The Journal of Poultry Science
Online ISSN : 1349-0486
Print ISSN : 1346-7395
ISSN-L : 1346-7395

この記事には本公開記事があります。本公開記事を参照してください。
引用する場合も本公開記事を引用してください。

Effect of High Environmental Temperature on Egg Production, Serum Lipoproteins and Follicle Steroid Hormones in Laying Hens
Nami YoshidaMasanori FujitaMunehiro NakaharaTeppei KuwaharaShin-Ichi KawakamiTakashi Bungo
著者情報
ジャーナル フリー 早期公開

論文ID: 010126

この記事には本公開記事があります。
詳細
抄録

The aim of this study was to establish which aspect of egg production, plasma lipoproteins, preovulatory follicle steroid hormones in laying hens is altered by thermal environment. In experiment 1, Single Comb White Leghorn hens (80-90 wk of age) were exposed to three levels of environmental temperature by rotation (23, 27 and 31°C) for total 3 months, and feed intake, rectal temperature and egg production parameters were measured in each experimental period. In experiment 2, the hens (80 wk of age) were exposed to two levels of environmental temperature (23 and 31°C) for 7 days, and concentration of plasma lipoproteins and follicle steroid hormones were determined. Feed intake in hens exposed to 31°C significantly decreased compared with that at 23 and 27°C, and rectal temperature at 31°C was significantly higher than that at 23°C. In the egg production parameter, egg yolk density was significantly smaller at 27 and 31 than at 23°C. Finally, the concentrations of very low density lipoprotein in serum, and of estradiol 17-β and progesterone in follicles were adversely affected by environmental temperature at 31°C. These results suggest that high environmental temperature negatively influences both the lipoprotein and steroid hormones and consequently reduces egg production, but the reduction in feed intake is not the only reason for a decline in egg quality in laying hens.

著者関連情報
© 2011 by Japan Poultry Science Association
feedback
Top