Indian Journal of Animal Research

  • Chief EditorK.M.L. Pathak

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Indian Journal of Animal Research, volume 57 issue 7 (july 2023) : 882-888

Effect of Feeding Green Microalgae and Bacillus subtilis on Growth Performance, Blood Metabolites and Nutrient Digestibility of Beef Bulls in Arid Subtropics

Shaker B. AL Suwaiegh1,*
1Department of Animal and Fish Production, College of Agriculture and Food Sciences, King Faisal University, Kingdom of Saudi Arabia, P.O. Box 400 Al-Hassa, Saudi Arabia.
Cite article:- Suwaiegh AL B. Shaker (2023). Effect of Feeding Green Microalgae and Bacillus subtilis on Growth Performance, Blood Metabolites and Nutrient Digestibility of Beef Bulls in Arid Subtropics . Indian Journal of Animal Research. 57(7): 882-888. doi: 10.18805/IJAR.BF-1605.
Background: Green microalgae and Bacillus subtilis have been known to promote productive and reproductive performances in ruminant species. The present study aimed to improve productive performance, nutrient digestibility and serum metabolites upon supplementation Bacillus subtilis and green microalgae under heat stress conditions.

Methods: Eighty crossbreed beef bulls were allocated into four groups of 20 bulls each. The first group served as control, the second group was supplemented with 13 g/head/day of Bacillus subtilis, the third group was supplemented with 30 g/head/day of Dunaliella salina and the fourth group was supplemented with both B. subtilis and D. salina. Daily weight gain and total weight gain were estimated. Blood samples were collected at every four weeks of experimental period and metabolic profiles were measured.

Result: Digestibility coefficients were improved in all treated groups compared to control. Body weight gains and feed efficiencies recorded higher value in Bacillus subtilis and microalgae group. The serum total protein were higher in green microalgae compared to other groups during weeks 8 and 12. Moreover, blood urea nitrogen was higher in all treatment groups compared to control at week 12. Microalgae and combination of both microalgae and Bacillus subtilis increased hemoglobin, red and white blood cells. 
The implementation of feed additives and probiotics in animals’ diets is increasing because it is an effective approach to improve productivity and health (Mohammed and Al-Hozab, 2019; Mohammed, 2022). Bacillus spp. are gram-positive spore-forming bacteria that are resistant to heat, cold, acid and digestive enzymes (Carlin, 2011). Although they cannot colonize the intestinal tracts of animals, they can have beneficial effects on productivity. It is a transitory microorganism of the digestive tract that is nonpathogenic to animals and capable of forming spores resistant to heat and cold that are very stable in the diet (Sanders et al., 2003). Bacillus subtilis has been recognized as an effective probiotic in the livestock production. Numerous studies have been conducted to clarify the effects of Bacillus spp. supplements. Earlier researchers concluded that the effectiveness of B. subtilis in broilers as probiotics through attenuation of the pathogens with the improvement of beneficial bacteria in the gut and enhancement of average daily gain and feed efficiency (Jeong and Kim, 2014). Sun et al. (2011) concluded that the addition of B. subtilis improved calf growth and rumen development. Furthermore, in dairy cows, feeding B. subtilis improves milk yield (Sun et al., 2013).

Although little is known about the mode of action to understand the beneficial effects, it has been suggested that B. subtilis enhance an anaerobic condition in the gastrointestinal tract due to rapid oxygen utilization resulting from fermentation (Hoa et al., 2000). These effects of B. subtilis supplementation in dairy cows were examined using Holstein-Friesians characterized as high-yielding and high feed intake cows in cool temperate regions. These features lead to high heat production, accounting for 30% of the energy intake (Coppock, 1985). However, this high heat production makes the animals susceptible to heat stress.

As microalgae contributes many health effects to the humans and various researchers have exploited their antioxidant and polyphenolic contents in laboratory scale. In the present study, the effects of feeding B. subtilis or green microalgae or together on growth performance of beef bulls in arid subtropical regions were evaluated. We hypothesized that B. subtilis, green microalgae and their combination have an alleviating effect of heat stress induced by high temperature humidity index in arid areas.
Animal and management of experimental treatment
 
This experiment was carried out in Al-Ateeq farm of Saudi Arabia. Eighty crossbreed beef bull were used in this study with body weight 269.6-279.4 kg. Animals were divided randomly into four groups in equal numbers. The first group served as control group. The second group was supplemented with 13 g/head/day prepared B. subtilis PB6 product (6.6 × 109 colony forming units/g). The third group was supplemented with 30 g/head/day of Dunaliella salina. The fourth group was supplemented with both B. subtilis (13 g) and D. salina (30 g/head/day). The animals were fed on concentrate fed mixture (CFM), hay and wheat straw to give the requirement of dry matter (DM) and total digestible nutrients (TDN) for average body weight and daily gain of beef according to NRC (2000) requirements (Table 1). Experimental period lasted 120 days.

