فهرست مطالب shahabodin gharahveysi

To investigate the effect of using organic chelates of zinc, manganese, and chromium on the performance and microbial population of the caecum of broiler chickens, the present study was conducted. This study was conducted in a completely randomized design by 420-day-old broiler chickens of Ross 308 strain in 7 treatments, 5 repeats, and 15 birds per pen for 42 days. The treatments were 1) organic form of zinc, manganese, and chromium chelate, 2) organic form of zinc and manganese chelate, 3) organic form of zinc and chromium chelate, 4) organic form of manganese and chromium chelate, 5) organic form of manganese chelate, 6) organic form of zinc chelate and, 7) organic form of chromium chelate. Performance traits including feed consumption, body weight gain, and feed conversion ratio were measured. At the end of the experiment, broiler chickens' cecum microflora was collected. Collected data were analyzed by LSmeans procedure in SAS statistical software. The effect of organic chelates on body weight in the initial period and feed conversion ratio in the growth period was significant (p < 0.05). The highest weight gain (176.6 grams) was observed in the treatment containing the organic form of chromium and the lowest weight gain (152.8 grams) was observed in the treatment containing the organic form of zinc. The highest value of feed conversion coefficient (1.1) was observed in the treatment containing the organic form of zinc, manganese, and chromium, and the lowest value (0.1) was observed in the treatment containing the organic form of chromium. The effect of organic chelates on the E. coli population of broiler cecum was significant (p < 0.05). The highest (5.65 LogCFU/g) and the lowest (5.15 LogCFU/g) E. coli bacteria populations were observed in treatments containing organic forms of zinc, manganese, and chromium and organic form of zinc, respectively. Considering the improvement of performance traits and cecum microflora of broiler chickens in this study, the use of organic chelates is recommended.

This research was conducted in order to study the effect of taurine amino acid addition on performance, carcass characteristics, blood factors and liver enzymes in broilers. The experiment was conducted in 45 days in the form of a completely random design with 300 pieces of one-day-old broilers of the Ras strain, including 4 treatments, 5 repetitions and 15 birds in each repetition with the same energy and protein diets with the same rearing conditions. The experimental treatments included: the first treatment (basic diet) and the second, third and fourth treatments respectively: the basic diet along with 1 g/kg taurine amino acid, 3 g/kg taurine amino acid and 6 g/kg taurine amino acid. The results showed that body weight gain, feed consumption and food conversion ratio were significant between the experimental treatments and the control treatment during the breeding period (P0.05). But numerically, a better performance was observed with the addition of taurine supplement to the diet in these enzymes. (P > 0.05). In general, the results of this experiment showed that adding 6 grams/kg of taurine amino acid leads to an improvement in the titer of blood parameters and liver enzymes without negatively affecting the performance and characteristics of the carcass.

This experiment was conducted to survey of growth performance, blood metabolites, immunity, and thigh meat quality of broiler chickens fed with lysophospholipids (LPL) supplement in diets with soybean, flaxseed and sesame oils. This experiment was done in a CRD with a 23 factorial arrangement of treatments including two levels (0 or 0.05%) lysophospholipid (Lipidol) and three different sources of oil including soybean, flaxseed and sesame oils. A total of three hundred of male Ross broiler chickens were randomly allocated into 6 treatments with 5 replicates of 10 birds per each.  This experiment was conducted to investigate the growth performance, blood metabolites, immune system, and thigh meat quality of broilers fed by lysophospholipids (LPL) supplementation in diets with soybean, flaxseed and sesame oils. This experiment was done in a CRD with a 2Í3 factorial arrangement of treatments including two levels of (0 or 0.05%) lysophospholipids (Lipidol) and three different sources of oil including soybean, flaxseed and sesame oils. A total of three hundred of male Ross broilers were randomly allocated into 6 treatments with 5 replicates of 10 birds per each. The results of this experiment showed that the use of sesame oil compared to soybean oil improved body weight gain and feed conversion ratio of broilers (p < 0.05). Broilers which received dietary LPL had a greater weight gain and feed conversion ratio, lower relative weight of bursa and greater triglycerides and LDL compared with those without LPL supplementation (p < 0.05). Use of sesame oil compared to soybean and flaxseed oil diets decreased malonaldehyde and increased water holding capacity of the thigh meat in broilers (p < 0.05). Besides, drip loss factor was lower in broilers which received LPL supplementation (p < 0.05). Based on the results of this experiment, it can be concluded that the use of sesame oil in the broiler diets could improve growth performance and meat quality. In addition, the use of LPL supplementation resulted in an increase of growth performance and alteration in blood metabolites of broiler chickens.

