Mohammad Reza Rezvani; mehdi Abbasi; Shahin Sabet
Volume 23, Issue 3 , September 2021, , Pages 471-479
Abstract
This study aimed to investigate the effect of malt extract on growth performance, nutrient digestibility, and cecum microbial population of broilers in grower, finisher, and whole periods. For this experiment, 256 pieces of mixed female and male day-old Cobb 500 broiler chicks were used in a completely ...
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This study aimed to investigate the effect of malt extract on growth performance, nutrient digestibility, and cecum microbial population of broilers in grower, finisher, and whole periods. For this experiment, 256 pieces of mixed female and male day-old Cobb 500 broiler chicks were used in a completely randomized design with 4 treatments, 8 replications, and 8 birds per replicate from 14 to 49 days of age. Experimental treatments included a basal diet without additive (control) and a basal diet containing levels of 0.1, 0.2, and 0.3 percent malt extract. The effect of treatments on growth performance, intestinal length and weight, nutrient digestibility, and the number of Escherichia coli and Lactobacillus in cecum were measured. The results showed that in grower, finisher, and whole periods, the addition of malt extract at the level of 0.3 percent, without affecting feed intake, produced the highest daily weight gain and lowest feed conversion ratio compared to other treatments (P≤0.05). Also, the diet containing 0.3 percent of malt extract improved the digestibility of dry matter, protein, and fat and decreased the number of Escherichia coli in the cecum (P≤0.05). According to the results, 0.3 percent malt extract can be used in the diet of broilers to improve the performance and health of gastrointestinal tract.
Mohammad Reza Rezvani; Fatemeh Ahmadi
Volume 23, Issue 2 , July 2021, , Pages 235-244
Abstract
Effect of red pepper in comparison to commercial growth promoters, Biostrong and Oleobiotec, on growth performance, nutrient digestibility, and other traits of broilers under heat stress conditions using 200 day-old broiler chickens mixed male and female of Arbor Acers strain in a completely randomized ...
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Effect of red pepper in comparison to commercial growth promoters, Biostrong and Oleobiotec, on growth performance, nutrient digestibility, and other traits of broilers under heat stress conditions using 200 day-old broiler chickens mixed male and female of Arbor Acers strain in a completely randomized design with four treatments, five replications and ten chickens per replicate were evaluated. Treatments included a basal diet without additives and a basal diet containing 10, 0.1, 0.15 g/kg red pepper, Biostrong, and Oleobiotec, respectively. At the beginning of third week, the birds were exposed to heat stress for six hours per day. During the 42 days of the experiment, the mean minimum and maximum temperatures were 25°C and 33°C. Feed intake, weight gain, feed conversion ratio, the weight of internal organs, caecal microflora, and precaecal nutrient digestibility were measured for the heat stress period. The use of red pepper improved the feed conversion ratio and daily weight gain in grower and finisher periods and increased protein, lipid, and dry matter precaecal digestibility, the relative weight of bursa of Fabricius, spleen, and gizzard, and decreased the Ecoli population in caecum compared to the control treatment (P≤0.05). Biostrong and Oleobiotec did not affect growth performance, prececal nutrient digestibility, and the E.coli population. Overall, using the red pepper in the diet of broilers compared to commercial growth promoters reduced the adverse effects of heat stress on growth performance, nutrient digestibility, and caecal microflora.
mohammad omidi zadeh; farshid kheiri; mostafa faghani
Volume 23, Issue 1 , March 2021, , Pages 143-153
Abstract
The effect of levels of coenzyme Q10 on performance, carcass characteristics, some blood parameters, immune system, organoleptic properties of meat and gastrointestinal tract development of Japanese quails, was conducted using 605 one- day old Japanese quails in a completely randomized design with ...
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The effect of levels of coenzyme Q10 on performance, carcass characteristics, some blood parameters, immune system, organoleptic properties of meat and gastrointestinal tract development of Japanese quails, was conducted using 605 one- day old Japanese quails in a completely randomized design with 11 treatments and 5 replicates from1 to 35 days of age. The experimental treatments included negative control, control, positive control and dietary levels of 15, 30, 45, 60, 75, 90, 105 and 210 mg/kg coenzyme Q10. The feed intake, feed conversion ratio and daily weight gain were measured in whole experimental period. The antibody titers against Newcastle and influenza vaccines and also sheep red blood cells were measured at 30 day of age. The feed conversion ratio was lower in treatment containing 210 mg/kg coenzyme Q10 than negative control treatment (P<0.01). The antibody titers against Newcastle and influenza and also SRBC were significantly increased as dietary level of coenzyme Q10 increased (P<0.01). The blood urea nitrogen concentration decreased by consumption of diets containing coenzyme Q10 than that of negative control treatment (P<0.01). The concentration of red and white blood cells and ileal crypts depth of quails fed diets containing coenzyme Q10 were higher than birds of negative control group (P<0.01). The meat redness and lightness showed improvement in quails fed diet containing 210 mg/kg of coenzyme Q10 in compared with birds of negative control treatment (P<0.01). Based on the results of this study, the addition of coenzyme Q10 up to the level of 210 mg/kg in the diet of Japanese quails improves the performance, blood parameters, immune system, and organoleptic properties of meat.