Influence of grazing intervals and stubble eight in elephantgrass pastures on the prodution and composition of the forage and of the milk
Keywords:
Voluntary intake, Pennisetum purpureum L. Schum., stoking rate, nutritive valueAbstract
In elephantgrass pastures, so much the grazing interval as the post grazing stubble height, they can influence, for hypothesis, the production and the quality of the milk. Like this, the objectives of this work went to evaluate the effects of two intervals of it defoliates (24 and 30 days) and of two stubble heights post grazing (50 and 100 cm), in pastures of elephantgrass cv. Napier, on the agronomic characteristics and nutritive value of elephantgrass cv. Napier, as well as the production and chemical composition of the milk of Holstein x Zebu crossbreed cows, during the rainy station. A complete randomized block design with split-splitplot arrangement was utilised, with grazing intervals assigned to plots, stubble heights to sub-plots and months to split-splitplot. The accumulation and the voluntary intake only were influenced by months of the year, with larger values of December to April (average of 1817 kg of DM/ha) and in December (2.5% of the live weight), respectively. The nutritional value of the accumulated forage did not vary in function of the evaluated period, but it did not present homogeneous tendency for the months. The stoking rate was larger during the months of November, December, January of April (average of 4,1 UA/ha) and the milk production in November and December (average of 13,2 kg/ vaca/dia). The protein and lactose tenors of the milk varied with the months of the year, being larger in May for protein (3,3%) and, those of fat and of total solids, they were larger for 24 that for 30 days (averages of 3,9 and 12,2%, versus 3,7 and 11,7%, respectively). In the rainy station, the elephantgrass pasture, was capable to provide productions of milk and stoking rates medium of 11 kg/cow/day and 3,9 UA/ha, respectively.
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