Table 1: Chemical composition (%) of ingredients on dry matter basis.


 
Climatic conditions
 
Ambient temperature and relative humidity were recorded during the experimental period. Air temperature and relative humidity were calculated monthly during the experimental period from June to October. Values of temperature-humidity index (THI) were calculated as
 
THI = (1.8 × T + 32) - [(0.55-0.0055 × RH) × (1.8 × T -26)],
 
Where,
T = Temperature expressed as °C.
RH = Relative humidity (%) was based on Dikmen et al., (2008).  
                           
Temperature, humidity and temperature-humidity index in this region were shown in Table 2.

Table 2: Ambient temperature, relative humidity and temperature humidity index during experimental period inside the barn.


 
Blood sampling
 
About 10 ml of blood samples were collected from 5 bulls of each group at day 0, 4, 8 and 12 weeks of experimental period. The collected blood were used for determination of red blood cells, hemoglobin, hematocrit, white blood cells, neutrophils and lymphocytes in addition to biochemical metabolites.
 
Digestibility coefficient and nutritive values
 
Fecal sample was collected at the last week of the experimental period twice daily at 07:00 am and 02:00 pm directly from the rectum and then it was frozen until analysis. Fecal and rations samples were ground through 1 mm mill screen and mixed together then analyzed for DM, organic matter (OM), crude protein (CP), crude fiber (CF) and ether extract (EE) according (AOAC, 1995). Digestibility coefficients of DM, OM, CP, CF, EE and NFE were determined using acid insoluble ash (AIA) as internal marker according to Van Keulen and Young (1977). The nutritive values total digestible nutrients (TDN) and digestible crude protein (DCP) of the experimental rations were calculated.
 
Growth performance
 
Body weight (BW) of animals was recorded at the beginning of experimental period and monthly thereafter. Final BW, total gain and daily gain were calculated. Total feed intake was recorded during the experimental period. Values of daily average feed intake, gain and feed efficiency were calculated.
 
Statistical analysis
 
Data were analyzed using General Linear Model (GLM) procedure of SAS (SAS, 2004) according to the following model:
 
 
Yij = μ + Ti+ Eij;
 
Where,
Yij = The observation.
μ = The overall mean.
Ti = Effect of treatments.
Eij = Standard error.

Duncan’s multiple range tests were used to compare between means of the control and treated groups (P<0.05).
 
Growth and Productive performance of beef bulls
 
The highest body weight gain was found in bulls received a mixture of B. subtilis and green microalgae when compared to control and B. subtilis groups, while there was no significant difference to green microalgae group (Table 3).

Table 3: Effect of Bacillus subtilis and green microalgae and their mixture supplementation on productive performance of beef bulls.



Digestibility coefficient and nutritive value were improved in groups supplemented with green microalgae and a mixture of green microalgae and B. subtilis (Table 4).

Table 4: Effect of Bacillus subtilis and green microalgae supplementation on nutrients digestibility coefficient and nutritive values of experimental rations.



Bacillus subtilis and/or green microalgae supplementation increased values of total digestible nutrients, starch value, digestible crude protein and digestible energy. The significant effects of Chlorella vulgaris algae or green microalgae on body health and productive performances were confirmed in several studies (Kholif et al., 2020). It has been proved higher body weight gain and nutrient digestibility due to green microalgae or B. subtilis supplementation in several studies (Kholif et al., 2020; Jia et al., 2022). This may be due to the increasing digestibility of nutrients, which may be attributed to the accumulation of large amounts of readily fermentable carbohydrates liberated by the action of the bacteria and probiotics in the bulls’ rations (Mousa et al., 2022). The improvement in most nutrient digestibility parameters could be attributed to B. subtilis and high protein content and b-carotene in green microalgae. This may improve the ruminal microbial activity and communities, thus increasing the gut health through rumen maturity by favoring microbial establishment, increasing the fiber digestion of feedstuff, reducing the fluid viscosity and ruminal ammonia and improving the concentration of volatile fatty acids in the rumen (Jiang et al., 2020). B. subtilis have been used as beneficial supplements in farm animals to lower morbidity and mortality (Rai et al., 2013), improve feeding performance (Jia et al., 2018). Moreover, green microalgae provides organic acids and vitamins to stimulate the growth of lactic acid bacteria, which improve rumen metabolism by stabilizing the rumen pH, increasing the production of cellulolytic bacteria and improving anaerobiosis by scavenging the oxygen available in the rumen, as well as improving microbial protein synthesis and fiber digestibility (Bomba et al., 2002).
 
