EFFECT OF SUPPLEMENTS FERMENTED WITH POULTRY MANURE ON CONSUMPTION AND DIGESTIBILITY OF GRASS CUBA CT-115

Abstract

The digestibility of tropical pastures is low, so alternatives must be sought to improve the degradation of dry matter and its components. The objective of this study was to evaluate the effect of supplementation based on poultry manure with and without fermentation on the consumption and ruminal degradation of nutrients in Cuba CT-115 (Pennisetum purpureum). Five treatments were evaluated: T1: Cuba grass CT-115, T2: T1 + unfermented poultry manure, T3: T1 + fermented poultry manure, T4: T1 + poultry manure with polished fermented rice and T5: T1 + manure with polished unfermented rice. Five bulls with ruminal fistula and a 5 × 5 latino square design were used. Dry matter intake (DMI), in situ DM degradation (IDMD), effective ruminal DM degradation (ERDMD), OM (EROMD), CP (ERCPD), NDF (ERNDFD) and FDA (ERADFD), N-NH₃ and ruminal pH were determined. DMI was 2.5 % in supplemented diets compared to the control 2.0 % (P < 0.01). IDMD at 24 h of ruminal incubation was 46.0 % in supplemented diets compared to the control 41.8 %. The ERDMD was similar between treatments (P > 0.05). ERNDFD and ERADFD were 35.2 % y 25.0 %, 19.74 % y 33.2 % higher than grass, respectively. ERCPD was lower in supplemented diets (P < 0.01). Ruminal pH was similar among treatments (P > 0.05), with an average value of 6.6. The highest N-NH₃ concentrations (29.8 and 29.1 mg dL^-1) occurred at 3 h post-feeding in T4 and T5, respectively. The use of fermented or unfermented poultry manure in cattle diets can be an alternative to improve the efficiency of utilization of grass Cuba CT-115.