES, B. J. R.; FREITAS, P. L. de (Ed.). Sistema de produção mecanizada da cana-de-açúcar integrada à produção de energia e alimentos. Brasília, DF: Embrapa, 2017. v. 2, pt. 6, cap. 2 p. 901-938 Biblioteca(s): Embrapa Gado de Leite. |
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64. | | PÔSSAS, F. P.; RIBAS, M. N.; MACHADO, F. S.; GONÇALVES, L. C.; RODRIGUES, J. A. S.; CRUZ, D. S. G. Características agronômicas de três híbridos de sorgo com capim-sudão, normais e mutante-BMR. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 48., 2011, Belém. O desenvolvimento da produção animal e a responsabilidade frente a novos desafios: anais. Belém: SBZ, 2011. 1 CD-ROM. Biblioteca(s): Embrapa Milho e Sorgo. |
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65. | | POSSAS, F. P.; RIBAS, M. N.; MACHADO, F. S.; GONÇALVES, L. C.; RODRIGUES, J. A. S.; CRUZ, D. S. G. Caracteristicas agronomicas de tres hibridos de sorgo em capim-sudão, normais e mutantes-BMR. In: Reunião Anual da Sociedade Brasileira de Zootecnia, 48., 2011, Belém. Anais... Biblioteca(s): Embrapa Gado de Leite. |
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68. | | PEREIRA, L. G. R.; MACHADO, F. S.; TOMICH, T. R.; CAMPOS, M. M.; RIBAS, M. N.; AZEVÊDO, J. A. G. Bioeficiência e otimização de sistemas de produção de leite. In: SIMPÓSIO BRASILEIRO DE RUMINANTES LEITEIROS, 1., 2014, Uberlândia, MG. Anais... Uberlândia: UFU, 2014. p.13-32 Biblioteca(s): Embrapa Gado de Leite. |
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72. | | MACHADO, F. S.; GUIMARAES JUNIOR, R.; TEIXEIRA, A. DE M.; CAMPOS, M. M.; PEREIRA, L. G. R. A polpa citrica e a casca de soja na formulação de dietas para vacas de leite. In: SIMPÓSIO MINEIRO, 6.; SIMPÓSIO NACIONAL SOBRE NUTRIÇÃO DE GADO DE LEITE, 1., 2012, Belo Horizonte. Anais... Belo Horizonte: [s.n], 2012. p. 115-127 Biblioteca(s): Embrapa Gado de Leite. |
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73. | | PEDROZA, M. G. M.; MACHADO, F. S.; PEREIRA, L. G. R.; CAMPOS, M. M.; TOMICH, T. R.; SANT'ANNA, A. C. Treinamento de novilhas Girolando durante o período pré-parto. In: ENCONTRO ANUAL DE TOLOGIA, 35., 2017, Salvador. Anais... Salvador: Sociedade Brasileira de Etologia, 2017. p. 172. Biblioteca(s): Embrapa Gado de Leite. |
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75. | | SGUIZZATO, A. L. L.; MARCONDES, M. I.; VALADARES FILHO, S. C.; CATON, J.; NEVILLE, T. L.; MACHADO, F. S.; PACHECO, M. V. C.; ROTTA, P. P. Body composition changes of crossbred Holstein × Gyr cows and conceptus during pregnancy. Journal of Dairy Science, v. 103, n. 3, p. 2773-2783, 2020. Biblioteca(s): Embrapa Gado de Leite. |
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76. | | MACHADO, F. S.; SANTOS, G. B.; BRANDÃO, F. Z.; CARVALHO, B. C. de; CAMPOS, M. M.; VARGAS, M. W.; VARAGO, F. C.; PEREIRA, L. G. R. Body weight and body condition score of crossbred primiparous dairy cows during the first 56 days of lactation. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 51., 2014, Barra dos Coqueiros. A produção animal frente às mudanças climáticas e tecnológicas: resumos. Barra dos coqueiros: Sociedade Brasileira de Zootecnia, 2014. Biblioteca(s): Embrapa Gado de Leite. |
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77. | | MAGALHÃES, F. A.; GONÇALVES, L. C.; VELASCO, F. O.; RAMIRES, M. A.; JAYME, D. G.; FARIA JR, W. G. DE; TEIXEIRA, A. DE C.; MACHADO, F. S. Cinética de fermentação ruminal do feno do capim Brachiaria decumbens cortado em tres diferentes idades. In: Congresso Brasileiro de Zootecnia, 21., 2011, Maceió. Anais... Biblioteca(s): Embrapa Gado de Leite. |
