International Journal of Agricultural Policy and Research
Vol.5 (11), pp. 163-168, November 2017
Available online at https://www.journalissues.org/IJAPR/
Article 17/ID/JPR050/06 pages
Author(s) retain the copyright of this article. Author(s) agree that this article remain permanently open access under the terms of the Creative Commons Attribution License 4.0 International License.
Original Research Article
Seasonal changes in clinical parameters of Bos indicus, Bos taurus and Bos indicus x taurus bulls raised on Zambian commercial farms
M.C., Sitali1*, A.M., Mwanza2, E.S., Mwaanga1, I.R., Parsons3 and N.J., Parsons3
1Department of Biomedical Sciences The University of Zambia, P.O. Box, 32379, Lusaka, Zambia.
2Department of Clinical Studies, Faculty of Veterinary Medicine, The University of Zambia, P.O. Box, 32379, Lusaka, Zambia.
3Matobo Veterinary Centre, P.O. Box, 670387, Mazabuka, Zambia.
*Corresponding Author Email: sitalimuloongo(at)yahoo.com
The primary objective of the study was to assess the relationships of age, Scrotal circumference (SC), month and Body condition score (BCS) of Bos indicus, Bos taurus and Bos indicus x taurus bulls raised on Zambian commercial farms. This was a retrospective study involving 1007 bull breeding soundness data from January 2014 to November 2015. The bull population comprised of 314 Bos indicus, 139 Bos indicus x taurus and 554 Bos taurus bulls. There was a positive correlation between age and SC (r = 0.704, p<0.01). Breed had a weak positive correlation with SC and BCS (r = 0.230 and r= 0.113, respectively, p<0.01). The Bos taurus bulls had the largest SC compared to the Bos indicus and their crosses. There was a weak positive correlation between BCS and SC (p = 0.328, p<0.01), and negative correlations between month and SC, month and BCS (p =-0.214, and p =-0.448, respectively, p<0.01). About 50% of the variation in SC was explained by the change in age of the bull. In conclusion, it is important to consider the relationships of age, BCS, SC of different Zambian commercial breeds of bulls when selecting bulls for breeding programmes throughout the year.
Key words: Age, breed, body condition score, scrotal circumference.