Majid Ebrahimpour; Farzad Bagherzadeh Kasmani; Mostafa Yousef Elahi; Mahmoud Ghazaghi
Abstract
The effect of dried corn steep liquor (DCSL) and probiotics on growth performance, intestinal microbial population and humoral immune response of broilers using 320 one-day-old Ross 308 broilers in a 2 × 4 factorial arrangement experiment with four DCSL levels (zero, two, four and six percent) ...
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The effect of dried corn steep liquor (DCSL) and probiotics on growth performance, intestinal microbial population and humoral immune response of broilers using 320 one-day-old Ross 308 broilers in a 2 × 4 factorial arrangement experiment with four DCSL levels (zero, two, four and six percent) and two levels of probiotic LactoFeed® (zero and 150 mg/kg) were evaluated in a completely randomized design with eight treatments, four replicates and 10 birds per replication for 42 days. Body weight gain, feed intake, feed conversion ratio, lactic acid and coliform bacterial populations, as well as the response of broiler chickens' humoral immune system against Newcastle disease, bronchitis and influenza viruses were measured. In the grower, finisher and whole period effect of LactoFeed probiotics and DCSL and their interaction on body weight gain and feed conversion ratio were not significantly different. In the starter period, birds fed diets containing four percent DCSL consumed more feed and gained more weight than chickens fed diet without DCSL (P<0.05). Interaction of six percent DCSL and probiotic increased feed intake in the starter period compared to diet lacking these compounds (P<0.05). The greatest antibody titer against Newcastle disease, influenza and bronchitis viruses was observed at six percent of DCSL (P<0.05). The interaction of DCSL and probiotics decreased the population of coliforms and increased the population of lactic acid bacteria (P<0.05). According to the results of this study, the use of DCSL and probiotics in the diet of broilers improves the humoral immune response and intestinal microbial population.
Hamideh Nouri Sadegh; Ali Maghsoudi; Mohammad Rokouei; Hadi Faraju-Arough; Mehdi Jahantigh
Abstract
In the current research, immune system responses against sheep red blood cells (SRBC) and Newcastle disease virus (NDV) in two sexes of both wild and Italian speckled quails were investigated. To compare phenotypic differences of two sexes for humoral immune responses a one-way analysis was applied, ...
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In the current research, immune system responses against sheep red blood cells (SRBC) and Newcastle disease virus (NDV) in two sexes of both wild and Italian speckled quails were investigated. To compare phenotypic differences of two sexes for humoral immune responses a one-way analysis was applied, and a simple animal model using the MCMCglmm package of R software was used for genetic analysis, assuming variance components between the two sexes are different. Phenotypic comparison between males and females did not show a significant difference in any of the strains. In both strains, heritability of humoral immunity in males was higher than females. Results showed, in wild strain, heritability of IgT in males (0.187), and IgY in females (0.177) were higher than other estimates. The highest heritability was related to the NDV, which was estimated to be 0.214 and 0.268 in males and females, respectively. Therefore, genetic selection for IgN can be expected to improve the performance of the birds’ humoral immune system. Likewise, according to the higher estimates of immune responses in males, genetic selection of humoral immune responses for IgN, leads to higher genetic progression.
Kazem Karimi
Abstract
In order to investigate the effects of the Tarragon byproducts on the growth performance, carcass traits, cellular and humoral immunoresponse of broilers, one-day- old one hundred sixty-eight Ross 308 chicks were randomly allocated in to four treatment groups in 24 cages (6 replicates per treatment) ...
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In order to investigate the effects of the Tarragon byproducts on the growth performance, carcass traits, cellular and humoral immunoresponse of broilers, one-day- old one hundred sixty-eight Ross 308 chicks were randomly allocated in to four treatment groups in 24 cages (6 replicates per treatment) and 7 chicks per replicate. The treatments were included: 1) basal diet (control), 2) basal diet + 500 μl/lit Hydro alcoholic extract of tarragon in drinking water, 3) basal diet + 1% dietary tarragon powder and 4) basal diet + 1% dietary tarragon powder + 500 μl/lit of tarragon extract in drinking water. Results indicated that at the starter, grower, finisher and total periods of time, the birds that were recived 1% dietary tarragon powder had a better growth performance rather than other birds, so that, feed intake and weight gain were significantly increased (P ≤ 0.05) and feed conversion ratio was improved. In these birds, the relative weights of carcass and bursa of Fabresious was also greater than other birds (P ≤ 0.05). No significant differences were observed in the cellular immunity response (change in foot membrane thickness in response to Phytohemagglutinin injection) and humoral imiunity response (antibody response to Newcastle virus and antibody response to injected SRBC) due to treatments. Based on the results, the use of one percent tarragon powder in the diet of broilers is recommended to improve the growth efficiency and carcass yield.