Evaluation of non-linear models for growth curve in Brazilian tropical goats

Sousa, José Ernandes Rufino de; Façanha, Débora Andréa Evangelista; Asensio, Luis Alberto Bermejo; Ferreira, Josiel; Paiva, Renato Diógenes Macedo; Nunes, Samuel Freitas; Souza, Maria do Socorro Medeiros de

doi:10.1007/s11250-021-02598-2

Cited by 7 publications

(6 citation statements)

References 9 publications

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“…Absolute growth rate (AGR) was estimated based on the model fitted as a function of time (∂P/∂t) to describe the growth rate of the animals. This variable corresponds to the average daily body weight gain estimated along the growth curve (Sousa et al, 2021).…”

Section: Evaluation Of Lambsmentioning

confidence: 99%

“…The lamb growth curve was adjusted using the Gompertz model. This model is part of a group of non-linear models that have long been employed to describe the growth of living beings (Fernandes et al, 2012) and is one of the most used to describe the growth curve of small ruminants (Sarmento et al, 2006;Sousa et al, 2021). Lewis et al (2002) chose the Gompertz model to adjust the growth curve of Suffolk sheep, because, according to the authors, this model has desirable properties of a growth function.…”

Section: Lamb Performancementioning

confidence: 99%

“…Absolute growth rate did not show an inflection point, regardless of ewe supplementation or lamb sex, suggesting that the maximum growth rate was reached very early. In studies in which LW is monitored to adulthood, AGR decreases until the values approach zero, when asymptotic weight is reached (Silva et al, 2011;Sousa et al, 2021). Therefore, AGR allows identifying the ideal age for slaughter, since, after asymptomatic weight is reached, there is a reduction in feed conversion (Silva et al, 2011).…”

Section: Lamb Performancementioning

confidence: 99%

“…Therefore, AGR allows identifying the ideal age for slaughter, since, after asymptomatic weight is reached, there is a reduction in feed conversion (Silva et al, 2011). Studies have shown that AGR increases from birth to maximum growth, declining thereafter (Sarmento et al, 2006;Sousa 2021).…”

Section: Lamb Performancementioning

confidence: 99%

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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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Section: Evaluation Of Lambsmentioning

confidence: 99%

Section: Lamb Performancementioning

confidence: 99%

Section: Lamb Performancementioning

confidence: 99%

Section: Lamb Performancementioning

confidence: 99%

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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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“…The use of mathematical models allows producers to estimate some important information that would be difficult to obtain in practical terms, e.g., herbage intake using correlated variables (9) . Modelling also makes it possible to monitor the weight of an animal and determine the best time for its sale (10,11) . In addition, it allows producers to estimate the weight of the carcass and major cuts before slaughter (12,13) .…”

Section: Introductionmentioning

confidence: 99%

Aspectos relacionados con la importancia del uso de modelos predictivos en la producción ovina. Revisión

Gurgel

Difante

Ítavo

et al. 2022

Rev. Mex. Cienc. Pecu.

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Sheep production systems face numerous challenges, which make decision-making a process fraught with risks and uncertainties. Modelling is a helpful tool in this respect, as it allows decision-makers to evaluate the behaviour of variables and their interrelationships, in addition to using previous or related information to predict results and simulate different scenarios. The advent of prediction models has made it possible to monitor the weight of an animal and determine the best time for its sale. Additionally, it allows producers to estimate the weights of the carcass and major marketable cuts before slaughter. All this information is directly associated with the profitability and success of the production activity. Therefore, in view of the different applications of mathematical models in production systems, this literature review examines concepts in modelling studies and the importance of using prediction models in meat sheep production. Furthermore, it addresses the practical application of modelling studies in predicting dry matter intake and carcass traits of meat sheep through correlated variables.

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Estimation of body weight using body measurements in female water buffaloes reared in southeastern Mexico

Ruiz-Ramos

Torres-Chablé

Peralta-Torres

et al. 2023

Trop Anim Health Prod

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Evaluation of non-linear models for growth curve in Brazilian tropical goats

Cited by 7 publications

References 9 publications

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

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

Aspectos relacionados con la importancia del uso de modelos predictivos en la producción ovina. Revisión

Estimation of body weight using body measurements in female water buffaloes reared in southeastern Mexico

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