@article{article_695761, title={The Effect of Dietary Probiotic Supplementation on Egg Weight in Laying Hens: A Meta–Analysis Study}, journal={Kocatepe Veterinary Journal}, volume={13}, pages={145–151}, year={2020}, DOI={10.30607/kvj.695761}, author={Kılıç, İbrahim and Berk, İhsan and Bozkurt, Zehra and Doğan, Yağmur Nil}, keywords={Probiotic,Bacillus subtilis,egg weight,laying hens,meta-analysis}, abstract={<div style="text-align:justify;"> <span style="font-size:.9em;">The aim of this study was to determine the effect of probiotic supplementation on egg weight in laying hens by using meta–analysis. The limitations of the eight studies –indexed in SCI– taken into the meta–analysis were 18 – 42 week old brown and white laying hens; 10( </span> <span style="font-size:8px;">7 </span> <span style="font-size:.9em;">) – 10( </span> <span style="font-size:8px;">10 </span> <span style="font-size:.9em;">) CFU/g Bacillus subtilis was used as a probiotic and the dose ranged between 400 – 1000 g/ton. The meta–analysis was carried out using (experimental–control) means for continuous data. As a result of the research, it was determined that all studies did not share a single common effect (heterogeneous). In addition, the overall effect size using the random effect model was calculated as 0.223. Based on z and p values, the hypothesis of the study was accepted (z = 2.90; p < 0.05). In other words, "the probiotic has a significant effect on egg weight in laying hens". </span> </div>}, number={2}, publisher={Afyon Kocatepe University}