The obtained results revealed that the best treatment was the probiotic Diamond V- Original XPC at 0.5 per cent of the diet which was responsible for the significantly (P ≤ 0.05) best final bodyweight, total bodyweight gain, relative growth rate, specific growth rate, survival rate, condition factor (based on total length), return and economic efficiency among all tested materials and levels. So. It is recommended to use the feed additive Diamond V-Original XPC at 0.5 per cent of the Nile tilapia diet for improving the growth performance, survival, and production economy.
Introduction
Probiotics (specific microbial feeds with potential benefits to the host), and prebiotics (dietary components such as complex carbohydrates able to change the colonic microenvironment fostering colonization with non-enteropathogens) are areas of current interest because they offer alternatives for the management of the growing problem of multiple antibiotic resistance and overwhelming infections in the hospitalized patient (Castillo, 2008). With increasing demand for environment friendly aquaculture, the use of probiotics in aquaculture is now widely accepted (Wang et al., 2008). Hence, many studies were conducted to examine the effect of probiotics on Nile tilapia O. niloticus growth performance (Allam, 2007 and Marzouk et al., 2008). Also, many studies revealed the positive effects of probiotics on different O. niloticus stages such fry (Abdelhamid et al., 2012 and Abdel-Tawwab, 2012) and fingerlings (Mehrim, 2009 and Khalafalla, 2010). Results showed that dietary supplementation of B. subtilis at a dose of 1.35×107 cfu g−1 improved growth of juvenile large yellow croaker, L. crocea (Ai et al., 2011). Many products are commercially found in the local market; therefore, the present investigation aimed to compare among three different pre-and probiotics at three graded levels (besides control free of such additives) concerning their effects on growth performance and production economy of Nile tilapia fish in indoor feeding experiment for 16 weeks.
Materials and Methods
Experimental facilities:
Thirty glass aquaria with dimensions of 60 x 75 x 50 cm (W, L, D) were used at triplicates/treatment. All male mono-six (treated with 17 a- methyl-testosterone) Nile tilapia, Oreochromis niloticus, fingerlings were obtained from fish hatchery of the Cent. Lab. of Aqua. Res., Abbasa, Abou-Hammad. After arrival, fish were kept under the same environmental conditions and placed in fiberglass tanks for 2 weeks as adaptation period to alleviate stresses during transportation and to be adapted to new conditions. Fish were fed the control diet containing 30per cent crude protein for two weeks, during this period healthy fish of the same weight replaced the dead ones (Tables 1 and 2).
Fifteen fish/aquarium of the same initial body weight (10 g/fish) were selected and randomly distributed into ten experimental treatments (3 per-and/or probiotics x 3 levels of each + control) in triplicates. Each aquarium was supplied with compressed air via air-stones using aquarium air pumps. Settled fish wastes with one half of aquarium's water were removed daily by siphoning and water volumes were replaced by dechlarinated aerated tap water from the storage tank. Water temperature range was (26 – 28 °C). Each diet was given to fish at a rate of 3 per cent of live body weight twice daily at 9 am and 1 pm. The appointed quantity of diet was offered to fish 6 days a week throughout the experimental period.
Fish in each aquarium were weighed biweekly and the amounts of the required feed were readjusted according to the actual body weight. The dead fish was daily recorded and removed. At the end of study, fish were individually weighed and weights and lengths were measured.
Table 1: Scheme of the experimental conditions.
Table 2:Dietary levels of the experimented pre-and/or probiotics.
Feed additives:
Three preparations of commercial prebiotics/probiotics were used, mainly Aqua Superzyme, Garlen Allicin, and Diamond V (Original XPC) to test the effect of their graded levels on the productive performance of Nile tilapia fingerlings. The composition of these preparations, as claimed by the manufacturers, are shown in Tables 3, 4, and 5.
Table3: Minimum guaranteed analysis of Preparation No.1 (A) (Aqua Superzyme), each 1000 g prebiotic contain:
Table 4: Analysis of preparation No. 2 (Garlen Allicin), probiotic (G).