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78. | | PÔSSAS, F. P.; GONÇALVES, L. C.; PEREIRA, L. G. R.; MACHADO, F. S.; JAYME, D. G.; RODRIGUES, J. A. S.; RODRIGUEZ, N. M.; TOMICH, T. R. Cinética de fermentação ruminal das silagens de três híbridos de milho comerciais em diferentes estádios de maturação. Arquivo Brasileiro de Medicina Veterinária e Zootecnia, Belo Horizonte, v. 67, n. 1, p. 159-165, 2015. Biblioteca(s): Embrapa Gado de Leite; Embrapa Milho e Sorgo. |
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79. | | MOREIRA, E. de A.; FERNANDES, P. B.; SOUZA, S. M. de; AZEVÊDO, J. A. G.; SANTOS, S. A.; MACHADO, F. S.; TOMICH, T. R.; PEREIRA, L. G. R. Cinética de fermentação ruminal in vitro de forrageiras nativas do Pantanal brasileiro. In: CONGRESSO INTERNACIONAL DO LEITE, 13., 2015, Porto Alegre. Anais... Juiz de Fora: Embrapa Gado de Leite, 2015. 4 p. Biblioteca(s): Embrapa Gado de Leite. |
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80. | | MOREIRA, E. de A.; FERNANDES, P. B.; SOUZA, S. M. de; AZEVÊDO, J. A. G.; SANTOS, S. A.; MACHADO, F. S.; TOMICH, T. R.; PEREIRA, L. G. R. Cinética de fermentação ruminal in vitro de forrageiras nativas do Pantanal brasileiro. In: CONGRESSO INTERNACIONAL DO LEITE, 13.; WORKSHOP DE POLÍTICAS PÚBLICAS, 13.; SIMPÓSIO DE SUSTENTABILIDADE DA ATIVIDADE LEITEIRA, 14., Porto Alegre. Anais... Juiz de Fora: Embrapa Gado de Leite, 2015. 4 p. Biblioteca(s): Embrapa Pantanal. |
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Registros recuperados : 305 | |
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Registro Completo
Biblioteca(s): |
Embrapa Gado de Leite. |
Data corrente: |
16/10/2023 |
Data da última atualização: |
22/01/2024 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
MARCONDES, M. I.; PROVAZZI, F. P.; SILVESTRE, T.; SILVA, A. L.; VALADARES FILHO, S. C.; CAMPOS, M. M.; MACHADO, F. S.; ROTTA, P. P. |
Afiliação: |
Washington State University; Universidade Federal de Viçosa; Washington State University; Universidade Federal de Viçosa; VALADARES FILHO, Universidade Federal de Viçosa; MARIANA MAGALHAES CAMPOS, CNPGL; FERNANDA SAMARINI MACHADO, CNPGL; Universidade Federal de Viçosa. |
Título: |
Protein requirements for pregnant dairy cows. |
Ano de publicação: |
2023 |
Fonte/Imprenta: |
Journal of Dairy Science, v. 106, p. 8821-8834, 2023. |
DOI: |
https://doi.org/10.3168/jds.2023-23321 |
Idioma: |
Inglês |
Conteúdo: |
We aimed to estimate the protein requirements of pregnant Holstein × Gyr cows. Sixty-one Holstein × Gyr (HG) cows were used, with an average initial BW of 480 ± 10.1 kg and 5 ± 0.5 yrs of age. Cows were divided into 3 groups: pregnant (n = 43), non-pregnant (n = 12), and baseline (n = 6). Baseline animals were slaughtered before starting the experiment to estimate the initial body composition of the remaining animals. Pregnant and non-pregnant cows received 2 diets: maintenance and ad libitum. Pregnant cows were slaughtered at 139, 199, 241, and 268 gestation days (GD). First, we used data only from non-pregnant cows to determine the requirements for maintenance and growth in adult cows. The requirements of metabolizable protein for maintenance (MPm; g/EBW0.75/d) were estimated using a linear regression between the metabolizable protein intake (MPI, g/d) and average daily gain (g/d), and the MPm was defined as the intercept divided by the average BW0.75. Net protein requirements for gain (NPg; g/d) were estimated by the first derivative of the allometric equation between final crude protein (CP) in the body (kg) and the final EBW (kg). The efficiency of use of metabolizable protein for gain (k) was calculated from the regression between the retained protein (g/EBW0.75/d) and the MPI (g/EBW0.75/d), and k was the slope of this regression. The MPI was estimated by combining microbial protein