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ÜLKER, HASAN

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ÜLKER

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HASAN

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    Publication
    Associations between CYP17 gene polymorphisms, temperament and maternal behavior in ewes, and growth in their lambs
    (Elsevier Science, 2021-06-30) Karaca, Serhat; Şer, Gazel; Ülker, Hasan; Yılmaz, Onur; Çakmakcı, Cihan; Ata, Nezih; Sarıbey, Muammer; ÜLKER, HASAN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Zootekni Bölümü.; JJB-9576-2023
    This study was conducted to determine temperament and maternal care classes, CYP17 gene polymor-phisms, and cortisol status of a group of Norduz ewes. Additionally, the relationships between these fac-tors, their effects on lambs survival and growth characteristics were investigated. A total of 72 ewes were subjected to arena and isolation box tests to determine their temperament classes. The distance the ewe retreated from the lamb during tagging was utilized to assess ewe maternal care classes. Ewes were genotyped for CYP17 628 SNP. Blood samples were collected between lambing and weaning to measure cortisol concentrations of ewes. The survival and growth data for the lambs of these ewes were recorded until weaning. Two temperament (low reactive and high reactive) and 2 maternal care classes (strong and moderate) were present. Two CYP 17 SNP 628 alleles (A and G) and 3 genotypes (AA, AG, and GG) were identified. For the distribution of CYP17 genotype frequencies within the population, the temperament or maternal care classes were not different (P > 0.05). The temperament of ewes did not affect mater-nal care in our flock. Positive partial correlations between cortisol and total cross, distance to stimulus, and sniffing were determined (P < 0.05). CYP17 genotype was an effective factor for some behavioral traits (i.e., total cross) and cortisol release (P < 0.001). Neither temperament (P = 0.636) nor maternal care classes (P = 0.985) differed with cortisol concentrations. CYP17 genotype, cortisol status, tempera-ment or maternal care class of ewes did not affect birth or weaning weight of their lambs (P > 0.05). Although there was no significant relationship among CYP17 genotype, maternal care, and lamb survival and growth, the effect of CYP17 genotype on some behavioral traits and cortisol release was found to be significant. Further studies with larger animal populations are required to elucidate the possible use of CYP17 SNP 628 genotypes as genetic markers for temperament classification.
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    Publication
    Does the length of time dried distillers' grain with solubles substitution for soybean meal affect physiological indicators and meat quality in finishing lambs?
    (Wiley, 2021-01-01) Karaca, Serhat; Erdoğan, Sibel; Güney, Mehtap; Çakmakcı, Cihan; Sarıbey, Muammer; Kor, Aşkın; Ülker, Hasan; ÜLKER, HASAN; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Zootekni Bölümü.; JJB-9576-2023
    This study examined how inclusion of dried distillers' grains with solubles (DDGS) in finishing lamb diets for different periods affects some physiological indicators and meat quality. A total of 40 male lambs were divided into four groups according to feeding regimen during the 120-day finishing period as follows: C120: no DDGS included in diet for 120 days; D120: DDGS included in diet for 120 days; D75: no DDGS included in diet for 45 days + DDGS included in diet for 75 days; D45: no DDGS included in diet for 75 days + DDGS included in diet for 45 days. Dietary inclusion rate of DDGS was 27.5%. Fattening performance and rumen parameters were not affected by treatment. Feeding regimens had no significant effect on meat quality except the instrumental tenderness and juiciness score. DDGS fed lambs had higher level of total trans fatty acids and n-6/n-3 ratio in meat. 10t-C18:1, 11t-C18:1 and 9c,11t conjugated linoleic acid contents of adipose tissue were higher in all the DDGS groups compared with C120 lambs (p < .001). These results suggest that soybean meal can be replaced with corn DDGS in lamb diets for up to 120 days during the finishing period with no adverse effects on some physiological response feedlot performance and meat quality.