Experimental diets:
Chemical composition of feedstuff used in this study is presented in Table 6. Ingredient composition of the experimental diets for the 1st, 2nd and 3rd experiments are presented in Tables 7, 8, and 9 respectively. Fishmeal and soybean meal were used as sources of animal and plant protein sources, respectively, wheat bran and wheat milling by product were added in a constant percent for both (15 per cent of diet) in all the experimental diets as energy sources. Wheat milling by products served as a bender agent. Fish meals were replaced by corn starch to give a different protein levels. Vitamin and mineral premixes were added with 2 per cent for each diet. Composition of the vitamins and minerals premix is presented in Table 10.
Table 5: Analysis of preparation No. 3 (Diamond V (Original XPC), probiotic.
Table 6: Chemical composition ( per cent dry matter basis) of feedstuff used in the experimental diets.
Table 7: Ingredients composition (g/100 g) and chemical analysis ( per cent dry matter basis) of the experimental diets used in the 1st additive (A).
Table 8: Ingredients composition (g/100 g) and chemical analysis ( per cent dry matter basis) of the experimental diets used in the 2nd additive (G).
Table 9: Ingredients composition (g/100 g) and chemical analysis ( per cent dry matter basis) of the experimental diets used in the 3rd additive (XPC).
Table 10: Composition (/kg) of vitamins and minerals premix* used in the experimental diets.
Experimental conditions:
Fish were reared in fresh water. Temperature, pH, dissolved oxygen and photoperiod values were 28±2 °C , 8.5±0.2 , 7 ppm and 12/12 hours light/darkness, respectively. Water exchange rate was 30per cent daily of the total volume of rearing water.
Chemical analysis of diets:
The tested diets were analyzed in triplicates. Chemical analysis was carried out according to the methods described by A.O.A.C. (1990) for dry matter, crude protein, ether extract, crude fiber and ash. Nitrogen free extract (carbohydrate) content was calculated by subtraction the total percentages of CP, EE, CF and ash from 100. The gross energy contents of the experimental diets and fish samples were calculated by using factors of 5.65, 9.45 and 4.2 Kcal/g of protein, lipid and carbohydrate, respectively (NRC, 1993). Digestible energy content was calculated from standard physiological fuel values as 4, 4 and 9 Kcal/g of protein, carbohydrate and lipid, respectively (Garling and Wilson, 1976).
Measurements and calculations:
Gain, average daily gain (ADG), percentage average daily gain (ADGper cent), and specific growth rate (SGRper cent) were calculated according to the following equations:
Gain = final fish weith (g) – initial fish weith (g).
Gainper cent = Gain of fish (g) / initial weith of fish (g) X 100.
ADG = Gain (g) / time (DAY).
ADGper cent = {ADG / Initial weight of fish (g)}X 100.
SGR = 100 X{(In W2 – In W1) / T}
Where........... W2 is the final weight of fish (G).
Where........... W1 is the initial weight of fish (G).
In: is natural log.
T: is the period (day).
Condition factor (K) = {( Final weight) / (Final Length) 3 } X 100
Cost – benefit analysis:
Cost – benefit analysis was used to express the economic analysis due to the cost of feed and their profitability according to New (1987).
Incident cost (IC):
Incident cost is expressing the cost of feed consumed to produce one kilogram fresh fish. IC = cost of feed consumed / kg fish produced.
Profit Index (PI):
Profit index (PI) is expressed as the value of fish produced divided cost of feed.
PI = Price of fish produced / price of feed consumed.
The prices in LE/Kg (year 2012) for fish 7.000, control diet 4.087, Aqua 0.01 per cent diet 4.096, Aqua 0.02 per cent diet 4.0105, Aqua 0.03 per cent diet 4.114, Garlen 0.01 per cent diet 4.099, Garlen 0.02 per cent diet 4.112, Garlen 0.03 per cent diet 4.124, XPC 0.4per cent diet 4.147, XPC 0.5 per cent diet 4.162, and XPC 0.6 per cent diet 4.177.
