Reproductive responses associated with ram introduction in mature tropical Menz ewes after a period of isolation
References (27)
- et al.
Plasma progesterone concentrations in superovulated heifers determined by enzyme immunoassay and radioimmunoassay
Br. Vet. J.
(1985) - et al.
Effects of boar pheromones, ram's wool and presence of bucks on ovarian activity in anovular ewes early in the breeding season
Anim. Reprod. Sci.
(1983) - et al.
The physiological responses of anovular ewes to the introduction of rams-a review
Livestock Prod. Sci.
(1986) - et al.
The reproductive performance of Ethiopian highland sheep
Anim. Reprod. Sci.
(1988) - et al.
Effect of the method of estrus synchronization and PMSG dosage on estrus and twinning in Ethiopian Menz sheep
Theriogenology
(1992) - et al.
Reproductive response of mature ewes of different breeds to teasing prior to mating
Small Rumin. Res.
(1990) - et al.
The influence of nutrient status of postpartum ewes on ovarian cyclicity and on the oestrous and ovulatory responses to ram introduction
Anim. Reprod. Sci.
(1990) - et al.
Increased ovulation rate at the ram-induced ovulation and its commercial application
Use of teasing in an AI programme
- et al.
Ram influence on ovarian and sexual activity in anoestrous ewes: effects of isolation of ewes from rams before joining and date of ram introduction
J. Anim. Sci.
(1992)
Sheep germplasm in Ethiopia
UNEP/FAO Animal Genetic Resources Newsletter No. 1
Synchronisation of oestrus in sheep of low-normal mass under range conditions: the use of different progestagens and PMSG
South Afr. J. Anim. Sci.
A note on the effect of the direction of liveweight change about the time of mating on reproductive performance of Greyface ewes
Anim. Prod.
Cited by (3)
Investigation of ram effect and eCG usage in progesterone based oestrous synchronization protocols on fertility of ewes following fixed time artificial insemination
2020, Small Ruminant ResearchCitation Excerpt :It is however worth noting that studies which used short-term P4 and reported a higher proportion of ewes lambing to the first service period than what was obtained in the present study used PGF2α at the end of the treatment period (Martemucci and D’Alessandro, 2011; Fleisch et al., 2012) and intrauterine or natural methods of breeding (Fukui et al., 1994; Martemucci and D’Alessandro, 2011; Fleisch et al., 2012), which was possibly the reason for better lambing performance observed in these studies. Whereas other researchers who studied fertility following short-term P4 treatment did not report on the proportion of ewes which lambed to the first service period (Viñoles et al., 2001; Ali et al., 2009), suffice to say that benefits of oestrus synchronization using various protocols can only be fully realised when ewes which conceive carry their foetuses to term (Mukasa-Mugerwa et al., 1994). In conclusion, this study has shown that eCGshort, eCGlong, Ramshort and Ramlong oestrus synchronization protocols had similar effectiveness on oestrus synchronization and fertility, although the proportion of ewes lambing to the first service period in the Ramshort group was lower.
Reproductive performance and productivity of Menz sheep in the Ethiopian highlands
1995, Small Ruminant Research