The aim of the thesis was to evaluate productivity of the final hybrids laying type of hens Isa Brown and Bovans Brown in different housing systems on the basis of data provided by the International Poultry Testing Station in Ústrašice. Monitoring performance of the final hybrid laying type hens consisted of rearing pullets until the age of 126 days and the laying period to 518 days of age. Hatching eggs of Isa Brown hybrid for keeping in cages had significantly higher weight and fertilization, but lower hatchability of fertilized eggs than for keeping on litter. Hybrid Bovans Brown eggs for hatching intended for keeping in cages had lower weight and lower fertilization and hatching rate of fertilized eggs than eggs for keeping on litter. At the end of 18th week of rearing of pullets Isa Brown and Bovans Brown reared in cages had significantly lower body weight compared to pullets reared on litter. In pullets housed in cages feed consumption in 126 days was significantly higher compared with pullets reared on litter. During the rearing of pullets mortality was not recorded. Hybrid Isa Brown showed a higher body weight if kept in cages while hybrid Bovans Brown on litter. Both hybrids in battery cages had lower feed consumption per 1 egg and 1 feeding day. For the observed period was found higher mortality in chickens kept in cages than on litter. Hens housed in cages had lower egg production at the initial state. Both hybrids housed in cages had significantly lower intensity of laying during the first period than the laying hens housed on litter. Differences in the 2nd laying period were slight. Hens housed in battery cages achieved the highest egg weight in the mid-laying cycle, i.e. in the 7th the laying period. Conversely hen housed on litter achieved the highest egg weight at the end of the laying cycle, and 13th, respectively 14th the laying period. Shell strength gradually decreased with age in both housing systems.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:320602 |
| Date | January 2017 |
| Creators | FARA, Jiří |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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