340 Bulletin UASVM, Veterinary Medicine 65(1)/2008 pISSN 1843-5270; eISSN 1843-5378 THE PHENOTIPICAL PERFORMANCES OF ROSS 308 AND COOB 500, EXPLOITED IN THE NORTH WESTERN PART OF ROMANIA Paca I., T. Oroian, R. Oroian, Dana Pusta, R. Morar, Simona Pacalău, M. Balla, Ioana Dalea, Claudia Bagita University of Agricultural Sciences and Veterinary Medicine Cluj – Napoca, Faculty of Veterinary Medicine, Mănătur Street No. 3 – 5, 400372 Cluj- Napoca, Romania, e-mail: nicupasca@personal.ro Keyword: hatching; hybrid; leakage; variant Abstract: For this experiment two batches of one day old chickens were taken into study; each of 50 individuals from Ross 308 and Cobb 500 hibrids; raised at ground; in a density of 18/m 2 ; in the same microclimath conditions (temperature; humidity; light; aering); feeding; watering and medication. The body weight gain was investigated at determined periods of time; the average daily weight gain; and after slaughtering the carcass mass was studied; the percentage of different body regions as commercial value (chest with bone; whole thighs; wings) and other organs (liver; stomach); also other products (blood; feather; gastrointestinal tract). Analising the obtained data; higher results were recorded in the case of hibrid Cobb 500 for all investigated attributes; compared to Ross 308 hibrid. INTRODUCTION Avian meat is a highly valuable food product for mankind; in its favour pleeding not only the low cost of obtaining it but also its nutritional qualities. In this context; specialists look for new selection methods through which hibrids of a qualitative and quantitative production of meat; close to the biological limit; in a short period of time. MATERIAL AND METHODS The biological material was represented by the meat Ross 308 (meat tetraliniar hibrid of the firm Ross Breeders from the Great Britain) and Cobb 500 (meat tetraliniar hibrid produced by the firm Cobb Breeding Company Ltd from Englang) hibrids. Both hibrids are known by their special performances. Ross 308 hibrid is a meat hibrid; with a rapid body development; efficient feeding and a very good slaughtering value. Cobb 500 hibrid adapts itself easily to different types of climath and doesn’t necesitate special breeding conditions; is sexable at one day after the development of primary remiges; very viable and doesn’t need special conditions compared to other hibrids. To realise this study; two experimental batches were made; each of 50 individuals. The breeding was made at ground; with a density of 18 chickens/m 2 . During the entire period of the experiment; the same conditions of temperature; water; light and feeding were held; the feeding type; corresponding to the life period of the chickens (Starter – 14 days; growing 15 – 32 days; finish 33 – 42 days). Also; the immunoprofilactic programme was realised; at 1 day PPA vaccination with Vitapest; between 1 – 5 antibiotics Colivet and vitamins Nutril Se; 7 – 8 days; at 9 days BIA vaccination with MB; between 10 – 14 days antibiotics Anflex; Nutril Se vitamins; at 22 - 23 days – Amprosol; at 24 days; PPA vaccination – Antipestivac; and between 25 – 29 days Amprosol vitamins; Tylesin antibiotics. brought to you by CORE View metadata, citation and similar papers at core.ac.uk