- With the increased interest in the measurement of fleece samples from alpacas, a number of questions have been raised concerning the meaning of mean fibre curvature on these samples. Whilst some information has been published, there appear to be some divergent views expressed on the importance of this measurement. This bulletin is intended to impart some factual information which may be useful to growers trying to understand the measurement. more »
- Softness of apparel textiles is a major attribute sought by consumers. There is surprisingly little objective information on the softness properties of rare animal fibres, particularly cashmere, alpaca and mohair. Samples of these and other rare animal fibres from different origins of production and processors were objectively measured for fibre diameter, fibre curvature (FC, crimp) and resistance to compression (softness). While there were curvilinear responses of resistance to compression to FC and to mean fibre diameter, FC accounted for much more of the variance in resistance to compression. Fibre type was an important determinant of resistance to compression. The softest fibres were alpaca, mohair and cashgora and all of the fibres measured were softer than most Merino wool. Quivet, llama, camel, guanaco, vicuña, yak wool, bison wool, dehaired cow down and Angora rabbit were also differentiated from alpaca, mohair and cashmere. There were important differences in the softness and FC of cashmere from different origins with cashmere from newer origins of production (Australia, New Zealand and USA) having lower resistance to compression than cashmere from traditional sources of China and Iran. Cashmere from different origins was differentiated on the basis of resistance to compression, FC and fibre diameter. Cashgora was differentiated from cashmere by having a lower FC and lower resistance to compression. There were minority effects of colour and fibre diameter variation on resistance to compression of cashmere. The implications of these findings for the identification and use of softer raw materials are discussed. more »
- The Alpaca Across-herd Genetic Evaluation (AGE) project has successfully established a most important genetic improvement tool for a commercial livestock industry. This report describes this achievement and its importance to rapid genetic improvement in the alpaca industry. This research is of benefit primarily to Australian and New Zealand alpaca breeders to show them the progress achieved with the establishment of an Alpaca Across-herd Genetic Evaluation system and to encourage them to enter their alpacas into the AGE system. An AGE commercial service has been established for the Australian alpaca industry. This service is a world first for the alpaca industry. In the analysis of March 2008 there were 100 herds, 1879 progeny and 3872 alpacas. more »
- The quality and quantity of alpaca fibre is affected by not only the body condition and nutrition of the animal but also by season and sex hormones. These factors can interact with the genetic potential of each animal to such an extent that they can mask the true genetic value of an animal. This RIRDC report provides scientific data that can be used by producers, consultants to the industry, and feed manufacturers to design more appropriate diets and feeding strategies that will allow the industry to make genetic progress because these management procedures will decrease the impact of nutritional and environmental factors on the expression of the animal’s genetic potential for fibre production. more »
- Some alpacas maintain fine fibre throughout life, while others suffer from significant coarsening of fibre as they age, a trait known as micron blowout. Micron blowout results in reduced productivity, through reduced yield of high quality fibre over the life of an animal. Data from a well-established alpaca herd in Peru was used in a complex quantitative genetics analysis to determine if genetics plus environment, or environment alone was responsible for micron blowout in alpacas. This project has shown that micron blowout has a moderate heritability in alpacas, and that selection against micron blowout would be successful in reducing the extent of the problem. This report is targeted at Australian alpaca breeders. more »