Mohammad Reza Rezvani; Masoud Arab; Ogholbakht Kami
Volume 21, Issue 3 , September 2019, , Pages 359-369
Abstract
This research was carried out in order to investigate the effect of peppermint, thyme and tarragon essential oils on the performance and antibody titer of broilers. In this experiment, a total number of 240 Cobb 500 broiler chickens were used in a completely randomized design with eight treatment groups. ...
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This research was carried out in order to investigate the effect of peppermint, thyme and tarragon essential oils on the performance and antibody titer of broilers. In this experiment, a total number of 240 Cobb 500 broiler chickens were used in a completely randomized design with eight treatment groups. Each treatment was replicated five times with six birds per replicate. Dietary treatments included; control, 200 mg/kg virginiamycin antibiotic, 150 and 200 mg/kg peppermint, thyme and tarragon essential oils. Chickens fed diets supplemented with antibiotic and 200 mg/kg thyme essential oil had significantly higher daily weight gain in comparison to control diet at the period of 21-42 days and 1- 42 days. Feed conversion ratio in birds fed the diets supplemented with 200 mg/kg peppermint essential oil and antibiotic was significantly improved in comparison to control diet. The highest ileum length and the best antibody titer against bronchitis and Gumboro in 42 days old chickens were recorded in150 mg/kg tarragon essential oil, 200 and 150 mg/kg peppermint essential oils, respectively. Therefore, it is recommended to supplement 200 mg/kg peppermint or thyme essential oils instead of dietary antibiotics in order to improve performance and antibody titer in broilers.
Zabihollah nemati; magsoud besharati; amir karimi
Volume 21, Issue 1 , April 2019, , Pages 49-60
Abstract
The current research was designed to evaluate the effect of dietary addition of garlic powder, Cornerian cherry fruit powder (CH) and a mixture essential oil of castor and cashew nut shell (EO) on performance, egg quality and some blood parameters in commercial laying hens. One hundred and twenty-eight ...
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The current research was designed to evaluate the effect of dietary addition of garlic powder, Cornerian cherry fruit powder (CH) and a mixture essential oil of castor and cashew nut shell (EO) on performance, egg quality and some blood parameters in commercial laying hens. One hundred and twenty-eight 58-wk-old LSL laying hens were used in 4 treatments with 4 replicates and 8 birds per each in a completely randomized design. The experimental diets included: 1) Basal diet; 2) Basal diet +1% garlic powder; 3) Basal diet+1% CH and 4) Basal diet+0.15 percent EO. The experimental diets were fed from 59 to 63 weeks of age. The productive performance was recorded from 61 to 63 weeks of age and blood and egg yolk parameters measured at the end of the experimental period. There were no significant differences in laying hen performance among all treatments. Albumen height and Haugh unit was increased in CH compared to the control group (p<0.05). The blood cholesterol, HDL, triglyceride and aspartate aminotransferase and alanine aminotransferase enzymes did not show any significant difference among treatments. The garlic and CH powders significantly decreased egg yolk cholesterol concentration (p<0.05), however it was not significantly affected by the EO. Finally, it was concluded that addition of CH and garlic powder in the diet of laying hens could improve the egg quality and reduce yolk cholesterol concentrations.
Sayedeh Forough Hosseini Vardanjani; Javad Rezaei; said dehkordi; Yousef Rouzbehan
Volume 20, Issue 4 , February 2019, , Pages 539-551
Abstract
In this study, the effect of different levels of ZnO, nano-ZnO and Zn-methionine, in pre- and post-partum diets, on feed intake, Zn absorption, microbial protein, as well as metabolites and IgG, IgM and IgA in the blood and colostrum of ewes and suckling lambs were investigated. Experiment was conducted ...
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In this study, the effect of different levels of ZnO, nano-ZnO and Zn-methionine, in pre- and post-partum diets, on feed intake, Zn absorption, microbial protein, as well as metabolites and IgG, IgM and IgA in the blood and colostrum of ewes and suckling lambs were investigated. Experiment was conducted from 50 days before to 30 days after lambing. Sixty pregnant Khorasan-Kurdish ewes were divided into six experimental groups (10 replicates) in a randomized complete block design. Experimental diets contained ZnO, nano-ZnO and Zn-methionine to meet NRC recommendation, or higher than NRC-recommended level. Replacing ZnO with nano-ZnO or Zn-methionine had no effect on different variables in ewes, but increasing Zn level in the diet of ewes resulted in an increment of daily Zn intake, a decline of Zn absorption coefficient and an increase of fecal Zn excretion (P<0.05). Feeding mother ewes with different Zn sources had no effect on blood metabolites and immunoglobulins of the suckling lambs. Overall, nano-ZnO had no positive or negative effects on ewes and suckling lambs and using Zn-methionine instead of ZnO did not improve the metabolic condition of the animals. On the other hand, the increasing dietary Zn concentration increased zinc excretion in the environment. In practice, using the conventional ZnO at the NRC recommendation level is sufficient to provide the requirement, and to maintain the immunity of pre- and post-partum ewes and there is no need for additional Zn from other sources.
Fereshteh Jamili; Farid Shariatmadari; Mohammad-amir Karimi Torshizi
Volume 15, Issue 2 , October 2013, , Pages 117-126
Abstract
This experiment was conducted to evaluate the effect of emulsifiers such as lecithin and bile salts onbroilers performances fed diet containing vegetable fats. 192 male Ross broiler chickens were randomlyallocated in a factorial experiment design of 3 × 2, consisting two sources of fat (four percent ...
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This experiment was conducted to evaluate the effect of emulsifiers such as lecithin and bile salts onbroilers performances fed diet containing vegetable fats. 192 male Ross broiler chickens were randomlyallocated in a factorial experiment design of 3 × 2, consisting two sources of fat (four percent fatty acidsor soy bean oil) and three emulsifiers (none, one percent lecithin and 0.05 percent bile salts) incompletely randomized design with four replicates and eight birds per each. Total weight gain and feedconversion ratio was not affected by fat sources while soya oil addition to diets increased feed intake(P<0.05). Emulsifiers’ addition to diet improved weight gain feed conversion ratio (P<0.05). The lengthand width of villi in jejunum, and crypt depths in duodenum were not affected by fat sources, while, cryptdepth in jejunum and width of villi in ileum of birds fed on diets containing fatty acid were higher thanother birds (P<0.05). Addition of emulsifiers to diets increased dietary metabolisable energy (P<0.05). Inconclusion, addition lecithin or bile salts to diets containing soybean oil or its fatty acids, improved bodyweight gain and feed conversion ratio in broiler chicks by increasing in absorption area of intestine anddietary metabolisable energy.