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Articles by S. Zerehdaran
Total Records ( 6 ) for S. Zerehdaran
  B. Parizadian , M. Shams Shargh and S. Zerehdaran
  Effects of various levels of energy and L-carnitine on meat quality and serum lipids of Japanese quail were examined. This experiment was carried out using 480 quails in a completely randomized design with two levels of energy (2900 and 3100 kcal kg-1) and three levels of L-carnitine (0, 250 and 500 mg kg-1) by factorial arrangement. Four replicates with 20 quails were allocated to each experimental treatment and birds were reared for 42 days. At the end of the experiment, two birds from each experimental unit were selected and after slaughter and separation of carcasses, thigh and breast samples were transferred to the freezer to asses meat quality parameters. The results showed that using of higher levels of energy increased the amount of blood cholesterol and triglyceride (p<0.05). The quails were fed with ration containing L-carnitine supplementation, had lower triglyceride in comparison with control group (p<0.05). Higher levels of energy increased the amount of crude fat and malonaldehyde in breast samples. The amount of malonaldehyde in breast samples after storage for 90 days and amount of crude fat and malonaldehyde in thigh samples after storage for 30 and 90 days were affected by different levels of L-carnitine, so that using of 250 mg kg-1 L-carnitine significantly reduced the amount of malonaldehyde in breast samples and crude fat and malonaldehyde in thigh samples (p<0.05). Therefore, it can be concluded that the supplementation of diet with L-carnitine has positive effects on blood triglyceride and meat quality in Japanese quail.
  H. Mohebodini , B. Dastar , M. Shams Sharg and S. Zerehdaran
  The present study was conducted to compare the effect of early feed restriction and meal feeding on performance, carcass characteristics and blood constituents of male broilers. Birds fed ad libitum for the 1st week post hatch. Feed restriction schedule was applied from 7-14 or 7-21 days of age. Chickens in treatment 1 fed ad libitum (AL) throughout the experiment. Birds in treatment 2 and 3 were subjected to Quantitative Feed Restriction based on Maintenance (QFRM) or 50% of Growth (QFRG) energy requirements. Birds in treatment 4 and 5 were subjected to quantitative feed restriction based on a meal feed schedule from 7-14 (MF 14) or 7-21 (MF 21) days of age. Five replicate groups of 12 broilers were allocated to each treatment. Results indicated that feed restriction reduced weight gain compared to AL or MF regimes (p<0.05) at the end of experiment. Broilers subjected to feed restriction regimes consumed less feed than either AL or MF (p<0.05). There were no significant differences between MF and AL groups for weight gain and feed intake. At the end of experiment, feed conversion was improved for birds in MF 14. The carcass weight of the control group significantly was higher than feed restricted groups, but was not statistically different from MF groups. Abdominal fat weight was not affected by feeding regimes. Blood constituents, such as triacylglycerol, cholesterol and LDH were affected by feeding regimes (p<0.05). The results of present experiment indicated that quantitative feed restriction from 7-14 days of age resulted to decrease performance and carcass weight in broiler chickens. Meal feeding from 7-14 or 7-21 days of age had no negative effect on the performance and carcass weights of broiler chickens. Lactate dehydrogenase activity was reduced in feed restriction and MF 21 broilers compare to AL broilers.
  M. Falaki , M. Shams Shargh , B. Dastar , S. Zerehdaran and M. Khomairi
  Effects of a probiotic (PRIMALAC) and a prebiotic (FERMACTO) on performance, ileum and crop microbial flora and carcass characteristics have been examined on 480 1 day old Ross 308 broiler chicks. The experiment carried out in a factorial design including three levels of FERMACTO (0, 1 and 2 g ton-1) and two level of Perimalac (0 and 900 g ton-1). Each of treatment was allocated to 5 replicates of 16 male broilers and reared for 42 days. The microflora population in crop and ileum parts was measured on appropriate bacteriological media. Results of experiment indicated that application of primalc (900 g ton-1) significantly improved body weight gain and feed conversion ratio (p<0.01). Feed consumption and feed conversation ratio were not affected with supplementation of different levels of FERMACTO. The percent of carcass, thigh, breast and abdominal fat were not affected by treatments. Coliform counts in the ileum of birds receiving PRIMALAC (900 g ton-1) and FERMACTO (2000 g ton-1) were significantly lower than those of the control birds (p<0.05). Different levels of PRIMALAC or FERMACTO had no effect on total bacteria counts in the ileum and crop parts. In 3rd week of rearing periods, the highest significant (p>0.05) value of lactobacilli population was recorded for broilers fed diet supplemented with PRIMALAC (900 g ton-1) but different levels of FERMACTO relatively increased lactic acid bacteria population in crop. The results of present study revealed that these feed additive by acting on microbial population of digestive system significantly (p<0.05) affects broiler performance.
