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    Effect of dietary vitamin A and zinc on egg yield and some blood parameters of laying hens
    (Scientific Technical Research Council Turkey, 2001) Kaya, S; Umucalilar, HD; Haliloglu, S; Ipek, H
    The purpose of the present study was to examine the effects of vitamin A and zinc interaction in laying hens fed on diets supplemented with two different levels of vitamin A (0, 10.000 IU/kg) in combination with five different levels of zinc (0, 25, 50, 100, 200 mg/kg) on egg yield, plasma and yolk concentration of zinc, and the levels of plasma triglyceride and phosphorus for 12 weeks. Egg production, egg weight, feed intake, body weight and feed efficiency did not differ among the groups. Plasma and yolk zinc concentrations were affected only by zinc supplementation. An interaction between vitamin A and zinc had an effect and the independent effect of vitamin A supplementation increased the plasma triglyceride levels of laying hens. The level of phosphorus in plasma was altered by zinc supplementation and an interaction between zinc and vitamin A. Since the positive relationship between plasma zinc and egg production was observed (r=0.279 p<0.0 1), it is suggested that plasma zinc may be an indicator for the estimation of egg production or hen performance.
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    Effects of zinc and vitamin A supplements on plasma levels of thyroid hormones, cholesterol, glucose and egg yolk cholesterol of laying hens
    (Elsevier Sci Ltd, 2001) Kaya, S; Keçeci, T; Haliloglu, S
    The effects of zinc and vitamin A supplementation to the diet on some blood metabolites were evaluated in Hisex brown laying hens from 56 weeks to 68 weeks of age. A total of 130 birds were divided into two main groups according to vitamin A treatment (0 and 3.44 mg retinyl acetate kg(-1) feed, respectively). each consisting of 65 hens. Hens in both of the main groups were then, divided into five zinc treatment groups (0, 25, 50, 100 and 200 mg zinc kg diet(-1) respectively) of 13 hens each. It was observed that plasma T-4.T-3 and total cholesterol levels were affected by only zinc supplementation. While 100 and 200 mg Zn kg(-1) decreased plasma T-4 level compared to control value. plasma T-3 level was reduced by 100 mg Zn kg(-1) compared to groups fed less Zn. Adding 50 and 200 mg Zn kg(-1) to the diet increased plasma total cholesterol level in the birds compared to other groups. Vitamin A, zinc. and their interaction did not influence the concentration of plasma high-density lipoprotein (HDL)-cholesterol, glucose and egg yolk cholesterol in laying hens. (C) 2001 Harcourt Publishers Ltd.
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    Feeding diets supplemented with zinc and vitamin A in laying hens: effects on histopathological findings and tissue mineral contents
    (W B Saunders Co Ltd, 2002) Kaya, S; Ortatatli, M; Haliloglu, S
    The effects of different dietary levels of zinc and vitamin A on tissue mineral accumulation and histopathological alterations were examined in laying hens. For this purpose, 130 Hisex brown laying hens aged 56 weeks were divided into two main groups. Each group of hens were fed on diets supplemented with two different levels of vitamin A (010 000 IU kg(-1)). Then, laying hens in both of the main groups were subdivided into five treatment groups given different levels of zinc (0, 25, 50, 100, and 200 mg kg(-1)) for 12 weeks. Dietary additions of zinc and/or vitamin A did not significantly affect the zinc concentrations of the pancreas, liver, gizzard, thyroid, and copper concentrations of the pancreas, gizzard, and thyroid. The group fed the highest zinc (200 mg kg(-1)) in the diet had twofold iron concentration in their thyroid tissue compared to the concentration of the control group receiving no extra zinc. Histopathologically, there was slight oedema, degranulation, and vacuolation in exocrine cells and some fibrotic areas in the pancreas and reduced follicular size. Follicular cell hypertrophy and hyperplasia occurred in the thyroids, and gizzard erosions were seen in some cases. (C) 2002 Elsevier Science Ltd. All rights reserved.