Document Detail

Reduction in age of puberty in gilts consuming melatonin during decreasing or increasing daylength.
MedLine Citation:
PMID:  1909309     Owner:  NLM     Status:  MEDLINE    
Two experiments were conducted to determine whether oral administration of melatonin alters the onset of puberty in gilts during naturally increasing or decreasing daylength. In Exp. 1, 20 crossbred prepubertal gilts weighing 77.5 +/- .5 kg at 171.8 +/- 1.0 d of age were assigned randomly to receive either a daily oral dose of 3 mg of melatonin (MEL) or ethanol vehicle (ETH) at 1530 from August 31 to December 1, 1987 (decreasing daylength). Gilts were exposed to mature boars for 20 min thrice weekly and blood samples were collected twice weekly. Serum concentrations of progesterone were used to establish age at puberty and length of estrous cycle. In Exp. 2, 20 crossbred prepubertal gilts weighing 67.7 +/- .7 kg at 143.8 +/- 1.1 d of age received either MEL or ETH treatment from February 1 to May 15, 1988 (increasing daylength). Age of puberty was less in gilts that received MEL than in gilts that received ETH in both Exp. 1 (198 +/- 3 vs 228 +/- 7 d; P less than .01) and Exp. 2 (183.8 +/- 2.7 d vs 194.3 +/- 3.3 d; P less than .05). Gilts that received MEL reached puberty at a lighter weight than gilts that received ETH in Exp. 1 (95.6 +/- 2.1 vs 112.4 +/- 3.9 kg; P less than .01) and Exp. 2 (88.1 +/- 1.5 vs 96.0 +/- 1.8 kg; P less than .01). Serum concentrations of LH and FSH, length of estrous cycles, and percentage of muscle of carcasses were similar between MEL and ETH gilts.(ABSTRACT TRUNCATED AT 250 WORDS)
M A Diekman; J A Clapper; M L Green; D K Stouffer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal science     Volume:  69     ISSN:  0021-8812     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  1991 Jun 
Date Detail:
Created Date:  1991-10-07     Completed Date:  1991-10-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2524-31     Citation Subset:  IM    
Dept. of Anim. Sci., Purdue University, West Lafayette, IN 47907.
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MeSH Terms
Estrus / drug effects,  radiation effects
Follicle Stimulating Hormone / blood
Luteinizing Hormone / blood
Melatonin / blood,  pharmacology*
Sexual Maturation / drug effects*,  radiation effects
Swine / growth & development,  physiology*
Weight Gain
Reg. No./Substance:
73-31-4/Melatonin; 9002-67-9/Luteinizing Hormone; 9002-68-0/Follicle Stimulating Hormone

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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