Abstract
This study aimed to evaluate the effects of soybean hulls inclusion in the silage of wet brewery waste. The experimental design was randomized in block, where the treatments were constituted by four levels of soybean hulls on the silage (0, 15, 25, and 35%), with three (silos) replicates per treatment. All data collected were subjected to ANOVA and subsequent polynomial regression at 5%. Soybean hulls inclusion caused a linear increase (p < 0.05) in the pH, dry matter, acid detergent fiber, neutral detergent fiber and total carbohydrates content of the silage. This inclusion also caused a significant reduction (p < 0.05) in the effluent losses and percentages of crude protein, fats, hemicellulose, non-fibrous carbohydrates and total digestible nutrients. Thus, it was concluded that soybean hulls can be used as an additive in the silage of wet brewery waste. Up to 35% of inclusion, there was a significant reduction in the effluent losses, a little increase on pH and enrichment of nutritional content, especially in the dry matter.
Highlights
Each feedstuff used to produce the silage in this study presented an individual chemical composition similar to those observed in previous studies (Aliyu & Bala, 2011; Bastos et al, 2015; Chanie & FieVez, 2017), where wet brewery waste presented a low dry matter content, and soybean hulls a high dry matter content
The use of soybean hulls may cause an effective increasing in the nutrients content of wet brewery waste silage, especially due to soybean hulls may provide an increase in the dry matter
Neutral detergent fiber (y = 1.1875x2 − 3.4785x + 49.437; R2 = 0.76) and non-fibrous carbohydrates (y = −0.65x2 + 3.202x + 23.435; R2 = 0.90) content presented a quadratic effect (p < 0.05) where the higher inclusion of soybean hulls on silage caused a great increase on neutral detergent fiber content and reduction on non-fibrous carbohydrates content (Table 3). These results indicated that increase levels of soybean hulls in the silage of wet brewery waste may promote a significant effect on its chemical composition, especially on dry matter and its main nutrients
Summary
Wet brewery waste is a typical example of alternative food, being used in diets for ruminants due to its high nutritional content, especially energy and protein, and great availability along the year for a low cost, which may minimize the costs with animal feeding (Souza et al, 2012). This food is a by-product of brewery industry which uses malted barely grains as feed stock. In the feeding of ruminants, wet brewery waste can be used as a protein concentrate (23 to 30% crude protein), insoluble and of low degradability, constituting as a protein source, passing through ruminal degradation and being absorbed directly in the intestine (Orr, Henley, & Rude, 2008; Albuquerque et al, 2011; Faccenda et al, 2017; Halmemies-BeauchetFilleau et al, 2018)
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