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Articles by A. Hayirli
Total Records ( 3 ) for A. Hayirli
  M.A. Yoruk , M. Gul , A. Hayirli and M. Karaoglu
  This study was conducted to determine effects of dietary NaHCO3 supplementation on egg production and egg quality during the late laying period. Hisex Brown layers, 54 wks of age, were blocked according to the cage location and then assigned randomly to receive one of four diets containing 0, 0.1, 0.2, or 0.4% NaHCO3 for 75 d. Each diet was replicated in 6 groups; each consisting of 2 cages containing 10 hens. Feed intake (FI) and egg production (EP) were recorded daily and egg weight (EW) was measured bi-weekly. A sample of 12 eggs from each group were collected randomly every 25 d for specific gravity (SG), shape index (SI), shell stiffness (SS), shell thickness (ST), yolk color (YC), albumen index (AI), yolk index (YI) and Haugh unit (HU). The mortality rate (MR) and feed conversion ratio (FCR) were lower, whereas FI, EP and EW were greater for hens fed the experimental diets than those for hens fed the control diet. Moreover, increasing NaHCO3 level linearly decreased MR and FCR, linearly increased EP and EW and quadratically increased FI. Specific gravity and YI for hens fed the experimental diets were lower than for fed the control diet. The diets did not affect SI, SS, ST, YC, AI and HU. However, SG and YI decreased linearly and AI increased linearly with increasing NaHCO3 level. In conclusion, increasing sodium bicarbonate level positively affected laying performance and altered inner egg quality, but did not improve shell quality, during the late laying period in hens.
  M.A. Yoruk , M. Gul , A. Hayirli and M. Karaoglu
  This experiment was conducted to evaluate the effects of multi-enzyme supplementation on laying performance, metabolic profile and egg quality of peak producing hens. Lohman layers (n = 144) were blocked according to the location of cages. After one week of the adaptation period, hens were randomly assigned to receive one of three corn-soybean meal based diets supplemented with multi-enzyme (0, 1, or 2 g/kg) from 30 to 46 weeks of age as 12 replicate cages of 4 hens. The active ingredients of the multi-enzyme supplement were fungal xylanase, fungal β-gluconase, alpha-amylase, pectinase, β-gluconase, endo- β-gluconase, pentosonase, pectinase and hemicellulase. Egg production (EP) and feed intake (FI) were measured daily and egg weight was measured fortnightly. Feed conversion ratio (FCR) was expressed as kilogram of feed consumed per kilogram of egg produced. Two eggs were collected randomly from each cage every 4 weeks to determine egg quality. Body weights (BW) were measured at the beginning and end of the experiment. Blood was also sampled at the end of the experiment to evaluate metabolic profile. The data were analyzed using ANOVA as repeated measures with time being as subplot. The multi-enzyme supplementation did not affect BW, FI and EP; decreased FI; and improved FCR. Except for serum albumin and yolk index, none of metabolic profile and egg quality parameters was affected by the dietary treatments. In conclusion, despite no changes in egg production, decreased feed intake and consequently, improved feed conversion in response to multi-enzyme supplementation could be attributed to enhanced utilization of nutrients.
  Y. Sa s?z , A. Hayirli , N. Sabuncuo lu , A. Yildiz , E. La?in and ?. ?oban
  This experiment was conducted to compare growth characteristics of Holstein (n = 12), Brown Swiss (n = 10) and Holstein x Brown Swiss crossbred (n = 6) spring-born calves supplemented with grain during the wintering period. After ending the weaning period, animals were transferred to tie-stall barn and were subjected to three phases of wintering, each lasting 56 days. From beginning of 219 days of age, during 168-day experimental period (6 months), live weight was measured bi-monthly period. In addition to ad libitum hay, each animal was supplemented with 1, 1.25 and 1.50 kilogram barley per day during the respective experimental periods. Data were analyzed using the GLM procedure using initial body weight as a covariate. There was no breed effect on body weight, feed intake, average daily gain and feed conversion ratio. However, bull calves gained more body weight and consumed less amount of feed per kilogram body weight gained than heifer calves. There was no breed by sex interaction effect on growth performance variables. A lack of breed differences could be attributed to grain supplementation. Sex effect, though experiment conducted pre-puberty period, on growth performance was ambiguous. Results of this experiment suggest that regardless of animal breed, feeding post-weaned calves nutritionally balanced ration –grain supplementation– has merit to achieve optimum body weight for grazing season to reduce slaughter age and subsequent successful reproductive performance to be used as replacement heifers.
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