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| SILVESTRE, T.; LIMA, M. A.; SANTOS, G. B. dos; PEREIRA, L. G. R.; MACHADO, F. S.; TOMICH, T. R.; CAMPOS, M. M.; JONKER, A.; RODRIGUES, P. H. M.; BRANDAO, V. L. N.; MARCONDES, M. I.. |
| The dairy Nutrients Requirements of Cattle (NRC) was developed using data from purebred Holsteins and it might not accurately predict the performance of crossbred cattle. Our objectives were to evaluate the effects of two feeding levels (FLs) and three breed compositions (BCs) on nutrient intake, digestibility, performance, and methane (CH4) emissions of prepubertal dairy heifers. We used thirty-six heifers from three BCs: purebred Holstein (H), purebred Gyr (G), and F1 Holstein Gyr (HG). Each BC had 12 animals and the experiment was designed as twelve incomplete three by three Latin squares, in a factorial arrangement three by two, with three BCs and two FLs (400 and 800 g/day). Total tract nutrient digestibility was determined using total fecal... |
| Tipo: Artigo de periódico |
Palavras-chave: Eficiência alimentar; Feed efficiency; Novilho Leiteiro; Gado Mestiço; Bovino; Gado Leiteiro; Nutrição Animal; Efeito Estufa; Gás; Crossbreds; Dairy cattle; Animal nutrition; Greenhouse gases. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1133781 |
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| SILVESTRE, T.; FERREIRA, A. L.; MACHADO, F. S.; CAMPOS, M. M.; TOMICH, T. R.; PEREIRA, L. G. R.; RODRIGUES, P. H. M.; MARCONDES, M. I.. |
| We aimed to determine the energy requirements for maintenance and gain of 18 prepubertal dairy heifers of three breed compositions (BC; Holstein, Gyr, and Holstein × Gyr). Diets were formulated for gains of 0, 400, and 800 g/day, corresponding to 1.0×, 1.5×, and 2.0× maintenance, respectively. Each dairy BC had six animals with an initial body weight (iBW) of 219.8 ± 32 kg, 215.8 ± 33 kg, and 228.3 ± 33 kg for Holstein, Gyr, and Holstein × Gyr, respectively. The experiment was designed as a completely randomized design in a factorial scheme 3 × 3 [three BC and three feeding levels (FL)]. Digestibility and metabolism assays were performed to determine energy losses through feces and urine. Heat production was determined using the continuous measurement of... |
| Tipo: Artigo de periódico |
Palavras-chave: Bioenergetics; Breed composition; Indirect calorimetry; Maintenance; Bovino; Gado Gir; Gado Holandês; Calorimetria; Raça; Manutenção. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1146382 |
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| SILVESTRE, T.; PEREIRA, L. G. R.; RODRIGUES, P. H. M.; MACHADO, F. S.; TOMICH, T. R.; CAMPOS, M. M.; SANTOS, G. B.; VARGAS, M. W.; ALMEIDA, E. M.; MATA E SILVA, B. C.. |
| Tipo: Separatas |
Palavras-chave: Fermentação; Rúmen; Sistema de Produção.. |
| Ano: 2007 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/595164 |
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| MARCONDES, M. I.; SILVESTRE, T.; DIJKSTRA, J.; PROVAZZI, F. P.; SILVA, A. L.; VALADARES FILHO, S. C.; CAMPOS, M. M.; MACHADO, F. S.; ROTTA, P. P.. |
| Edição dos Anais do VII International Symposium on Energy and Protein Metabolism and Nutrition, 2022, Granada, Spain. |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Bovino; Vaca Leiteira; Gado Leiteiro; Período de Gestação; Proteína; Holstein; Pregnancy; Gestation period. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1148884 |
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| MARCONDES, M. I.; PROVAZZI, F. P.; SILVESTRE, T.; SILVA, A. L.; VALADARES FILHO, S. C.; CAMPOS, M. M.; MACHADO, F. S.; ROTTA, P. P.. |
| 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;... |
| Tipo: Artigo de periódico |
Palavras-chave: Bovino; Vaca Leiteira; Gado Leiteiro; Período de Gestação; Proteína; Holstein; Pregnancy; Gestation period. |
| Ano: 2023 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1157260 |
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