A comparison of the reproductive performance of ewe lambs and mature ewes

Corner, R.A.; Mulvaney, F. J.; Morris, S. T.; West, D.M.; Morel, P. C. H.; Kenyon, P. R.

doi:10.1016/j.smallrumres.2013.05.018

Cited by 48 publications

(28 citation statements)

References 24 publications

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“…Birthweight of lambs born to younger primiparous dams have been reported to be lighter in comparison to those born to older multiparous ewes (Annett and Carson, 2006;Gardner et al, 2007;Gootwine et al, 2007;Kenyon and Blair, 2014). Weaning weights of lambs born to primiparous dams have also been reported to be lighter than those born to multiparous ewes in most studies (Corner et al, 2013;Terrill, 1945, 1946;Gbangboche et al, 2006;Sidwell and Grandstaff, 1949;Vesely and Slen, 1961). The lower weaning weight is likely to be driven by both the lighter birthweight and lower milk production of the younger primiparous dams.…”

Section: Discussionmentioning

confidence: 97%

Growth rates of Romane ewe lambs and correlated effects of being mated as hoggets or two-tooth ewes on first offspring performance

García

Hazard

2016

Livestock Science

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Section: Discussionmentioning

confidence: 97%

Growth rates of Romane ewe lambs and correlated effects of being mated as hoggets or two-tooth ewes on first offspring performance

García

Hazard

2016

Livestock Science

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“…The lighter birth weights of lambs born to primiparous ewes compared to multiparous ewes can be explained by the fact that the uterus environment of primiparous dams was not fully developed, especially with regard to size (González-García et al, 2015). As a matter of fact, there are many reports about the birth weight differences favoring lambs born to multiparous ewes, and this continues to weaning time (Corner et al, 2013;González-García and Hazard, 2016). On the other hand, it is known that the birth weights of lambs affect BWs and BCSs of ewes at postpartum.…”

Section: Discussionmentioning

confidence: 99%

“…are affected by many genetic and environmental factors. Therefore, reproduction results could not be explained by merely one factor, and so the combined influence of factors should be taken into consideration (Corner-Thomas et al, 2012;Corner et al, 2013). …”

Section: Introductionmentioning

confidence: 99%

Body condition status at mating affects gestation length, offspring yield and return rate in ewes

2018

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Abstract. The present study was planned to determine the effect of ewe body condition score (BCS) and parities on fertility, return rate, gestation length, fecundity, litter size and lamb birth weight. Data were collected from 284 heads of ewes with first to fifth parity and raised at a state farm for three consecutive (2002)(2003)(2004) years. Teaser rams were used to monitor estrus twice daily in the morning and in the evening from September to October. BCSs and body weights (BWs) were recorded at mating and postpartum. The ewes, at mating time in breeding season and within first 6 h after the expulsion of fetal membranes, were divided into four groups on the basis of their BCS: thin (BCS = ≤ 2.0; n = 70; 38), medium (BCS = 2.5-3.0; n = 122; 142), fat (BCS = 3.5-4.0; n = 72; 59) and very fat (BCS = ≥ 4.5; n = 20;17). BCSs and BWs of ewes at postpartum were highly correlated with lamb birth weight (R = 0.486, P < 0.01, and R = 0.130, P < 0.05, respectively). BCSs and BWs of ewes at postpartum had positive effects on lamb birth weight (Y = 3.43 ± 0.10 + 0.130 + 0.047 ewe body condition score (EBCS), P < 0.01; Y = 2.92 ± 0.42 + 0.018 ± 0.009 ewe body weight (EBW), P < 0.05 kg of lamb birth weight per BCS and kilogram of ewe live weight, respectively). The fertility rate, litter size and fecundity were higher in the medium and fat groups than thin and very fat groups (χ 2 = 10.607, P < 0.01). The BW and BCS at postpartum affected gestation length positively (P < 0.05). Return rate or number of coitus for conception were higher (P < 0.05) in thin and very fat groups than medium and fat groups. The data revealed that the ewes with medium and fat body condition (BCS = 2.5-4.0) scores were profitable.

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“…Most likely, the reason for this phenomenon is the body fat degradation serving as a source for more milk production in the heavy ewes. In addition to this, most lighter ewes may be first-time lambing, young ewes with a lack of experience, which might result in poorer maternal care compared to mature ewes (Corner et al, 2013).…”

Section: Live Weights Of Lambsmentioning

confidence: 99%

Effects of ewe live weight and age on reproductive performance, lamb growth, and survival in Central Anatolian Merino sheep

et al. 2015

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Abstract. The aim of this study was to evaluate the effects of premating ewe weight and age on ewe reproductive performance, lamb growth and survival in Central Anatolian Merino (CAM) sheep.The trial included 4935 ewes and 5548 lambs from 23 breeder flocks in Eskişehir Province. The live weights (LWs) and ages of the ewes were recorded 1 week before the mating season. The number of lambs born, fertility rate, multiple birth rate (MBR), and lamb survival rate (SR) at days 75 and 120 were determined. The effects of the LW and age of the ewe were found to be important for the reproductive performance of ewes and for the lamb's growth rate (P < 0.05-0.001). Ewe MBRs and the birth weight (BW) and LW of the lambs at days 75 and 120 increased proportionally with the increase in LW in ewes prior to mating. The fertility rate and MBR were lower (P < 0.05-0.001) in 1.5-year-old ewes than in older ewes. However, lambs' SR at days 75 and 120 were not affected by the premating LW and age of the ewe. In summary, a better reproductive performance and lamb growth rate in CAM flocks may be achieved by the selection of breeding ewes from ewes weighing more than 60 kg.

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A comparison of the reproductive performance of ewe lambs and mature ewes

Cited by 48 publications

References 24 publications

Growth rates of Romane ewe lambs and correlated effects of being mated as hoggets or two-tooth ewes on first offspring performance

Growth rates of Romane ewe lambs and correlated effects of being mated as hoggets or two-tooth ewes on first offspring performance

Body condition status at mating affects gestation length, offspring yield and return rate in ewes

Effects of ewe live weight and age on reproductive performance, lamb growth, and survival in Central Anatolian Merino sheep

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