Comparison of tree-based regression tree methods for predicting live body weight from morphological traits in Hy-line si
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Comparison of tree-based regression tree methods for predicting live body weight from morphological traits in Hy-line silver brown commercial layer and indigenous Potchefstroom Koekoek breeds raised in South Africa Thobela Louis Tyasi 1
&
Ecevit Eyduran 2 & Senol Celik 3
Received: 16 May 2020 / Accepted: 15 October 2020 # Springer Nature B.V. 2020
Abstract In animal breeding, more considerable attention is drawn to reveal the relationship between live body weight and morphological traits in identifying breed and species standards. The aim of this study was to predict live body weight from morphological characteristics in the Hy-line silver brown commercial layer and indigenous Potchefstroom Koekoek breed, native to South African. In the prediction of live body weight, eleven morphological measurements, i.e., wing length, back length, beak length, shank length, shank circumference, chest circumference, wingspan, keel length, body girth, toe length, and body length, were taken. As tree-based regression tree methods, predictive performances of CART, CHAID, and exhaustive CHAID algorithms were measured for body weight prediction. Among those, CART was found to be the best decision tree algorithm that gave the highest predictive accuracy. CART visual results reflected that the heaviest body weight mean (2.000 kg) was obtained from the chickens with 10.250 cm < WL ≤ 10.500 cm. As a result, it could be suggested that the CART decision tree might help to determine breed standards of the Hy-line silver brown commercial layer and, especially, indigenous Potchefstroom Koekoek breeds for breeding programs. Keywords Potchefstroom Koekoek breed . Decision tree . Morphological trait
Introduction In poultry science, a great attention is received to reveal the relationship between live body weight and morphological traits in characterizing breed and species standards, and especially conserving indigenous gene resources. A prime opinion is that poultry breeders establish morphological traits explaining the variability of body weight for breeding goals. * Thobela Louis Tyasi [email protected] 1
School of Agricultural and Environmental Sciences, Department of Agricultural Economics and Animal Production, University of Limpopo, Private Bag X1106, Sovenga, Limpopo 0727, South Africa
2
Department of Business Administration, Quantitative Methods, Faculty of Economics and Administrative Sciences, Iğdır University, Iğdır, Turkey
3
Department of Animal Science, Biometry Genetics Unit, Agricultural Faculty, Bingol University, Bingol, Turkey
With the aim of making a straight decision on deciding the influence morphological traits affecting the body weight as part of the indirect selection in indigenous chicken breeds, one may select to use robust statistical procedures for the body traits measured properly. Among farm animals, indigenous and exotic chickens are a significant meat source for meeting the daily essential requirements of healthy humans and obtaining healthy generations. However, indigen
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