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

To investigate the effects of using fennel root powder in the diet on the productive performance, immune responses, and meat quality of Arian broiler day-old chicks, an experiment was carried out in a completely randomized design with six treatments, four replicates and 20 (male and female) in each, for 42 days. The experimental groups include: 1- basic diet (control) 2- basic diet + 2 g/kg fennel root powder 3- basic diet + 4 g/kg fennel root powder 4- basic diet + 6 g/kg fennel root powder 5- basic diet + 250 mg/kg antibiotic and 6- basic diet + 200 mg/kg probiotic. The live weight , livability percentage , the production index and carcass characteristics were not affected by the experimental treatments during the whole period. In contrast, the average feed consumption in the whole period was affected by the treatments containing fennel and antibiotics (P<0.05). The antibodies against sheep red blood cells (SRBC) and immunoglobulin G were higher in the treatments using fennel root powder compared to the control treatment (P<0.05). The use of fennel root powder at all levels, reduced MDA after seven days of keeping meat in the refrigerator at 4 degrees Celsius (P<0.05). In conclution, regarding the positive effects of using fennel root powder on the immune responses and meat preservation of broilers, it is recommended to use it at the rate of 2 grams per kilogram of diets.

An experiment was conducted to determine the optimal dietary level of wheat middlings for Arian commercial strain broilers. One thousand and fifty hundred Arian broiler chickens (a mixture of two sexes) were reared from 5 to 49 days old in a completely randomized design with 5 treatments, 10 replicates and 30 birds in each replicate. Experimental treatments included zero (control), 12.5, 25, 37.5 and 50% levels of wheat middlings in the diet. Wheat middlings reduced the feed cost per kilogram of live weight of broilers at 49 days of age; these reductions at levels of 37.5 and 50% were about 9 and 11%, respectively, and were significant compared to the control. The multi-attribute decision making (MADM) method was applied to determine the optimal level of wheat middlings in the diet. Based on the scoring obtained from this method, the group of birds receiving 37.5% of wheat middlings gained the highest score (72.92) and the groups receiving 25, 50, 12.5 and 0% wheat middlings were in the next ranks (72.58, 72.52, 63.98 and 17.41), respectively. In the end, the optimal level of dietary wheat middlings inclusion to achieve the highest management score obtained by the MADM method was determined to be 34.7%.

In the current study, the humoral immune responses (the titers of total antibody, immunoglobulin Y and immunoglobulin M) and plasma protein concentrations (total protein, albumin, globulin and the ratio of albumin to globulin) measured at 22 and 50 weeks of age on 49 high-productive Arian broiler line and 79 native fowls were compared. All traits were analyzed with a three-way ANOVA model with interactions, fitting two strains (Arian and native), two sexes (male and female) and two different ages (22 and 50 weeks of age). Total antibody titer and immunoglobulin Y titer in native strain, females and the birds at age of 22 weeks were significantly higher than the Arian strain, males and birds at age of 50 weeks, respectively. Total plasma protein, albumin and globulin concentrations in Arian strain and age of 50 weeks were higher than native strain and age of 22 weeks, respectively. In both strains, the concentrations of albumin were higher in hens. Except for the age effect, the ratio of albumin to globulin in native strain and in females was higher than Arian strain and males, respectively. This ratio was the lowest in Arian roosters. For the interaction among main effects, the lowest immune responses of total antibodies and immunoglobulin Y was observed for Arian roosters, age of 50 weeks for both strains and age of 50 weeks of both sexes. For these effects, no similar pattern was observed for the immunoglobulin M. In general, the results of the present study indicated that the male and female native birds have higher humoral immune responses comparing to Arian roosters, when they are kept under the same condition. Therefore, it is possible to produce more resistant chickens through mating native rooster with Arian hens.