synthesis (purine derivatives) with the digestible rumen undegradable protein [(total protein intake minus RDP) × intestinal digestibility]. Second, an exponential model was used to fit the protein accumulation in the gestational components in the function of GD. The first derivative of that model was considered the net requirement for gestation (NPgest). The efficiency of protein utilization for gestation (kgest) was calculated by the iterative method using the equation: ? = MPI - (MPm + NPg/kg + NPgest/kgest). The iteration was performed aiming at a zero deviation between observed MPI and MP estimated by the requirements determined herein. We obtained a value of 3.88 g/EBW0.75/d for MPm. The estimation of NPg can be calculated according to the following equation: NPg = 0.716 × (EBWopen-0.308) × EBGcorrected, where EBWopen is the empty BW (kg) for non-pregnant animals and EBGcorrected is the empty body gain (kg/d) corrected for the gestational component. The k was determined as 0.347. The net protein requirements for gestation (NPgest) were determined as NPgest (g/d) = 0.0008722 × exp(0.01784 × GD) × (calfweight/35). The efficiency of using metabolizable protein for gestation (kgest) was 0.625. It is important to highlight that different methods of MP estimates should not be mixed and that the proposed method requires the estimate of microbial protein (estimate it via urinary estimates) and might be a limitation for practical application. In conclusion, new studies should be conducted to validate our results and the methodology adopted to determine protein requirements for pregnancy in dairy cows. Due to the pattern of protein accumulation in the gestational components, we suggest that exponential model to describe protein requirements for pregnancy for dairy cows. MenosWe aimed to estimate the protein requirements of pregnant Holstein × Gyr cows. Sixty-one Holstein × Gyr (HG) cows were used, with an average initial BW of 480 ± 10.1 kg and 5 ± 0.5 yrs of age. Cows were divided into 3 groups: pregnant (n = 43), non-pregnant (n = 12), and baseline (n = 6). Baseline animals were slaughtered before starting the experiment to estimate the initial body composition of the remaining animals. Pregnant and non-pregnant cows received 2 diets: maintenance and ad libitum. Pregnant cows were slaughtered at 139, 199, 241, and 268 gestation days (GD). First, we used data only from non-pregnant cows to determine the requirements for maintenance and growth in adult cows. The requirements of metabolizable protein for maintenance (MPm; g/EBW0.75/d) were estimated using a linear regression between the metabolizable protein intake (MPI, g/d) and average daily gain (g/d), and the MPm was defined as the intercept divided by the average BW0.75. Net protein requirements for gain (NPg; g/d) were estimated by the first derivative of the allometric equation between final crude protein (CP) in the body (kg) and the final EBW (kg). The efficiency of use of metabolizable protein for gain (k) was calculated from the regression between the retained protein (g/EBW0.75/d) and the MPI (g/EBW0.75/d), and k was the slope of this regression. The MPI was estimated by combining microbial protein synthesis (purine derivatives) with the digestible rumen undegradable protein [(total p... Mostrar Tudo |
Thesagro: |
Bovino; Gado Leiteiro; Período de Gestação; Proteína; Vaca Leiteira. |
Thesaurus NAL: |
Gestation period; Holstein; Pregnancy. |
Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/260912/1/Protein-requirements-for-pregnant-dairy-cows.pdf
|
Marc: |
