Hill country sheep production

Jury, K. E.; Hight, G. K.

doi:10.1080/00288233.1973.10421097

Cited by 8 publications

(12 citation statements)

References 25 publications

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“…The differences in ovulation rate and live weight at first 2-year-old oestrus are similar to those previously observed for other productive traits in these flocks (Hight & Jury 1970, 1971, 1973Hight et at. 1973); there is an increase from the Romney to Fi then a decline with interbreeding to third cross (F3) Border Leicester X Romneys.…”

Section: Discussionsupporting

confidence: 74%

“…Additionally, ewes which were tupped very late in the mating (Hight et al 1973). There was, however, a marked increase in ovulation rate from Romneys to crossbreds, the incidence of multiple ovulations increasing from 16.3% to 41.4%…”

Section: Oestrous and Ovulation Datamentioning

confidence: 97%

“…The 7-day-older mean age for F2 over Fi and F3 reflects the difference in mean birth day indicated previously for these sheep (Hight et al 1973). 6 5 7 40 37 4 1 0 RER 5 5 13 43 28 5 0 1 Fl 6 9 19 52 11 1 1 1 F2 5 8 18 49 16 2 1 1 F3 4 7 18 56 13 2 Table 2 gives the percentages of all 2-year-old ewes which showed oestrus for the first time in successive time periods, and those which did not cycle, by flocks.…”

Section: Oestrous and Ovulation Datamentioning

confidence: 99%

“…Previous analysis of more extensive data from these flocks (Hight & Jury 1973) examined the influence of pre-tupping ewe live weight on fertility at successive lambings, and from classification of ewes into live-weight classes indicated that below about 40 kg live weight there was an increase in barrenness at the 2-year-old lambing, and an increase in multiple birth rate with live weight.…”

Section: Hogget Body Weight and Fertilitymentioning

confidence: 99%

“…In part V (Hight et al 1973) of this series, data on the occurrence of oestrus and ovulation rate in Romney and Border Leicester X Romney ewe hoggets were described. Differences between flocks in the proportion exhibiting oestrus, ovulation rate, and live weight were noted.…”

Section: Introductionmentioning

confidence: 99%

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Hill country sheep production

Hight

Jury²

1976

New Zealand Journal of Agricultural Research

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Section: Discussionsupporting

confidence: 74%

Section: Oestrous and Ovulation Datamentioning

confidence: 97%

Section: Oestrous and Ovulation Datamentioning

confidence: 99%

Section: Hogget Body Weight and Fertilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hill country sheep production

Hight

Jury²

1976

New Zealand Journal of Agricultural Research

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Attainment of puberty by ewes in the first year of life is associated with improved reproductive performance at 2 years of age

Edwards

Juengel

O’Connell

et al. 2015

Small Ruminant Research

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Genetic evaluation of crossbred lamb production. 5. Age of puberty and lambing performance of yearling crossbred ewes

Fogarty

Ingham²,

Gilmour

et al. 2007

Aust. J. Agric. Res.

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The age and liveweight at puberty were evaluated in 2155 crossbred ewe lambs at 2 sites over 3 years. A separate dataset examined the lambing performance of 1177 crossbred ewe lambs that were joined naturally at ~7 months of age at 2 sites over 3 years and also their lambing performances in the subsequent 2 years. The ewe lambs were the progeny of Merino dams and sires from several breeds including Border Leicester, East Friesian, Finnsheep, Coopworth, White Suffolk, Corriedale, and Booroola Leicester. Overall, 85% of the ewe lambs reached puberty (detected by teasers) in their first autumn at an average age of 248 days and liveweight of 42 kg. There was significant variation in age and weight at puberty (P < 0.01) among the site and year cohorts of ewes. Sire breed was significant for weight (P < 0.01) but not age at puberty. Of the crossbred ewe lambs joined at 7 months of age, 54% lambed with an average litter size of 1.31 and 49% of lambs were weaned from the ewes joined. There was a significant site effect for all reproduction traits (P < 0.01), with the higher performance at one site associated with higher liveweight at joining. Maternal sire breed was significant for all reproduction traits (P < 0.01) and there was considerable variation between sires within sire breeds. Ewes that reared lambs in their first year weaned 12% more lambs per year in their second and third years compared with ewes that failed to lamb or rear any lambs at 1 year of age. The results demonstrate that lamb weaning rates of 90% or more can be achieved from crossbred ewe lambs with optimal genetics and management. The opportunities for improving productivity by joining crossbred ewe lambs and the selection and management considerations required for successful joinings and lambings are reviewed and discussed.

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Hill country sheep production

Cited by 8 publications

References 25 publications

Hill country sheep production

Hill country sheep production

Attainment of puberty by ewes in the first year of life is associated with improved reproductive performance at 2 years of age

Genetic evaluation of crossbred lamb production. 5. Age of puberty and lambing performance of yearling crossbred ewes

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