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Breeding / Calving Issues
Scrotal Circumference
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<blockquote data-quote="Lucky_P" data-source="post: 1292664" data-attributes="member: 12607"><p>Larger SC in yearling animals does have some importance - it's indicative of a 'bigger factory' for production of spermatozoa - and greater capacity for that bull to be able to settle more females. </p><p></p><p>That said, IMO, much of the attention paid to higher/larger SC, with regard to earlier puberty in daughters of a given bull... is overplayed. For every 1cm larger SC a yearling bull has, his daughters reach puberty 0.75 days earlier...</p><p>So what... a heifer sired by a bull with 34cm SC comes into heat about 4 days earlier than one sired by a bull with 28cm SC(I'm just making up numbers, here.) </p><p>I don't WANT heifers cycling before 6 months of age... If they're cycling regularly by 14 months... that's plenty early for my purposes. </p><p></p><p>Have had a couple this year, that were cycling by 5-6 mos; not a desirable situation here... if I'd not actually seen them standing, I wouldn't have known to watch for return to heat(or Lutalysing them) to ensure that they didn't get bred by the one bull calf in their group that had been retained intact for use as a cleanup bull... and might have been surprised with a heifer delivering out-of-synch with the herd... at 14 months of age.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1292664, member: 12607"] Larger SC in yearling animals does have some importance - it's indicative of a 'bigger factory' for production of spermatozoa - and greater capacity for that bull to be able to settle more females. That said, IMO, much of the attention paid to higher/larger SC, with regard to earlier puberty in daughters of a given bull... is overplayed. For every 1cm larger SC a yearling bull has, his daughters reach puberty 0.75 days earlier... So what... a heifer sired by a bull with 34cm SC comes into heat about 4 days earlier than one sired by a bull with 28cm SC(I'm just making up numbers, here.) I don't WANT heifers cycling before 6 months of age... If they're cycling regularly by 14 months... that's plenty early for my purposes. Have had a couple this year, that were cycling by 5-6 mos; not a desirable situation here... if I'd not actually seen them standing, I wouldn't have known to watch for return to heat(or Lutalysing them) to ensure that they didn't get bred by the one bull calf in their group that had been retained intact for use as a cleanup bull... and might have been surprised with a heifer delivering out-of-synch with the herd... at 14 months of age. [/QUOTE]
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