15 years ago the Growbulk sheep offered a new and significant dual purpose option for commercial farmers wishing to fast-track production gains and genetic efficiencies.
Perendale / Growbulk
Initially developed on Whatawhata’s steep King Country hills with its challenging summer dry climate the Growbulk is destined for a return to the hills as the dairy expansion pushes sheep operations further from the plains and rolling hills. For the last two years Rosedale has trialled a Perendale/Growbulk cross for those hill farmers wishing to concentrate on their preferred Perendale breed but with the chance to introduce the muscling, growth and survival genes from the Growbulk. With Rosedale Growbulks already proven on hill stations throughout the South Island the Perendale/Growbulk cross provides an option to introduce the production genes and then stabilise back to the Perendale base breed. Perendale/Growbulk rams will be available this breeding season.
Charolais / Growbulk
2015 is the 4th year we have used Charolais genetics as a terminal option. Developed separately from our dual purpose Growbulk sheep, it provides a focus simply on maximum meat production. While possessing many of the same growth and muscling traits of the Growbulk, the Charolais cross hasn’t had the same selection history on fleece weight so we prefer to develop the Growbulk/Charolais as a terminal option.
Merino / Growbulk
Our other exciting development is the Halfbred Joint Venture breeding programme we are involved in with the Nine Mile Merino Stud. At Nine Mile Gordon and Spin Lucas and Studmaster Jane Rive have for the last 15 years been following a breeding programme with their Merinos parallel to what Rosedale has been focusing on with its Growbulk sheep. Emphasis on muscling, growth, constitution and confirmation at Nine Mile from the fine wool Merino has been the focus to breed a true Dual Purpose Merino. In both the Merino and the Growbulk sheep, visual muscularity representing superior growth and muscling characteristics is the link between superior fertility, survivability and both pre and post weaning growth weights. It further represents superior Ewe Efficiency and Ewe Longevity. For us at Rosedale, Nine Mile is the perfect and preferred partner to be involved with as we jointly evaluate and develop an exciting new Halfbred option for the dryer hills of the South Island.
The Growbulk cross over the Merino offers unique production characteristics unavailable from any existing Halfbred cross. The Myomax and Loinmax muscling genes in the Growbulk translate to a faster growing, higher yielding carcase. The finer micron high bulk wool from the Growbulk is also better suited to meet the finer wool specification required for options like the SmartWool contract. This year a Nine Mile Merino ram has been used over 130 stud ewes at Rosedale while a Rosedale Growbulk ram has been used over Nine Mile Merino ewes at Tarras. Initial evaluation will assess the relative performances of the different crosses particularly under the differing environments. Ewe lamb progeny from both will form the basis of a fully SIL recorded ‘Pure Taste’ Halfbred stud.
What We've Achieved
- No. 1 NZ rank for Lamb Survival
since 2003 measuring Lamb Viability at Birth.
and 3 times finalist in New Zealand’s Tastiest Lamb
SILACE as Trait Leader
for Dual Purpose Meat Yield.
- Plan B People & Planet
We now offer a 5% donation from all rams sold to a charity, school, sports club, etc of your choice.
400 sale ram hoggets
tested with 5K SNP Chip(inc Myomax and Loinmax muscling genes.