High follicle density does not decrease sweat gland density in Huacaya alpacas

Moore, Kelsie; Maloney, Shane K.; Blache, Dominique

doi:10.1016/j.jtherbio.2014.10.009

Cited by 13 publications

(4 citation statements)

References 28 publications

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“…Monitoring possible negative effects of reducing medullation on thermoregulation should be also recommended given that greater heat losses have been found in alpaca samples of finer fiber under the same fiber DE, but this effect seems to be counterbalanced by a higher DE of finer fleeces (Moore et al, 2015). Moreover, management improvements are also expected that will help in the maintenance of animals under better climatic conditions.…”

Section: Discussionmentioning

confidence: 99%

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: 99%

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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“…Primary follicles are smaller in diameter than secondary follicles, and secondary follicles are associated with sweat glands. Younger animals with finer, denser fiber could have lower absorptive capacity than older animals with less dense fiber (Moore, Maloney, & Blache, ). The median bioavailability of fentanyl in alpacas (35.5% (range 27–64%) we studied was lower than that observed in horses.…”

Section: Discussionmentioning

confidence: 99%

Pharmacokinetics of intravenous and transdermal fentanyl in alpacas

Lovasz

Aarnes

Hubbell

et al. 2017

Vet Pharm & Therapeutics

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The purpose of the study was to determine pharmacokinetics of fentanyl after intravenous (i.v.) and transdermal (t.d.) administration to six adult alpacas. Fentanyl was administered i.v. (2 μg/kg) or t.d. (nominal dose: 2 μg kg hr ). Plasma concentrations were determined using liquid chromatography-mass spectrometry. Heart rate and respiratory rate were assessed. Extrapolated, zero-time plasma fentanyl concentrations were 6.0 ng/ml (1.7-14.6 ng/ml) after i.v. administration, total plasma clearance was 1.10 L hr kg (0.75-1.40 L hr kg ), volumes of distribution were 0.30 L/kg (0.10-0.99 L/kg), 1.10 L/kg (0.70-2.96 L/kg) and 1.5 L/kg (0.8-3.5 L/kg) for V , V , and V , respectively. Elimination half-life was 1.2 hr (0.5-4.3 hr). Mean residence time (range) after i.v. dosing was 1.30 hr (0.65-4.00 hr). After t.d. fentanyl administration, maximum plasma fentanyl concentration was 1.20 ng/ml (0.72-3.00 ng/ml), which occurred at 25 hr (8-48 hr) after patch placement. The area under the plasma fentanyl concentration-vs-time curve (extrapolated to infinity) after t.d. fentanyl was 61 ng*hr/ml (49-93 ng*hr/ml). The dose-normalized bioavailability of fentanyl from t.d. fentanyl in alpacas was 35.5% (27-64%). Fentanyl absorption from the t.d. fentanyl patch into the central compartment occurred at a rate of approximately 50 μg/hr (29-81 μg/hr) between 8 and 72 hr after patch placement.

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“…De este modo se ha podido constatar que luego del descerdado, aunque existen diferencias del peso de fibra fina, fibra gruesa e impurezas por efecto del estrato etáreo (p<0,01), sin embargo el rendimiento de fibra fina, fibra gruesa e impureza resultan proporcionalmente similares entre animales juveniles y adultos (figura 1), resultado que es similar a lo encontrado por Cochi (1999). De este modo podemos indicar que el crecimiento en longitud y diámetro de fibra fina y la fibra gruesa se genera en una similar proporción, vale decir que aunque las fibras gruesas crecen más longitudinal y transversalmente que las fibras finas, pero como en cantidad es inferior a las fibras finas, la proporción de las fracciones se mantienen (Moore et al, 2015), como consecuencia que el aporte de nutrientes a nivel de los folículos pilosos de dichas fibras también resulta ser proporcional a la cantidad y grosor de las fibras (Galbraith, 2010).…”

Section: Discussionunclassified

Efecto del forraje sobre el rendimiento piezas de la canal y perfil hematológico de conejos destetados

2015

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Veinte conejos destetados, de peso inicial entre 667,49 y 678,80 g, fueron aleatoriamente asignados a cinco tratamientos (A, B, C, D, y E) en un diseño completamente al azar con cuatro repeticiones de un conejo. La dieta A (concentrado) sirvió como dieta control. Las dietas B y C se compusieron de forraje fresco de pasto elefante y de Tridax respectivamente; la dieta D fue una mezcla de forraje Tridax:Pueraria (60:40) y la E una mezcla de pasto elefante:Pueraria (60:40). El nivel de fibra bruta en Tridax (12,42 %), pasto elefante (33,59 %) y Pueraria (39,75 %) fue mayor que el del concentrado (5,89 %). El extracto etéreo en el concentrado (4,13 %) es comparable al de Tridax (6,14 %) y pasto elefante (2,35 %)e inferior al de Pueraria (11,10 %). El contenido de cenizas en el concentrado (6,12 %) es comparable al de los forrajes excepto Tridax (2,02 %). La ingestión de la dieta A es comparable a la de la D pero significativamente mayor que la de las otras dietas, tendencia que continúa semanalmente en lo relativo a la ganancia diaria y total de peso. La ingestión de materia seca de la dieta A es similar a la de la dieta D pero significativamente menor que en los restantes tratamientos. Los índices de conversión de las dietas A (3,66), D (3,73) y E (3,62) son significativamente menores (p

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High follicle density does not decrease sweat gland density in Huacaya alpacas

Cited by 13 publications

References 28 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

Pharmacokinetics of intravenous and transdermal fentanyl in alpacas

Efecto del forraje sobre el rendimiento piezas de la canal y perfil hematológico de conejos destetados

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