{"title":"Effects of Calcium Carbonate Particle Size, Phytase and Midnight Feeding on Performance, Egg and Bone Quality and Blood Parameters in Laying Hens.","authors":"Vahid Salehi, Reza Vakili, Mahdi Elahi Torshizi","doi":"10.1002/vms3.70248","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>To achieve maximum production in laying hens, calcium (Ca) and phosphorus (P) are two important minerals in the diet. Nutritional solutions such as adding coarser Ca particles in the afternoon or considering the light hours during the night to feed the birds might improve the eggshell quality and reduce Ca mobilization from the bone.</p><p><strong>Objectives: </strong>This experiment aimed to study the effect of calcium carbonate particle size (CCps), phytase (Pht) and midnight feeding (MF) on the performance, egg and bone quality and blood parameters in laying hens from 60 to 70 weeks of age.</p><p><strong>Methods: </strong>A total of 720 Hy-line (W-36) laying hens were arranged in a factorial arrangement of 2 × 2 × 2 based on a completely randomized design with two types of CCps (100% fine and 75% coarse + 25% fine), two levels of Pht (0 and 300 FTU/kg) and two states of feeding (MF and without MF). The experimental period lasted 12 weeks from 60 to 70 weeks of age.</p><p><strong>Results: </strong>During the trial, the significant impact of CCps on the feed conversion ratio (FCR) and breaking strength (BS) of the tibia was obtained (p < 0.05). FCR, eggshell percentage and the percentage of tibia ash, Ca and P were affected by Pht supplementation (p < 0.05). MF affected egg weight (EW), eggshell percentage and serum concentration of Ca, P and alkaline phosphatase (ALP) (p < 0.05). The interaction effects of CCps and Pht were significant for Ca level in serum (p < 0.05).</p><p><strong>Conclusions: </strong>In general, the use of Pht in the diets improved the FCR and quality of eggshell and tibia, and diets containing Pht and coarser CCps increased blood Ca levels. Despite the improvement of egg quality by MF, serum parameters showed a significant decrease.</p>","PeriodicalId":23543,"journal":{"name":"Veterinary Medicine and Science","volume":"11 2","pages":"e70248"},"PeriodicalIF":1.8000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11869578/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Veterinary Medicine and Science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1002/vms3.70248","RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"VETERINARY SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Background: To achieve maximum production in laying hens, calcium (Ca) and phosphorus (P) are two important minerals in the diet. Nutritional solutions such as adding coarser Ca particles in the afternoon or considering the light hours during the night to feed the birds might improve the eggshell quality and reduce Ca mobilization from the bone.
Objectives: This experiment aimed to study the effect of calcium carbonate particle size (CCps), phytase (Pht) and midnight feeding (MF) on the performance, egg and bone quality and blood parameters in laying hens from 60 to 70 weeks of age.
Methods: A total of 720 Hy-line (W-36) laying hens were arranged in a factorial arrangement of 2 × 2 × 2 based on a completely randomized design with two types of CCps (100% fine and 75% coarse + 25% fine), two levels of Pht (0 and 300 FTU/kg) and two states of feeding (MF and without MF). The experimental period lasted 12 weeks from 60 to 70 weeks of age.
Results: During the trial, the significant impact of CCps on the feed conversion ratio (FCR) and breaking strength (BS) of the tibia was obtained (p < 0.05). FCR, eggshell percentage and the percentage of tibia ash, Ca and P were affected by Pht supplementation (p < 0.05). MF affected egg weight (EW), eggshell percentage and serum concentration of Ca, P and alkaline phosphatase (ALP) (p < 0.05). The interaction effects of CCps and Pht were significant for Ca level in serum (p < 0.05).
Conclusions: In general, the use of Pht in the diets improved the FCR and quality of eggshell and tibia, and diets containing Pht and coarser CCps increased blood Ca levels. Despite the improvement of egg quality by MF, serum parameters showed a significant decrease.
期刊介绍：
Veterinary Medicine and Science is the peer-reviewed journal for rapid dissemination of research in all areas of veterinary medicine and science. The journal aims to serve the research community by providing a vehicle for authors wishing to publish interesting and high quality work in both fundamental and clinical veterinary medicine and science.
Veterinary Medicine and Science publishes original research articles, systematic reviews, meta-analyses, and research methods papers, along with invited editorials and commentaries. Original research papers must report well-conducted research with conclusions supported by the data presented in the paper.
We aim to be a truly global forum for high-quality research in veterinary medicine and science, and believe that the best research should be published and made widely accessible as quickly as possible. Veterinary Medicine and Science publishes papers submitted directly to the journal and those referred from a select group of prestigious journals published by Wiley-Blackwell.
Veterinary Medicine and Science is a Wiley Open Access journal, one of a new series of peer-reviewed titles publishing quality research with speed and efficiency. For further information visit the Wiley Open Access website.
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