Effects of Dietary Levels of Vitamin a on the Egg Yield and Immune Responses of Laying Hens
Yükleniyor...
Dosyalar
Tarih
1998
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
POULTRY SCIENCE ASSOC INC
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
This research, which was designed and carried out as two consecutive experiments, investigated the effects of four different levels (0, 4,000, 12,000, and 24,000 IU/kg) of vitamin A supplementation on egg yield, plasma vitamin A levels, and immune responses of laying hens. Transmission of maternal immunity to their descendants was also studied. In the first experiment, egg yield, blood vitamin A levels, and various parameters of the immune system such as T lymphocyte levels in the peripheral blood, plasma cell counts in the spleen, and antibody titers against Newcastle Disease Virus (NDV) in the sera were investigated for a l-yr period. A total of 864 Hisex-brown laying hens were used in this experiment. The chicks were reared as commercial flocks until the 18th wk of age. No significant differences occurred among the parameters of the different diet groups. In the second experiment, maternal immunity was assessed in the chickens, supplied by hatching the eggs from hens in the first experiment. Maternal immunity was assayed by using the parameters as in Experiment 1. For this purpose, both blood and tissue samples were taken on the 2nd, 7th, and 10th d posthatch. Vitamin A supplementation had no significant effects on maternally, derived antibody titers or histologic structure of the lymphoid organs.
Açıklama
Anahtar Kelimeler
vitamin A, immunity, egg yields, antibody titers, T lymphocytes
Kaynak
Poultry Science
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
77
Sayı
4
Künye
Coşkun, B., İnal, F., Çelik, İ, Erganiş, O., Tiftik, A. M., Kurtoğlu, F., Kuyucuoğlu, Y., (1998). Effects of Dietary Levels of Vitamin A on the Egg Yield and Immune Responses of Laying Hens. Poultry Science, 77(4), 542-546. doi: 10.1093/ps/77.4.542