الفهرس 
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Abstract
This study was carried out at El-Karada Animal Production Research Station, Sakha Animal Production Research Laboratories, Kafr El-Sheikh Govemorate, which belong to the Animal Production Research Institute, Agricultural Research Center, Ministry of Agriculture, Cairo, Egypt and Food Technology Department, Faculty of Agriculture, Kafr El- Sheikh, Tanta University. The duration of the field experiment was 180 days. The objective of this study aimed to investigate the effect of using some commercial growth promoters (as feed additives) supplementation with the experimental ration of Friesian calves on: 1. Performance and production of growing Friesian calves. 2. Slaughtering characteristics of growing Friesian calves. 3. Physical characteristics of Longissimus dorsi muscle meat post-mortem as affected by growth promoters. 4. Chemical composition of Longissimus dorsi muscle meat post-mortem as affected by growth promoters. 5. Histological structure of Longissimus dorsi muscle meat post-mortem as affected by growth promoters. 6. Physical characteristics, chemical composition and histological structure of Longissimus dorsi muscle meat as affected by frozen storage time at -20°C for 6 months and some different growth promoters supplemented with the experimental ration of growing Friesian calves. 7. Chemical composition of drip which loss from frozen meat after thawing to know its nutritive value.