Statistical analysis:
Data obtained were analyzed using one-way analysis of variance. All statistical analysis were performed according to SAS (2006). Differences were subjected to Duncan’s (1955). Multiple Range – test.
Results and Discussion
Growth performance:
Gain and survival:
The next tables present the mean values of growth performance parameters of the experimented tilapia fish fed the Aqua Superzyme containing experimental diets (Table 11), the Garlen Allicin probiotic containing experimental diets (Table 12), and the Diamond V (Original XPC) probiotic containing experimental diets (Table 13), concerning initial bodyweight (IW), final bodyweight (FW), total weifgt gain (TWG), average daily gain (ADG), relative growth rate (RGR), specific growth rate (SGR), and survival rate (SR).
The data cleared that all of the pre- and probiotics used in the present study led to significant (P ≤ 0.05) improvements in all tested criteria comparing with their controls (without additives); although, there were no significant (P ≥ 0.05) differences among the initial body weights. A1, G1, and XPC2 were the best treatments, comparing with their other levels (Tables 11, 12, and 13, respectively).
Table 11: Growth performance of Nile tilapia (O. niloticus) fish fed the Aqua Superzyme containing experimental diets.
Table 12: Growth performance of Nile tilapia (O. niloticus) fed the Garlen Allicin probiotic containing experimental diets.
Table 13: Growth performance of Nile tilapia (O. niloticus) fed the Diamond V (Original XPC) probiotic, containing experimental diets.
Table 14 presentes the comparison effect of the three treatments (additives) and three addition levels (besides the control). The best FW (75.35 g), TWG (64.39 g), RGR (587.86per cent), SGR (1.72per cent/d), and SR (100per cent) was 3*2 (XPC2 , the probiotic Diamond V- Original XPC at 0.5per cent of the diet).
Table 14: Comparison (treatment, T * level, L) of growth performance of Nile tilapia fish (O. niloticus) fed the Aqua Superzyme, Garlen Allicin, and Diamond V (Original XPC) containing experimental diets.
Amer (2012) concluded that Diamond V XP (inactive yeast a commercial product containing 100 per cent dried Saccharomyces Cerevisae distributed by DIAMOND V mils, Cidar Rapids, IOWA, and USA) could be used successfully as feed additive for feeding Nile tilapia Oreochromis niloticus without any adverse effects on their productive performance. Generally, it improves growth performance than control diet. Also, results obtained showed that using Diamond V XP at level (1.5g) had the best results on productive with levels of protein (30per cent). Moreover, it could be suggested that dietary supplement with Diamond V XP (1.5g) is useful in the intensive production system of fish.
Hassan (2013) obtained results concerning the effects of the probiotic Hydroyeast Aquaculture® on adult male O. niloticus showed that the 15 g/kg diet realized best significantly (P ≤ 0.05) values for final body weight, average weight gain, average daily gain, relative growth rate, and specific growth rate. However, about adult females' O. niloticus, the 10 g probiotic/kg diet was the best treatment concerning the significantly (P ≤ 0.05) improvement of the growth performance parameters (final body weight, AWG, RGR, ADG and SGR). So, based on the obtained results, the optimum level of the tested probiotic Hydroyeast Aquaculture® was depinding on fish sex.
Condition factor:
Data of the condition factor (K) for the experimented fish fed the Aqua Superzyme containing experimental diets (Table 15), the Garlen Allicin probiotic containing experimental diets (Table 16), and the Diamond V (Original XPC) probiotic containing experimental diets (Table 17) were calculated on the bases of standard and total lengths, respectively, It revealed that the significantly (P ≤ 0.05) highest level among the tested levels of each additive was of A1, G1, and XPC1 for both K1 and K2. However, all additives used raised the condition factor comparing with their controls, but Diamond V (Original XPC) was responsible for the highest k-factors comparing with the other additives.
