; Ramilan, T.; Cranston, L.M. This research was funded by Massey University. [. Kenyon, P.; Morris, S.; McCutcheon, S. Does an increase in lamb birth weight through mid-pregnancy shearing necessarily mean an increase in lamb survival rates to weaning? Skip navigation Sign in. Results suggest that coarse wool-producing farmers should consider a grading up transition to a shedding flock, and the collection of data on the production of Wiltshire–Romney sheep in New Zealand would improve the accuracy of model predictions. With a pre-selection average ewe lamb shedding score of 2.5 and an applied selection intensity of 50%, 20% of first cross ½W½R ewes in the flock had a score between 2.5 and 2.99, 68% had a score between 3.0 and 3.99, and 12% had a score greater than 4.0 (, The first cross ½W½R offspring had an average pre-selection shedding score similar to their parental average, and the shedding score increased to 3.14 with an applied selection intensity of 50% (, Some New Zealand Wiltshire sheep are descendants of crossbreeding of fully shedding Wiltshire Horn and non-shedding Poll Dorset breed sheep; therefore, some New Zealand Wiltshire sheep may not fully shed their fleece [, A normal distribution was assumed in this analysis for the shedding scores of crossbred ewe lambs prior to selection for shedding. All authors have read and agreed to the published version of the manuscript. A bio-economic system-dynamics model of a pastoral sheep farming enterprise was used to simulate this grading up transition from 2580 Romney ewes to a similarly-sized flock of fully shedding third or fourth cross Wiltshire–Romney ewes. It was the second-to-last competition of the pre-Christmas phase of the season, ahead of the new Whangarei A and P Show Shears next Saturday. Cranston, L.; Ridler, A.; Greer, A.; Kenyon, P. Sheep Production. Friday, January 10, 2014. and P.R.K. 187–191. One shearing per year. Corner, R.; Mulvaney, F.; Morris, S.; West, D.; Morel, P.; Kenyon, P. A comparison of the reproductive performance of ewe lambs and mature ewes. Results from the Taranaki Shears at the Stratford A and P Show on Saturday, November 28, 2020: Open final (16 sheep): David Buick (Pongaroa) 13min 17sec, 47.4215pts, 1; Jack Fagan (Te Kuiti) 13min 52sec, 50.1625pts, 2; Gavin Mutch (Scotland) 13min 34sec,50.575pts, 3; Mark Grainger (Te Kuiti ) 13min 46sec, 51.05pts, 4. In Proceedings of the Ruakura Farmers Conference, Hamilton, New Zealand, June 1963; pp. Some Romney fleece may be suitable for wear next to skin (depending on the wearer). [. ; validation, L.J.F., S.T.M., P.R.K. In Proceedings of the New Zealand Society of Animal Production 52, New Zealand, January 1992; pp. Retail Interest Rates on Lending and Deposits-B3. In Proceedings of the New Zealand Society of Animal Production 62, Palmerston North, New Zealand, January 2002; pp. A flock of full-fleeced ewes could be bred to shed all their fleece through the repeated crossbreeding of ewes with shedding rams. ; Morris, S.T. The sheep are a cross of the following breeds. In reality farmers may also select ewe lambs for flock replacement based on other traits such as liveweight and conformation issues. Updates will be posted on Cabin Hollow Metal Art FB page. If this were to occur, the NPVs of grading up transition scenarios would increase relative to the maintenance of the base Romney flock. Breeding ewes to first lamb a year earlier would reduce the generation interval and produce more crossbred ewes each year. Results suggest that it is possible to achieve a grading up whole flock transition from purebred Romney to fully shedding majority Wiltshire based flock within 15 years without large changes in annual sheep feed demand. Considering the current low prices for coarse wool (fibre diameter > 30 µm), a grading up transition to a shedding flock may eliminate wool harvesting costs and increase sheep farm profit. those of the individual authors and contributors and not of the publisher and the editor(s). ; Tozer, P.R. [, Scobie, D.; Bray, A.; O’Connell, D. The ethically improved sheep concept. Farrell, L.J. The statements, opinions and data contained in the journal, © 1996-2020 MDPI (Basel, Switzerland) unless otherwise stated. Taihape teenager Reuben Alabaster had his second win of the season in claiming the senior title, with a margin of more than three points over runner-up and Taranaki rookie competitor Andrew Brown, with third place going to Daniel Biggs, of Mangamahu, in his first senior competition since ending last season as No 1-ranked intermediate nationwide. 28–34. Many are considering if changing to a self-shedding flock, such as a Wiltshire, is a better way forward. This normal distribution was used to predict the change in average shedding score with an applied selection intensity of 50% (, A shedding flock with a similar annual total sheep feed demand to the base Romney flock was achieved after 12 or 15 years of crossbreeding when transitioning to either a ⅞W⅛R or straightbred flock, respectively (, The base Romney flock had an average age of 3.45 years; without replacement ewe lambs entering the flock during the grading up transition (as only crossbred lambs were produced), the average age of the Romney flock increased to 4.46 years before all remaining Romney ewes were culled (, The flocks of the desired final cross each had average ages of more than 3.5 years when transition finished either 13 or 16 years from the start of the transition (, The total annual sheep feed demand was similar in the post-transition self-replacing ⅞W⅛R and straightbred flocks to that of the base Romney flock at approximately 60% of the total farm feed (, During the grading up transition, the total annual sheep feed demand was constrained between approximately 55% and 65% of the total farm feed supply (, After 25 years from transition start, when inter-year fluctuations in sheep COS flocks were relatively small, the sheep enterprise annual COS values of the self-replacing shedding ⅞W⅛R and straightbred flocks were, During the transition, the total ewe numbers increased to as high as 3149 from a base level of 2580 Romney ewes (, Sheep enterprise incomepeaked during transition when all remaining ewes in flocks of differing crosses were culled, reflecting the income generated through their sale (, Between scenarios with different desired final crosses, either ⅞W⅛R or straightbred, NPVs were very similar (within 1% of each other) for all analysed discount rates and periods (, The OPs of post transition flocks (⅞W⅛R and straightbred) were, Production parameters excluding wool production were assumed to be consistent between purebred Romney sheep and the Wiltshire crosses due to few comparative published studies and those available being somewhat old. 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