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Comparison of Non-linear Growth Models to Describe the Growth Behaviour of Deccani Sheep

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Abstract

The present study was carried out to determine the most suitable of the six frequently used non-linear growth models, viz. Brody, Von Bertalanffy, Richards, logistic, Gompertz and negative exponential, to describe the growth curve of 146 Deccani male and female sheep maintained at ICAR—Network Project on Sheep Improvement, MPKV, Rahuri (India). The monthly body weights were collected from birth to 18 months of age for the period of January 2014 to June 2016. Sex-wise modelling of growth curve showed that females had lower maturity weights, but reached maturity earlier than males. The Brody model provided highest adjusted R2 value and the lowest value of the root means square error, Akaike’s information criterion and Bayesian information criterion as compared to other models. The Richards model showed the closeness in results of goodness of fit criteria with Brody model; however, Brody model was preferred as it was simpler (three parameters compared to four of Richards).

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Acknowledgements

The authors are thankful to the Director, ICAR—Central Sheep and Wool Research Institute, Avikanagar (Rajasthan), India, for providing funding and the necessary facility to conduct this study.

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Authors and Affiliations

  1. ICAR-Network Project on Sheep (Deccani) Improvement, Mahatma Phule Krishi Vidyapeeth, Rahuri, Maharashtra, 413722, India

    Yogesh C. Bangar, Vinu S. Lawar & Ravindra G. Nimase

  2. Department of Statistics, Mahatma Phule Krishi Vidyapeeth, Rahuri, Maharashtra, 413722, India

    Charudatta A. Nimbalkar

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  1. Yogesh C. Bangar
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  2. Vinu S. Lawar
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  3. Ravindra G. Nimase
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  4. Charudatta A. Nimbalkar
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Correspondence to Yogesh C. Bangar.

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Bangar, Y.C., Lawar, V.S., Nimase, R.G. et al. Comparison of Non-linear Growth Models to Describe the Growth Behaviour of Deccani Sheep. Agric Res 7, 490–494 (2018). https://doi.org/10.1007/s40003-018-0338-2

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  • DOI: https://doi.org/10.1007/s40003-018-0338-2

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