Biometric analysis of testicular development in Africander cattle.
A total of 208 Africander bulls was examined clinically and genetically. Of these, 113 were selected to elaborate a table on the testicular development in this race. The selection criteria were, absolute certainty in age, intervals with greater number of observations and with lesser coefficient of variation. The regressions and simple correlations for the following characteristics were studied: Age-Scrotal Circumference (A/SC), Age-Left Length (A/LL), Age-Right Length (A/RL), Age-Ratio of Age to Scrotal Circumference (A/RASC), Scrotal Circumference-Left Length (SC/LL) and Scrotal Circumference-Right Length (SC/RL). All these regressions are linear. The regression coefficient were also compared, using the "t-test" for the following: A/RL-A/LL, A/SC-A/LL, A/SC-A/LL, A/SC-A/RL, A/RASC-A/RAL and SC/RL-SC/LL. The difference is not significant for A/RL-A/LL and SC/RL-SC/LL (P>0.05), but it is significant for A/SC-A/LL, A/SC-A/RL and A/RASC-A/RAL (P<0.01).
Díaz
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Ministry of Agriculture Maputo, Mozambique; Institute of Reproduction and Animal Improvement P.O. Box 25, Matola, Mozambique.
Mandlhate
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