Resumo

ZACH, A. et al. Degradación ruminal de materia seca de Morus sp en caprinos en diferentes estaciones del año. Rev. vet. [online]. 2017, vol.28, n.2, pp.141-144. ISSN 1669-6840.

The aim of this work was to evaluate the ruminal degradability of dry matter (DM) of mulberry leaves in goats. The DM content was determined by drying the samples at 105°C for 12 h. In situ ruminal digestion technique was used to evaluate the degradation kinetics of DM of Morus sp in 4 castrated male goats with permanent ruminal fistula, by incubating 3 g forage samples in dacron bags with a porosity of 50 µm. Incubation times were 0, 6, 12, 24, 48 and 72 hours. Then, bags were placed in oven at 60°C for 48 h and weighed to quantify the degraded DM by difference of the remaining material. Data were analyzed with SAS and Infostat software. The results showed that the soluble fraction remained constant in autumn and spring, declining in summer (p<0.05); the rate of degradation from the slowly degradable fraction increased in summer. The slowly degradable fraction and the start time of degradation showed no time or seasonal variations. The potential degradability of DM showed high values for the three seasons, while the effective degradability -where a passage rate of 4% was assumed- remained constant. In conclusion, the high rate of degradability of DM of this forage during the three seasons of the year is notable. The high degradability of the cell wall of mulberry’s leaves is also remarkable, as it did not affect the digestion process by cellulolytic microorganisms of the rumen

Palavras-chave : goat; mulberry; dry matter; rumen; degradability.

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