Influence of different housing systems on the performance of hens of four laying strains
| Autor: | Mostert, Bernice E, Bowes, E.H., van der Walt, J.C. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | South African Journal of Animal Science; Vol 25, No 3 (1995); 80-86 |
| ISSN: | 0375-1589 2221-4062 |
| Popis: | Four laying strains were evaluated with regard to henday egg production, egg mass, feed conversion, mortality, Haugh units, shell thickness and percentage soiled, cracked and broken eggs produced under a battery, floor house and free-range system. This was done to determine whether significant differences do exist in performance between the different housing systems and to identify any stain x housing system interactions that may be present. Strain accounted for most variation in all the tested traits. Overall the battery system seemst o be more advantageousth an the other systems,y ielding a significantly higher henday egg production than the free-range system, a significantly higher egg mass than in the floor house system, a significantly better feed conversion than both the floor house and free-range systems, significantly less mortalities and less soiled, cracked and broken eggs than both the other systems. Strain x housing system interactions were observed with regard to feed conversion and mortality.Vier lOrassei s gegvalueert en opsigte van hendageierproduksiee, iermassa,v oeromset,m ortaliteit, Haugh-eenhede,d opdikte en persentasiev uil, gekraaktee n gebreektee iersv erkry vanaf 'n battery-,v loerhuis-e n veldkampstelsel.D it is gedoen om vas te stel of daar betekenisvollev erskille bestaani n prestasiet ussenv erskillendeb ehuisingstelselse n om enige ras x behuisingstelselinteraksiews at teenwoordigm ag wees,t e identifiseer.D ie meestev ariasiei n die gemetee ienskappew ord deur ras verklaar.I n die geheelb lyk die batterystelsevl oordeligert e weesa s die ander twee stelsels.' n Betekenisvolleh o0r hendageierproduksiew ord in die batterystelseal s in die veldkampbehuisingstelsevle rkry, 'n ho€r eiermassaa s in die vloerhuisstelsel,' n beter voeromseta s in albei die ander behuisingstelselsla, er mortaliteit en 'n laer persentasiev uil, gekraakte en gebreektee iers as in die vloerhuis- en veldkampbehuisingstelselsR.a s x omgewingbehuisingstelselinteraksieiss waargeneem ten opsigte van voeromset en mortaliteit.Keywords: Feed conversion, Haugh units, henday egg production, housing system, strain. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|