Original scientific paper

https://doi.org/10.18047/poljo.21.1.sup.46

EFFECT OF STARTING BODY FAT CONTENT OF LEGHORN-TYPE LAYING HENS ON THE CHANGES IN THEIR BODY FAT CONTENT, EGG PRODUCTION AND EGG COMPOSITION DURING THE FIRST EGG LAYING PERIOD

Eszter Szentirmai ; Kaposvár University, Faculty of Agricultural and Environmental Sciences, 7400 Kaposvár, Guba S. u. 40., Hungary (2) Zoltán Budai - Bábolna Tetra Ltd., 2943 Bábolna, Radnóti Miklós u. 16, Hungary
Gábor Milisits ; Kaposvár University, Faculty of Agricultural and Environmental Sciences, 7400 Kaposvár, Guba S. u. 40., Hungary (2) Zoltán Budai - Bábolna Tetra Ltd., 2943 Bábolna, Radnóti Miklós u. 16, Hungary
Tamás Donkó ; Kaposvár University, Faculty of Agricultural and Environmental Sciences, 7400 Kaposvár, Guba S. u. 40., Hungary (2) Zoltán Budai - Bábolna Tetra Ltd., 2943 Bábolna, Radnóti Miklós u. 16, Hungary
Jolán Ujvári ; Kaposvár University, Faculty of Agricultural and Environmental Sciences, 7400 Kaposvár, Guba S. u. 40., Hungary (2) Zoltán Budai - Bábolna Tetra Ltd., 2943 Bábolna, Radnóti Miklós u. 16, Hungary
Szilvia Áprily ; Kaposvár University, Faculty of Agricultural and Environmental Sciences, 7400 Kaposvár, Guba S. u. 40., Hungary (2) Zoltán Budai - Bábolna Tetra Ltd., 2943 Bábolna, Radnóti Miklós u. 16, Hungary
Gábor Bajzik ; Kaposvár University, Faculty of Agricultural and Environmental Sciences, 7400 Kaposvár, Guba S. u. 40., Hungary (2) Zoltán Budai - Bábolna Tetra Ltd., 2943 Bábolna, Radnóti Miklós u. 16, Hungary
Zoltán Sütő ; Kaposvár University, Faculty of Agricultural and Environmental Sciences, 7400 Kaposvár, Guba S. u. 40., Hungary (2) Zoltán Budai - Bábolna Tetra Ltd., 2943 Bábolna, Radnóti Miklós u. 16, Hungary

Abstract

The experiment was carried out with 60 TETRA BLANCA laying hens chosen from 250 TETRA BLANCA pullets based on their body fat content, predicted at 16 weeks of age by means of computer tomography (CT). Pullets with the highest (n=20), lowest (n=20) and average (n=20) body fat content were chosen for the investigation. Changes in the body fat content of the experimental animals were followed by means of computer tomography in vivo, scanning the hens at every fourth week of the experiment, between 20 and 72 weeks of age. Eggs produced by these birds, were collected at 32, 52 and 72 weeks of age and, after breaking them, their yolk, albumen and egg shell ratio was determined and their dry matter, crude protein and crude fat content was chemically analyzed. Based on the results it was established that the body fat content of the hens started the egg production with high body fat content being higher than that of the hens started the egg production with average or low body fat content during the whole experimental period. The differences in the body fat content of the two extreme groups were statistically proven between 24 and 48 weeks of age (P0.05) by the starting body fat content of the hens.

Keywords

hen; body fat; egg production; egg composition; computer tomography

Hrčak ID:

150919

URI

https://hrcak.srce.hr/150919

Publication date:

2.9.2015.

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