Combination of dietary pre-gelatinized starch and isomaltooligosaccharides improved pellet characteristics, subsequent feeding efficiencies and physiological status in African catfish, Clarias gariepinus, juveniles
Abstract:An 8-week study was conducted on the use of native tapioca starch (TS) or pre-gelatinized tapioca starch (PGTS), with or without the inclusion of isomaltooligosaccharides (IMO) at 0.5% on the growth, feeding efficiencies, muscle and plasma biochemical composition, intestinal short chain fatty acids (SCFA), differential cell counts, phagocytic ability/capacity, and liver glycogen content in African catfish, Clarias gariepinus. Each treatment was triplicated with each replicate consisting of 10 fish (initial wei… Show more
“…Meanwhile, the water solubility (WSI) and water absorption (WAI) indices of the RRB, ResRB, and FerRB were determined following the methods described by Romano et al () with slight modifications. Briefly, the rice bran samples were oven‐dried at 60°C and then sieved (200 µm mesh size).…”
Section: Methodsmentioning
confidence: 99%
“…After 24 hr in 10% (v/v) phosphate buffered formalin, the livers were transferred to ethanol 70% (v/v) until being further processed, embedded, and sectioned (6 μm). Sections were stained with hematoxylin and eosin or Periodic‐acid Schiff according to Romano et al ().…”
In this study, African catfish (Clarias gariepinus) (9.68 ± 0.16 g, mean ± SE) were reared with biofloc technology (BFT) with three different carbon sources; raw rice bran (RRB) or when incubated (24 hr) with Bacillus species under aeration (cellular respiration, ResRB), or without aeration (fermentation, FerRB). The proximate composition, water solubility, and total soluble sugars of RRB, ResRB, and FerRB were measured. A control included fish cultured in a recirculating system. Water quality, biofloc production/proximate composition and subsequent effects to growth, feeding efficiencies, body proximate composition, and selected plasma biochemical parameters to triplicate groups of C. gariepinus were measured after 42 days. FerRB had the lowest crude fibre and higher total soluble sugars and water solubility compared to ResRB or RRB. Biofloc produced with FerRB had significantly higher (p < 0.05) crude protein. Ammonia‐N was significantly lower (p < 0.05) in the first 3 weeks in both control and FerRB treatments. Using FerRB significantly improved (p < 0.05) growth, feeding efficiencies, and whole‐body crude protein in African catfish compared to the control and ResRB. Therefore, using FerRB with BFT can be a highly effective strategy to create a zero‐exchange culture system while also significantly improving growth and feeding efficiencies of African catfish juveniles.
“…Meanwhile, the water solubility (WSI) and water absorption (WAI) indices of the RRB, ResRB, and FerRB were determined following the methods described by Romano et al () with slight modifications. Briefly, the rice bran samples were oven‐dried at 60°C and then sieved (200 µm mesh size).…”
Section: Methodsmentioning
confidence: 99%
“…After 24 hr in 10% (v/v) phosphate buffered formalin, the livers were transferred to ethanol 70% (v/v) until being further processed, embedded, and sectioned (6 μm). Sections were stained with hematoxylin and eosin or Periodic‐acid Schiff according to Romano et al ().…”
In this study, African catfish (Clarias gariepinus) (9.68 ± 0.16 g, mean ± SE) were reared with biofloc technology (BFT) with three different carbon sources; raw rice bran (RRB) or when incubated (24 hr) with Bacillus species under aeration (cellular respiration, ResRB), or without aeration (fermentation, FerRB). The proximate composition, water solubility, and total soluble sugars of RRB, ResRB, and FerRB were measured. A control included fish cultured in a recirculating system. Water quality, biofloc production/proximate composition and subsequent effects to growth, feeding efficiencies, body proximate composition, and selected plasma biochemical parameters to triplicate groups of C. gariepinus were measured after 42 days. FerRB had the lowest crude fibre and higher total soluble sugars and water solubility compared to ResRB or RRB. Biofloc produced with FerRB had significantly higher (p < 0.05) crude protein. Ammonia‐N was significantly lower (p < 0.05) in the first 3 weeks in both control and FerRB treatments. Using FerRB significantly improved (p < 0.05) growth, feeding efficiencies, and whole‐body crude protein in African catfish compared to the control and ResRB. Therefore, using FerRB with BFT can be a highly effective strategy to create a zero‐exchange culture system while also significantly improving growth and feeding efficiencies of African catfish juveniles.
“…), steam pelleting (Zimonja & Svihus ) or simple technology, such as meat grinders (Romano et al . ). For example, when using extrusion technology, the inclusion of PG starches (broken rice or taro), created high‐quality floating pellets at both lower starch inclusion levels (15%) and lower die temperatures (Kamarudin et al .…”
Section: Implications Of Starch Gelatinization To the Physical Characmentioning
confidence: 97%
“…In this scenario, PG starches can be particularly beneficial when trying to create pellets with improved durability, water stability and water solubility (Romano et al . ). Moreover, the use of PG starches was also shown to enhance protein solubility (Romano et al .…”
Section: Implications Of Starch Gelatinization To the Physical Characmentioning
confidence: 97%
“…Moreover, the use of PG starches was also shown to enhance protein solubility (Romano et al . ). This was a major difference compared to manufacturing pellets using extrusion with higher temperatures and pressures to increase starch gelatinization (Liao et al .…”
Section: Implications Of Starch Gelatinization To the Physical Characmentioning
Starches are added macronutrients in aquafeeds to act as binders and provide inexpensive digestible energy to aquatic animals. These qualities can be further enhanced through gelatinization, which occurs when the crystalline region of amylopectin within the starch granule melts along with the leaching of amylose to form a gel matrix. This process readily occurs in the presence of heat and water, and therefore, some degree of starch gelatinization is ubiquitous in aquafeeds. When using simple technology, such as hand pelleters that employ less heat, pressure and shear forces, the inclusion of pre-gelatinized starch can effectively improve pellet quality and digestibility in aquatic animals. In this review, the implications of starch gelatinization to various pellet characteristics will first be presented, followed by a brief discussion on carbohydrate metabolism in aquatic animals. A common feature of gelatinized starch in fish includes a higher digestibility; however, the implications to growth, physiology, post-harvest quality as well as waste and disease management can depend on the host species, starch type and degree of gelatinization. This review comprehensively discusses these factors in various aquatic animals and such information may assist feed manufacturers and nutritionists to optimize cost-effective feed formulations.
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