Determination of the best nonlinear function in order to estimate growth in Morkaraman and Awassi lambs

The Brody, Gompertz, Logistic and Bertalanffy functions were used to estimate growth in ewe lambs of the Morkaraman and Awassi breeds from birth to 360 days of age. For lamb growth, the Gompertz function resulted in the best fit for the Morkaraman breed, while the Bertalanffy function was best for t...

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Bibliographic Details
Published in:Small ruminant research 2004-10, Vol.55 (1), p.229-232
Main Authors: Topal, M, Ozdemir, M, Aksakal, V, Yildiz, N, Dogru, U
Format: Article
Language:English
Subjects:
animal growth
animal performance
Awassi
Awassi lambs
Bertalanffy function
breed differences
Brody function
correlation
estimation
females
Gompertz function
Growth curve
lambs
Logistic function
Morkaraman (sheep)
Morkaraman lambs
Nonlinear models
sheep breeds
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Summary:The Brody, Gompertz, Logistic and Bertalanffy functions were used to estimate growth in ewe lambs of the Morkaraman and Awassi breeds from birth to 360 days of age. For lamb growth, the Gompertz function resulted in the best fit for the Morkaraman breed, while the Bertalanffy function was best for the Awassi breed. Comparisons between these functions were based on coefficients of determination for the specific model and mean square error showed that the Brody, Gompertz, Logistic and Bertalanffy functions were more appropriate in explaining the growth performance of Awassi rather than Morkaraman lambs. The relationship between models for the parameter estimate of A, B and k in the Morkaraman and Awassi breeds were significant.
ISSN:0921-4488
1879-0941
DOI:10.1016/j.smallrumres.2004.01.007