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Livestock & Forage
Inverdale Gene (Aberdales)
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<blockquote data-quote="Global ovine" data-source="post: 7560364" data-attributes="member: 493"><p>Totally agree with the last sentence ......</p><p>The inclusion of the Inverdale gene not only makes the ewe flock a terminal flock (not for breeding as one would in a self replacing flock) but often increases the scanning rate (hence incidence of triplets etc.) into levels beyond that desired by farmers. The 0.4 of a lamb increase in average litter size can be excessive if the crossed flock has already reached the peak of ewes twinning within a flock. Half of that rate would suit most people, therefore GDF9 is now a very useful option.</p><p>The thing with single genes is the results are manifested in the subsequent generations (except Inverdale) meaning selection by performance can be easily instigated to maintain performance.</p><p></p><p>Having been involved in the selection of sheep for export from NZ, it was good to receive the latest scanning results from [USER=731]@easyram1[/USER] that demonstrated that selection for breeding goals delivers the desired results. His flock of 300 NZ Texels (selected for both maternal traits and meat) scanned 198% including 4 empties. His 400 NZ Suffolks (a terminal only breed in NZ) scanned 186% and his 300 Suftex ewes (selected only for terminal traits in NZ) scanned 175%. This range matched my expectations based on the background selection policies of the flocks that contributed to the importations to the UK.</p><p></p><p>Single genes, or sometimes referred to as Major Genes can be very useful, but breeders goals are very potent. The superiority of the Texels in the example above is probably influenced by GDF9 (being present in the NZ source flocks), but many genetic causes of higher ovulation rate and maybe embryonic survival will accumulate in flocks that have specific goals of increasing lambing %.</p><p></p><p>Therefore don't consider all breeders of a breed having uniform performance.</p></blockquote><p></p>
[QUOTE="Global ovine, post: 7560364, member: 493"] Totally agree with the last sentence ...... The inclusion of the Inverdale gene not only makes the ewe flock a terminal flock (not for breeding as one would in a self replacing flock) but often increases the scanning rate (hence incidence of triplets etc.) into levels beyond that desired by farmers. The 0.4 of a lamb increase in average litter size can be excessive if the crossed flock has already reached the peak of ewes twinning within a flock. Half of that rate would suit most people, therefore GDF9 is now a very useful option. The thing with single genes is the results are manifested in the subsequent generations (except Inverdale) meaning selection by performance can be easily instigated to maintain performance. Having been involved in the selection of sheep for export from NZ, it was good to receive the latest scanning results from [USER=731]@easyram1[/USER] that demonstrated that selection for breeding goals delivers the desired results. His flock of 300 NZ Texels (selected for both maternal traits and meat) scanned 198% including 4 empties. His 400 NZ Suffolks (a terminal only breed in NZ) scanned 186% and his 300 Suftex ewes (selected only for terminal traits in NZ) scanned 175%. This range matched my expectations based on the background selection policies of the flocks that contributed to the importations to the UK. Single genes, or sometimes referred to as Major Genes can be very useful, but breeders goals are very potent. The superiority of the Texels in the example above is probably influenced by GDF9 (being present in the NZ source flocks), but many genetic causes of higher ovulation rate and maybe embryonic survival will accumulate in flocks that have specific goals of increasing lambing %. Therefore don't consider all breeders of a breed having uniform performance. [/QUOTE]
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Inverdale Gene (Aberdales)
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