  M. Falaki , M. Shams Shargh , B. Dastar , S. Zerehdaran and M. Khomairi
  Effects of a probiotic (PRIMALAC) and a prebiotic (FERMACTO) on performance, ileum and crop microbial flora and carcass characteristics have been examined on 480, 1 day old Ross 308 broiler chicks. The experiment carried out in a factorial design including three levels of FERMACTO (0, 1 and 2 g ton-1) and two level of PRIMALAC (0 and 900 g ton-1). Each of treatment was allocated to 5 replicates of 16 male broilers and reared for 42 days. The microflora population in crop and ileum parts was measured on appropriate bacteriological media. Results of experiment indicated that application of primalc (900 g ton-1) significantly improved body weight gain and feed conversion ratio (p<0.01). Feed consumption and feed conversation ratio were not affected with supplementation of different levels of FERMACTO. The percent of carcass, thigh, breast and abdominal fat were not affected by treatments. Coliform counts in the ileum of birds receiving PRIMALAC (900 g ton-1) and FERMACTO (2000 g ton-1) were significantly lower than those of the control birds (p<0.05). Different levels of PRIMALAC or FERMACTO had no effect on total bacteria counts in the ileum and crop parts. In 3rd week of rearing periods, the highest significant (p>0.05) value of lactobacilli population was recorded for broilers fed diet supplemented with PRIMALAC (900 g ton-1) but different levels of FERMACTO relatively increased lactic acid bacteria population in crop. The results of present study revealed that these feed additive by acting on microbial population of digestive system significantly (p<0.05) affects broiler performance.
  M. Falaki , M. Shams Shargh , B. Dastar and S. Zerehdaran
  An experiment was conducted to evaluate the effects of different levels of probiotic and prebiotic on growth performance and carcass characteristics of broiler chickens. About 480 sexed male Ross 308 hybrid chickens were used. The birds were assigned six treatment groups in a randomized complete block design. Each treatment allocated to 5 replicates of 16 male broilers and reared for 42 days. The broiler chickens were grown on starter (0-21 days) and grower (22-42 days) diets calculated to meet NRC recommendations and supplemented with different levels of probiotic PRIMALAC (0, 900 g ton-1) and prebiotic FERMACTO (0, 1000 and 2000 g ton-1). Body weight and feed consumption were determined weekly during the study. Each dietary was fed ad libitum in the whole of experiment. The result of present study showed that the interaction effect between different levels of PRIMALAC and FERMACTO was significant. The highest value of body weight gain was recorded for broilers fed the diet supplemented with mixed of PRIMALAC (900 g ton-1) and FERMACTO (2000 g ton-1) (p<0.05). Lowest feed conversion ratio was belonging to prebiotic (2000 g ton-1) group and caused more efficient feed intake. The highest significant (p<0.05) value of carcass and breast were recorded for broilers fed diet supplemented with mixing PRIMALAC and FERMACTO. The percent of carcass, thigh and abdominal fat were not affected by treatments. The results of present study revealed that supplemented diets with mixed of PRIMALAC and FERMACTO (symbiotic) as growth promoters appeared to be superior compare to use alone and improve broiler chickens growth indices.
  S. Zerehdaran , S. Hassani , A.M. Gharebash , A. Khanahmadi and F. Farivar
  To illustrate the consequences of including health related traits in a sustainable broiler breeding program, two scenarios were simulated using the SelAction program. In the first scenario (economic), selection was only for production traits and Gait Score (GS) and Heart Failure (HF) were ignored in the breeding goal. In the second scenario (sustainable), GS and HF as well as production traits were included in the breeding goal. Economic values of GS and HF were determined using desired-gain approach to obtain a zero response in GS and HF. The results indicate that, despite improved responses for production traits in the economic scenario, there was an unfavorable reduction in GS of about 0.13 points and an unfavorable increase in HF of about 0.025 points. In the sustainable scenario, the deterioration of GS and HF was stopped. In the economic scenario with zero economic values for GS and HF, the total monetary response was higher (0.104 _) than sustainable scenario (0.097 _). Due to negative correlations between health and production traits, increased emphasis on health traits in the sustainable scenario resulted in a reduction in the total monetary response. In conclusion to stop the increased incidence of diseases, health traits should be included in the breeding goal and assigned appropriate values.
 
 
 
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