Modeling the growth curve of Muzaffarnagari lambs from India

Mandal, Ajoy; Baneh, Hasan; Notter, D. R.

doi:10.1016/j.livsci.2021.104621

Cited by 6 publications

(22 citation statements)

References 27 publications

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“…During the early stage of growth, the model had an error of up to 0.30 kg, the model's prediction deteriorated between 75−120 days of age (up to 0.60 kg), and its prediction finalized at 0.43 kg less than the actual final weight. Gompertz, or any other function, cannot be expected to describe all the actual growth curves since animals may not show their potential growth due to environmental effects [9,10]. For instance, in this study, the lambs diverged from the actual slaughter weight (declared slaughter weight for the Kivircik lamb is 30−50 kg in the field by Turkpatent [20]) at 150 days of age by showing only a 66.3% maturity degree.…”

Section: Discussionmentioning

confidence: 77%

“…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: 77%

Section: Introductionmentioning

confidence: 99%

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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“…Where available, the liveweight of the animals was filtered from the clinical records and transferred to an Excel spreadsheet. 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 14–16 . The breed and sex of the patient were taken from the clinical records.…”

Section: Methodsmentioning

confidence: 99%

“…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%

“…After data cleaning and final preparation, a total of 5113 antibiotic doses administered remained in the dataset (Figure 1). As a large number of actual liveweights were missing from this dataset (2881/5113; 56.3%), the standardised liveweight for each sheep or goat breed was calculated for all animals in this study using the Brody growth curve [14][15][16] and used to calculate the total mg/kg of antibiotic administered.…”

Section: Antibiotic Doses Administeredmentioning

confidence: 99%

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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

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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.

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Determination of the effect of the dam age, birth type, and sex on growth curve traits of hair goat kids

Güler,

Çam,

Atik

2023

Trop Anim Health Prod

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Modeling the growth curve of Muzaffarnagari lambs from India

Cited by 6 publications

References 27 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

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

Determination of the effect of the dam age, birth type, and sex on growth curve traits of hair goat kids

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