جستجوی مقالات مرتبط با کلیدواژه « ileum » در نشریات گروه « علوم دام »

 The increase in the cost of the diet, especially the protein part, has caused the desire of producer and researchers to use by-products. The use of animal waste not only reduces the cost of feed but also reduces the entry of contaminants into the environment. Hydrolyzed feathers, meat meal, bone meal, poultry by-product meal (PBM) and fish oil are some of the by-products used in poultry, dairy cattle and other livestock diet. Also, the use of pelleted feed in broiler chicken is increasing, because it produces less dust, improves digestibility, reduces transportation costs, and improves performance indicators such as feed consumption and decrease feed conversion ratio. Sodium bentonite (SB) is one of the substances that has been used as pellet binder in feed. Several studies have evaluated the effects of the addition of SB and had beneficial results on pelleting physical properties such as pellet durability index (PDI) and pellet hardness. Addition of active SB as a pellet binder in wheat-soybean meal-based diets has increased the relative electrical energy usage (REEU) and decreased the feed conversion ratio. However, studies on the use of different levels of PBM and SB as a pellet binder in broiler chicken diets are very limited, the aim of the present study was to investigate the effects of pellet binder levels of SB in diets containing different amounts of PBM on performance, carcass traits and blood metabolites of Ross 308 broiler chickens in finisher period.

Treatments were assigned in a completely randomized design based on a factorial arrangement of 3 levels of SB conditioning time (0, 1.5 and 3%) × 3 levels of PBM (0, 5 and 10%). Experimental diets were balanced based on Ross 308 recommendations for finisher period (24-42 d) by using UFFDA software. In the present experiment PBM and pellet binder of SB samples were prepared from MegaFaravar Co., Iran. Ingredients of diets were ground through a 2-mm screen size in a hammer mill. All diets mixed in a double-shaft mixer and transferred to super conditioner with 82◦C for 10s, and then pelleted through a 3-mm die. After pelleting of feed produced, 3 replications of each treatment with 3-minute intervals were sampled from the cooler part of the pellet machine. The PDI, hardness test and REEU related to experimental diets was measured. Also, a total of 360 24-day-old male chicks were individually weighted and allocated to 9 treatments of 4 replicates (10 birds in each replication). Feed intake (FI), average daily gain (ADG) and feed conversion ratio (FCR) were recorded. On 42 day, 2 birds per pen were randomly euthanized by cervical dislocation. Carcass characteristics and relative weight of small intestinal segments were measured. Total protein, glucose, albumin, lipoproteins (HDL, LDL) were determined by using autoanalyzer device and commercial kits.

Addition of 1.5% SB improved and the use of PBM due to its high fat content reduced the quality characteristics of the pellet that due to their strong colloidal properties and giving rise to a thixotropic gelatinous substance. Likewise, different levels of SB as a pellet binder and PBM did not change the ADG and FCR (P <0.05). However, the use of different levels of PBM with and without SB reduced FI (P<0.05). Also, the relative weight of carcass, breast and thigh was not affected by experimental treatments (P <0.05). Abdominal fat increased significantly in the groups receiving PBM (P <0.05). Amino acid imbalances in PBM probably increase deamination and conversion of amino acids to fat. Significant reduction in duodenum and ileum length was observed in the group containing 3% SB and 10% PBM (P <0.05). Also, the level of 10% PBM with and without SB increased the concentration of blood lipids. Blood lipids concentration have a positive correlation with weight and feed as an environmental factor affects its amount.

In general, the results of this experiment showed that application of PBM as a source of protein with adequate nutritional value up to 5% without negative effects on performance for use in pelleted diet of broilers at high levels when soybean meal is expensive and or not available, it is possible and useable. Also, commercial sodium bentonite can be used as a pellet binder to increase the quality of pellets up to 1.5%. The need for further studies on the simultaneous use of sodium bentonite as a pellet binder and PBM are recommended to ensure the results obtained in other broiler chicken breeding periods.

