Characterization of the commercial growth curves of Spanish Merino, Fleischschaf, and crossbred lambs in an associative economy context

Lopez, Bryan Irvine; Lupi, T. M.; León, José M.; López, F.; Agudo, B.; Delgado, J. V.

doi:10.1016/j.smallrumres.2018.04.009

Cited by 10 publications

(6 citation statements)

References 18 publications

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“…These parameters can be evaluated before applying a robust selection to improve the slaughter characteristics of animals since body weight and the rate of weight gain are the most economically important parameters for sheep fattening [12]. In our study, all the models predicted higher A values for male lambs compared to female lambs, which could be explained by sexual dimorphism resulting in heavier adult weights for male lambs [7,11,48]. In the current study, all the models predicted higher A values for twin-born lambs.…”

Section: Discussionmentioning

confidence: 74%

“…Furthermore, the Brody model did not converge for the birth-type subscale, which caused its application to be inaccurate. In particular, during the early phase of growth, the Brody model was reported to be inappropriate [7,10,11,43].…”

Section: Discussionmentioning

confidence: 99%

“…Simple linear models, models with both exponential and negative exponential growth, and models with a sigmoidal shape (S-shape) are generally applied to fit the age-weight data into growth curves for lambs [8]. However, the best fitting model that appropriately describes lamb growth remains controversial due to different sample sizes, breeds of sheep, management practices, production types, and climates among the studies [9][10][11][12][13][14][15]. Additionally, Van der Merwe et al [3] identified that the type of data would determine the best fitting growth model.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Nonlinear Growth Models to Estimate Growth Curves in Kivircik Sheep under a Semi-Intensive Production System

Öztürk

Keçici

Serva

et al. 2023

Animals

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The Kivircik is an indigenous sheep breed from Turkey, and it has superior meat quality compared to other indigenous breeds. Therefore, farmers prioritize Kivircik lamb fattening instead of milk production. Here, we aimed to determine the best nonlinear growth model, i.e., Gompertz, Logistic, Von Bertalanffy, and Brody, to describe the growth curve of Kivircik lambs. The body weight data from birth until 150 days of age belonging to 612 lambs were used as the material of this study. The best fitting model was selected by considering the adjusted coefficient of determination (R2adj), residual mean square, and Akaike’s (AIC) and Bayesian information criteria (BIC). Even though the Brody model had a better statistical fit, considering its biological interpretation, the Gompertz model was identified as an appropriate model for describing Kivircik lamb growth. Male lambs, twin lambs, and lambs born in winter had higher mature live weights (44.2 kg, 71.2 kg, and 38.5 kg, respectively) and rate of weight gain (2.1, 2.6, and 2.0, respectively). However, our subgroups revealed a similar rate of maturity (0.01). Growth models are important tools for deciding the optimal slaughter age and they provide valuable information on the management practices of both sexes, birth types, and birth seasons. These results can be applied to breeding programs for early selection, enabling intervention strategies when needed.

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Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of Nonlinear Growth Models to Estimate Growth Curves in Kivircik Sheep under a Semi-Intensive Production System

Öztürk

Keçici

Serva

et al. 2023

Animals

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show abstract

“…En la tabla 1, se presentan los estimadores de los parámetros β0, β1, β2, y los criterios para la selección del modelo que mejor se ajustó a los datos. De acuerdo con los resultados, se puede observar que, en los modelos de Gompertz, Bertalaffy y Logístico, las diferencias entre los criterios de selección son muy pequeñas, lo que supondría que cualquiera de ellas ajustaría, satisfactoriamente, para describir el crecimiento de la población ovina estudiada; sin embargo, teniendo en cuenta los valores AIC y BIC estimados para el modelo de Brody, se infiere que es el modelo que mejor se ajusta, además el valor de A diferencia de este estudio, se reportó que el modelo de Brody no convergió bien, al describir el crecimiento en ovinos de diferentes grupos genéticos y sexo (López et al 2018). En este mismo sentido, en corderos Norduz fueron evaluados los modelos de De acuerdo con lo expresado, se puede evidenciar que es específico de cada población tener un modelo particular para describir en forma más apropiada su crecimiento, lo cual, está directamente relacionado con el tipo racial, sistema de alimentación, condiciones ambientales, en las que se desarrollan los individuos.…”

Section: Resultados Y Discusiónunclassified

Curvas de crecimiento en ovino de pelo colombiano en los departamentos de Córdoba y Cesar, Colombia

Noriega-Márquez

Hernández-Herrera

Bustamante-Yánez³

et al. 2022

Rev. U.D.C.A Act. & Div. Cient.

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“…Lambs of both sexes followed a similar growth pattern until 50 days of age, which diverged around 90 days. This indicates sexual dimorphism, in which faster growth is inversely related to sexual maturity, since late-puberty animals-such as the mixed-breed ewes used in this experiment-maintain longer periods of growth and weight gain (López et al, 2018;Pinheiro et 2020). Similar results (differences between the growth curves of different sexes) were also observed by Gurgel et al (2021), who adjusted growth curves for Santa Inês sheep in the pre-weaning phase using a first-degree linear equation, and by Kopuzlu et al (2014), who used a Brody model to adjust the growth curves of male and female sheep of wooled breeds.…”

Section: Lamb Performancementioning

confidence: 95%

Effect of supplementation of ewes in the final third of gestation on the development of their lambs

Campos¹,

Difante²,

Gurgel³

et al. 2022

Revista Brasileira De Zootecnia

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This study examined the effect of different supplementation strategies for ewes in the last third of gestation, kept on a deferred Brachiaria brizantha cv. Marandu pasture, on their performance and the growth curve of their lambs. A total of 54 ewes, of no defined breed, with an average weight of 41.10±3.10 kg, were used in a completely randomized design, divided into three groups (18 ewes per treatment). In total, 61 lambs were born, 28 females and 33 males, with 3.70±0.55 and 3.68±0.69 kg birth weight, respectively. Treatments were as follows: multiple mixture ad libitum, concentrate supplement at 0.4% live weight (LW), and concentrate supplement at 0.8% LW. Average daily weight gain (ADG, g/animal/day) and total weight gain (TWG, kg/animal) were evaluated in ewes and lambs. Reproductive efficiency indices were measured in the ewes and biometric variables in the lambs. The ADG and TWG of ewes in the last third of gestation were higher in animals supplemented at 0.8% LW. Reproductive efficiency results were superior in ewes supplemented at 0.4% LW. The effect of ewe supplementation on lamb growth curve as estimated by the Gompertz model did not reveal differences between the curves of lambs born to ewes that received supplementation at 0.4 and 0.8% LW. However, supplementing ewes with a multiple mixture induced a reduction in the growth curve parameters of their lambs. The use of concentrated supplementation, at levels of 0.4 and 0.8% of LW, provides greater productive and reproductive performance for ewes and lambs.

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Characterization of the commercial growth curves of Spanish Merino, Fleischschaf, and crossbred lambs in an associative economy context

Cited by 10 publications

References 18 publications

Comparison of Nonlinear Growth Models to Estimate Growth Curves in Kivircik Sheep under a Semi-Intensive Production System

Comparison of Nonlinear Growth Models to Estimate Growth Curves in Kivircik Sheep under a Semi-Intensive Production System

Curvas de crecimiento en ovino de pelo colombiano en los departamentos de Córdoba y Cesar, Colombia

Effect of supplementation of ewes in the final third of gestation on the development of their lambs

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