| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000436145 |
| ISSN: | 0001-3765 |
| Authors: | Rehman, Abdur1 Arif, Muhammad1 Saeed, Muhammad2 Manan, Abdul1 Al Sagheer, Adham3 El Hack, Mohamed E. Abd3 Swelum, Ayman A4 Alowaimer, Abdullah N5 |
| Institutions: | 1University of Sargodha, Department of Animal Sciences, Sargodha, Punjab. Pakistán 2Northwest A&F University, College of Animal Science and Technology, Yangling, Shaanxi. China 3Zagazig University, Department of Animal Production, Zagazig, Sharqiya. Egipto 4Zagazig University, Department of Theriogenology, Zagazig, Sharqiya. Egipto 5King Saud University, Department of Animal Production, Riyadh. Arabia Saudita |
| Year: | 2020 |
| Volumen: | 92 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Aplicado, descriptivo |
| English abstract | The present study was planned to test the hypothesis that feeding lactating dairy cattle with varying levels of rumen-undegradable protein (RUP) can enhance protein utilization, milk production, milk protein, and nitrogen (N) excretion. Forty mid-lactating crossbred (Jersey × Friesian) cattle were randomly divided into four groups. Four treatment diets were formulated to contain 30%, 40%, 50%, and 60% RUP of crude protein. Dry matter (DM) and crude protein intakes were significantly reduced with increasing dietary RUP levels. Crude protein digestibility increased linearly with incremental increases in dietary RUP levels. Cattle fed 60% RUP showed a linear decrease in N intake compared to that in the other groups. A linear decrease in urinary N and linear increases in net N, milk N, and N-use efficiency were observed with increasing dietary RUP levels. Actual milk, energy-corrected milk, and 4% fat-corrected milk yields (kg/day) increased linearly with an increasing degradability of protein. However, milk protein, solids not fat and total solids, as well as the yields of protein, fat, and lactose, showed significant increases with increased RUP supplementation. Collectively, the results indicate that formulating dairy cow diets to contain 60% RUP results in better lactating performance and N-use efficiency and lower N excretion |
| Disciplines: | Medicina veterinaria y zootecnia |
| Keyword: | Bovinos, Nutrición animal, Vacas, Jersey x Friesian, Experimentos de alimentación, Proteína no degradable, Excreción de nitrógeno, Digestibilidad, Producción de leche |
| Keyword: | Bovines, Animal nutrition, Cows, Jersey x Friesian, Feeding experiments, Undegradable protein, Nitrogen excretion, Digestibility, Milk production |
| Full text: | Texto completo (Ver HTML) Texto completo (Ver PDF) |
