Effect of breed and age of general-purpose hens on egg quality.
PBN-AR
Instytucja
Instytut Zootechniki - Państwowy Instytut Badawczy
Książka
Tytuł książki
Wrocław Banff Egg Forum - Egg: bioactive treasure
Data publikacji
2014
ISBN
9788377171851
Wydawca
Wydawnictwo Uniwersytetu Przyrodniczego we Wrocławiu
Publikacja
Główny język publikacji
EN
Tytuł rozdziału
Effect of breed and age of general-purpose hens on egg quality.
Rok publikacji
2014
Strony (od-do)
41-41
Numer rozdziału
Link do pełnego tekstu
Identyfikator DOI
Liczba arkuszy
0.09
Hasło encyklopedyczne
Autorzy
Konferencja
Indeksowana w Scopus
nie
Indeksowana w Web of Science Core Collection
nie
Liczba cytowań z Web of Science Core Collection
Nazwa konferencji (skrócona)
Nazwa konferencji
Wrocław Banff Egg Forum. Egg: Bioactive Treasure
Początek konferencji
2014-06-25
Koniec konferencji
2014-06-27
Lokalizacja konferencji
Wrocław
Kraj konferencji
PL
Lista innych baz czasopism i abstraktów w których była indeksowana
Open access
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Streszczenia
Język
EN
Treść
The experiment used eggs from general-purpose Rhode Island Red (K-66), Barred Rock (D-11 and WJ-44) and New Hampshire (N-11) hens, laid at the start, peak and end of egg production. At 22, 32 and 53 weeks of age, 20 eggs were randomly selected from each genetic group to perform egg weight, shape index, yolk weight and colour, quality of thick albumen (height and Haugh units), and shell colour, weight, strength, thickness and density. In addition, egg albumen, yolk percentage and shell percentage were determined for each group. The results were analysed statistically using analysis of variance and Duncan’s test. The aim of the study was to determine the egg quality obtained from local, protected genetic varieties of hens. The study showed a significant effect of genetic origin and age of layers on physicochemical characteristics of eggs. Breed of layers determined egg shape and colour and yolk weight and colour. Age of layers had a significant effect on most interior egg and eggshell traits by determining egg weight, shape and colour, shell weight and strength, as well as thick albumen quality and yolk weight and colour. As hens grew older, their eggs became increasingly heavy and rounded. Shell colour, which became significantly lighter at the peak of lay, was darker at the end of the production period compared to the point of lay (P?0.01). Shell weight and density increased as hens aged, but shell thickness remained unchanged. Nevertheless, shell strength was observed to deteriorate in all genetic groups of hens towards the end of the production period. Age of hens also had a negative effect on thick albumen quality, as reflected in lower Haugh units between the point of lay and end of lay. Yolk weight and percentage increased significantly with the age of the layers. A reverse, statistically significant tendency was noted for albumen. Age of hens also contributed to shell percentage in eggs, with the lowest values of this parameter being found at the peak of lay. The study also demonstrated a significant interaction between genetic group and age of layers within this trait. Apart from layer age, egg yolk and albumen percentage also depended on the genetic origin of the birds. The present study suggests that local populations of general-purpose hens can be a source of table eggs, however, the laying performance and the quality of eggs obtained from them depends of the age and genetic origin of birds.
Cechy publikacji
Doniesienie-naukowe-na-konferencję
Inne
System-identifier
4999