Characterisation of biological growth curves of different varieties of an endangered native hen breed kept under free range conditions

Ariza, Antonio González; Nogales, Sérgio; Lupi, T. M.; Arbulu, Ander Arando; González, Francisco Javier Navas; Jurado, José Manuel León; Bermejo, Juan Vicente Delgado; Vallejo, M. E. Camacho

doi:10.1080/1828051x.2021.1915190

Cited by 9 publications

(7 citation statements)

References 25 publications

(23 reference statements)

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“…The growth parameters were analyzed by using the Marquardt method NLIN procedure of SAS. The fit of the growth models (which is suitable for the non-linear regression model) was assessed by evaluating the mean squared error (MSE), the pseudo-coefficient of determination (Pseudo-R 2 ) and Akaike information criterion (AIC) [24,25]. After that, parameters α, β, and γ were used to estimate the age at inflection point (IPA), the weight at inflection point (IPW), and the maximum growth rate (MGR) [26].…”

Section: Data and Statistical Analysismentioning

confidence: 99%

Genetic Effect and Growth Curve Parameter Estimation under Heat Stress in Slow-Growing Thai Native Chickens

Boonkum

Duangjinda

Kananit

et al. 2021

Veterinary Sciences

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Heat stress is becoming a major problem because it limits growth in poultry production, especially in tropical areas. The development of genetic lines of Thai native chickens (TNC) which can tolerate the tropical climate with the least compromise on growth performance is therefore necessary. This research aims to analyze the appropriate growth curve function and to estimate the effect of heat stress on the genetic absolute growth rate (AGR) in TNC and Thai synthetic chickens (TSC). The data comprised 35,355 records for body weight from hatching to slaughtering weight of 7241 TNC and 10,220 records of 2022 TSC. The best-fitting growth curve was investigated from three nonlinear regression models (von Bertalanffy, Gompertz, and logistic) and used to analyze the individual AGR. In addition, a repeatability test-day model on the temperature-humidity index (THI) function was used to estimate the genetic parameters for heat stress. The Gompertz function produced the lowest mean squared error (MSE) and Akaike information criterion (AIC) and highest the pseudo-coefficient of determination (Pseudo-R2) in both chicken breeds. The growth rates in TSC were higher than TNC; the growth rates of males were greater than females, but the age at inflection point in females was lower than in males in both chicken breeds. The THI threshold started at 76. The heritability of the AGR was 0.23 and 0.18 in TNC and TSC, respectively. The additive variance and permanent environmental variance of the heat stress effect increased sharply after the THI of 76. The growth rate decreased more severely in TSC than TNC. In conclusion, the Gompertz function can be applied with the THI to evaluate genetic performance for heat tolerance and increase growth performance in slow-growing chicken.

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Section: Data and Statistical Analysismentioning

confidence: 99%

Genetic Effect and Growth Curve Parameter Estimation under Heat Stress in Slow-Growing Thai Native Chickens

Boonkum

Duangjinda

Kananit

et al. 2021

Veterinary Sciences

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“…Moreover, several parameters referring to the inflection point ( ip ), or the time at which the growth rate reached its maximum, were calculated. In particular, the BW at ip (g) was obtained as BW ip = A / e , the age at ip (day) as t ip = (ln( b ))/ k , and the maximum growth rate ( MGR ) or rate at ip (g/d) as BW ip × k ( González Ariza et al, 2021b ).…”

Section: Methodsmentioning

confidence: 99%

Crossbreeding to improve local chicken breeds: predicting growth performance of the crosses using the Gompertz model and estimated heterosis

et al. 2023

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“…In a third study, González Ariza et al [ 78 ] analysed the growth curves of each of the four plumage varieties of the Utrerana breed up to one year of age, reared under free-range conditions. For both sexes, the Logistic model was better adjusted to the growth of the White variety, while for the other three varieties the adjustment was better with the Von Bertalanffy model.…”

Section: Growth Curvesmentioning

confidence: 99%

“…The main conclusions of research on the growth curves of the Utrerana chicken are that, in accordance with its live weight and growth pattern, it can be considered a light [ 76 , 77 , 78 ], slow-growing breed [ 78 ], with an unimproved genotype oriented more to egg production, with clear sexual dimorphism [ 77 ] and that shows inter-varieties weight differences [ 78 ].…”

Section: Growth Curvesmentioning

confidence: 99%

Origin, Selection and Current Status of the Utrerana Chicken Breed: A Review

Plata-Casado,

García-Romero,

González-Redondo

2023

Animals

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The conservation of threatened local livestock genetic resources involves characterising them to implement conservation strategies. The Utrerana is a Mediterranean-type chicken breed, included in the Official Catalogue of Livestock Breeds of Spain and in the Domestic Animal Diversity Information System (DAD-IS) of the Food and Agriculture Organization (FAO), native to south Spain created in 1926 by a farmer from Utrera (Seville province). It was selected for laying performance and with four plumage varieties (White, Black, Black-barred and Partridge), reaching average yields of 180 eggs per hen per year. It was widely used in commercial farming in the second quarter of the 20th century, being subsequently displaced in the second half of the 20th century by the spreading of the improved foreign breeds and lines. The Utrerana breed was reared from then on for its aesthetic values and in backyard systems, being endangered with a vulnerable local risk status (1822 birds in 2022 with an increasing trend) and having worsened its laying performance as selection for productivity ceased. The breed has received little attention from the research community. Therefore, this work aims to review the literature on the origin, selection, genetic and productive characterisation and status of the populations of the breed, as well as the conservation strategies. The Utrerana chicken is a polymorphic breed showing high genetic diversity, sexual dimorphism and morpho-functional differences among varieties. Currently, Utrerana hens start laying at 6 months of age, and a hen lays 94–121 high quality eggs (59–64 g) per year, showing seasonality. It is a slow-growing breed with mature weights of 2.4–2.6 kg for roosters and 1.9–2.0 g for hens. The Utrerana chicken breed is rustic and adapted to alternative farming systems. This review has identified research gaps to be filled, such as characterising the carcass and meat quality of the Utrerana chicken, and evidences the need to make efforts to promote the breed and expand its populations.

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Characterisation of biological growth curves of different varieties of an endangered native hen breed kept under free range conditions

Abstract: Vallejo (2021) Characterisation of biological growth curves of different varieties of an endangered native hen breed kept under free range conditions,

Cited by 9 publications

References 25 publications

Genetic Effect and Growth Curve Parameter Estimation under Heat Stress in Slow-Growing Thai Native Chickens

Genetic Effect and Growth Curve Parameter Estimation under Heat Stress in Slow-Growing Thai Native Chickens

Crossbreeding to improve local chicken breeds: predicting growth performance of the crosses using the Gompertz model and estimated heterosis

Origin, Selection and Current Status of the Utrerana Chicken Breed: A Review

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