|
KMID : 1025520080500030343
|
|
Journal of Animal Science and Technology
2008 Volume.50 No. 3 p.343 ~ p.354
|
|
|
Effects of Restricted Feeding during Growing Period on Growth and Endocrine Profile in Layers
|
|
Kang Hwan-Ku
Cho Jae-Hoon
Kim Ji-Hyuk
Kang Geun-Ho
Yu Dong-Jo
Na Jae-Cheon
Kim Dong-Wook
Lee Sang-Jin
Kim In-Shik
Kim Sang-Ho
|
|
|
Abstract
|
|
|
The objective of this study was to investigate the effect of restricted feeding to pullet on growth and endocrine profile in layers(Isa brown).
One thousand eighty brown-layer chicks were divided into three treatments; conventional feeding(ad libitum) and two restricted feedings(80% of conventional diet) for 70 weeks. One of restricted feeding started from seven to seventeen weeks of age, and the other started from twelve to seventeen weeks of age. Diets were formulated by NRC(1994) recommendation. Body weight and feed intake were measured every two weeks, and body composition and organ weight analyzed every week in rearing period and every eight weeks in laying period. Blood was collected at weighing body weight and was analyzed for the concentration of insulin-like growth factor-Ⅰand estradiol. Body weight and feed intake decreased as restriction of feeding begins comparing to ad libitum group(P<0.05), but reached to similar body weight and feed intake at 20 wk of age regardless of restriction. There were no significant differences in development of digestive tract and attached organs among the treatment groups. During rearing period, however, they were slightly higher in restricted group which was low in body weight. In terms of body composition, fat contents of restricted group were significantly lower(P<0.05) than that of ad libitum group around 1,000 grams of body weight. High concentration of IGF-Ⅰwas observed.
|
|
|
KEYWORD
|
|
|
Layers, Restricted feeding, IGF-Ⅰ, ad libitum
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
|
|