Table 15: Condition factor of Nile tilapia (O. niloticus) fed the Aqua Superzyme prebiotic of the experimental diets.
Table 16: Condition factor of Nile tilapia (O. niloticus) fed the Garlen Allicin probiotic of the experimental diets.
Table 17: Condition factor of Nile tilapia (O. niloticus) fed the Diamond V (Original XPC) probiotic of the experimental diets.
Table 18 illustrates the comparison data of K-factor, it showes that the highest K-factor based on total lengths was caculated with the treatment * level 3 * 2 (XPC2, Diamond V, Original at inclusion level 0.5per cent of the diet).
Table 18: Comparison among the three additives and their inclusion levels (3 plus control) for condition factor of Nile tilapia (O. niloticus) fed the Aqua Superzyme, Garlen Allicin, and Diamond V (Original XPC) including experimental diets.
Lara-Flores et al. (2003) evaluated the effects of probiotics on growth performance in Nile tilapia under two stress factors. These stressors were dietary protein level and stocking density. The probiotics used based either upon Streptococcusfaecium and Lactobacillus acidophilus or Saccharomyces cerevisiae. Results indicated that the fry fed diets with a probiotics supplement exhibited greater growth than those led the control diet without probiotic. Of all probiotic treatments, yeast was an appropriate growth stimulating additive in tilapia cultivation. The authors stated that the increased growth rate as a positive response to added probiotics could be attributed to increased efficiency of existing digestive processes or by promoting the digestion of previously indigestible substances. In addition, probiotics may have a protein sparing effect.
Two strains of Saccharomyces cerevisiae were tested as probiotics for rainbow trout fry, during the first month of feeding. Each strain was introduced into separate diets, at the rate of 106 CFU g−1 and their effects were compared with those of a control diet. In all groups, the counts of bacteria associated with trout intestine were maximum 10 days post start feeding (dpsf; 107 CFU g−1). An autochthonous yeast, Debaryomyces hansenii, was also retrieved associated to the intestine of the control group in high numbers after 240 degree days of experiment (104–105 CFU g−1), while the colonization level was significantly less in trout fed the probiotic diets. The effect of the dietary yeast was observed by assaying the activity of three enzymes in the brush border membrane of the enterocytes: alkaline phosphatase (AP), γ-glutamyl-transpeptidase (GGT), and leucine-amino-peptidase N (LAP). Both S. boulardii and D. hansenii seemed to stimulate digestive maturation in fish, but the natural colonization by D. hansenii was likely too late for trout reared at optimal temperature. The supplementation of trout starter diet with S. boulardii may be particularly useful in fast growing conditions (Waché et al., 2006).
In an in door experiment, the prebiotic Avian Plus was evaluated by adding it at graded levels into isonitrogenous-isocaloric-diets of tilapia fish for 112 days. The obtained results revealed the superiority of the Avian Plus containing diets, particularly at level of 25 mg/kg feed which led to significantly (P ≤ 0.05) best final bodyweight, average bodyweight gain, average daily bodyweight gain, relative growth rate, and specific growth rate comparing with the control (Abdelhamid et al., 2011).
Two experiments were carried out. In both experiments, Nile tilapia fry (0.1 g initial bodyweight) were stocked into glass aquaria at 100 fry / aquarium in duplicate aquaria / treatment. The experimental diets were offered daily at a feeding rate of 10per cent of the fish biomass for 21 days (hormone-treated diets as commercially done for sex reverse) followed by 8 or 12 weeks as experimental periods in the 1st and the 2nd experiments, respectively. Bio-Mos® and T-Protphyt 2000 were added to the 1st and the 2nd experiments, respectively at graded levels. The results obtained revealed no significant (P ≥ 0.05) differences among treatments in both experiments concerning growth performance. However, the diet containing testosterone alone in the 1st experiment (T4) and that containing T-Protphyt 2000 at 4 g / Kg diet in the 2nd experiment reflected the best growth performance. The dietary inclusion of Bio-Mos® was not beneficial, whereas the dietary inclusion of T-Protphyt 2000 at 4 g / Kg diet was positively effective in increasing the growth performance of the tilapia fry (Abdelhamid et al., 2012).
