Nutritional Evaluation of Soybean Hulls with or without β-Mannanase Supplement on Performance, Intestinal Morphometric and Carcass Yield of Broilers Chickens

Abstract

The objective was to evaluate the performance, intestinal morphology and carcass yield of broilers fed corn-soybean meal (SBM) diet or corn-SBM-soybean hull (SH) with or without β-mannanase supplementation. Thousand four hundred and forty Cobb Slow-male-chicks were housed design following a factorial scheme 2 x 2 (corn-SBM diet and corn-SBM-SH diet vs with and without β-mannanase), composing 4 treatments and 9 replicates each treatment, with 40 birds each replicate. At 21 days, corn-SBM diet supplemented with β-mannanase resulted in better (p<0.05) feed conversion. At 42 days, the weight gain (p<0.05) and feed intake (p<0.05) of the birds fed diets containing SH was 2.6% and 2.9% higher than that of birds fed corn-SBM diets, respectively, independent of β-mannanase supplementation. Birds supplemented with β-mannanase had a lower length of villi (p<0.05) and absorption area (p<0.05) of jejunum mucosa, and higher (p<0.05) relative liver weight. Diets with SH and without addition of β-mannanase resulted in higher relative liver weight (p<0.05) and lower percentage of fat in the carcass. It was not found statistical differences (p>0.05) in the quality of the poultry litter with the inclusion of the enzyme in the diet. The use of β-mannanase in diets with higher concentration of fiber improves the feed conversion of broilers from 1 to 21 days and can be an important nutritional and economic strategy in situations of unavailability of raw material of better quality. Corn-SBM-SH diet resulted in greater weight gain at 42 days than corn-SBM diet.

Spatial activity mapping of ß-mannanase on soybean seeds

“…It is typically stored outside of the plasmalemma, both in the primary and secondary cell walls, providing a structural as well as an energy storage function 45 . The activity of ß-mannanase at the hemicellulose of the primary cell wall and at the hull of the soybean seed was reported in previous studies 12 , 15 , 46 and is corroborated by our study with a stronger activity at the hull where galactomannans are more concentrated than in other fractions of soybean seeds 47 . It is speculated that pure mannans partially substitute cellulose in the cell wall and might instead provide the hardness and strength to the cell wall structure in soybean endosperm 9 , 48 , 49 .…”

A Way to Close the Loop: Physicochemical and Adsorbing Properties of Soybean Hulls Recovered After Soybean Peroxidase Extraction

“…Soybean ( Glycine max ) is an annual crop and today represents one of the major industrial and food crops grown in every continent (Bekabil, 2015 ), reaching a global production of over 360 million metric tons in 2018–2019 (USDA, 2019 ). Soybean hulls are one of the by-products of soybean crushing, a necessary step to produce soybean oil and meal (Poore et al, 2002 ; Scapini et al, 2018 ). Hulls represent around 8% (w/w) of the seed (Middelbos and Fahey, 2008 ; Robles Barros et al, 2020 ) and find application mainly in the animal feedstuff sector, due to their low nutrient value (Li et al, 2011 ; Balint et al, 2020 ; Robles Barros et al, 2020 ).…”

A novel consensus bacterial 6-phytase variant added to phytate-rich diets totally replaced inorganic phosphate in broilers

“…The difference in their content was modest (~10 g/kg or 1% higher in IPF vs PC). Soy hulls inclusion at >20 g/kg can have a positive effect on nutrient digestibility and growth performance (Scapini et al, 2018;Tejeda and Kim, 2020) but levels in the current study were below this and considered unlikely to have improved responses in the IPF vs PC diet. Similarly, any beneficial effect of dietary Ca reduction in the IPF diet was considered unlikely to have been a major contributor to the observed equivalence or improvements in performance responses in the (phytase supplemented) IPF compared to PC diets.…”