فهرست مطالب mohammad yeganeparast

In the management of camel breeding, weightlifting plays a decisive role in grouping livestock, regulating nutritional needs and also annual evaluation of animals. Due to the many difficulties and risks, camel owners usually prefer alternative methods such as using apparent estimates or weight -meter to estimate the weight of camels. Since the accuracy of mathematical models in estimating the weight of camels is not equal, so the present research was conducted to compare the accuracy of estimating artificial neural network and multiple linear regression model in estimating the weight of dromedary camels from their body dimensions. For this purpose, 26 camels with 203 records were used from a private farm for one year. Weighing and determining the body dimensions of camels (body length, shoulder height, back height, hump height to the ground, chest and abdomen girth) were measured monthly. To estimate the weight of camels from their body dimensions, the data were analyzed using multiple linear regression model and artificial neural network. The weight of camels on their body dimensions was estimated with accuracy of 0.94 and 0.99, respectively, using multivariate linear regression model and artificial neural network model. The weight of camels on their body dimensions was estimated with accuracy of 0.94 and 0.99, respectively, using multivariate linear regression model and artificial neural network model. The results of this research showed that the artificial neural network has the proper ability to estimate the weight of camels based on their body dimensions and can replace conventional regression methods.

This study was conducted to investigate the effect of adding 0, 10 and 15% levels of wheat straw and the use or non-use of Lactobacillus buchneri microbial additive on the quality of fodder beet silage (FBS) in polyethylene bags in a 3×2 factorial statistical design. For each treatment, 4 bags and a total of 24 bags of 25 kg of fodder beet silage with different composition were prepared and transferred to storage at room temperature and after 75 days, all bags were opened and their pH, temperature and silage quality were immediately determined. A sample of each bag was used for chemical laboratory evaluation including DM, CP, Ash, NDF, ADF and ammonia nitrogen (AN). The results showed that adding 10 and 15% levels of wheat straw improved silage quality and reduced pH compared to the control (P<0.01). Addition of wheat straw had a significant effect on chemical composition and silage stability (temperature and pH) during opening (P<0.01), Addition of wheat straw reduced watery loss and increased silage quality (P<0.01). In general, the most suitable mixture of the silage was control + 15% wheat straw, which had a higher quality and longer shelf life.

This study was carried out to investigate the effects of Savory essential oil and Flavomycin on performance, some carcass traits, immune response and hematology of broiler chickens. In this research, four houndered Ross 308 male chicks were used in a completely randomized design with 5 treatments and 4 replicates and 20 broiler chicks per experimental unit. Experimental treatments consisted of control group (without any additive in diet), diet containing 0.6% of flavomycin, and dietes containing 200, 400 and 600 mg savory essential oil per Kg diet, respectively. The results showed that the addition of savory essential oil significantly improved feed intake and feed conversion ratio in comparison with flavomycin in first and fifth weeks of age and in the first week significantly improved weight gain compared with the negative control group (p<0.05). The effect of savory essential oil and flavomycin on body weight gain and feed conversion ratio in broiler chicks was not significant in the whole period. There was a significant difference between the experimental groups in terms of water intake during the whole period of breeding, and in this regard, chicks fed 400 ppm of savory essential oil had the least water intake (p<0.05). Consumption of savory essential oil and flavomycin had no significant effect on carcass traits, blood parameters, immunity statue and quality of breast meat of broiler chicks (p>0.05). Based on the results of this study, savory essential oil and flavomycin had not positive impact on productive performance, immune response and carcass quality in broiler chicks.