Degradabilidade ruminal do genótipo de capim-elefante Mott

Abstract

The objective of this study was to evaluate the disappearance of dry matter and estimate the potential and effective degradation of elephantgrass Mott genotype along different passage rates (2, 5 and 8% / hour) in sheep kept in the Caatinga area. The experiment was carried out in the UAST / UFRPE Ruminants Sector, with a duration of 20 days, 15 for adaptation and 5 for incubation. Three rumen-fistulated Santa Inês crossbred sheep with an average body weight of approximately 60 ± 2 kg were used. The diet consisted of elephantgrass, cottonseed, maize and mineral salt, with a ratio of 70:30. The material was collected, chopped and pre-dried at 55 ° C for 72 hours. Each set of bags was placed according to the incubation times (0, 2, 4, 6, 12, 24, 48, 72 and 96h) and removed all at once to be washed in running water until the wash water if presented clean and then dried at 55 ° C for 72 hours bags were weighed and the dry matter disappearance determined. To evaluate the disappearance of the dry matter along the incubation times, a randomized complete block design was used in the subdivided plots scheme, so that the treatment effect (Mott genotype) was allocated in the plots and the incubation time in the rumen in the subplots. Data were analyzed by Statistical Analysis Systems (SAS, version 9.1). There was a significant difference (P <0.05) in relation to the disappearance of the dry matter of the Mott elephant genotype grass during the incubation period, reaching its disappearing potential at 72 hours after incubation, after which it stabilized up to 96 hours. In relation to the potential and effective degradability of the dry matter of the Mott elephant grass genotype as a function of the different passage rates (2% / h, 5% / h, 8% / h), there was a significant effect (P <0.05). Mott genotype elephantgrass presented a soluble fraction "a" (28.79%), potentially degradable fraction "b" (47.67%), fraction degradation (b) "c" (5.10%) and non-degradable fraction "ND" (23.54%). Mott elephant grass presents a high proportion of dry matter degradable and is recommended for the production of ruminants.