Journal of Food, Agriculture and Environment

Changes in follicle stimulating hormone, luteinizing hormone, progesterone, and estradiol-17 β in laying hens under different photoperiod

Author(s):

Hui Chen ¹*, Ke-qian Di ^{1, 2}*, Kang Bai ¹*, Lihua Li ¹, Shuai Ge ¹, Ren-lu Huang ¹**

Recieved Date: 2013-09-21, Accepted Date: 2014-01-13

Abstract:

This paper is concerned with the Changes of follicle stimulating hormone, luteinizing hormone, progesterone, and estradiol-17β in laying hens under different photoperiods. Two hundred and fifty six commercial egg-type pullets were initially exposed to a photoperiod of 23 h of light (L ):1 h of darkness (D), which was reduced to 22L:2D at 1 wk, to 18L:6D at 2 wk and to 16L:8D at 3 wk. From 4 to 20 wk, the photoperiod was 8L:16D. From 20wk, each week increased one hour to achieve 11L:13D, 13L:11D, 15L:9D and 17L:7D photoperiods respectively. At 29weeks, two chickens were randomly selected from each replication, in order to detect the concentrations and patterns of FSH, LH, P₄ and E₂. Similar patterns of preovulatory LH and P₄ surges and E₂ levels were observed in 11L:13D, 13L:11D, 15L:9D and 17L:7D photoperiods. Preovulatory surges of FSH, LH and P₄ were associated with spontaneous ovulations, but surges of E₂ were not detected. In additions, the hormone concentrations were not increasing with the longer photoperiod, concentration of FSH, LH, P₄ and E₂ in 11L:13D photoperiod was the highest (P<0.01). According to the time of P₄ peak amplitude, we could predict the laying time, oviposition often occrued 2~4 h after appearing the peak amplitude.

Keywords:

Photoperiod, laying hen, hormone

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Journal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 1
Category: Agriculture
Pages: 248-250

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