Journal of Food, Agriculture and Environment




Vol 12, Issue 1,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255


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


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


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