Amer (2012) concluded that Diamond V XP (inactive yeast a commercial product containing 100 per cent dried Saccharomyces cerevisae distributed by DIAMOND V mils, Cidar Rapids, IOWA, and USA) could be used successfully as feed additive for feeding Nile tilapia Oreochromis niloticus without any adverse effects on their productive performance. Generally, it improves feed utilization than control diet. Also, results obtained showed that using Diamond V XP at level (1.5g) had the best results on productive with levels of protein (30per cent). Moreover, it could be suggested that dietary supplement with Diamond V XP (1.5g) is useful in the intensive production system of fish.
Hassan (2013) obtained results concerning the effects of the probiotic Hydroyeast Aquaculture® on adult male O. niloticus showed that the 15 g/kg diet realized best significantly (P ≤ 0.05) values for growth performance.
Economics:
Economically, A1, G1 and XPC2 (Tables 19, 20, and 21, respectively) were the best levels among the tested concentrations for the different substances examined in the present study. The interaction (T*L) effect on the economic efficiency of feeding Nile tilapia fish the experimental diets included Aqua Superzyme, Garlen Allicin, and Diamond V-Original (T) with their different levels (L) is given in Table 22. From which it is clear that the best economic diets are 3*2 (Diamond V-Original at 0.5per cent of the diet).
Table 19: Effect of Nile tilapia (O. niloticus) fed the Aqua Superzyme prebiptic supplementation on the economic efficiency of the experimental diets.
Table 20: Effect of Nile tilapia (O. niloticus) fed the Garlen Allicin probiptic supplementation on the economic efficiency of the experimental diets.
Table 21: Effect of Nile tilapia (O. niloticus) fed the Diamond V (Original XPC) probiotic supplementation on the economic efficiency of the experimental diets.
Table 22: Comparison effect of feeding Aqua Superzyme, Garlen Allicin, and Diamond V-Original supplementations (T) with their different levels (L) on the economic efficiency of the experimental diets fet to Nile tilapia (O. niloticus).
El-Haroun et al. (2006) and El-Haroun (2007) reported that the diets containig probiotic Biogen® realised significantly (P≤0.01) the highest net return and the lowest total cost by Nile tilapia and African catfish, respectively comparing with the control diets. Mohamed et al. (2007) also reported that dietary inclusion of Biogen® improved the economic evaluation for Nile tilapia production.
Egyptian populations of African catfish Clarias gariepinus (24.34±1.38 g) were fed a formulated diet containing approximately 31 per cent (analyzed value) crude protein and cultured for 214 days. Four levels of dried brewer's yeast, Saccharomyces cerevisiae, (DY) were used as feed additives at levels of 0.0, 1.0, 1.5 and 2.0 per cent in diets. Results showed that, adding high level of DY, 2 per cent, recorded highest final body weight (913.26 g), growth rate (4.72 g/fish/day), total production (47.5 kg/m3) and profit per cage (52.21 per cent) after 186 days. The study demonstrates that DY inclusion in the feeds of hybrid cat fish was significant. However, finding the optimal inclusion level of DY still needs more investigation of higher DY levels than 2 per cent (Essa et al., 2011).
Amer (2012) concluded that Diamond V XP (inactive yeast a commercial product containing 100 per cent dried Saccharomyces cerevisae distributed by DIAMOND V mils, Cidar Rapids, IOWA, and USA) could be used successfully as feed additive for feeding Nile tilapia Oreochromis niloticus without any adverse effects on their productive performance. Generally, it improves economic efficiency than control diet. Also, results obtained showed that using Diamond V XP at level (1.5g) had the best results on productive with levels of protein (30per cent). Moreover, it could be suggested that dietary supplement with Diamond V XP (1.5g) is useful in the intensive production system of Nile tilapia fish.
February 2014
