Application of Regression Tree Methodology in Predicting the Body Weight of Uda Sheep

Abdulmojeed Yakubu

Abstract


This study aimed at evaluating the relationship between body weight and nine morphometric traits (withers height,rump height, body length, face length, rump length, chest circumference, head width, shoulder width and rumpwidth) of Uda sheep using regression tree technique. The data for the study were generated from 499 Uda ramsrandomly selected from different herds in Nasarawa State, north-central Nigeria. Pearson’s moment correlation (r)between body weight and morphometric traits ranged from moderate to high values (r = 0.43-0.76; P≤0.01). Basedon the importance of the independent variables in predicting the body weight of sheep, five body measurementsnamely; chest circumference, shoulder width, rump width, body length and face length were found to be moreefficient. Thus, they were the variables entered to obtain the optimal regression tree. Among these five variables,chest circumference was found to be the primary splitting variable; and together with face length accounted for about62% of the variation in body weight. The regression tree analysis indicated that animals with chest circumference >87.45cm or ≤ 94.05cm and face length > 28.85cm could be expected to have higher body weights. This informationcould be exploited by livestock producers for management, selection and genetic improvement of Uda sheep.

Keywords


body measurement; body weight; correlation; tree regression; Uda sheep

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Scientific Papers Animal Science and Biotechnologies publish open access articles under the terms of the Creative Commons Attribution 4.0 Licence (read full legal code).


LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

ISSN print 1841 - 9364
ISSN online 2344 - 4576
ISSN-L  1841 - 9364
(former ISSN 1221-5287, E-ISSN 1841-9364)

PUBLISHER: AGROPRINT Timisoara, Romania
PAPER ACCESS: Full text articles available for free
FREQUENCY: Semiannual
PUBLICATION LANGUAGE: English
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Banat´s University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania" from Timisoara
Faculty of Animal Science and Biotechnologies
300645, Timişoara, Calea Aradului 119, Romania

E-mail: spasb [at] animalsci-tm.ro
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