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Articles by A. Zare Shahneh
Total Records ( 4 ) for A. Zare Shahneh
  R. Taherkhani , M. Shivazad , M. Zaghari and A. Zare Shahneh
  A chick bioassay with chemically defined amino acid (AA) diets was conducted to compare four different AA profiles: the NRC (1994), Feedstuff, Rhone Poulenc Animal Nutrition (RPAN) and Illinois Ideal Chick Protein (IICP) AA profiles. The ideal ratios of IICP, RPAN and Feedstuff calculated using digestible AA requirements and total AA requirements used for NRC. This battery study involved male and female chicks during 7 to 21 days of age. Indispensable AA were rationed to lysine according to requirement ratios presented in the four profiles. Digestible lysine set at 1.07 and 0.98 % of diet for male and female, respectively. All diets were kept isonitrogenous (2.6 % N) by varying levels of L-glutamic acid. All diets were checked to have at least 0.3 % proline and 0.6 % glycine. Diets for all profiles contained 3200 kcal ME/kg and a positive control diet was used according to NRC (1994) recommendations. Chicks fed a common corn-soybean meal diet for 160 h and were raised in the floor pen. Then chicks weighed individually and allocated to battery pens so that most uniformity among pens occurs. Four battery pens of five chicks were fed one of four different profiles or positive control diet in both sexes. Weight gain and feed intake were measured for each pen at day 21 and then feed:gain was calculated. Results indicate that chicks fed positive control diet weighed more (p< 0.5). Among semi purified diets chicks fed diets formulated with NRC (1994) ideal AA ratios had significantly (P< 0.5) better weight gain and feed:gain in both sexes relative to IICP and RPAN, but not to Feedstuff .RPAN had worst weight gain and feed:gain in females . Results of this experiment suggest that new ideal ratio of threonine (relative to lysine) in IICP for starter period may be under-estimated.
  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.
  A.R. Mohammadi , M.A. Abbasi , A.A. Moghaddam and A. Zare Shahneh
  In order to estimating body weight at different ages and pre and post average daily gain of Afshari sheep breed, the collected records by Jahad-e-Keshavarzi organization during 1994-2005 were used. Data were entered to excel and prepared for analysis by linear models using SPSS packages. Comparison of traits mean at different levels of fixed effects were done by Duncan procedure. The averages of Birth Weight (BW), Weaning Weight (WW) and body weight at 6th month of the ages (SW) were 3.26±0.072, 22.02±0.410 and 31.94±0.629 kg, respectively. The Average Daily Gain from birth to weaning (ADG1) and weaning to 6th month of the ages (ADG2) were also estimated 184.04±5.02 and 156.84±11.81 g, respectively. Effect of sex, birth type, birth years, birth months and flocks on BW were significant (p<0.01). Effect of sex, birth type, weighting year, weighting month and flocks on WW, SW and ADG1 were also significant (p<0.01). Effect of sex, weighting year, weighting month and flocks on ADG2 were significant (p<0.01), but the birth type did not change ADG2 significantly.
  A. Zare Shahneh , Z. Mohammadi , H. Fazeli , M. Moradi Shahre Babak and E. Dirandeh
  Ovarian functional disorders are reported as an important cause of infertility in dairy cattle. This experiment was carried out to determine the effects of GnRH injection at the time of insemination on ovulation rate, conception rate and plasma progesterone concentrations on day 5 post AI. Egithy cows were randomly assigned into 2 experimental groups: Treatment group (n = 40) which received 15 ug of GnRH and control group (n = 40) without any hormonal treatment. Cows were palpated per rectum to ascertain the occurrence of ovulation 24 h post AI. Blood samples were drawn on the day of insemination and on the day 5 post AI. Plasma concentrations of P4 were measured by RIA and analyzed by means of the GLM procedure of the SAS. Differences between the two experimental groups were analyzed by one way ANOVA. Ovulation rate and conception rate were analyzed by means of Binary Models of the SPSS. Results of this study indicated that the injection of GnRH increased the ovulation rate insignificantly (65% vs 47.5%, p>0.05) and increased conception rate significantly (55% vs 25%, p<0.03). GnRH administration caused an insignificant increase in the concentration of plasma progesterone on day 5 post AI (6.03 vs 5.27 ng mL-1, p<0.02). In general results of this study indicate that GnRH injection at the time of artificial insemination improves ovulation and pregnancy rates.
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