The relationship between the incidence of medullated fibres in mohair and live weight over the lifetime of Angora goats

McGregor, B. A.; Butler, K. L.; Ferguson, M.B.

doi:10.1016/j.smallrumres.2013.02.007

Cited by 10 publications

(1 citation statement)

References 15 publications

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“…Table 1 shows also an enormous PM variability, from 0% to 100% in both genetic types, variability not present in other species. Thus, for instance, the PM was between 0.1% and 4.6% in Angora goats (McGregor et al, 2013;Taddeo et al, 2000), between 0% and 5.1% in cashmere goats (McGregor, 2014), up to 23.52% in sheep wool (Cilek, 2015), and between 35.5% and 46.6% in lamas (Martinez et al, 1997) with enormous variability (Frank et al, 2006). In fact, there have been found animals with high PM in all the diameter rank in the data.…”

Section: Discussionmentioning

confidence: 85%

Genetic parameters for medullated fiber and its relationship with other productive traits in alpacas

Cruz¹,

Morante²,

Gutiérrez

et al. 2019

Animal

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The alpaca fiber diameter (FD) varies from 18 to 36 μm, being the finer fiber categories highly appreciated. However, the alpaca fiber presents some limitations in the textile industry due to the high incidence of fiber medullation and diameter variability, both reduces the comfort feeling of the garments. Decreasing or even removing medullation could be a possible selection objective in alpaca breeding programs for increasing economic value of the alpaca fiber. Therefore, the present work aimed to estimate genetic parameters regarding medullation traits, as well as the genetic correlations with other economical important traits, to be able to select the appropriate criteria to reduce or remove medullation on alpaca fiber and help to reduce the prickle factor in the garments. The data was collected from 2000 to 2017 and belonged to the Pacomarca experimental farm. There were 3698 medullation records corresponding to 1869 Huacaya and 414 Suri genetic types. The fiber samples were taken from the mid side, and were analyzed in an OFDA 100® device. The traits analyzed were percentage of medullation (PM), medullated fiber diameter (MFD), FD, standard deviation of FD, greasy fleece weight as fiber traits; density, crimp in Huacaya and lock structure in Suri, head conformation, leg coverage as morphological traits; weaning weight and age at first calving as secondary and functional traits. Genetic parameters were estimated via a multitrait restricted maximum likelihood. The heritabilities for PM and MFD were 0.225 and 0.237 in Huacaya genetic type and 0.664 and 0.237 in Suri genetic type, respectively; heritabilities for other traits were moderate for productive and morphological traits, and low to moderate for secondary and functional traits. The genetic correlations PM–FD and MFD–FD were high and favorable in both genetic types, between 0.531 and 0.975; the genetic correlation PM–MFD was 0.121 in Huacaya and 0.427 in Suri. The rest of genetic correlations with other traits were in general moderate and favorable. The repeatabilities were 0.556 and 0.668 for PM, and 0.322 and 0.293 for MFD in Huacaya and Suri genetic types, respectively. As a conclusion, PM was identified to be a good selection criterion, probably combined in an index with FD to reduce prickling factor.

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Section: Discussionmentioning

confidence: 85%

Genetic parameters for medullated fiber and its relationship with other productive traits in alpacas

Cruz¹,

Morante²,

Gutiérrez

et al. 2019

Animal

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Spinning Angora Rabbit Wool‐Like Porous Fibers from a Non‐Equilibrated Gelatin/Water/2‐Propanol Mixture

Stoessel

Grass

Sánchez‐Ferrer

et al. 2013

Adv Funct Materials

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Due to their porous structure, angora rabbit fibers make for some of the highest quality wool. The application of these fibers on a technical scale is not feasible due to their limited availability and high price. Here, a robust fiber preparation method is reported based on an unusual spinning process, where a non‐equilibrated, ternary system of protein, solvent, and non‐solvent is continuously processed into strong fibers with minimal energy input and harmless solvents. Gelatin—the degradation product of collagen—is chosen as the protein component because of its immense availability from slaughterhouse waste. Due to the sponge‐like structure of the ternary gelatin/water/2‐propanol spinning mixture, fibers with internal cavities are produced. The porous nature of these fibers resembles the morphology of angora rabbit fibers. Despite their high porosity, the here‐obtained gelatin fibers show clear re‐orientation of the fibrous protein and attain a mechanical performance similar to other bio‐ (e.g., wool, tendon collagen) and synthetic polymers (e.g., polytetrafluoroethylene, polyamide 6). These promising results motivate for broader investigations on the spinning of non‐equilibrium protein mixtures and suggest the use of porous gelatin fibers in textiles.

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Physical, chemical, and tensile properties of cashmere, mohair, alpaca, and other rare animal fibers

McGregor

2018

Handbook of Properties of Textile and Technical Fibres

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The relationship between the incidence of medullated fibres in mohair and live weight over the lifetime of Angora goats

Cited by 10 publications

References 15 publications

Genetic parameters for medullated fiber and its relationship with other productive traits in alpacas

Genetic parameters for medullated fiber and its relationship with other productive traits in alpacas

Spinning Angora Rabbit Wool‐Like Porous Fibers from a Non‐Equilibrated Gelatin/Water/2‐Propanol Mixture

Physical, chemical, and tensile properties of cashmere, mohair, alpaca, and other rare animal fibers

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