Tayebeh Omidvar; Saied Mohammadzadeh; mosayeb amiri
Volume 24, Issue 2 , July 2022, , Pages 237-246
Abstract
To investigate the effect of rosemary powder on semen parameters and DNA fragmentation under heat stress, 40 native rooster aged 42 weeksand weighted of 2300 gramswere usedin a factorial experiment in randomized complete block design with two levels of temperature (normal and heat stress) and rosemary ...
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To investigate the effect of rosemary powder on semen parameters and DNA fragmentation under heat stress, 40 native rooster aged 42 weeksand weighted of 2300 gramswere usedin a factorial experiment in randomized complete block design with two levels of temperature (normal and heat stress) and rosemary powder (0 and 7.5 gr/kg of diet) during 7 weeks. Heat stress and normal temperature was set 28±2ºC and 18-22º C,respectively.After two weeks adaptation,the semen sampleswere collected twice in a week from roosters during 5 weeks using dorso-abdominal massage method. The semen parameters including motility, viability ratio and DNA fragmentation were evaluated. The results showed that heat stress significantly reduced the progressive motility of sperm (type A) and with the addition of rosemary powder, sperm viability increased (P˂0.05). Addition of rosemary leaf powder at normal temperature decreased the DNA fragmentation ratio (P˂0.05). In roosters under heat stress,the DNA fragmentation rate of sperm increased and the damage rate decreased significantly with the feeding of rosemary powder (P˂0.01). According to the results of this study, adding rosemary powder to the diet of native old roosters under heat stress conditions can improve some reproductive traits
abbas ashoori; Alireza Behnamifar
Volume 19, Issue 3 , November 2017, , Pages 685-696
Abstract
The effects of the herbal extracts (Rosemary officinalis L., Salvia officinalis), propolis, virginiamycin antibiotic and the herbal coccidiostat were studied on broiler chickens challenged with two E. coli strains (O78K80 & O2K12). A total of 476 female cobb 500 broilers was allocated in a completely ...
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The effects of the herbal extracts (Rosemary officinalis L., Salvia officinalis), propolis, virginiamycin antibiotic and the herbal coccidiostat were studied on broiler chickens challenged with two E. coli strains (O78K80 & O2K12). A total of 476 female cobb 500 broilers was allocated in a completely randomized design considering seven treatments with four replicates and 17 birds per each for 42 days. Negative and positive control groups received a basal diet with no supplementation. The two herbal groups received a basal diet with 1 mL of ethanol herbal extracts (Rosemarinus officinalis & Salvia officinalis) / L drinking water, respectively. The virginiamycin (10%), the herbal coccidiostat and the ethanol extract of propolis groups fed the basal diet plus 150, 200 and 500 mg / kg diet, respectively. All groups except negative control challenged with two E. coli strains (O78K80 & O2K12) in 14d of rearing period. Herbal extract decreased the intestinal population of E. coli and Salmonella compared to the positive control (P<0.05). In the rearing period, feed conversion ratio and feed intake in chickens received herbal extracts and herbal coccidiostat were significantly lower than control groups (P<0.05). Birds that received rosemary and propolis had the lowest relative weight of the breast compared to other treatments (P<0.05).Herbal extracts decreased the cholesterol and increased HDL levels of serum (P<0.05). It could be concluded that the herbal extracts can be used as an alternative to antibiotics as growth promoters in broiler chicks.