caa a22 4500 469127619 CHVBK 20180323133154.0 cr unu---uuuuu 170328e19921201xx s 000 0 eng 10.1007/BF02356750 doi (NATIONALLICENCE)springer-10.1007/BF02356750 Seasonal influences on gonadal and extragonadal sperm reserves in Small East African zebu ( Bos indicus ) bulls in Ethiopia [Elektronische Daten] [Azage Tegegne, K. Entwistle, E. Mukasa-Mugerwa] Summary: Body weight and scrotal circumference (SC) data were takenante mortem and genitalia collected after slaughter from Small East African zebu (SEAZ) bulls slaughtered during the wet (n=46) and the dry (n=53) seasons. Bulls slaughtered during the wet season were significantly heavier (47 kg) and had significantly larger SC measurements (3·3 cm) than those slaughtered during the dry season. Mean (±s.e.m.) paired testes weights were 233·7±13·8 and 292·8±11·3 g and epididymal weights 26·8±0·9 and 35·9±1·1 g in bulls slaughtered during the dry and wet seasons, respectively. Daily sperm production rates and epididymal sperm reserves were 2·2±0·1×109 and 3·0±0·1×109; and 16·1±0·3×109 and 17·6±0·4×109 in bulls slaughtered during the dry and wet seasons, respectively. These differences were significant. It was concluded that season affected reproductive capacity of zebu bulls probably due to variations in the quality and quantity of nutrition. However, the confounding effects of ambient temperature and nutrition on reproductive capacity of zebu bulls in tropical regions need further examinations. Centre for Tropical Veterinary Medicine, 1992 Tegegne Azage International Livestock Centre for Africa (ILCA), PO Box 5689, Addis Ababa, Ethiopia aut Entwistle K. Graduate School of Tropical Veterinary Science and Agriculture, James Cook University, Q4811, Townsville, Australia aut Mukasa-Mugerwa E. International Livestock Centre for Africa (ILCA), PO Box 5689, Addis Ababa, Ethiopia aut Tropical Animal Health and Production Kluwer Academic Publishers 24/4(1992-12-01), 216-222 0049-4747 24:4<216 1992 24 11250 https://doi.org/10.1007/BF02356750 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02356750 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tegegne Azage International Livestock Centre for Africa (ILCA), PO Box 5689, Addis Ababa, Ethiopia aut NATIONALLICENCE 700 1- Entwistle K. Graduate School of Tropical Veterinary Science and Agriculture, James Cook University, Q4811, Townsville, Australia aut NATIONALLICENCE 700 1- Mukasa-Mugerwa E. International Livestock Centre for Africa (ILCA), PO Box 5689, Addis Ababa, Ethiopia aut NATIONALLICENCE 773 0- Tropical Animal Health and Production Kluwer Academic Publishers 24/4(1992-12-01), 216-222 0049-4747 24:4<216 1992 24 11250 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer