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Articles by Nazem A. Shalaby
Total Records ( 3 ) for Nazem A. Shalaby
  Amr A. Gabr , Nazem A. Shalaby and Mohamed E. Ahmed
  Background and Objective: Generally, the major factors that affect profitability in sheep production are the total number and the total weight of lambs produced per ewe. Therefore, the aim of this study was to determine the effect of born type, growth rate, growth trend of Rahmani ewes as a lamb and the weight at conception on their subsequent productivity. Materials and Methods: The data used in the present study were collected from 1728 Rahmani ewes during the period from 1991-2001.These animals were maintained at El-Serw Experimental Station belonging to Animal Production Research Institute, Ministry of Agriculture, Egypt. The studied traits were number of lambs born per ewe lambing (NLB), number of lambs weaned per ewe lambing (NLW), weight of lambs at birth (WLB) and weight of lambs at weaned (WLW). Results: The ewe from single born affected significantly (p<0.05) the lambs weights of birth and weaning but not the total number of lambs born. The increase of ewes growth rate as a lamb (>100 g day–1) during their rearing period from birth and from weaning to a year of age resulted a significant increase in the total number and weight of lambs born and weaned. Ewes that gained from 80 g day–1 growth rate before their weaning and continued with >100 g day–1 from weaning upto a year of age had the profitable values of all tested parameters for produced lambs. The lambs number, weights of birth and weaning were increased significantly (p<0.05) with advancing weight of their ewes at conception (>50 kg). Conclusion: In summary, the ewes born type, growth rate as a lamb and their weight at conception has detrimental effect on total number and weights of lambs produced.
  Amr A. Gabr , Nazem A. Shalaby and Hesham M. Rahma
  Background and Objective: Early weaning seems to be a feasible practice that could have interesting possibilities from a productive point of view. While, the rabbits during weaning period are sensitive to multifactorial digestive disorders. Therefore, the aim of the study was to evaluate the response of early weaning rabbits at 21 days for 6 days supplementation with a mixture of mentha, cumin extracts and cow milk (MCM), compared with rabbits weaned at 2 and 27 days without supplementation. Materials and Methods: A total of 288 weaned rabbits were used from four breeds (New Zealand White, California, Chinchilla and Rex). Rabbits were divided into three treated groups, each group containing 96 rabbits. The 1st group was kits weaned at 27 days (G27), the 2nd group at 21 days (G21) and the 3rd group at 21 days (GS21) and supplemented for 6 days with a fresh mixture of MCM. At 27 days of age, blood samples were taken form 36 rabbit (12 from each treatment). During the growth period of rabbits’ individual live body weight and feed consumption were recorded weekly and feed conversion efficiency was calculated. At the end of the experiment (70 days of age) 36 male rabbits (12 from each treatment) were slaughtered for carcass traits evaluation and meat analysis. Results: The live body weight and the average daily gain were significantly (p<0.05) improved when 21 days weaned rabbits were supplemented with MCM mixture (GS21), compared with groups G27 and G21. The MCM mixture was more effective without any adverse effect on the blood biochemical changes at 27 days of age. The supplemented group (GS21) showed lower digestive disorders cases. At 70 days of age, the MCM mixture improved some carcass traits and increased crude protein and ash contents in the rabbit meat (GS21). Moreover, group GS21 showed significantly lower feed cost per kilogram weight gain and higher performance index and economic efficiency values. Conclusion: In summary, supplementing with the MCM mixture could improve significantly the early weaned rabbit performance (21 days of age) without any adverse effect.
  Hend A. Radwan and Nazem A. Shalaby
  Background and Objective: Average daily gain trait of lambs at different ages has a very important effect on the profitability of sheep production systems. Developments of effective selecting and breeding programs for genetic optimization the growth rate of the lambs require accurate covariance components and genetic parameters estimates. The aim of this study was to estimate variance, covariance components and genetic parameters for average daily gain traits from birth to weaning (ADG0,3), from weaning to 6 months (ADG3,6) and from birth to 6 months age (ADG0,6) in Rahmani sheep flock maintained at El-Serw Experimental Station, over a period of 10 years (1991-2001), show the effect of the including or excluding maternal components during the genetic evaluation of the traits under study, clarify the most appropriate animal model and rank them according to Akaike Information Criterion (AIC). Materials and Methods: Records of growth traits of 5879 lambs, offspring of 1766 ewes and 299 rams were used in the study. Analysis were carried out by 6 single and multi-trait animal models based on including or excluding to maternal components and locating the most appropriate model for the analysis average pre and post-weaning weight gain traits by determining the akiake information criterion and testing the log likelihood values. Results: Since, the log likelihood of the first and second models were non-significant, which indicates the amount of maternal permanent environmental effect was negligible. Conclusion: It could be concluded that the simple model is the best model in designing of breeding programs for average daily gain traits in Rahmani lambs. A modest rate of genetic improvement could be achieved in the flock through selection. Maternal permanent environmental effects contributed 7 and 29% of the total phenotypic variation in ADG0,3 in single and multi-trait analysis, respectively.
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