[Effect of different levels of oil-extracted propolis on immune system of broiler chicks against newcastle virus]

Biosecurity in the production of broiler chickens is very important but it is hard or even impossible to maintain; hence, promotion of immune responses could control diseases in chickens. At present study, the effect of six levels of oil-extracted propolis [0, 50, 100, 150, 200 and 250 mg/kg ration] on immune system against Newcastle virus was studied using a completely randomized design with 360 chickens. Blood antibody ratio against the Newcastle virus [HI test], the weight of thymus, bursa fabricius and the percentage of lymphocytes were measured for a period of 42 days and the data were analyzed. The results indicated that the rate of antibody has significantly [p<0.05] increased with an increase in the amount of propolis in diets and with the levels of 250 mg/kg ration the antibody rose to 10.42 titre at the age of 42 compare to control [6.42]. The weight of thymus gland also increased significantly [p<0.05] with the increase in the levels of propolis and at the levels of 250 mg/kg in ration, weight of thymus increased up to 14.54g in compared to control [8.47 g]. Similarly the weight of bursa fabricius significantly increased [p<0.05] from 2.42 g in contral to 4.62 g in 250 mg propolis/kg of ration [p<0.05]. Intake of 200 and 250 mg propolis/kg of ration has significantly increased the lymphocytes to the levels of 50.18 and 51.25 percent compared to the control [48.93%], respectively. Results indicate that the efficiency of immune-system for immunizing of broiler chickens against Newcastle virus has been promoted using 50 up to 250 mg of propolis per kg of ration

[Effect of terbutaline on performance and some blood biochemical parameters of broiler chicks]

To study the effects of different levels of beta-adrenergic agonists on performance and some blood biochemical parameters of male and female broiler chicks. Factorial study [5treatment x 2 sexes] as completely randomized design. Three hundred Cobb male and female broiler chicks. Twenty one day old chickens were fed with 0, 5, 10, 15 and 20 mg terbutaline/kg of diet for 3 weeks. After then, performance[Feed intake, body weight gain and feed conversion ratio], weight of whole body and carcass of chicks and the concentration of serum glucose [GLC], cholesterol [TC], triglycerides [TG], creatine kinase [CK], glutamic oxaloacetic transferase [GOT] and blood urea nitrogen [BUN] of chicks were determined at the end of experiment. Analysis of Variance of the data and Duncan's multiple range tests. While different levels of terbutaline had not any effect on the body weight gain of chicks, feed conversion ratio of the roosters reduced in response to 5 and 10 mg terbutaline /kg the highest weight of the whole body and carracas of male and female chiks were seen with mg terbutaline kg of diet. Increased dietary level of terbutaline made increase in the concentration of GLC. The highest concentration of blood TC and TG were seen by 10 mg terbutaline. Different levels of terbutaline had not any effect on the concentration of CK, GOT and BUN. Results showed that 5 mg terbutaline /kg in grower diet made increase in whole body and carcass weight of male and female broiler chicks. Furthermore, it improved the feed conversion ratio in roosters

[Effects of rapeseed meal and iodine supplement on broiler chicks]

To study the effects of rapeseed meal and iodine supplementation on performance, organs weight and some biochemical parameters of broiler chicks. Completely randomized design with 3 dietary treatments. One hundred and twenty one-day-old Arian broiler chicks [mixed male and female]. Chickens were categorized into 3 groups: soybean meal, rapeseed meal, and rapeseed meal plus iodine [2mg/kg]. feed intake, body weight gain and feed conversion ratio were determined at the end of starter, grower, finisher and whole priod states Moreover, the values of relative weight of liver, gallbladder, heart, spleen, gizzard, abdominal fat pad and carcass accompaning with serum concentrations of triiodothyronine, thyroxine, gamma glutamyltransferase and alanin aminotransferase were determined at 49 day of age. Significant differences among treatments determined by Duncan's multiple range tests. While rapeseed meal [RSM] reduced, body weight gain and feed conversion ratio, iodine supplement did not affect body weight gain and feed conversion ratio during starter, grower and whole period states. In contrast to iodine treatment the highest weight of gallbladder and its ratio to whole body weight were seen with RSM. The weight of abdominal fat pad and its ratio to whole body weight were reduced in RSM and RSM puls iodine supplementation. Iodine Supplementation had effect on the concentration of thyroxine, triiodothyronine gamm glutamyltransferase and alanin aminotransferase in RSM group. The complete replacement of rapeseed meal with soybean reduced performance and concentration of triiodothyronine hormone, and increased some organs weight, idoine supplementation had no effect on erfrmanc