Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Afrique du Sud → 2012 → The effects of weather variability on growth potential of Afrikaner cattle in a semi-arid region in Zimbabwe

UNIVERSITY OF SOUTH AFRICA (2012)

The effects of weather variability on growth potential of Afrikaner cattle in a semi-arid region in Zimbabwe

Chipfupa, Lukas

Titre : The effects of weather variability on growth potential of Afrikaner cattle in a semi-arid region in Zimbabwe

Auteur : Chipfupa, Lukas

Université de soutenance : UNIVERSITY OF SOUTH AFRICA

Grade : MASTER OF SCIENCE 2012

Résumé
The abiotic environment plays an important role in cattle production. Key abiotic elements evaluated in this study are rainfall and temperature. This study was carried out to assess the effect and contribution of rainfall and temperature, amid other factors, on pre- and post-weaning growth traits of Afrikaner cattle at Matopos Research Institute from 1958 to 1997. Historical data generated from a genotype x environment interaction study at Matopos Research Institute was used to identify factors associated with the average daily weight gain of calves of Afrikaner cattle breed. A total of 10 700 records were retrieved comprising of birth weight (BW), 90 day weight, 205 day weight and early post-weaning weight as well as additional corresponding rainfall and temperature data from 1958 to 1997. The rainfall and temperature data was computed asrainfall and temperature variability. The data was corrected for heteroscedasticity using the generalized least squares approach (GLS) before running an ordinary least square regression (OLS) analysis to determine the association between growth rate and potential explanatory factors for average daily weight gain, pre-weaning weight gain and early post-weaning weight gain.

Présentation

Version intégrale (1,98 Mb)

Page publiée le 3 novembre 2013, mise à jour le 25 mai 2018