Melatonin and fleece growth in Australian cashmere goats

Klören, W. R.L. and Norton, B. W. (1995) Melatonin and fleece growth in Australian cashmere goats. Small Ruminant Research, 17 2: 179-185. doi:10.1016/0921-4488(95)00659-9


Author Klören, W. R.L.
Norton, B. W.
Title Melatonin and fleece growth in Australian cashmere goats
Journal name Small Ruminant Research   Check publisher's open access policy
ISSN 0921-4488
Publication date 1995-01-01
Sub-type Article (original research)
DOI 10.1016/0921-4488(95)00659-9
Open Access Status Not yet assessed
Volume 17
Issue 2
Start page 179
End page 185
Total pages 7
Language eng
Subject 3403 Food Animals
1103 Animal Science and Zoology
Abstract Three groups each of eight Australian cashmere goats (four males, four females, 10 months old) were implanted at the base of the ear with melatonin pellets (18 mg) between July and October (July group), January and April (January group), or sham implanted (control). Cashmere and hair length changes were measured during the year following implantation. Rates of growth, maximum length, initiation and cessation dates of cashmere growth were calculated from cumulative cashmere length measurements. All goats were maintained on pasture under natural daylight. Control goats showed the normal circannual pattern of growth: no growth from July until the cycle was initiated, on average, on 9 November 1988 and ceased on 27 May 1989 (199 days). Implantation in July permitted the continuation of cashmere growth until 1 November 1988, and this extended cycle was followed by another cycle of short duration (146 days) with initiation (26 January 1989) and cessation (21 June 1989) dates later than those of controls. Hair growth patterns also changed during this period. Implantation with melatonin in January reduced maximum fleece length (59 mm) compared with controls (72 mm) by induction of an early cessation of cashmere growth (3 May 1989). There were no differences (P < 0.05) between sexes in response to treatments. Melatonin implants in July (short days) partially suppressed a rise in blood prolactin concentrations in October, and implants in January (long days) resulted in prolactin levels similar to those found in short days. Melatonin implants had no effect on serum thyroxine concentrations. Results suggest that melatonin implants at strategic times of the year may be a practical method for increasing cashmere production from young goats.
Keyword Cashmere
Fleece
Goat
Melatonin
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Fri, 05 Jan 2018, 04:47:39 EST