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Tétel Szabadon hozzáférhető Effect of ambient temperature on the productive and carcass traits of growing rabbits divergently selected for body fat contentMatics, Zsolt; Gerencsér, Zsolt; Kasza, Rozália; Terhes, Katalin; Nagy, István; Radnai, István; Dalle Zotte, Antonella; Cullere, M; Szendrő, Zsolt; egyetemi oktató, kutatóRabbits are particularly sensitive to heat stress which can affect productive performance, with rabbit breed/line possibly playing a role on the response to this condition. The study aimed at evaluating the effect of different ambient temperatures on the live performance and carcass traits of growing rabbits divergently selected for total body fat content. The two genetic lines (Lean and Fat) were selected based on the total body fat content estimated by computer tomography during five generations. From birth to slaughter (13 weeks of age), the rabbits were housed in two rooms where the temperature was controlled with air conditioners: in the control room the average ambient temperature was 20 °C and in the high temperature room it was 28 °C. After weaning (35 d), 60 Lean and 60 Fat rabbits/room were housed by two in wire-mesh cages and fed ad libitum with commercial pellets. The BW and feed intake (FI) were measured at 5, 7, 9, 11 and 13 weeks of age to calculate the daily weight gain (DWG) and feed conversion ratio (FCR). Mortality was recorded daily. At the end of the experi ment, rabbits were slaughtered and carcass traits were measured. Mortality was independent of temperature and line. The temperature significantly influenced the FI, DWG, BW and the fat deposits: they were lower at higher ambient temperature. The effect of temperature differed according to the rabbits' total body fat content. At control temperature, the FI (165 vs 155 g/day; P < 0.05) and FCR (4.67 vs 4.31; P < 0.05) were higher in Fat rabbits, which also had more perirenal (36.2 vs 23.1 g; P < 0.05) and scapular fat (10.8 vs 7.1 g; P < 0.05). At high temperature, no differences in fat depots (14.5 vs 9.8 g; 5.3 vs 3.5 g) were found between the two lines. It can be concluded that temperature × genetic line interaction had an important role in productive and carcass traits, as the effect of temperature differs between Lean and Fat rabbits.Tétel Szabadon hozzáférhető AZ ELTÉRŐ KÖRNYEZETI HŐMÉRSÉKLET HATÁSÁNAK VIZSGÁLATA ALACSONY ÉS MAGAS TESTZSÍRTARTALOMRA SZELEKTÁLT NÖVENDÉKNYULAKONTerhes, Katalin; Gerencsér, Zsolt; Nagy, István; Radnai, István; Kasza, Rozália; Dalle Zotte, Antonella; Cullere, M; Matics, Zsolt; egyetemi oktató, kutatóThe aim of the study was to investigate the effect of divergent selection for total body fat content on the production performance and carcass traits of growing rabbits at different ambient temperature. The experiment was conducted at Kaposvár University with Pannon Ka growing rabbits. Weaned rabbits (n= 60 Lean and 60 Fat rabbits/room) were housed in two identical rooms where the temperature was controlled with air conditioner. In the control room the average ambient temperature was 20°C and in the other room it was 28°C. The rabbits were born in these rooms, and were housed from weaning (5 wk) to slaughtering (13 wk) in wire-mesh cages (2 rabbits/cage) and fed ad libitum with commercial pellet. Body weight and feed consumption was measured fortnightly and the individual weight gain and feed conversion ratio were calculated. At the end of the experiment rabbits were slaughtered. The temperature significantly influenced the production performance and carcass traits. On higher temperature feed intake, weight gain and body weight decreased but the feed conversion ratio improved. The Lean rabbits were heavier and their chilled carcass was greater than Fat rabbits on higher temperature. On control temperature Fat rabbits consumed more feed and their feed conversion ratio deteriorated. The perirenal and scapular fat were lower on higher temperature in both genotype, but Fat rabbits had significantly more fat than Lean rabbits. The higher temperature had negative effect on the production but Lean rabbits had better results in some traits than Fat rabbits.