Estimation of genetic parameters for reproductive traits in alpacas

Cruz, Alan; Cervantes, I.; Burgos, A.; Morante, R.; Gutiérrez, Juan Pablo

doi:10.1016/j.anireprosci.2015.09.017

Cited by 12 publications

(10 citation statements)

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“…Likewise, current ongoing selection can be carrying consequences in preweaning traits. Main selection objectives in alpacas are related to fiber production (Wuliji et al, 2000;Quispe et al, 2009;Gutiérrez et al, 2009 andCervantes et al, 2010;Paredes et al, 2014;Cruz et al, 2015), and genetic correlations between fiber and preweaning traits (Table 4) suggest that selecting for meat production would bring about animals with greater weight and size, this leading to coarsening the fiber increasing the diameter and loosing comfort factor, particularly in Huacaya, Table 5 Direct and maternal genetic correlation and their corresponding standard errors (in brackets) for preweaning and morphological traits in Huacaya and Suri variant but also in a lesser extent in Suri. The influence of the live weight and subjective conformation traits on wool traits had already been reported in sheep (Matebesi et al, 2009a and2009b).…”

Section: Discussionmentioning

confidence: 99%

“…Finally, although correlations were low, it could be considered worrying that genetic correlations between SW and morphological traits were most of them unfavorable, given that selecting to improve morphology would bring about lower survival. Cruz et al (2015) have recently established the genetic parameters for several reproductive traits as well as their genetic correlations with fiber and morphological traits, and they concluded the relevance of age at first calving and calving interval because of the magnitude of their heritabilities and their genetic correlations with productive traits. Genetic correlations between preweaning and reproductive traits were more relevant in Suri, with the highest genetic correlations in absolute value found in birth traits, unlike in Huacaya in which the most relevant genetic correlations were found for weaning traits (Table 6).…”

Section: Discussionmentioning

confidence: 99%

“…(a) Reproductive traits as described by Cruz et al (2015): Age at first calving as the age in days of the mother when her first birth and calving interval as the time in days between two consecutive births. (b) Fiber traits as described by Gutiérrez et al (2009) and Cervantes et al (2010): fiber diameter (FD), comfort factor (CF) this is defined as the percentage of fiber with <30 μm, standard deviation of FD (SD) and coefficient of variation of FD (CV).…”

Section: Datamentioning

confidence: 99%

“…Peru is the largest country in the world breeding alpacas, with a population over 3.5 million of animals, because of that, the government has approved many regulations in order to promote alpaca show fairs and production of quality fiber, but the best animals in morphological competitions are not always the best animals producing fiber (Cervantes et al, 2010;Cruz et al, 2015). As a consequence there might be low genetic improvement due to the possible low or null genetic correlations between the criteria used to choose the best morphological and productive animals.…”

Section: Introductionmentioning

confidence: 99%

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Genetic parameters estimation for preweaning traits and their relationship with reproductive, productive and morphological traits in alpaca

Cruz¹,

Cervantes

Burgos³

et al. 2017

Animal

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The aim of this study was to estimate the genetic parameters for preweaning traits and their relationship with reproductive, productive and morphological traits in alpacas. The data were collected from 2001 to 2015 in the Pacomarca experimental farm. The data set contained data from 4330 females and 3788 males corresponding to 6396 and 1722 animals for Huacaya and Suri variants, respectively. The number of records for Huacaya and Suri variants were 5494 and 1461 for birth weight (BW), 5429 and 1431 for birth withers height (BH), 3320 and 896 for both weaning weight (WW) and average daily gain (DG) from birth to weaning, 3317 and 896 for weaning withers height (WH), and 5514 and 1474 for survival to weaning. The reproductive traits analyzed were age at first calving and calving interval. The fiber traits were fiber diameter (FD), standard deviation of FD (SD), comfort factor and coefficient of variation of FD and the morphological traits studied were density, crimp in Huacaya and lock structure in Suri, head, coverage and balance. Regarding preweaning traits, model of analysis included additive, maternal and residual random effects for all traits, with sex, coat color, number of calving, month-year and contemporary group as systematic effects, and age at weaning as linear covariate for WW and WH. The most relevant direct heritabilities for Huacaya and Suri were 0.50 and 0.34 for WW, 0.36 and 0.66 for WH, 0.45 and 0.20 for DG, respectively. Maternal heritabilities were 0.25 and 0.38 for BW, 0.18 and 0.32 for BH, 0.29 and 0.39 for WW, 0.19 and 0.26 for WH, 0.27 and 0.36 for DG, respectively. Direct genetic correlations within preweaning traits were high and favorable and lower between direct and maternal genetic effects. The genetic correlations of preweaning traits with fiber traits were moderate and unfavorable. With morphological traits they were high and positive for Suri but not for Huacaya and favorable for direct genetic effect but unfavorable for maternal genetic effect with reproductive traits. If the selection objective was meat production, the selection would have to be based on the direct genetic effect for WW but not on the maternal genetic effect that has been shown to have less relevance. Other weaning traits such as WH or DG would be indirectly selected.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Genetic parameters estimation for preweaning traits and their relationship with reproductive, productive and morphological traits in alpaca

Cruz¹,

Cervantes

Burgos³

et al. 2017

Animal

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“…The selection for decreasing the alpaca FD has been extremely successful with an important genetic progress (Gutiérrez et al, 2009;Cervantes et al, 2010;Gutiérrez et al, 2011;Gutiérrez et al, 2014;Cruz et al, 2015 and2017) without worsening other traits. Therefore, selection against medullation is expected to also have success depending on the magnitude of the concerned genetic parameters.…”

Section: Introductionmentioning

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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Effect of the gestation and lactation on fiber diameter and its variability in Peruvian alpacas

Cruz¹,

Morante²,

Cervantes

et al. 2017

Livestock Science

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Estimation of genetic parameters for reproductive traits in alpacas

Cited by 12 publications

References 32 publications

Genetic parameters estimation for preweaning traits and their relationship with reproductive, productive and morphological traits in alpaca

Genetic parameters estimation for preweaning traits and their relationship with reproductive, productive and morphological traits in alpaca

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

Effect of the gestation and lactation on fiber diameter and its variability in Peruvian alpacas

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