ARTICLE FEED & ADDITIVE MAGAZINE February 2023 63 On the other hand, it was found that feed consumption in the experimental groups containing ShellSupport was lower than in the control groups and the groups without Shell Support, and the feed utilisation coefficient was lower. Decrease in Broken-cracked Egg Ratio As for the rate of broken cracked eggs, the highest value of 4.82% was observed in the control group. The group with Shell Support achieved 4.12% better results than the control group. ABSTRACT The current practice for meeting the calcium requirements of poultry is to add calcium carbonate directly to the ration. In particular, attempting to meet the high calcium requirements of poultry in the laying period in this manner requires the use of calcium carbonate in a high proportion (7%-9%) in poultry rations. This study investigated the effects of applying Vitalic Shell Support on egg production characteristics and egg shell quality without adding additional calcium to rations for aged commercial laying hens under warm environmental conditions. The addition of Shell Support to the rations of commercial laying hens later in the laying period significantly increased egg production by reducing feed consumption and feed efficiency coefficient without compromising animal health. On the other hand, the addition of Shell Support reduced the rate of broken-cracked eggs. References 1. Ahmad, H. A., Yadalam, S. S. and Roland, D. A., 2003, Calcium requirements of bovanes hens, International Journal of Poultry Science 2(6), 417420. 2. Öğün, S., 1981., Tavuklarda değişik kalsiyum fosfor oranlarının yumurta verimine ilişkin ölçütler üzerindeki etkileri, Çukurova Üniv. Zir. Fak. Yayınları: 156, Bilimsel Araştırma ve Inceleme Tezleri: 47, Adana. 3. Tabib, I. ve Onbaşılar, E., 2019, The Structure of Eggshell and Factors Affecting Shell Quality in the Chicken Egg, Journal of Poultry Research,16 (2), 48-54. About Asli Selvi Asli Selvi grew up in Turkey. She completed her undergraduate studies in chemistry. In 2014, she started her PhD training in the Department of Animal Breeding. She has been working in the livestock industry for about ten years. Since 2018, she has been working at Intermak A.S. a research and development specialist in the feed additives department.
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