Reproductive response of mature and nulliparous yearling ewes to the ram effect during the non-breeding season

2016 ◽  
Vol 140 ◽  
pp. 37-39 ◽  
Author(s):  
R. Ungerfeld
Keyword(s):  
Breeding Season ◽  
Reproductive Response ◽  
Ram Effect

The effect of management history and time of mating on ovulation and lambing rates in mule ewes

1995 ◽  
Vol 1995 ◽  
pp. 95-95
Author(s):  
Linda M Mitchell ◽  
Margaret E King ◽  
R.P. Aitken ◽  
Jacqueline M Wallace
Keyword(s):  
Breeding Season ◽  
Seasonal Variations ◽  
Ovulation Rate ◽  
Endogenous Rhythm ◽  
Nutritional Requirements ◽  
Embryo Survival ◽  
Management History ◽  
Reproductive Response ◽  
Per Se ◽  
Natural Breeding

There is increasing interest in the development of later lambing systems for crossbred ewes which more closely match ewe nutritional requirements with herbage growth (Stone, 1988; Mitchell, 1990). It has long been recognised however that at extremes of the natural breeding season fecundity is reduced, a possible consequence of seasonal variations in ovulation rate, fertilisation and/or embryo survival (Hammond, 1944). Daylength is the factor which entrains the endogenous rhythm of reproduction in sheep (Donovan, O’Callaghan, Karsh, Boland and Roche, 1992) and daylength changes per se may be responsible for variations in reproductive response throughout the breeding season. Associated environmental and management factors may also be of importance. The objective of the present study was to determine the effect of management history and month of mating on ovulation and lambing rates in Mule ewes.

Ram effect: Adult rams induce a greater reproductive response in anestrous ewes than yearling rams

2008 ◽  
Vol 103 (3-4) ◽  
pp. 271-277 ◽  
Author(s):  
R. Ungerfeld ◽  
M.A. Ramos ◽  
S.P. González-Pensado
Keyword(s):  
Reproductive Response ◽  
Ram Effect

scholarly journals Hormonal treatments and the ram effect on synchronised oestrus in Awassi ewes at the beginning of the breeding season

2005 ◽  
Vol 48 (4) ◽  
pp. 473-480 ◽  
Author(s):  
Mufeed Alnimer ◽  
Mohammad J. Tabbaa ◽  
Mohammad Amasheh ◽  
Husein Alzyoud
Keyword(s):  
Breeding Season ◽  
Ram Effect ◽  
Hormonal Treatments
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