Influence of the time of day on nutritive value of elephant grass cv. Cameroon und...
| Grant number: | 07/04200-3 |
| Support type: | Regular Research Grants |
| Duration: | November 01, 2007 - April 30, 2010 |
| Field of knowledge: | Agronomical Sciences - Animal Husbandry |
| Principal Investigator: | Maria Lucia Pereira Lima |
| Grantee: | Maria Lucia Pereira Lima |
| Home Institution: | Agência Paulista de Tecnologia dos Agronegócios (APTA). Secretaria de Agricultura e Abastecimento (São Paulo - Estado). Campinas , SP, Brazil |
Abstract
In Brazil the majority of the bovines are kept in pastures. The intensive grazing systems need practices how fertilization rotational system to be efficient using the great forage mass produced fodder plant, mainly during the summer. The pasture irrigation is another way to increase plant production can compensates in the beginning of spring, when the temperature and length day increased but rains are scarce. Using rotational systems were recommended the fixed days for grazing cycle, which vary as the grass species. Recent studies show that the height of plant, interception of light is 95% would be the ideal moment for beginning of the use of the pasture. The present work considers comparing the forage production in rotational systems with fixed days of grazing cycles and height of plant for use of pasture, as well as the impact of the irrigation, in the height plant system. Two experiments will be carried through simultaneously, being one in APTA, Ribeirao Preto, using a tanzania guineagrass (Panicum maximum cv. Tanzânia) pasture, submitted two treatments: fixed days for occupation versus fixed height plant for beginning of the occupation. Another experiment will be in APTA, in Mococa, using itself the rotational grazing system with marandu grass (Brachiaria brizantha cv. Marandu). The three treatments will be: fixed days of grazing cycle, fixed height of entrance and fixed height and irrigation. The animal production wil be studied thru milk production in tanzania guineagrass and weight gain in marandu grass. The variable will be studied: height of the pastures, interception of light, forage mass pre-grazing and after grazing, leaf, stem and dead material proportion, crude protein, neutral detergent fiber and acid detergent fiber of the whole plant and leaves. Also it will be studied, in the experiment using marandu grass, the impact of the cost of the irrigation and its benefits. The work will be carried through a year, collecting itself information in all the grazing cycles of this period and the comparisons also could be made between the seasons. (AU)