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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Faktory ovlivňující oplozenost násadových vajec v rodičovských chovech masného typu
 Volná, Šárka
COBB, ROSS and HUBBARD are the most popular broiler chicks produced in the Czech Republic. The thesis looks into conditions required for achieving the highest number of hatching eggs produced from the ROSS 308 and the COBB 500 broiler breeders. The aim of the study is to find out factors which may production of hatching eggs and how a one hour shorter lighting program affects egg production. Broiler breeders between 20 and 51 weeks of age were studied in terms of the feed amounts in relation to the female body weight and effect on egg production, in the course of the whole laying period. Two farms had been investigated in the study. The one hour shorter light program did not affect egg production up to 35 weeks of age. Birds kept on 13 hour lighting program produced significantly heavier eggs compared to the birds with 14 hour lighting program. Till the age of 35 weeks females with lower initial body weights laid more substandard eggs in comparison with the ones with higher body weights.
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Embryonální mortalita v průběhu inkubace u jednotlivých výchozích linií nosného typu slepic a u rodičovských hejn komerčních snáškových hybridů
 Zatloukal, Marek
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