dc.contributor.author | Mukasa-Mugerwaa, E | |
dc.contributor.author | Mutigaa, ER | |
dc.date.accessioned | 2013-06-13T14:26:59Z | |
dc.date.available | 2013-06-13T14:26:59Z | |
dc.date.issued | 1993 | |
dc.identifier.citation | Mukasa-Mugerwa, E. and Mutiga, E. R. 1993. Peripubertal plasma progesterone patterns in Ethiopian Menz ewe lambs. J. Appl. Anim. Res., 3: 31–38 | en |
dc.identifier.uri | http://www.tandfonline.com/doi/abs/10.1080/09712119.1993.9705950#.UbnVU2eoNkh | |
dc.identifier.uri | http://erepository.uonbi.ac.ke:8080/xmlui/handle/123456789/33283 | |
dc.description.abstract | Plasma progesterone concentrations were determined every 10 days for 38 grazing Menz ewe lambs from weaning (93 ± 7 d) until conception. Lambs were either fedextra supplementary concentrates and/or drenched for endoparasites. Inadequate nutrition delayed puberty onset by 4 to 5 months (P≤0.05). Progesterone concentrations, determined by the ELISA technique, were basal (≤1.0 ng/ml) before puberty. Subsequently, 63% lambs exhibited a ‘silent ovulation’ prior to first behavioural oestrus but, transient rises of progesterone were not observed in 45% of lambs conceiving at first mating. Further, first oestrus was unovulatory (non-pubertal) in 21.1% of animals which may bias estimates of puberty onset based only on first oestrous behaviour. 5% of lambs exhibited a gestational oestrus. | en |
dc.language.iso | en | en |
dc.publisher | University of Nairobi | en |
dc.subject | lambs,puberty,progesterone,non-pubertal oestrus,tropics | en |
dc.title | Peripubrtal Plasma Progesterone Patterns in Ethiopian Menz Ewe Lambs | en |
dc.type | Article | en |
local.publisher | College of Agriculture and Veterinary Sciences | en |