Abstract
The paper examined the incidence of different forms of feather loss and cannibalism in laying hens aged 74 weeks following moulting and in laying hens following exploitation for a period of one year. The forms of feather loss were considered in detail through a repeated examination of video recordings and they were sorted according to localization - to feather loss on the ventral part of the neck, on the dorsal part of the neck, and on the back between the wings. Feather loss on the ventral part of the neck was established in 47.9% hens, and in the dorsal part in 16.77% hens of the 167 laying hens aged 74 weeks following moulting. The group of 129 laying hens that were observed following one-year exploitation exhibited considerably more frequent feather loss, in 96.90% hens it was localized on the ventral part of the neck, in 60.47% hens on the dorsal part of the neck, and in 20.16% hens it was localized on the back between the wings. A comparison of the results of the incidence of co localized forms of feather loss in the one and the other group of laying hens using the t-test showed statistically very significant differences. A detailed consideration of the video recordings using the method of sequence analysis did not reveal any cannibalism in either group of laying hens.
Highlights
Gubitak perja na ventralnom delu vrata ustanovljen kod 47,9 posto koko{i, a na dorzalnom delu vrata kod 16,77 posto koko{i od ukupno 167 nosilja u uzrastu od 74 nedelje posle mitarenja
U grupi koko{i uzrasta od 62 nedelje ustanovljeno je znatno u~estalije pojavljivanje gubitaka perja, i to kod 96,90 posto koko{i lokalizovanih na ventralnom delu vrata, kod 60,47 posto koko{i na dorzalnom delu vrata i 20,16 posto koko{i na le|ima izme|u krila;
Detaljnim razmatranjem video zapisa primenom metode sekvencionalne analize nije uo~ena pojava kanibalizma kod obe grupe koko{i nosilja; i
Summary
Gubitak perja na ventralnom delu vrata ustanovljen kod 47,9 posto koko{i, a na dorzalnom delu vrata kod 16,77 posto koko{i od ukupno 167 nosilja u uzrastu od 74 nedelje posle mitarenja. U na{oj zemlji ne postoje podaci u literaturi o sistematskom pra}enju u~estalosti pojavljivanja, manifestacija pojavnih oblika, uzroka i posledica gubitaka perja kod koko{i nosilja, kako u intenzivnim, tako i u ekstenzivnim sistemima gajenja. Imaju}i u vidu navedeno postavljeni su osnovni ciljevi u ovom radu koji su obuhvatili prou~avanje u~estalosti pojavljivanja, manifestacija, uzroka i posledica gubitaka perja kod koko{i nosilja u konvencionalnim kavezima na jednoj farmi u na{oj zemlji sa intenzivnim sistemom gajenja.
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