جستجوی مقالات مرتبط با کلیدواژه « broiler chickens » در نشریات گروه « محیط زیست »

In this study, the effect of different feed additives and supplements on the growth performance of broiler chickens under heat stress was investigated. This study was performed in a completely randomized design using 380 one-day-old broiler chickens (male and female mixture) of Ross 384 strain. They were divided based on the same average weight. Experimental treatments are: 1- control treatment + standard temperature conditions, 2- control treatment + heat stress conditions, 3- control treatment + heat stress conditions + vitamin E + Organic Se, 4- control treatment + heat stress conditions Q10 + Vit C , 5- control treatment + heat stress conditions + ubiotics (probiotics + prebiotics + phytobiotics), 6- control treatment + heat stress conditions + 10% increase in diet methionine, 7- control treatment + heat stress conditions + increase of 20% to Diet methionine and 8- control treatment + heat stress conditions + traditional method (consumption of ice and non-alcoholic beer in drinking water). The results of feed consumption showed that there was a significant difference in the final and total periods between the experimental treatments (p <0.05). The results of body weight gain showed that there was a significant difference in all measurement periods between experimental treatments (p <0.05). The results of feed conversion ratio showed that there was a significant difference between the experimental treatments in the grower, finisher and total periods (p <0.05(. The results of carcass traits showed that there was a significant difference in live weight, percentage of breast, wing + back of neck and gills between experimental treatments (p <0.05). The highest live weight was observed in treatment 5 containing heat stress conditions + ubiotic, the highest and lowest percentage of breasts was observed in treatment 4 containing control + heat stress conditions Q10 + Vit C. The overall results of the present study showed that coenzyme Q10 and vitamin C increased feed intake and weight gain and ubiotic supplementation improved feed conversion ratio. As a result, it is advisable to add these beneficial additives, especially supplements containing vitamin C and coenzyme Q10, along with ubiotic supplements in broiler breeding.

The aim of this study was to investigate the effects of using different levels of molasses with sodium polystyrene sulfonate on the nutrition of broiler chickens. This experiment was performed on 480 male broiler Ross 308 chicks in two periods of 11-24 days and 25-42 days in a completely randomized design with a 3 × 4 factorial arrangement with 12 treatments including three molasses levels (zero, 7.5 And 15% of diet) and four levels of sodium polystyrene sulfonate resin (zero, 0.5, 1 and 1.5 g / kg body weight) with four replications and 10 chickens per replication. In 11-24 days, the treatment with 15% molasses compared to treatments with 7.5% and no molasses had a significant increase in body weight and feed consumption (P<0.05) But no significant difference was observed in 25-42 days and the whole experimental period. There was no significant difference between treatments in feed conversion ratio. The effect of different levels of sodium polystyrene sulfonate on performance was not significant. The effect of molasses and sodium polystyrene sulfonate levels on pure carcass percentage, breast percentage and thigh percentage was not significant. In examining the effects of treatments on liver weight percentage, pancreas weight percentage, gizzard weight percentage, heart weight percentage, intestine weight percentage, small intestine weight percentage, small intestine length, small intestine weight percentage to gizzard weight and abdominal fat percentage, there was no significant difference observed between the treatments. In study of different levels of molasses effect on waste moisture, The treatment containing 15% molasses had the highest amount of waste moisture compared to the treatments containing 7.5% and without molasses (P<0.05). The level of one gram per kilogram of body weight of sodium polystyrene sulfonate compared to other levels had the greatest effect on reducing the moisture content of waste (P<0.05). According to the results, addition of different levels of sodium polystyrene sulfonate had no effect on other items examined in this experiment, except for the reduction of waste moisture. In this experiment, the recommendable level of sodium polystyrene sulfonate, one gram per kilogram of body weight, determined in terms of waste moisture.

The purpose of this study was to evaluate the effects of Quinoa Seed bioactive peptides (QSBP) on performance, some blood parameters and immune system in broiler chicks. A total of 240 one-day-old Ross 308 broiler male chicks were randomly allocated to 4 dietary treatments with 4 replicates of 15 birds each. Birds were fed on basal diets (Control) or basal diets supplemented with 50, 100 and 150 mg Quinoa Seed bioactive peptides for 42 d of age. At the end of each week, the weight of mortality, feed intake and the weight of chickens in each replicate were measured then the feed conversion ratio was calculated, Finally, carcass charactristics and blood parameters were evaluated. Results showed that experimental diets had a significant effect on feed intake during finisher and total periods in compared with the control group. Highest feed intake observed in birds that received basal diet supplemented with 150 mg Quinoa Seed bioactive peptides per Kg . Also ,broilers received 150 mg QSBP /kg of diet have significantly higher body weight gain and better feed conversion ratio than the other experimental groups (P<0.05). Also ,broilers received 150 mg QSBP /kg to diet have significantly higher body weight gain and better feed conversion ratio than the other experimental groups (P<0.05)Experimental treatments did not impact serum concentrations of cholesterol, triglyceride, LDL and HDL in chicks, but serum concentrations of Albumine was higher in broiler chickens which received all experimental diets compared with control (P<0.05). Heterophil and lymphocyte and antibody titres were not affected by the experimental treatments. However, the highest relative weight of spleen observed in broilers which received 150 mg QSBP /kg. It can be concluded that QSBP may improved growth performance, immunity and nutrient digestibility in broiler chickens.

