The growth of domestic goats and sheep: A meta study with Bertalanffy-Pütter models

Brunner, Norbert; Kühleitner, Manfred

doi:10.1016/j.vas.2020.100135

Cited by 15 publications

(13 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We nevertheless used the five-parameter BP-model for our research, as initially we were interested in another question: We observed that for about half of the birds the best-fit exponent-pair was close to the diagonal ( Fig 3 ). We had similar observations also for other species [ 29 ]. Was there a biological reason for this?…”

Section: Discussionsupporting

confidence: 87%

“…m(0) = c > 0. This model was recently recommended in epidemiology [22][23][24] and it was also proposed [25] and applied [26][27][28][29] for studies in animal growth, where the BP-model (1) achieved significant improvements over the logistic model and other simpler three-parameter models with respect to the fit of the data. However, the benefits of its use remained little known and insufficiently evaluated.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bertalanffy-Pütter models for avian growth

2021

Self Cite

View full text Add to dashboard Cite

This paper explores the ratio of the mass in the inflection point over asymptotic mass for 81 nestlings of blue tits and great tits from an urban parkland in Warsaw, Poland (growth data from literature). We computed the ratios using the Bertalanffy-Pütter model, because this model was more flexible with respect to the ratios than the traditional models. For them, there were a-priori restrictions on the possible range of the ratios. (Further, as the Bertalanffy-Pütter model generalizes the traditional models, its fit to the data was necessarily better.) For six birds there was no inflection point (we set the ratio to 0), for 19 birds the ratio was between 0 and 0.368 (lowest ratio attainable for the Richards model), for 48 birds it was above 0.5 (fixed ratio of logistic growth), and for the remaining eight birds it was in between; the maximal observed ratio was 0.835. With these ratios we were able to detect small variations in avian growth due to slight differences in the environment: Our results indicate that blue tits grew more slowly (had a lower ratio) in the presence of light pollution and modified impervious substrate, a finding that would not have been possible had we used traditional growth curve analysis.

show abstract

Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Bertalanffy-Pütter models for avian growth

2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…For literature data about sheep and goats there was a similar observation about the difficulty to identify sigmoidal growth data (Brunner and Kuhleitner 2020). There the Brody model was outstanding.…”

Section: Discussionmentioning

confidence: 80%

“…The general BP model has been successfully used to describe the growth of chickens (Kuhleitner et al 2019), dinosaurs (Brunner et al 2019), fish (Renner-Martin et al 2018), or goats and sheep (Brunner and Kuhleitner 2020). Here we asked if the BP model could provide additional insight into the growth of cattle, whereby we aimed at recommendations about growth modelling for practitioners: we compared linear and nonlinear models and asked which type of model might be most suitable for modelling the biological growth of cattle.…”

mentioning

confidence: 99%

Modelling the growth of rearing cattle

Unterauer¹,

Brunner²,

Kühleitner³

2021

CZECH J ANIM SCI

Self Cite

View full text Add to dashboard Cite

Scientific growth literature often uses the models of Brody, Gompertz, Verhulst, and von Bertalanffy. The versatile five-parameter Bertalanffy-Pütter (BP) model generalizes them. Using the least-squares method, we fitted the BP model to mass-at-age data of 161 calves, cows, bulls, and oxen of cattle breeds that are common in Austria and Southern Germany. We used three measures to assess the goodness of fit: R-squared, normalized root-mean squared error, and the Akaike information criterion together with a correction for sample size. Although the BP model improved the fit of the linear growth model considerably in terms of R-squared, the better fit did not, in general, justify the use of its additional parameters, because most of the data had a non-sigmoidal character. In terms of the Akaike criterion, we could identify only a small core of data (15%) where sigmoidal models were indispensable.

show abstract

“…Given the large differences between breed sizes in sheep and goats (ranging from an adult pygmy goat weighing 25-30 kg to adult Tyrolean mountain sheep weighing 100-130 kg), liveweight for all animals was also estimated using the Brody growth curve dependent on sheep or goat breed standards. [14][15][16] The breed and sex of the patient were taken from the clinical records. The breed-specific liveweight of adult animals was taken, where possible, from the book 'The colour atlas of domestic livestock breeds (Farbatlas Nutztierrassen)'.…”

Section: Liveweight Calculationsmentioning

confidence: 99%

Comparison of metrics to assess antibiotic use in small ruminants at a university referral clinic between 2005 and 2019

Firth,

Keppelmüller,

Käsbohrer

et al. 2023

Veterinary Record

View full text Add to dashboard Cite

BackgroundMonitoring antibiotic use is essential to provide a framework enabling veterinarians to use antibiotics prudently.MethodsElectronic medical records from the University of Veterinary Medicine's Clinic for Ruminants in Vienna were analysed with respect to sheep and goat antibiotic doses administered over a 15‐year period (2005–2019). Antibiotic use was assessed using total milligrams per kilogram (mg/kg), total milligrams, number of doses administered, defined daily doses (DDD) for cattle and estimated DDD for sheep.ResultsA total of 5113 antibiotic doses were recorded over the 15‐year period. Urinary tract disorders required the highest number of doses administered per animal (mean 16.9; median 16.0). Antibiotic use patterns varied according to the metrics used for analysis. By mg/kg, the largest proportion of antibiotics administered were penicillin/streptomycin (43.0% of the total mg/kg), followed by tetracyclines (17.3%) and sulphonamide/trimethoprim combinations (15.2%). By number of doses administered, the most frequently used antibiotics were penicillins (excluding combinations with streptomycin) (33.9% of total number of doses administered), fluoroquinolones (25.1%), third/fourth‐generation cephalosporins (13.6%) and penicillin/streptomycin (13.4%).LimitationsAs the university clinic was a city‐based referral centre, this analysis cannot be compared directly with antibiotic use in commercial herds or flocks.ConclusionsThe considered choice of antibiotic use metrics is essential for an effective and meaningful analysis of the responsible use of antibiotics by veterinarians in practice.

show abstract

The growth of domestic goats and sheep: A meta study with Bertalanffy-Pütter models

Cited by 15 publications

References 62 publications

Bertalanffy-Pütter models for avian growth

Bertalanffy-Pütter models for avian growth

Modelling the growth of rearing cattle

Comparison of metrics to assess antibiotic use in small ruminants at a university referral clinic between 2005 and 2019

Contact Info

Product

Resources

About