Growth curve for height at withers and body length of Mangalarga Marchador horses

Fernandes, Tales Jesus; Souza, Felipe Amorim Caetano de; Ribeiro, Rafaela Aparecida; Cunha, Fabiana Oliveira; Meirelles, Sarah Laguna Conceição; Moura, Regina; Muniz, Joel Augusto

doi:10.1590/0103-8478cr20200140

Cited by 5 publications

(2 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This might also apply to the Przewalski’s horse, as for example females of the closely related feral horse (e.g., in Australia: Csurhes et al 2016 ) usually do not reach their maximum adult size until an age of around 4 years. Similar results have been obtained by studies in different breeds of domestic horses, in which females are reaching adult body size and mass at an age of around 4–5 years (Fernandes et al 2020 ; Lopes Teixeira et al 2021 ). A further key mechanism leading to such an age-specific sensitivity in female Przewalski’s horses, and possibly also in other group-living ungulates, could be based on the association between the females’ age and their social rank position.…”

Section: Discussionsupporting

confidence: 87%

Age-specific effects of density and weather on body condition and birth rates in a large herbivore, the Przewalski’s horse

Rödel,

Ibler,

Ozogány

et al. 2023

Oecologia

View full text Add to dashboard Cite

Reproduction in young females can show a particularly sensitive response to environmental challenges, although empirical support from individual-based long-term studies is scarce. Based on a 20-year data set from a free-roaming Przewalski’s horse population (Equus ferus przewalskii), we studied effects of large-herbivore density (horses + cattle) and weather conditions experienced during different life stages on females’ annual birth rates. Foaling probability was very low in 2-year-olds, reaching maximum values in 5 to 10-year-olds, followed by a decrease in older females indicating reproductive senescence. Mother’s previous reproductive investment affected her current reproduction; young and old mothers (as opposed to middle-aged ones), which had nursed a foal for at least 60 days during the previous year, reproduced with a lower probability. Foaling probability and body condition of young females were lower when large-herbivore density was high. Reproduction was also influenced by interactive weather effects during different life stages. Low late-summer precipitation during the females’ year of birth was associated with a pronounced decrease in foaling probability in response to harsh late-winter temperatures prior to the mating season. In turn, increased amounts of late-summer rain during this early age together with more late-summer rain during the females’ current pregnancy led to an increased reproductive probability in 2–3-year-olds. These results were corroborated by the ameliorating effects of late-summer rain on body condition in such females. In conclusion, our findings highlight the interactive importance of weather conditions experienced during early life, and of density and weather during current pregnancy on foaling probability, particularly in young females.

show abstract

Section: Discussionsupporting

confidence: 87%

Age-specific effects of density and weather on body condition and birth rates in a large herbivore, the Przewalski’s horse

Rödel,

Ibler,

Ozogány

et al. 2023

Oecologia

View full text Add to dashboard Cite

show abstract

“…This may evidence females may reach puberty before males, even if it is at lower weights. These results agree with those reported in recent studies conducted in hybrid and native turkey breeds (Ersoy et al 2006;P erez-Lara et al 2013;Segura-Correa et al 2017), and other species (Fernandes et al 2020).…”

Section: Observed and Predicted Curve Shape Parameter Comparisonsupporting

confidence: 93%

Comparison of non-linear models to describe the growth in the Andalusian turkey breed

Arbulu

Ariza

Lupi

et al. 2021

Italian Journal of Animal Science

View full text Add to dashboard Cite

Seven non-linear growth models were compared in the Andalusian turkey, an endangered native breed. To this aim, turkeys were weekly weighted until they reached 35 weeks. The goodness-of-fit and flexibility criteria of Brody, Von Bertalanffy, Verhulst, Logistic, Gompertz, Richards, and Sinusoidal growth models were evaluated to quantify their ability to describe the biological growth curve. Goodness-of-fit criteria were assessed comparing the mean squared error (MSE) and adjusted determination coefficient (Pseudo-R 2 ), while the flexibility criteria of Akaike (AIC) and Bayesian information criteria (BIC) were evaluated to quantify the explanatory and predictive ability of the models tested. Afterward, all criteria were considered in a combined index to determine the most efficient model to describe and predict growth patterns. The best-fitting model for males growth was Logistic (MSE: 250,349.87; Pseudo-R 2 : 0.97) which also reported the best explanatory and predictive properties (AIC: 18,949.25; BIC: 18,963.24), while best goodnessof-fit criteria, explanatory and predictive capacity in females were reported for the Richards model (MSE: 144,432.45; Pseudo-R 2 : 0.95; AIC: 17,529.83; BIC: 17,549.02, respectively). Von Bertalanffy and Richards models underestimated the weight at early age stages, contrary to Logistic and Verhulst models. The asymptotic weight was higher in males than in females at all evaluated models, being 11,085.37 g for Logistic and 5,706.38 g for Richards, respectively. In conclusion, a marked sexual dimorphism is evident, with females reaching maturity earlier than males. The higher inflection point in males may enable their relatively easier commercial standardisation than in turkey hens. HIGHLIGHTSLogistic was the best fitting model for males' growth and Richards for females. Females reach maturity earlier than males with higher rates of maturity. Andalusian turkey breed shows an intense sexual dimorphism.

show abstract

On the Description of Equine Somatic Growth Using Nonlinear Functions

Kuhi

Hossein-Zadeh

France

et al. 2022

Journal of Equine Veterinary Science

View full text Add to dashboard Cite

Growth curve for height at withers and body length of Mangalarga Marchador horses

Cited by 5 publications

References 19 publications

Age-specific effects of density and weather on body condition and birth rates in a large herbivore, the Przewalski’s horse

Age-specific effects of density and weather on body condition and birth rates in a large herbivore, the Przewalski’s horse

Comparison of non-linear models to describe the growth in the Andalusian turkey breed

On the Description of Equine Somatic Growth Using Nonlinear Functions

Contact Info

Product

Resources

About