Blood parameters
 
B. subtilis and green microalgae supplementation to bulls improved the hematological and immunological parameters (Fig 1).

Fig 1: Effects of Bacillus subtilis and green microalgae supplementation on packed cell volume (A), RBCs (B) and hemoglobin (C), WBCs (D), lymphocytes (E) and neutrophils (F) concentrations.



Other studies concluded that hematological profile showed an insignificant change between different groups (Justine and Oluwatosin, 2008; Al-Mufarji et al., 2022). This indicated the improved health status of the supplemented beef bulls. Such effects may be due to the improved synthesis of vitamin B12 by B. subtilis and higher content of green microalgae with vitamins B1, B2, B3, B6, B12, E, K and D (Becker, 2007) and improved iron salt absorption by the small intestine, resulting in better hematopoiesis (LaFleur-Brooks and LaFleur-Brooks, 2008). White blood cells are a major component of the body’s immune system and are extremely important in defending the body against infections. The results of WBC count were consistent with those obtained by earlier reports (Milewski and Sobiech, 2009) who found that B. subtilis and green microalgae in bulls had a greater WBC count that participated in increasing lymphocyte percentages in the leukogram (Talha et al., 2009).
 
Biochemical parameters
 
B. subtilis and green microalgae supplementation to bulls improved the serum biochemical parameters (Fig 2).

Fig 2: Effects of B. subtilis and green microalgae supplementation on total protein (A), blood urea nitrogen (B), creatinine (C), glucose (D), alanine aminotransferase (E) and aspartate aminotransferase (F) concentrations.



The B. subtilis and green microalgae supplementation in our study increased blood total protein. This effect is expected, as protein digestibility was improved in the treated groups. The increased activity of hepatic function is suggested when green microalgae were fed (Tousson et al., 2011), which resulted in higher concentration of total proteins as recorded in the present study. In fact, probiotics can synthesize protease enzymes and, thus, provide some specific amino acids that can boost microbial protein synthesis (Talha et al., 2009). Furthermore, microalgae biomass microalgae contain 40-70% proteins (Becker, 2007) and is rich in proteins that compete favorably, in terms of quantity and quality, with conventional food proteins such as soybeans, eggs and fish, making the unicellular organisms a promising source of food protein (Batista et al., 2013).

B. subtilis and microalgae supplementation improved energy status of beef bulls as indicated by glucose concentration. This enhancement can be associated with improved gluconeogenesis. Earlier studies have demonstrated that probiotic supplementation can improve gluconeogenesis by increasing propionate concentrations with a significant effect on glucose concentration in ruminants (Sayed, 2003). Furthermore, propionate is considered as the primary gluconeogenic volatile fatty acids used for glucose biosynthesis (Vanhatalo et al., 2003). In addition, earlier reports found that the concentrations of total cholesterol and triglycerides were high in the green microalgae groups (Senosy et al., 2017; Kholif et al., 2020; Al-Mufarji et al., 2022).

Blood urea nitrogen concentration can be used as an indicator of protein status as well as nitrogen utilization (Whang et al., 2003; Mohammed et al., 2019; 2020). The concentration of BUN increased as nitrogen intake increased up to a certain level and then reached a plateau. This can explain why increased nutrient density led to higher BUN concentration in the current study. Urea nitrogen is a major waste product of protein catabolism. Our results were contrary to those of earlier researchers regarding lower blood urea nitrogen and creatinine (Senosy et al., 2017; Odhaib et al., 2018).

The increased AST and ALT activities may also be associated with disorders in the energy metabolism of the body as well as stress (Odhaib et al., 2018). Thus, the similarity in the levels of serum AST and ALT among the treatments is an indication that the supplementation of B. subtilis or green microalgae had no detrimental effects on tissues and organs in beef bulls. Higher levels of AST can be a clue of liver damage, especially when paralleled with increased ALT (Pagana and Pagana, 2006). Moreover, the AST levels reported in the present study fall well within the normal bovine range (Aiello and Moses, 2019; Al-Mufarji et al., 2022).
B. subtilis and green microalgae increased the nutrient digestibility, the feed intake, feed conversion, daily weight gain and total weight gain of beef bulls compared with the control. The supplementation also improved the hematological and biochemical parameters with protective effects on renal function and positive effects on energy metabolism.
This work was supported through the Annual Funding track by the Deanship of Scientific Research, Vice Presidency for Graduate Studies and Scientific Research, King Faisal University, Saudi Arabia (GRANT2601).
 
None

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