Person: ŞAHAN, ÜMRAN
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Publication Identifying parents and generating hybrids with high combining ability for yielding fresh cocoon and raw silk in silkworm (Bombxy mori L.)(Revista Brasileira Zootecnia Brazilian Journal Animal Sci, 2020-01-01) Şahan, Ümran; ŞAHAN, ÜMRAN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi; AAH-2966-2021This study was carried out to identify parents and hybrids by determination of general combining ability (GCA), specific combining ability (SCA), and heterosis in pure lines and their hybrids, which were selected from our gene sources, to determine new hybrid combinations that could be alternative or higher in yielding compared with M x N hybrid used in production. Combining ability and heterosis effects were studied for the eight quantitative characters through line x tester mating design. Chinese origin lines (KZ, ZF) were identified as females and Japanese origin lines (BR, ZB) as males, and by these, four hybrids were derived. M, N, and their hybrid were both used as control genotypes and to calculate the heterosis and commercial heterosis as well. All the genotypes were reared in standard conditions, in three replications. ZF (for pupa survival rate) and ZB (for hatching and filament length) presented significantly higher and positive GCA effects. In addition, ZB had negative GCA effect for infertile egg rate. Effects of SCA were not significant for all the characters. In conclusion, ZF x ZB hybrid could have a potential for the higher cocoon and silk production in Turkey.Publication Biochemical changes in hemolymph of spinning and non-spinning silkworm larvae, bombyx mori (l., 1758) (Lepidoptera: Bombycidae), reared on fresh mulberry leaves: Possible reasons for non-spinning syndrome(Ege Üniversitesi, 2020-01-01) Şahan, Ümran; Gül, Zülfiye; Büyükuysal, Levent Rıfat; ŞAHAN, ÜMRAN; BÜYÜKUYSAL, RİFAT LEVENT; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Zootekni Bölümü; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Tıbbi Farmakoloji Anabilim Dalı; AAH-2966-2021; IKI-0689-2023Non-spinning syndrome in Bombyx mori (L., 1758) (Lepidoptera: Bombycidae) is a serious issue for the sericulture industry. Determination of urea metabolism as an important parameter at the onset of spinning has shown the need for examining the role of urea metabolism in the non-spinning syndrome. The aim of this study was to investigate role of urea metabolism in the non-spinning syndrome by evaluating urease activity and L-arginine concentrations in the silkworm hemolymph and mulberry leaves. Additionally, urea concentrations were determined in hemolymph samples. Urease activities in hemolymph samples were almost twice as high in spinning larvae (SL) than in non-spinning larvae, 25 +/- 5.8 vs 10.9 +/- 2.4 units/l (P < 0.05). Urea concentrations in the SL hemolymph decreased significantly from day 5 (137 +/- 13 mg/l) to day 7 (97 +/- 17 mg/l) of the fifth instar (P < 0.01), it remained almost constant in NSL hemolymph (149 +/- 19 to 167 +/- 4 mg/l). Additionally, L-arginine concentrations in hemolymph samples obtained from NSL of 4.55 +/- 0.48 mM were significantly higher than in SL at 2.72 +/- 0.45 mM (P < 0.01). Changes in urease activity and L-arginine concentrations in hemolymph were similarly observed in mulberry leaves. These results suggested that changes in urea metabolism may cause or contribute to non-spinning syndrome in silkworms.Publication Eggshell water vapor conductance and shell structural characteristics of broiler breeder in different flock ages(Galenos Publ House, 2020-01-01) Sözcü, Arda; Sabah, Saliha; Şahan, Ümran; ŞAHAN, ÜMRAN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi; 0000-0003-4577-8054; AAH-2966-2021The aim of the study was to investigate eggshell traits; including eggshell water vapor conductance, eggshell thickness, pore density, egg weight loss as well as eggshell surface area and volume in 28 and 40 week-old broiler breeders. Furthermore, the phenotypic correlations among the eggshell characteristics were determined. The eggs were ranged from 54.41 g to 60.78 g and 54.71 g to 60.62 g in 28 and 40 wk-old age groups, respectively. All eggs were weighed and numbered before setting and were monitored individually until the end of the incubation. Mean eggshell water vapor conductance (G) value was 11.00 +/- 1.01 mg H2O day(-1) torr(-1) in 28 wk-old flock and 11.99 +/- 1.28 mg H2O day(-1) torr(-1) in 40 wk-old flock respectively (P<0.05). The mean value of shell thickness and pore density mean along with the two regions (broad end and equator) were higher and significant in 28 wk-old flock (P<0.01). Egg weight loss was not found to be significant. Surface area was higher in 40 wk-old flock while as volume was higher in 28 wk-old flocks (P<0.01). There was no correlation between eggshell thickness and pore density. Both eggshell thickness and pore density were having significant positive correlation along with three eggshell regions in each flock ages (P<0.01).Publication The effects of different eggshell temperatures between embryonic day 10 and 18 on broiler performance and susceptibility to ascites(Facta-fundacio Arnco Ciencia Tecnologia Avicolas, 2015-07-01) İpek, Aydın; İPEK, AYDIN; Şahan, U.; ŞAHAN, ÜMRAN; Sözcü, A.; SÖZCÜ, ARDA; Bursa Uludağ Üniversitesi/Ziraat Fakültesi.; AAH-2966-2021; AAH-3973-2021; AAA-5866-2020; AAH-2551-2021The aim of the current study was to determine the effects of low (33.3-36.7 degrees C), control (37.8-38.2 degrees C) and high (38.9-40.0 degrees C) eggshell temperatures (ESTs) between days 10-18 of incubation on broiler performance and susceptibility to ascites. The effects of different ESTs on hatchling weight were significant. The highest residual yolk sac weight (7.7 g) and relative yolk sac weight (18.7%) were observed in high EST group, whereas the highest yolk-free body weight (36.22 g) was obtained in the control group. Relative post-hatch heart weight was lower in the high EST group (0.64%) compared with the control (0.84%) and low (0.88%) EST groups. At 6 weeks of age, body weights of broilers of the low, control, and high EST groups were 2172.6, 2543.9, 2282.6 g respectively. During the 6-week life span, the feed conversion ratio of broilers in the low (1.86) and high (1.83) EST groups was significantly worse than of those in the control EST group (1.68). Higher packed cell volume (PCV) and red blood cell (RBC) values were obtained in the high EST group relative to the other groups, whereas hemoglobin (Hb) level was lower in the control group than in the others. The relative heart weights and right ventricular to total ventricular (RV: TV) ratio for low, control, and high EST group were 0.46, 0.40, 0.37 g and 0.27, 0.28, 0.33% respectively. In conclusion, incubation length, yolk sac absorption, residual yolk sac weight, yolk-free BW, post-hatch performance, and heart, blood parameters, abdominal fluid accumulation at slaughter age are affected by changes in EST between incubation days 10 to 18.