Yazar "Dere, S." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    Live Performance and Carcass Yields of Broilers in Different Intermittent Lighting Schedules
    (1996) Işcan, K. M.; Inal, Ş.; Dere, S.; Azman, M. Ali; Ünsaldi, T.
    The purpose of the present study was to measure performance and carcass yield from broilers maintained on different photoschedules and to compare electricity savings. Day-old 430 broiler chicks from an Avian × Peterson strain cross were used as research materials. There were four lighting treatment (LT) groups. All groups were kept under 231:1D from to 7 days. Four pens were randomly assigned to each of four light treatment groups: 1) 1L:1D, 2) 1L:2D, 3) 1L:3D, and 4) 23L:1D from 8 to 48 days. It was found that there were statistically significant differences for body weights (BW) between different lighting treatment groups at 42 days (P<.05), but that there were no differences with respect to BW between LT groups at 49 days. Feed efficiency values of groups 1, 2, 3, and 4 were estimated at 2.003, 1.987, 1.972, and 2.080, respectively. There were no statistically significant differences among treatments for mortality rates at 49 days of age. But mortality rates of the third and fourth groups were numerically bigger than those of the first and second groups. Mortality rates of the third and fourth groups were estimated greater than standard mortality rate values. The incidence of leg problems was influenced by lighting treatments. There were significant differences with respect to the weights of different parts of the carcasses (P<.01) and no differences for the percentages of carcass parts except in breast percentage between LT groups (P<.05). The carcass weights of first and second groups were found to be heavier than those of the other groups (P<.05). The amounts of electricity used by research groups 1, 2, 3, and 4 during the 49-day rearing period were determined to be 16.3, 12.2, 10.2, and 27.5 kW/h respectively. It has been conluded that continuous lighting treatment in broiler rearing has had no benefit in broiler performance.
  • Küçük Resim
    Öğe
    Serum and colostrum/milk alkaline phosphatase activities in the determination of passive transfer status in healthy lambs
    (ECOLE NATIONALE VETERINAIRE TOULOUSE, 2004) Maden, Mehmet; Birdane, Fatih Mehmet; Altunok, Vahdettin; Dere, S.
    The aim of this study was to evaluate the importance of serum and colostrum/milk alkaline phosphatase (ALP) enzyme activity in the determination of passive transfer status in healthy lambs. Thirty Akkaraman Sheep (3-6 years old) which had normal pregnancy period and their 0 to 15 days old lambs (n=30) were used. Blood and colostrum/dmilk samples were collected from sheep and lambs after birth, before suckling (0 Day) and at the 1(st), 3(rd), 7(th) and 15(th) day. Serum IgG concentration was determined by the use of Single Radial Immunodiffusion (SRID) method. Serum ALP activity was measured, using a colorimetric kit. Correlations were carried out between immunoglobulin concentrations and ALP activities. Regression models (simple and multiple) were calculated. In lambs, although positive correlations were obtained between ALP activities and 1, G concentrations in serum at Days 1, 3 and 7 (r = 0.689, p < 0.01, r = 0.464, p < 0.05 and r = 0.413, p < 0.05 respectively), the variations of the 2 parameters showed marked discrepancies during the experiment : the ALP activity was maximum at day 0 whereas IgG concentrations were very low and from day 7 to day 15, ALP activity rose tip when IgG concentrations continued to decrease. From day 0 to day 7, ALP activities decreased in colostrum/milk whereas IgG concentrations were stable. Positive correlations between these 2 variables were only found on days 1 and 3 (r 0.404, p < 0.05 and r = 0.580, p < 0.01 respectively). Consequently, ALP activities were not strictly correlated with IgG concentrations nor in colostrum/milk either in lamb serum, and multiple regression models were not really suitable to calculate IgG concentrations. ALP activity is not Suitable for accurately predicting lamb IgG status and eventual failure for immune passive transfer.