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Articles by Fariborz Khajali
Total Records ( 3 ) for Fariborz Khajali
  Fariborz Khajali , M. Faraji and Saeid Karimi Dehkordi
  The effect of using a low protein regime in pullet development and subsequent layer performance was studied. The experiment consisted of two periods of rearing and laying. Two hundred and sixty Hy-line W36 chicks were used. In the rearing period, dietary protein level and ME content series of the control group used during starter (18-42), grower (43-63) and developer (64-119d) phases were 20, 2930, 18, 2930, and 16, 3025, respectively. Dietary protein sequence of the low protein group was 18.5, 16.5, and 14.6% during the respective periods. In the laying period lasted from week18 to week32 of age, CP content of the control and reduced-protein diets were 17.8 and 16.3%, respectively. Reduced-protein diets were kept isoenergetic with their corresponding controls in each period and phase and they balanced to keep the same total sulfur amino acid to lysine ratio as well. Results indicated that birds on reduced-protein diet during starter phase of the rearing period consumed less feed (p = 0.003) and as a result they had significantly (p = 0.012) better feed conversion ratio (FCR) compared to the control. However, dietary protein regime had no significant effect on weight gain, feed intake and FCR during grower and developer phases. In the laying period, there was no significant difference in terms of layer performance and egg quality criteria. In conclusion, reduced-CP diets can be satisfactory used for rearing pullets and laying hens up to 32 weeks of age.
  Fariborz Khajali , Saied Karimi and M.R. Akhari
  One experiment was conducted to evaluate the physiological response and postmolt performance of laying hens subjected to non-feed removal molting programs. One hundred and eighty 78-week-old Hy-line W36 laying hens were distributed among 45 groups of four birds and located in cages so that mean body weight of each cage was very similar. Three adjacent cages were considered as a replicate and 3 such replicates were assigned to each treatment. There were five treatments (molting procedures): Treatment 1 was continuous feed removal (CFR) and considered as the control. Hens on treatment 2 (T2) fed ground corn as sole feed ingredient and dietary vitamin and macro and microelement levels were maintained as Hy-line W36 guideline specifications. Treatment 3 was similar to T2 except that salt was removed from diet. Treatment 4 was similar to T2 except that corn was replaced with wheat. Treatment 5 was similar to treatment 4 except that salt was removed from diet. Birds on T2 to T5 were fed at the rate of 50 g day-1. The results indicated that hens subjected to CFR went out of production by Day 5 while those on corn or wheat diets with or without salt ceased egg production from Day 7 to Day 13. Nevertheless, postmolt egg production did not significantly differed among the treatments. Body weight loss in feed-deprived hens during molt was significantly (p<0.05) greater than non-feed removal treatments when measured on Day 7 and Day 12. Starvation during continuous feed removal resulted in increased heterophil to lymphocyte (H/L) ratio (p<0.05), hematocrit and plasma T4 whereas decreased plasma T3 level (p<0.05).
  Ali Saffar and Fariborz Khajali
  Problem statement: Ascites is a common rapid-growth-related problem in broiler chickens grown at high altitude where the partial pressure of oxygen is low and is marginally adequate to support the growth performance and ascites-related variables. A mismatch between the growth of oxygen supplying organs and the oxygen demanding organs causes ascites in broiler chickens. In the present study, broilers were subjected to two types of feed restriction with or without probiotics and changes in the growth rate of body organs were attributed to the incidence of ascites. Approach: Four hundred male day-old broiler chicks were randomly assigned in a completely randomized design to five treatments: (1) a control group fed ad libitum throughout the experiment (2) a group subjected to meal feeding during 5-11 days of age with feeding times from 08-12 h and 13-17 h, (3) a group similar to treatment 2 except to received probiotics, (4) a skip-a-day feeding with 24 h fasting on days 9 and 11 and (5) a group similar to treatment 4 except to received probiotics. Probiotics was only used during the feed restriction at 1 g L-1 in the drinking water. Broilers reared on litter flooring from 1-49 days of age. Results: Both feed restriction programs used under conditions of the experiment resulted in poorer performance relative to the full-fed control but retarded growth caught up at the end of experiment. Carcass and breast yield were significantly (p‎<0.05) reduced right after feed restriction but not later on. Heart and liver percentages showed a reverse growth pattern after termination of feed restriction. Feed restriction had no consistent effect on abdominal fat deposition. Broilers subjected to the feed restriction had significantly (p<0.05) lower proportion of right ventricle to total ventricles. Probiotics had no beneficial impact on the compensatory growth though they tended to reduce the mortality from ascites. Conclusion: Early feed restriction did not influence the proportional growth of body organs and had no significant impact on ascites incidence. Probiotics had a positive effect in prevention of ascites.
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