Milk thistle plants including medicinal plants useful that its extract has antioxidant and liver protection. The aim of this study was to investigate the effect of different levels of Milk thistle herb and antibiotics Cotrimoxazole on blood metabolites of Ross broilers. In this experiment, milk thistle herb in three levels 0, 0.3 and 3 percent and antibiotics Cotrimoxazole in two levels 0 and 2 kg with 3 repeat were considered. Blood metabolites were measured at 42 days of age. Metabolites include glucose, cholesterol, prothrombin time (PT), uric acid, creatinine and bilirubin. Data to evaluate the effect of factors under study using the general linear model (GLM) and SAS statistical software were analyzed. Antibiotic cotrimoxazole was a significant effect on blood glucose (p<0.05). Milk thistle effect was a significant on blood cholesterol (p<0.05) and Cotrimoxazole antibiotic effect on blood cholesterol was a very significant (p<0.01). Milk thistle effect on uric acid and creatinine levels was a significant (p<0.05). The different levels of Milk thistle was very significant on bilirubin in the blood (p<0.01). Different between mean of Milk thistle and antibiotic cotrimoxazole for prothrombin time (PT) was significant (p<0.05). Use of the Milk thistle levels reduced the liver problems, because the amounts of liver enzymes secreted in the blood was decreased. Level 3% Milk thistle have maximum protective effect on the liver.

Breeding method and age of broiler breeder herds, are important factors affecting the egg traits and hatchability. The aim of this research was to study the effect of age of broiler breeder herds and farms on the egg quantitative traits and hatchability. An experiment was conducted in a randomized complete block design with three treatments (broiler breeder herd ages) and three blocks (farms). Of any farm, 120 fretilized eggs in three different ages (43, 53 and 60 weeks) were randomly selected. Egg and hatchability traits were measured. For statistical analysis of the traits, the GLM procedure in SAS statistical software was used. For mean comparison of farm and age effects, the Duncan test with 0.05 probability level was used. The effect of farms and broiler breeder ages on all traits were significant (P<0.05). Apart of the egg shell thickness and Haugh units, in other traits an increase in measeurements were observed with increasing age. According to the findings of the study, generally broiler breeder flocks had the best performance at the ages of 53 and 60 weeks.

This research was conducted to study the effects of the milk thistle powder on growth performance, blood parameters and liver enzymes in the 360 male broiler chicks (Ross 308). The studied factors were milk thistle powder at 0, 0.3 and 3% levels and antibiotic Cotrimoxazole at 0 and 0.2% per kg diet, which was a factorial experiment in a completely randomized design with 6 treatments and 3 replications. Growth performance traits, blood parameters and liver enzymes were measured at the end of the experimental period (42-day). The different levels of milk thistle powder caused a decrease in the mean of feed intake and body weight in the whole period (P

The present investigation was undertaken to study reason of culling, non genetic effects and genetic parameters of longevity with two method linear model and Weibull. A data set of information from Holstein dairy cows of Isfahan province (Iran) was used for this study. The culling date of 36340 animals from 65 herds recorded in 1993-2014 was used. From 33219 culled cows in these years were 27.9 and 72.1 percent for voluntary and involuntary culling respectively. Lifespan and Length of productive life (LPL) were analyzed for longevity. Functional productive life (FPL) was estimated by adjusting LPL for first lactation milk yield relative to herd average. The mean of lifespan and length of productive life were estimated to be 954 and 1710 (days) respectively. The results with GLM procedure showed that HYS and age at the first calving had significant on length of productive life. The results with Lifereg procedure with Weibull function showed that effects of herd, year of first calving (p