فهرست مطالب behnam ahmadipour gounaghani

The purpose of this study was to investigate the effect of probiotics, prebiotics and their mixture on growth performance, blood-serum parameters, microbial population and intestinal morphology of turkey poults.In this experiment, 96 pieces of hybrid meat turkey poults from the age of 60 to 120 days were used. The treatments included the control diet, diets containing probiotics, prebiotics and equal proportions of probiotics and prebiotics. Production traits were measured weekly and at the end of the breeding period, blood sampling and slaughtering were done to check blood-serum parameters, microbial population and intestinal morphology. The results indicated a significant effect of experimental treatments on feed consumption and feed conversion ratio in the entire breeding period (P<0.05). The percentage of carcass yield, the ratio of spleen and bursa of Fabricius weight to live weight increased in the additive consuming treatments compared to the control group, and the fat weight of the abdominal area decreased significantly (P<0.05). Triglyceride and blood cholesterol in the treatments using additives decreased and the amount of white blood cells and blood albumin increased significantly (P<0.05). Additives had a positive effect on the parameters of intestinal morphology and the population of Escherichia coli bacteria in the cecum significantly decreased (P<0.05). Based on the findings of this research, it is recommended to use pro and prebiotics alone and together as a supplement in the feed of turkeys.

In this experiment, nano DL-methionine was synthesized from commercial DL-methionine and used in broiler diets to evaluate the effects on growth performance, carcass characteristics, blood parameters and small intestine morphology. A total of 200 one-day-old broilers (Arian) were used in a completely randomized design with five treatments and four 4 replicates of 10 birds for a period of 40 days. Experimental treatments included: 1) a control diet consisted of DL-methionine, 2) a diet included 75% of DLM of the control+2.5% nano-methionine, 3) a diet included 50% of DLM of the control+5% nano-methionine, 4- a diet included 25% of DLM of the control+7.5% nano-methionine, and 5- a diet included 10% nano-methionine. The results showed that replacing DLM with NM caused no significant difference between treatments for live responses, carcass characteristics and activities of alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase. There was no significant difference between treatments for serum uric acid, height and width of villi in duodenum and jejunum. However, groups with 7.5% and 10% NM manifested a significant increase (P < 0.05) in breast weight and villus height and width and its absorptive surface area compared to the control. In conclusion, the use of NM could save up to 90% of DLM requirements.

The objective of the present study was to characterize the growth pattern of morphometric traits of Isfahan native chickens. For conducting this research, 200 (112 males and 88 females) of Isfahan native chickens were reared for 12 weeks. At day 1, each chicken was weighed and marked with color plastic tags attached on the one leg and then weighed weekly. At weeks 3, 6, 9 and 12 morphometric traits such as breast width and length, thigh diameter and length, shank diameter and its length were measured. Flexible growth and fixed point of inflection functions were evaluated for their ability to describe the relationship between morphometric traits and age. Three non-linear growth functions (Gompertz, Logestic and Richards), were used for this purpose. Based on models fitting criteria and statistical parameters, all three models gave a good fit to the data (r2adj≤ 0.90), but the Gompertz function gave the best fit to the data. The results indicated that male broilers had a higher final body size than the females. In general, males had higher asymptotic body size and lower growth rate than females. Females reached to maximum growth rate faster than males and had a lower body size in the inflection point. The correlation between body weight and morphometric traits at week 12 for both sexes were positive and significant (p < 0.05) and the correlation values were moderate to high (0.03<r<0.82). In conclusion, based on the differences in the growth pattern of chicken sexes it advised that in the rearing of