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Dairy Farming
Sexed semen in block calving herds
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<blockquote data-quote="farmer on a bike" data-source="post: 6569134" data-attributes="member: 295"><p>We are using sexed semen in our block calved herds. When we sync heifers with Cidrs we put on scratch stickers and serve to the stickers over 2 days and then put the bulls in. Sexed semen has not really changed the conception rate on that have done it on two groups now using 4m/straw sexed semen. We have learnt some bulls are better than others so we use 2 on heifers and 5 overall. On the miklking cows we found poorer conception with first calved heifers and also saw sexed semen conception disproportionately drop when we had a winter dysentery outbreak. Basically it seems conception rates drop disproportionately when cows are stressed in some way.</p><p></p><p>At the other end, calving mostly heifer calves really improves the enjoyment of calving. We choose to use the sexed semen quickly in the first 10 to 15 days, it probably has pulled conception rate down by around 10-12% (my figures don’t really show that due to conception issues with a beef bull), but starting 2 days earlier seems to help correct the effect on the block. </p><p></p><p>Doing the theoretical figures then if you have 300 hundred cows, serve 160 sexed you end up with around 20 extra repeats to first service. 13 get in calf on repeat leaving 7 added to the post 6week calvings, so your 6 week in calf rate drops by 2.3%. At least that is my maths. Potentially you have extra beef cross calves to help make up A bit of cost even at today’s prices.</p></blockquote><p></p>
[QUOTE="farmer on a bike, post: 6569134, member: 295"] We are using sexed semen in our block calved herds. When we sync heifers with Cidrs we put on scratch stickers and serve to the stickers over 2 days and then put the bulls in. Sexed semen has not really changed the conception rate on that have done it on two groups now using 4m/straw sexed semen. We have learnt some bulls are better than others so we use 2 on heifers and 5 overall. On the miklking cows we found poorer conception with first calved heifers and also saw sexed semen conception disproportionately drop when we had a winter dysentery outbreak. Basically it seems conception rates drop disproportionately when cows are stressed in some way. At the other end, calving mostly heifer calves really improves the enjoyment of calving. We choose to use the sexed semen quickly in the first 10 to 15 days, it probably has pulled conception rate down by around 10-12% (my figures don’t really show that due to conception issues with a beef bull), but starting 2 days earlier seems to help correct the effect on the block. Doing the theoretical figures then if you have 300 hundred cows, serve 160 sexed you end up with around 20 extra repeats to first service. 13 get in calf on repeat leaving 7 added to the post 6week calvings, so your 6 week in calf rate drops by 2.3%. At least that is my maths. Potentially you have extra beef cross calves to help make up A bit of cost even at today’s prices. [/QUOTE]
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Sexed semen in block calving herds
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