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Articles by B. Navidshad
Total Records ( 3 ) for B. Navidshad
  A. Jafari Sayadi , B. Navidshad , A. Abolghasemi , M. Royan and R. Seighalani
  This experiment was conducted to evaluate the effects of withdrawing or reduction mineral premix from diets at 21 to 42 days of age on broiler performance. Two hundred and eighty day old broiler chickens of Cobb 500 strain used in a completely randomized design with 7 treatments, 4 replicates each. Chickens were fed on a common starter diet with suggested mineral premix level (0.5%) for first three weeks age. Seven corn-soybean meal based grower diets with different mineral premix levels were used at 4 to 6 weeks of age. The dietary treatments were the following: T1) 0.5% mineral premix at weeks 4, 5 and 6 T2) 0.5% mineral premix during weeks 4 and 5, and 0.25% at week 6 T3) 0.5% mineral premix during week 4 and 0.25% during weeks 5 and 6 T4) 0.25% mineral premix at weeks 4, 5 and 6 T5) 0.5% mineral premix at weeks 4 and 5 and omitting it during week 6 T6) 0.5% mineral premix during week 4 and removing it during weeks 5 and 6 T7) using diet without mineral premix during weeks 4, 5 and 6. Feed intake and weight gain were measured at the end of each week and feed conversion ratio was calculated. Results showed that reduction or withdrawal of mineral premix from diets in different weeks of grower period, didn`t affect feed intake. In weeks 4 and 5, there was no significant difference in weight gain and feed conversion ratio, but in week 6, weight gain of treatment T1 which fed diet with 0.5% mineral premix at whole the experiment period was significantly higher and its feed conversion ratio was significantly lower than other treatments. The overall results of the present study indicated that it`s possible to reduce or remove dietary mineral premix during at least first 2 weeks of grower period but longer withdrawal can negatively affect weight gain and feed conversion of broiler chickens. This decline in dietary mineral premix maybe causes an increase in cost per kg of produced chickens.
  B. Navidshad , M. Shivazad , A. Zare Shahneh and G. Rahimi
  This experiment carried out to study the effects of dietary fat saturation on performance and serum thyroid hormones of broilers under free or skip a day nutrition at 18-28 days of age. We used 720 male Ross 308 broiler chickens in a completely randomized design with a 2*4 factorial arrangement with 3 replicate and 30 chicks for each replicate. Experiment factors were: 1- skip a day or free feeding at days 10-28 of age and, 2- diets with different unsaturated to saturated fatty acid ratios (2, 3.5, 5 and 6.5) formulated using different levels of sunflower oil and tallow. At 28 and 42 days of age, weight gain and feed consumption recorded and blood samples were taken. SAS software used for Variance analysis and means comparing. Skip a day nutrition at days 18-28 of age significantly reduced feed intake and weight gain and increased feed conversion, But free nutrition at days 29-42 of age removed this differences. At day 28, diet with unsaturated to saturated ratio of 6.5 significantly reduced feed intake and weight gain and increased feed conversion. At day 42 of age dietary fat type didn`t have any significant effect on feed intake and weight gain but altered feed conversion as a manner same to day 28 of age. Skip a day nutrition significantly decreased T3 and increased T4 levels at day 28 of age but this effects were disappeared after re-feeding at day 42 of age. This survey showed that feed restriction didn`t affect bird`s ability to utilize fats with different degrees of saturation. Fat type and feed restriction affect broilers performance separately without any interaction. Dietary fat saturation didn`t have any significant effect on serum thyroid hormones levels, while feed restriction have a pronounce effect.
  M. Nosrati , A. Qutbi , B. Navidshad , Z. Mirhoseini , A. Jafari Sayadi and M. Royan
  This experiment carried out to study the effects of skip a day feeding and different dietary unsaturated to saturated fatty acids ratio on serum cholesterol and triglyceride levels and carcass traits. A total of 720 10-days-old male Ross chicks were fed diets with Unsaturated/saturated fatty acid ratio (U/S) of 2, 3.5, 5 or 6.5 as ad lib or skip a day feeding program during 18-28 days of age. Generally at 28 day of age, chicks body, liver and abdominal fat pad weights and serum triglyceride concentration were significantly (p<0.05) lower and serum cholesterol level were significantly higher in the restricted compared with ad libitum birds. Re-feeding moved out these differences at 42 days of age except for body weight. The serum cholesterol and triglyceride concentrations were decreased (p<0.05) by increased dietary U/S.
 
 
 
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