Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Life Sciences
Studies On The Age, Growth And Reproduction Characteristics Of The Chub, Leuciscus Cephalus Orientalis, (Nordmann, 1840) In Karasu River, Turkey, Orhan Erdoğan, Mustafa Türkmen, Ayhan Yildirim
Studies On The Age, Growth And Reproduction Characteristics Of The Chub, Leuciscus Cephalus Orientalis, (Nordmann, 1840) In Karasu River, Turkey, Orhan Erdoğan, Mustafa Türkmen, Ayhan Yildirim
Turkish Journal of Veterinary & Animal Sciences
This study is based on the examination of 759 chubs from Karasu River (40° 45´ 33´´ E, 39° 56´ 16´´ N) between November 1995 and October 1997. This population comprised seven age groups of males and nine of females. The second age group was dominant in the population. Individuals were composed of 50.46% males and 49.54% females. The male and female ratio was 1:1.019 (M:F). The Von Bertalanffy growth parameters and length-weight relationships were; L_t = 35.8765 (1-e^{-0.1241(t+1.16660)}), W_t = 583.2981 (1-e^{-0.1241(t+1.16660)})^{2.952}, W = 0.0150 FL^{2.952} in males and L_t = 41.4154 (1-e^{-0.1160(t+1.3207)}), W_t = 936.3338 (1-e^{-0.1160(t+1.3207)})^{2.980}, W = 0.0142 …
Annual Cycle Of Serum Gonadal Steroids And Serum Lipids In Capoeta Capoeta Umbla, Güldenstaedt, 1772 (Pisces: Cyprinidae), Orhan Erdoğan, Hali̇l İbrahi̇m Hali̇loğlu, Abdulkadi̇r Çi̇ltaş
Annual Cycle Of Serum Gonadal Steroids And Serum Lipids In Capoeta Capoeta Umbla, Güldenstaedt, 1772 (Pisces: Cyprinidae), Orhan Erdoğan, Hali̇l İbrahi̇m Hali̇loğlu, Abdulkadi̇r Çi̇ltaş
Turkish Journal of Veterinary & Animal Sciences
Seasonal changes in serum concentrations of the testosterone in males, 17\beta-estradiol in females and triglyceride and cholesterol in both sexes of Capoeta capoeta umbla were determined. Peak concentrations of testosterone (2.828 ± 0.278 ng/mL) and 17\beta-estradiol (3.182 ± 0.116 ng/mL) occurred in May. The concentrations of testosterone and 17b-estradiol were significantly correlated with the gonadosomatic index in both sexes. After the spawning period, steroid hormone levels significantly diminished (P < 0.05). The triglyceride concentration was highest in April (607.611 ± 30.146 mg/dL). The serum cholesterol level showed a rising trend until April and reached peak values during this month (393.000 ± 8.991 mg/dL). In the spawning month (May), a significant decrease was observed in triglyceride and cholesterol concentrations (P < 0.05). These results suggest that seasonal changes in both serum lipids and steroid hormones were associated with reproductive activity in C. c. umbla.
Maximising The Lamb Drop, Don Moir
Maximising The Lamb Drop, Don Moir
Bulletins 4000 -
Although reproductive rates vary greatly between individual properties, the average marking percentage in Western Australia still hovers around 75%. In the absence of disease it is possible to improve on this figure by undertaking some straight forward management practices at different stages of the reproductive cycle.