Relations between leptin and testosterone and glucose concentrations, fattening performance and reproductive development in growing bulls
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Date
2008
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Publisher
Uludağ Üniversitesi
Abstract
This study were performed in 7 Brown Swiss and 7 Holstein bulls. The leptin concentrations at 12 months of age and testosteron concentrations at 9 months of age were statistically different between Brown Swiss and Holstein bulls (P < 0.05). In hip heights, a statistical difference at the level of P < 0.01 and P < 0.05 was observed at the 7, 11 and 12 months of age values and at the 8, 9 and 10 months of age values, respectively, between the two breeds of bulls. Furthermore, live weight gains and feed conversion values at 8 months of age were also significantly different (P < 0.05 and P < 0.01, respectively). Statistically negative correlations (P < 0.05) were observed between leptin concentrations and hip heights and scrotal circumferences of Brown Swiss bulls. The correlation was observed only between the leptin and testosteron concentrations in Holstein bulls (P < 0.05). In conclusion, the data obtained from Holstein bulls implies that leptin might be involved in growth and reproductive development, no association, however, was obtained between leptin and feeding performance.
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Keywords
Leptin, Fattening performance, Reproductive development, Bull
Citation
Doğrutekin, D. vd. (2008). "Relations between leptin and testosterone and glucose concentrations, fattening performance and reproductive development in growing bulls ". Journal of Biological and Environmental Sciences, 2(4), 23-27.