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The highest HPG diameter 14.89\u2009\u00b1\u20090.097\u00a0\u00b5m and surface area 0.065\u2009\u00b1\u20090.001\u00b5m<jats:sup>2<\/jats:sup> were observed in the bees group fed with both probiotic and soya patty. Additionally, the same trend was observed in all morphometric parameters with the bees group fed with probiotic bacteria and soya patty. More royal jelly can be produced by larger HPGs than by smaller ones. Thus, the use of probiotics as a natural alternative tool boosted the development of <jats:italic>Apis mellifera<\/jats:italic> nurse workers\u2019 HPG that will positively affect the beekeepers\u2019 economy by providing a higher yield of royal jelly production. Overall, the study\u2019s findings show that probiotics are a useful feed supplement for honeybees.<\/jats:p>","DOI":"10.1007\/s12602-023-10107-0","type":"journal-article","created":{"date-parts":[[2023,6,19]],"date-time":"2023-06-19T07:02:35Z","timestamp":1687158155000},"page":"1214-1220","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Influence of Probiotics Feed Supplementation on Hypopharyngeal Glands Morphometric Measurements of Honeybee Workers Apis mellifera L."],"prefix":"10.1007","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1862-4175","authenticated-orcid":false,"given":"Ashwak Abdel-Moneim","family":"Hassan","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7930-6376","authenticated-orcid":false,"given":"Yasser Essam","family":"Elenany","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,6,19]]},"reference":[{"key":"10107_CR1","doi-asserted-by":"publisher","first-page":"72","DOI":"10.1016\/j.smallrumres.2019.04.011","volume":"175","author":"Z Hajalizadeh","year":"2019","unstructured":"Hajalizadeh Z, Dayani O, Khezri A et al (2019) The effect of adding fennel (Foeniculum vulgare) seed powder to the diet of fattening lambs on performance, carcass characteristics and liver enzymes. 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