The effects of different feed additives as antibiotic replacement on the growth performance, immune response, tibia characteristics and meat quality of broilers were investigated. In this experiment, 540 one-day-old male broiler chickens of Ross 308 strain were randomly distributed into 6 treatments with 6 replicates per each. The experimental treatments were 1) a control group (corn-soybean meal diet), 2) control group + 0.25 g/kg antibiotic as growth promoter (Lincomycin), 3) control group + 1 g/kg herbal extract (contains garlic, thyme, turmeric, lemon balm), 4) control group + 3 g/kg medium chain fatty acids (contains a mixture of caproic, caprylic, capric, and lauric acids), 5) control group + a mix of 1.5 g/kg prebiotic (MHF-Y) and 0.2 g probiotic (Lactofeed) and 6) 1 ml/L essential oils in drinking water (contains ferula gummosa, eucalyptus, clove, peppermint, thyme, fennel, ajwain and satureja). Feed conversion ratio and body weight gain were improved in broilers which received feed additives compared to control group throughout the experiment. Hetrophil and lymphocyte and antibody titers, and tibia characteristics were not affected by the experimental treatments. However, the highest relative weight of spleen and total ash of tibia observed in broilers which received medium chain fatty acids. experimental treatments had no effect on the meat quality. It can be concluded that feed additives may improved growth performance and some of the immune and tibia traits in broiler chickens

The purpose of this study was to investigate the effect of dietary biotronic organic supplement and silymarin nanocrystal supplement with and without LPS factor on liver chemical analysis, histology and immune-cell changes and blood parameters of broiler chicks.This experiment was conducted in2×4 factorial arrangementwith completely randomized design using 192 day old male broiler chicks in 8 treatments, 4 replications and 12 chicks per each replicate.The factors of interest included LPS in two levels of (with and without LPS) and silymarin nano-crystal, biotronic organic supplement factor in 4 levels including (zero, biotronicorganic supplement, nano-crystal sily marin, and biotronic organic supplement complementary nano-crystal silymarin The results showed that the use of organic biotronic and silymarin nanocrystalline supplements and their mix significantly reduced the ALT, AST and percentage of mitotic liver lesions (P<0.05). Application of nano-crystal silymarin and organic biotronic supplement had significant effect on hepatic factors such as hepatocyte count, hepatocyte diameter and sinusoid size but had no significant effect on hepatocyte nucleus diameter.LPS also significantly altered blood parameters and cellular enzymes (P<0.05). Biotronic and nano-crystal silymarin supplementand their mix significantly improved the changes (P<0.05). The results of this study showed that the using of organic biotronic supplement and silimarin nano-crystal, and especially their mix, improved the performance of liver and chemical and cellular enzymes and liver blood parameters.

The aim of this study was to evaluate the effects of in-ovo injection of oil-extracted propolis on hatchery performance, blood cell count and carcass characteristics of broiler chicks. For this purpose, on the 15th day of incubation, 324 Ross 308 broiler chicken eggs were weighed and completely randomized to six experimental groups with three replicates and each replicate containing 18 eggs and injected into amniotic fluid. Experimental treatments consisted of two types of negative control without injection, positive injection of 60 mL distilled water and injection of 4 levels (150, 300, 600 &1200 ppm) from oil-extracted propolis to amniotic sac. The results showed in-ovo injection of oil-extracted propolis on day 15 of incubation did not show any effect on hatching percentage, hatching weight and the ratio of the weight of hatching chicks to egg weight. While 1200 ppm of in-ovo injection of oil-extracted propolis increased the ratio of the weight of hatching chicks to egg weight compared to control group. In-ovo injection of oil-extracted propolis at different levels could not affect the concentration of total white blood cell, heterophile, lymphocyte, monocyte and eosinophil blood in broiler chicks. The carcass weight, heart rate, spleen and tissue stockings were not affected by in-ovo injection of oil-extracted propolis at 42 days of age. So, these results of this study suggest that in-ovo of oil-extracted propolis cannot improve the status of hatching percentage, blood cell count and carcass characteristics of broiler chicks.

On day 16 of incubation 600 Ross 308 breeder fertile eggs were distributed into 5 treatments with 4 replicate and 30 eggs per replicate in a randomized complete block design. Experimental groups were, 1) Non- injected (control), 2) in ovo injection of 0.9% sodium chloride solution, 3) in ovo injection of 0.5% glutamine glutamine in 0.9% saline solution 4) in ovo injection of 1% glutamine in 0.9% saline solution and 5) non-injected group used for feeding a diet containing 1% glutamine during rearing period. At day 18 of incubation one ml of in ovo solution were injected into amniotic fluid of eggs and control group and 1% glutamine group (diet) remained non-injected but treated such as injected groups. Upon hatch, chicks were weighed and transferred to experimental house and reared for 42 days. At day 3 post-hatch, intestine samples were taken for morphology measurement. Antibody response against SRBC (sheep red blood cells) was measured in the 21 and 28 day. Comparing to control, in ovo injection of glutamine 0.5% increased hatchling weight significantly (P<0.05). In ovo injection of solutions had no significant effect on hatchability. in ovo administration of glutamine had no significant effects on feed intake and feed conversion ratio. Carcass traits, bursa of fabricius weight was higher in 0.5% glutamine injection groups, although the difference was not significant. In the current study, In ovo administration and dietary supplementation of glutamine had no significant effects on post-hatch performance, small intestine morphology and anti-SRBC immune response of broiler chicks.