The aim of this paper is to examine the egg production of commercial flock of light line hybrids
Lohmann Brown, as well as the influence of laying hen age on egg production intensity
of different egg weight groups, housed in conventional cage system. The examinations
were performed in the production conditions on the farm “Agrovet” in Foca, Bosnia and Herzegovina.
Since it is established that commercial flocks in egg production are kept until the end
of 72ⁿᵈ week of age (WA) as the final instance in production, the aim of this paper is to examine
what happens to production performance, ie laying intensity, after the established 72ⁿᵈ week of
laying hen age. In this paper, it is the period of seven weeks, until the 79ᵗʰ week of age of the
laying hen of the Lohmann Brown hybrid, where the production period lasted for 6I weeks, ie 427
days.
Based on the results of examination, it was concluded that egg production, as well as
laying intensity gradually increase to 27ᵗʰ week of age, when the maximum laying
intensity was reached, followed by gradual decline in egg production until the end of
the flock exploitation period, with occasional variations.
Analized by the weight groups, during 61 weeks of production, the slass M was the
most represented with a laying intensity of 47.47%, followed by the class L (31.64%),
class XL (3.12%) and then class S with 1.79%.
A positive coefficient of phenotypic correlation was determined between the age of laying hen
and laying intensity in all egg weight groups. It was statistically very highly
significant (p<0.001) until 36ᵗʰ week of age, highly significant between 36ᵗʰ and 42ⁿᵈ week of age
(p<0.01), and significant from 42ⁿᵈ to 52ⁿᵈ week of age (p<0.05).
