Measurement of the components of the cashmere growth cycle in Australian cashmere goats

Norton B.W. and Kloren W.R.L. (1995) Measurement of the components of the cashmere growth cycle in Australian cashmere goats. Small Ruminant Research, 17 3: 263-268. doi:10.1016/0921-4488(95)00660-D


Author Norton B.W.
Kloren W.R.L.
Title Measurement of the components of the cashmere growth cycle 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)00660-D
Open Access Status Not yet assessed
Volume 17
Issue 3
Start page 263
End page 268
Total pages 6
Subject 1103 Clinical Sciences
3403 Food Animals
Abstract Seasonal growth and shedding of cashmere fibre makes total fleece weight measurements difficult to interpret in relation to environmental and experimental variables. In studies of the effects of nutrition and photoperiod on cashmere growth, a technique has been developed which provides statistically analysable values for growth rates, maximum fibre length, length of growing period, and for dates of initiation and cessation of cashmere fibre growth. This method requires the measurement of cashmere length at monthly intervals at three sites (shoulder, midside and hip) on the goat. The model assumes that once initiated, the rate of cashmere length increase was linear until cessation, and that the initiation of growth occurs at a fixed time controlled by photoperiod. This paper provides a method for quantitative estimation of the dates of initiation and cessation of fibre growth, and for determining the linear rates of cashmere and hair fibre growth. The method involves the measurement of cashmere fibre length at 28 day intervals over the period of growth, and calculation of rate of cashmere growth from the linear portion of the graph relating length and date of sampling. Extrapolation of this line to time 0 provides an estimate of initiation date. Cessation date is then calculated as the date where maximum length observed intersects this linear plot, and the period of growth estimated as the difference between initiation and cessation dates. This simple model was found to closely fit observed data from individuals or groups of goats and, with the appropriate measures of variation, permits statistical comparisons of these values between individuals or groups.
Keyword Cashmere
Fleece growth
Goat
Photoperiod
Season
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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