Eggshell quality and calcium utilization in feed of hens in repeated laying cycles
Hens of the laying hybrid Shaver Starcross 288 were used in two consequential experiments. The first experiment (for 10 months) was conducted on hens at the age from 18 to 60 weeks (1st cycle; n = 50) and moulted hens after 10 months laying from 70 to 110 weeks of age (2nd cycle; n = 50). For the se...
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| Format: | Article |
| Language: | English |
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Czech Academy of Agricultural Sciences
2010-02-01
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| Series: | Czech Journal of Animal Science |
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| Online Access: | https://cjas.agriculturejournals.cz/artkey/cjs-201002-0003_eggshell-quality-and-calcium-utilization-in-feed-of-hens-in-repeated-laying-cycles.php |
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| author | H. Arpášová M. Halaj P. Halaj |
| author_facet | H. Arpášová M. Halaj P. Halaj |
| author_sort | H. Arpášová |
| collection | DOAJ |
| description | Hens of the laying hybrid Shaver Starcross 288 were used in two consequential experiments. The first experiment (for 10 months) was conducted on hens at the age from 18 to 60 weeks (1st cycle; n = 50) and moulted hens after 10 months laying from 70 to 110 weeks of age (2nd cycle; n = 50). For the second experiment (for 8 months) in the 1st cycle 18 weeks old hens were bought (n = 60) and hens from the first experiment after moulting were used in the 2nd and 3rd cycle (n = 32 and n = 28). During the experiments eggshell qualitative parameters and calcium utilisation (%) were determined. The results indicate that the percentage of eggshell decreased with the increasing number of cycles. The significant correlation of the eggshell proportion and the age of hens was higher in long, advanced cycles (P < 0.05). The shell strength in both experiments decreased slightly in relation to the age of hens and repeated laying cycles. The shell deformation had an opposite trend to the shell strength, i.e. it increased with the increasing laying. The average shell thickness showed a decrease in the repeated laying cycles, more significant in shorter cycles (P < 0.01). The specific shell gravity maintained balanced values both in cycles and by the age of hens. The shell density in all cycles in both experiments showed a decreasing tendency in relation to the age of hens. In dietary calcium utilization for the shell formation a significant decrease was recorded in the second cycles after moulting (P < 0.05). |
| first_indexed | 2024-04-10T08:27:16Z |
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| id | doaj.art-61f1d5dc05304abcb479e68b49dc44e4 |
| institution | Directory Open Access Journal |
| issn | 1212-1819 1805-9309 |
| language | English |
| last_indexed | 2024-04-10T08:27:16Z |
| publishDate | 2010-02-01 |
| publisher | Czech Academy of Agricultural Sciences |
| record_format | Article |
| series | Czech Journal of Animal Science |
| spelling | doaj.art-61f1d5dc05304abcb479e68b49dc44e42023-02-23T03:32:47ZengCzech Academy of Agricultural SciencesCzech Journal of Animal Science1212-18191805-93092010-02-01552667410.17221/90/2009-CJAScjs-201002-0003Eggshell quality and calcium utilization in feed of hens in repeated laying cyclesH. Arpášová0M. Halaj1P. Halaj2Slovak Agricultural University in Nitra, Nitra, Slovak RepublicSlovak Agricultural University in Nitra, Nitra, Slovak RepublicSlovak Agricultural University in Nitra, Nitra, Slovak RepublicHens of the laying hybrid Shaver Starcross 288 were used in two consequential experiments. The first experiment (for 10 months) was conducted on hens at the age from 18 to 60 weeks (1st cycle; n = 50) and moulted hens after 10 months laying from 70 to 110 weeks of age (2nd cycle; n = 50). For the second experiment (for 8 months) in the 1st cycle 18 weeks old hens were bought (n = 60) and hens from the first experiment after moulting were used in the 2nd and 3rd cycle (n = 32 and n = 28). During the experiments eggshell qualitative parameters and calcium utilisation (%) were determined. The results indicate that the percentage of eggshell decreased with the increasing number of cycles. The significant correlation of the eggshell proportion and the age of hens was higher in long, advanced cycles (P < 0.05). The shell strength in both experiments decreased slightly in relation to the age of hens and repeated laying cycles. The shell deformation had an opposite trend to the shell strength, i.e. it increased with the increasing laying. The average shell thickness showed a decrease in the repeated laying cycles, more significant in shorter cycles (P < 0.01). The specific shell gravity maintained balanced values both in cycles and by the age of hens. The shell density in all cycles in both experiments showed a decreasing tendency in relation to the age of hens. In dietary calcium utilization for the shell formation a significant decrease was recorded in the second cycles after moulting (P < 0.05).https://cjas.agriculturejournals.cz/artkey/cjs-201002-0003_eggshell-quality-and-calcium-utilization-in-feed-of-hens-in-repeated-laying-cycles.phplaying hensforced moultingrepeated laying cycleeggshell qualitycalcium |
| spellingShingle | H. Arpášová M. Halaj P. Halaj Eggshell quality and calcium utilization in feed of hens in repeated laying cycles Czech Journal of Animal Science laying hens forced moulting repeated laying cycle eggshell quality calcium |
| title | Eggshell quality and calcium utilization in feed of hens in repeated laying cycles |
| title_full | Eggshell quality and calcium utilization in feed of hens in repeated laying cycles |
| title_fullStr | Eggshell quality and calcium utilization in feed of hens in repeated laying cycles |
| title_full_unstemmed | Eggshell quality and calcium utilization in feed of hens in repeated laying cycles |
| title_short | Eggshell quality and calcium utilization in feed of hens in repeated laying cycles |
| title_sort | eggshell quality and calcium utilization in feed of hens in repeated laying cycles |
| topic | laying hens forced moulting repeated laying cycle eggshell quality calcium |
| url | https://cjas.agriculturejournals.cz/artkey/cjs-201002-0003_eggshell-quality-and-calcium-utilization-in-feed-of-hens-in-repeated-laying-cycles.php |
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