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Articles by Hatice Hizli
Total Records ( 2 ) for Hatice Hizli
  Tugay Ayasan , Ferda Okan and Hatice Hizli
  Threonine is considered to be the third limiting amino acid for broiler chicks fed low protein corn-soybean meal diets. Very limited information is available on the requirement of the threonine for broilers. The aim of this study was to determine the threonine requirements of broiler chickens from 22-42 days of age. Seventy five Ross 308 one-day-old male broiler chicks were divided into five dietary treatment groups of similar mean weight, comprising 15 birds each. They were fed a basal starting diet containing 23% CP, 3200 ME kcal/kg, 0.81% threonine and 1.24% lysine for first 3 weeks. Chicks were randomly assigned to five treatments involving 0.70, 0.75, 0.80, 0.85 and 0.90% of total threonine for 21 days (between 22-42 days). Results indicated that a linear response to dietary threonine for final body weight, body weight gain and threonine intake occurred in experiment but other live performance parameters were not impacted by dietary threonine. Our results suggest that the current NRC recommendation of 0.74% threonine for 3-6 week old broilers is adequate to support comparable growth performance.
  Celal YUCEL , Hatice HIZLI , Huseyin Kansur FIRINCIOGLU , Abdullah CIL and Adem Emin ANLARSAL
  Improving forage production for an expanding livestock population is essential in the Çukurova and GAP (South-eastern Anatolia Project) regions of Turkey. Feed shortages, especially evident during winter, can be alleviated by introducing high yielding common vetch (Vicia sativa L.) cultivars into crop rotations. The objectives of this research were to determine the genotype x environment interactions and stability parameters for hay yield of 15 vetch lines and cultivars. The vetch genotypes were evaluated in the Çukurova (2 locations for 3 years) and South-eastern Anatolia (1 location for 2 years) regions. In the South-eastern Anatolia region, the rainfall limits plant growth, while the Çukurova region has much better soil and climatic conditions. Since local climatic variation is significant, each location in each year is treated as a separate environment, to give 8 environments. Linear regression techniques were used to analyse genotype x environment interactions (G x E). The hay yield was significantly different between genotypes and environments, while a genotype x environment interaction was present. The variation amongst environments was highly significant, and the mean hay yield ranged from 7453 kg ha-1, in Doðankent (2002-03), to 2687 kg ha-1, in Balcalý (2003-04). The genotypes 'V7' and 'V12', which had regression coefficients significantly greater than 1.0 and produced mean hay yields above the overall mean, were well adapted to favourable environments. Three entries (V5, V9, and V10) possessed regression coefficients significantly less than 1.0, with hay yield above the grand mean, suggesting that these genotypes were better adapted to poor environments and insensitive to environmental change. Our study demonstrated that previously selected genotypes and cultivars can be successfully grown and make a significantly positive contribution to animal husbandry in the Çukurova and South-eastern Anatolia regions.
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