Estimación de heredabilidad de la curva de crecimiento en el borrego de raza Chiapas en México

Méndez-Gómez, A.C.; López-Ordaz, Rufino; Peralta-Lailson, Marisela; Ullóa-Arvízu, Raúl; Pedraza-Villagómez, Pastor; Ruiz-López, F.J.; Berruecos-Villalobos, José Manuel; Vásquez-Peláez, Carlos

doi:10.1017/s2078633613000519

Cited by 2 publications

(2 citation statements)

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“…For the parameter k, the heritability was high (0.60) in both models. These results are similar to those estimated by Bathaei and Leroy (1998) for Mahraban Iranian sheep, but higher than the results presented by other studies Abegaz et al, 2010;Méndez-Gomez et al, 2014). If these results are translated to their biological meaning, we could interpret the asymptotic weight (a) and the maturing rate (k ) showing important levels of additive variability, which implies an interesting suitability for selection.…”

Section: Resultssupporting

confidence: 87%

“…With regard to the heritability (h 2 ) estimates for the inflection point, the estimates obtained for weight and age at the inflection point in the current study were moderate (0.41 for both with the logistic model and 0.38 and 0.46, respectively, with the Verhulst model); for weight inflexion, it was higher than the results presented by Méndez-Gomez et al (2014) in their study of Chiapas lambs, but lower for the inflexion age.…”

Section: Resultscontrasting

confidence: 83%

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Genetic parameters of traits associated with the growth curve in Segureña sheep

Lupi

León²,

Nogales

et al. 2016

Animal

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This paper studies the genetic importance of growth curve parameters and their relevance as selection criteria in breeding programmes of Segureño sheep. Logistic and Verhulst growth functions were chosen for their best fit to BW/age in this breed; the first showed the best general fit and the second the best individual fit. Live weights of 41 330 individuals from the historical archives of the National Association of Segureña Sheep Breeders were used in the analysis. The progeny of 1464 rams and 27 048 ewes were used to study the genetic and phenotypic parameters of growth curve parameters and derived traits. Reproductive management in the population consists in controlled natural mating inside every herd, with a minimum of 15% of the females fertilized by artificial insemination with fresh semen; with the purpose being the herd genetic connections, all herd genealogies are screened with DNA markers. Estimates of growth curve parameters from birth to 80 days were obtained for each individual and each function by the non-linear regression procedure using IBM SPSS statistics (version 21) with the Levenberg-Marquart estimation method. (Co)variance components and genetic parameters were estimated by using the REML/Animal model methodology. The heritability of mature weight was estimated as 0.41 ± 0.042 and 0.38 ± 0.021 with the logistic and Verhulst models, respectively, and the heritability of other parameters ranged from 0.41 to 0.62 and 0.37 to 0.61, with the models, respectively. A negative genetic correlation between mature weight and rate of maturing was found.

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Section: Resultssupporting

confidence: 87%

Section: Resultscontrasting

confidence: 83%