LEADER 04078naa a2200313 a 4500 001 2157260 005 2024-01-22 008 2023 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.3168/jds.2023-23321$2DOI 100 1 $aMARCONDES, M. I. 245 $aProtein requirements for pregnant dairy cows.$h[electronic resource] 260 $c2023 520 $aWe aimed to estimate the protein requirements of pregnant Holstein × Gyr cows. Sixty-one Holstein × Gyr (HG) cows were used, with an average initial BW of 480 ± 10.1 kg and 5 ± 0.5 yrs of age. Cows were divided into 3 groups: pregnant (n = 43), non-pregnant (n = 12), and baseline (n = 6). Baseline animals were slaughtered before starting the experiment to estimate the initial body composition of the remaining animals. Pregnant and non-pregnant cows received 2 diets: maintenance and ad libitum. Pregnant cows were slaughtered at 139, 199, 241, and 268 gestation days (GD). First, we used data only from non-pregnant cows to determine the requirements for maintenance and growth in adult cows. The requirements of metabolizable protein for maintenance (MPm; g/EBW0.75/d) were estimated using a linear regression between the metabolizable protein intake (MPI, g/d) and average daily gain (g/d), and the MPm was defined as the intercept divided by the average BW0.75. Net protein requirements for gain (NPg; g/d) were estimated by the first derivative of the allometric equation between final crude protein (CP) in the body (kg) and the final EBW (kg). The efficiency of use of metabolizable protein for gain (k) was calculated from the regression between the retained protein (g/EBW0.75/d) and the MPI (g/EBW0.75/d), and k was the slope of this regression. The MPI was estimated by combining microbial protein synthesis (purine derivatives) with the digestible rumen undegradable protein [(total protein intake minus RDP) × intestinal digestibility]. Second, an exponential model was used to fit the protein accumulation in the gestational components in the function of GD. The first derivative of that model was considered the net requirement for gestation (NPgest). The efficiency of protein utilization for gestation (kgest) was calculated by the iterative method using the equation: ? = MPI - (MPm + NPg/kg + NPgest/kgest). The iteration was performed aiming at a zero deviation between observed MPI and MP estimated by the requirements determined herein. We obtained a value of 3.88 g/EBW0.75/d for MPm. The estimation of NPg can be calculated according to the following equation: NPg = 0.716 × (EBWopen-0.308) × EBGcorrected, where EBWopen is the empty BW (kg) for non-pregnant animals and EBGcorrected is the empty body gain (kg/d) corrected for the gestational component. The k was determined as 0.347. The net protein requirements for gestation (NPgest) were determined as NPgest (g/d) = 0.0008722 × exp(0.01784 × GD) × (calfweight/35). The efficiency of using metabolizable protein for gestation (kgest) was 0.625. It is important to highlight that different methods of MP estimates should not be mixed and that the proposed method requires the estimate of microbial protein (estimate it via urinary estimates) and might be a limitation for practical application. In conclusion, new studies should be conducted to validate our results and the methodology adopted to determine protein requirements for pregnancy in dairy cows. Due to the pattern of protein accumulation in the gestational components, we suggest that exponential model to describe protein requirements for pregnancy for dairy cows. 650 $aGestation period 650 $aHolstein 650 $aPregnancy 650 $aBovino 650 $aGado Leiteiro 650 $aPeríodo de Gestação 650 $aProteína 650 $aVaca Leiteira 700 1 $aPROVAZZI, F. P. 700 1 $aSILVESTRE, T. 700 1 $aSILVA, A. L. 700 1 $aVALADARES FILHO, S. C. 700 1 $aCAMPOS, M. M. 700 1 $aMACHADO, F. S. 700 1 $aROTTA, P. P. 773 $tJournal of Dairy Science$gv. 106, p. 8821-8834, 2023.
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