Natural factors affecting puberty and reproductive performance in ewe lambs: A reviewFacteurs naturels influençant la puberté et les performances de reproduction des agnelles: revue bibliographiqueEinwirkung von umweltfaktoren auf die Pubertät und die reproduktionsleistung bei weiblichen lämmern: ein ubersichtsreferat
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Cited by (58)
Breeding ewe lambs successfully to improve lifetime performance
2014, Small Ruminant ResearchCitation Excerpt :Lastly, it briefly summarises the known long term effects of being born to a ewe lamb on lifetime productivity. Ewe lambs can display shorter less intense oestrus periods (Dyrmundsson, 1973; Edey et al., 1978; McMillan and Parker, 1981; Schick, 2001) and are less likely to seek and stand for the ram in comparison to mature ewes (Dyrmundsson, 1981; Smith and Knight, 1998) which has resulted in them being termed ‘shy’ breeders. This ‘shy’ breeding is illustrated by the results of Allison et al. (1975), who reported that ewe lambs need to be served by the ram on at least three occasions before 100% of ewe lambs actually have semen inside their reproductive tract.
A comparison of the reproductive performance of ewe lambs and mature ewes
2013, Small Ruminant ResearchCitation Excerpt :Farmers have stated poor and varied reproductive performance as a limiting factor for breeding ewe lambs (Kenyon et al., 2004b). In comparison to mature ewes, ewe lambs have been reported to display lower rates of ovulation, conception and lower embryonic survival, and give birth to fewer lambs which have lower birth weights and survival to weaning (Dyrmundsson, 1981; Davies and Beck, 1993; Beck et al., 1996; Annett and Carson, 2006). A lower number of lambs weaned per ewe lamb results from some components of overall reproductive output being compromised (Donald et al., 1968; Annett and Carson, 2006; Munoz et al., 2009).
Management of pre-pubertal small ruminants: Physiological basis and clinical approach
2012, Animal Reproduction ScienceCitation Excerpt :Heavier ewe-lambs show increased ovulation rate than lighter animals at the same age; these effects persist during the second breeding period albeit with the same amount of feed (Bizelis et al., 1990). Even more, appropriate energy nutrition at late-pregnancy seems to be more critical in pregnant ewe-lambs than in the adult ewes (Dyrmundsson, 1981). Apart from post-natal nutrition, maternal nutrition may also impact on offspring's reproductive function, including timing of puberty onset, a phenomenon known as foetal or developmental programming (Kotsampasi et al., 2010).
Effect of genotype at the MTNR1A locus and melatonin treatment on first conception in Sarda ewe lambs
2010, TheriogenologyCitation Excerpt :The reduction of unproductive time which passes between the birth of a ewe lamb and its first lambing is one of the major targets in sheep management. Many factors are involved in the attainment of puberty in ewes, but age, body weight, and photoperiod are the most significant [1]. Once lambs have reached optimal age and body weight, decreasing day-length creates the conditions for endocrine events which lead to oestrus, ovulation, and subsequent pregnancy [2].