Digestibility and Physicochemical Characteristics of Tambaqui Waste Biological Silage Meal Included in Commercial Layer Diets*

Abstract

This study aimed at evaluating the effects of the physicochemical and nutritional characteristics of a biological silage meal made of tambaqui waste on dietary nutrient apparent digestibility and energy metabolism of commercial layer diets. Seventy-two 61-week-old Hisex White hens were assigned according to a completely randomized experimental design in two treatments: control diet and diet with 5% tambaqui waste biological silage meal (TWBSM), with six replicates of six birds each. The ensiled biomass presented grey brown color, acid aroma, viscous texture, 5.27±0.016pH, 96.28% dry matter (DM), 33.29% crude protein (CP), 33.65% ether extract (EE), 14.37% ashes, 13.63% non-nitrogen extract (NNE), 65.16 g.kg-1 calcium (Ca), 22.90 g.kg-1 phosphorus (P), and 5,666.07 kcal.kg-1 gross energy (GE). Higher (p>0.05) coefficients of apparent digestibility of DM, crude fiber, EE, and ash, and higher coefficient of GE metabolizability were obtained in the diet with 5% TWBSM. Due to its high CP content (33.29% on DM basis), TWBSM may be considered a protein feedstuff. Although no differences in CP digestibility (p>0.05) were detected, TWBSM presented high CP digestibility than the control diet due to proteins hydrolysis as a result of lactic fermentation by microorganisms during the ensilage process, yielding autolysed proteins of high biological value. Our results indicate that the biological silage meal produced from the residual biomass of tambaqui can be included up to 5% in commercial layer diets as it has good nutrient digestibility, and therefore, may potentially be used as a dietary energy and protein source.

Morphometric Evaluations and Yields from Commercial Cuts of Black Pacu Colossoma macropomum (Cuvier, 1818) in Different Body Weights

“…Another alternative employed is the ensilage of waste. Several authors emphasize the great potential that silage presents, which can be used in fish farming due to the similarity with the raw material that gave rise to it, providing quality nutrients, especially proteins; other characteristics that must be mentioned are the high digestibility and the lower cost in relation to fish meal [ 26 – 29 ].…”

“…The correlation is one of the ways to verify the interrelationship between relevant characters [ 9 ]. Correlations between body weights and yields with morphometric measurements have been the object of study of several studies on several species of fish such as piracanjuba ( Brycon orbignyanus ) [ 12 ], paiche ( Arapaima gigas ) [ 33 ], and tilapia ( Oreochromis niloticus ) and black pacu [ 29 ].…”

Metabolizable energy and nitrogen retention of local chickens fed rations containing fermented catfish waste

“…The metabolizable energy of feed can be increased or improved by processing the feed first [33]. One way is by fermenting.…”

“…According to [48], Positive protein retention means that the chicken's body will gain weight, and muscle or meat weaving will be formed. The higher the nitrogen retention value, the more nitrogen is left behind in growing livestock, so less protein is wasted on excreta.…”

The digestibility value of local chicken rations fed with feed containing fermented catfish waste

“…Fish waste silage substituted as much as 6-12% in rations can increase the digestibility of dry matter and protein in broiler chickens [20]. Fermented freshwater pomfret waste (Colossoma macropomum) given as much as 5% in the ration can increase the digestibility of dry matter in laying hens but does not affect protein digestibility [21].…”