Effect of probiotic Bioplas 2B was tested on morphologic and cecal microbial populations in quails. Experimental treatments included control; 30 mg/kg antibiotic; 0.1% probiotic; 0.05% probiotic. 320 one-day quail with four experimental treatments in four replications were used in a completely randomized design. The best feed conversion ratio (FCR) was observed in quails fed with 0.05% probiotic and the worst FCR was obtained in quails of the control group which had a significant difference compared with other treatments (P<0.05). There was a significant difference in duodenal villi length (P<0.05). The highest values of crypt depth and thickness in fed birds were 0.1% probiotics, which, in contrast to 0.05% probiotic treatment, were significantly different from other treatments (P <0.05). The lowest depth and thickness of the crypt was also observed in the antibiotic treatment. The results of jejunal morphology showed that the use of probiotic treatment improved the vili length, villi thickness, crypt depth and crypt thickness compared to the control and antibiotic treatments (P<0.05). The probiotic treatment also improved the length of the villi and thickness compared to the control treatment. The probiotic treatment also improved the crypt depth and the thickness of the ileum fraction compared to the antibiotic treatment (P<0.05). In addition, the results of cecal microbial population showed that 0.1% probiotic treatment and control treatment increased Lactobacillus population and E. coli and total bacteria compared to other treatments. The results of the present study showed that probiotic supplementation significantly improved the morphology and microbial conditions of intestine in quails and can be a good alternative to antibiotics.

The present study was conducted to determine the effects of olive extract leaf and olive oil on growth performance, nutrient digestibility, carcass characteristics and intestinal morphology in Japanese quail. A total of 528 Japanese quail chicks 1-days-old were allocated to 6 treatments group with 4 replicates each containing 22 birds. This study was performed in a 2×3 factorial experiment with completely randomized design. Experimental treatments were included two levels of olive leaf extract (0, and 400 mg/kg) and three levels of olive oil (0, 2.5 and 5%). The results was revealed that the average daily weight gain were significantly increased in diet containing 5 % of olive oil compared to control group (P<0.05). The diet containing 2.5 percent olive oil decreased average daily feed intake as compare to control diet (P<0.05). The ileum  histomorphometry showed that crypt depth and height villus to crypt depth ratio in birds received 2.5 and 5% olive oil decreased and increased compared with control group, respectively (P<0.05). The results showed that the apparent digestibility of protein, ash, fat, phosphorus and energy in the control group was significantly lower than other treatments (P<0.05). The apparent digestibility of fiber was higher in the treatment containing 5% olive oil and the treatment containing 400 mg/kg diet of olive leaf extract (P <0.05). Diet containing 5% olive oil had the highest metabolizable energy compared to the other experimental groups (P <0.05). In conclusion, the findings of this study suggests that dietary inclusion of olive oil up to 5 percent had benefit effects on quail production indices.

This experiment was conducted to compare the effect of some poultry probiotics produced in Iran on performance parameters, economic indicators and small intestinal morphology of broilers using 500 one-day-old Ross 308 broilers in a completely randomized design with 5 treatments and 5 replicates per each treatment. The experimental treatments were: 1- basal diet (control), 2- basal diet + Bacto-Gene® probiotic, 3- basal diet + Di-Pro® probiotic, 4- basal diet + Hypro-Tect® probiotic and 5- basal diet + Probitaz® probiotic. At 24 and 41 days of age, one male broiler chick was slaughtered from each experimental unit. Orthogonal contrasts were done to compare the effect of probiotics versus control. The results of this study showed that the treatments containing probiotic had no significant effect on body weight gain and feed conversion ratio. The utilization of probiotic Hypro-Tect® resulted in significant reduction in feed consumption in whole experimental period compare to other treatments containing probiotic (P≤0.05). The final body weight, European efficiency factor, economic indices and carcass percentage were not affected by experimental treatments. The utilization of probiotics had no significant effect on intestinal relative length and morphological indices of jejunum and ileum. In orthogonal contrast, the utilization of treatments containing probiotic increased feed cost as compared to control group (P<0.05). According to the results of this study, it seems that the utilization of studied probiotics had no significant effect on performance parameters, economic indices and small intestinal morphology of broilers reared in optimal condition as compared to control group.

This study was carried out to investigate the effects of Humulus lupulus essential oils as an alternative to antibiotic and antioxidant on productive performance, lipids stability of meat and ileum microbial population in broiler chickens during days 1 to 42 of age. A total of 625 day-old Arian broiler chicks were used in a completely randomized design with five treatments (200 and 400 mg/kg Humulus lupulusessential oils, 100 mg/kg antibiotic avilamycin, 150 mg/kg protexin probiotic and control) and five replicates of 25 birds each. Broilers that were fed dietary Humulus lupulus oil at level of 400 mg/kg and antibiotic revealed higher feed intake than broilers fed dietary Humulus lupulusoil at level of 200 mg/kg (P