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Relationship between linear type and fertility traits in Nguni cows

Published online by Cambridge University Press:  14 January 2015

T. J. Zindove ,
M. Chimonyo  and
K. A. Nephawe
T. J. Zindove
Affiliation:
Department of Animal and Poultry Science, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, P. Bag X01, Scottsville 3209, Pietermaritzburg, South Africa
M. Chimonyo*
Affiliation:
Department of Animal and Poultry Science, School of Agricultural, Earth and Environmental Sciences, University of KwaZulu-Natal, P. Bag X01, Scottsville 3209, Pietermaritzburg, South Africa
K. A. Nephawe
Affiliation:
Department of Animal Sciences, Tshwane University of Technology, Private Bag X680, Pretoria 0001, South Africa
*
†E-mail: chimonyo@ukzn.ac.za
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Abstract

The objective of the study was to assess the dimensionality of seven linear traits (body condition score, body stature, body length, heart girth, navel height, body depth and flank circumference) in Nguni cows using factor analysis and indicate the relationship between the extracted latent variables and calving interval (CI) and age at first calving (AFC). The traits were measured between December 2012 and November 2013 on 1559 Nguni cows kept under thornveld, succulent karoo, grassland and bushveld vegetation types. Low partial correlations (−0.04 to 0.51), high Kaiser statistic for measure of sampling adequacy scores and significance of the Bartlett sphericity test (P<0.01) showed that there were significant phenotypic correlations between the linear traits and the data were suitable for factor analysis. Two factors had eigenvalues >1. Factor 1 included body condition score, body depth, flank circumference and heart girth and represented body capacity of cows. Factor 2 included body length, body stature and navel height and represented frame size of cows. CI and AFC decreased linearly with increase of factor 1. There was a quadratic increase in AFC as factor 2 increased (P<0.05). It was concluded that the linear type traits under study can be grouped into two distinct factors, one linked to body capacity and the other to the frame size of the cows. Small-framed cows with large body capacities have shorter CI and AFC.

Keywords

Nguni cowsbody depthcalving intervalflank circumferenceheart girth
Type
Research Article
Information
animal , Volume 9 , Issue 6 , June 2015 , pp. 944 - 951
Copyright
© The Animal Consortium 2015 

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