Effects of Humate Supplemented Diets and Body Weight On Performance and Egg Quality Parameters of Laying Hens
Authors: Şaban ÇELEBİ 
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This experement was conducted to determine the effects of different levels of dietary humate (0.0, 0.15, 0.30%) suplementation and body weight (light=1400-1500 g, medium=1500-1600, heavy=1600 < g) on laying performance and egg quality parameters of layers. A total of 216 Lohmann layers at age of 28 weeks were utilized as animal material. The experimental period lasted for 16 weeks. Except for feed consumption and feed conversion ratio, humat levels did not affect laying performance parameters. The Feed consumption and feed conversion ratio for groups of feeding humate suplementation diet (0.0, 0.15, 0.30 %) were found to be 125,8, 120,8, 123,4 g and 2,08, 2,0 and 2,0, respectively. All of the performance parameters were significantly affected by body weight. As body weight linearly increased, performance parameters also increased. But laying hens in light group consumed less feed for one kg egg pruduction than those of medium and heavy groups. Avarage daily feed intake (g), hen-day egg production (%), egg weight (g) and feed conversion ratio for light, medium and heavy groups were 119.5, 123.18, 127.3; 76.672, 82.190, 88.908; 61.29, 60.21, 62.69 and 1.98, 2.05, 2.08, respectively. The effect of humat level by body weight interaction on performance parameters was not found statistically significant. Except for egg yolk color and yolk index, egg quality parameters were not affected by humate levels. In addition, body weight had no significant effect on egg quality traits. Hens fed with diets including humate at differentlevels have produced more intensively coloured egg yolks than that of control group consumed feed without dietary humate. Although humat level by body weight interaction effected albumen index and Haugh unit, other egg quality parameters were not affected istatistically by this interaction. As a result, groups fed with diets including dietary humate at different levels and light group consumed less feed per kg egg pruduction than those of other groups.