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Why a cross breed Bull
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<blockquote data-quote="Aero" data-source="post: 519561" data-attributes="member: 2076"><p>For commercial herds who have a plan and have stuck to it over the years, there is probably less usefulness in an F1 bull. For the herds who have used a different breed every year and changed types like the wind (and presumptively retained females), an F1 bull program might be what is needed.</p><p></p><p>the common method of crossbreeding is to rotate a set number (2 or 3) of breeds through the sire lineup. This is good over time but inherently results in retained females of different breed makeups but usually makes for a pretty consistent group after some years.</p><p></p><p>using a crossbred bull for the first time on a mixed up herd will not get you any better results than if you just chose another breed of bull... but: the next year you choose another (unrelated) crossbred bull of the same breed makeup. Repeat annually until you have a stabilized group and then start rotating purebred bulls of the same makeup as the crossbred bull. </p><p></p><p>the whole reason to use F1 bulls is to stabilize a group because you can use the same breed makeup without losing a significant amount of heterosis. If I remember correctly, I read that using the same F1 cross for 4 consecutive years and retaining all females showed a 79% retention of heterosis as compared to the first year using an F1 bull. after retaining some females for 4 years, you should have a pretty consistent group of cows to go into a normal rotation of the purebred bulls that made the F1 bulls.</p><p></p><p>Do yourself a favor; choose breeds and stick to it for a reasonable amount of time. NOTE: 1 breeding season is not a reasonable amount of time. 5+ years is.</p></blockquote><p></p>
[QUOTE="Aero, post: 519561, member: 2076"] For commercial herds who have a plan and have stuck to it over the years, there is probably less usefulness in an F1 bull. For the herds who have used a different breed every year and changed types like the wind (and presumptively retained females), an F1 bull program might be what is needed. the common method of crossbreeding is to rotate a set number (2 or 3) of breeds through the sire lineup. This is good over time but inherently results in retained females of different breed makeups but usually makes for a pretty consistent group after some years. using a crossbred bull for the first time on a mixed up herd will not get you any better results than if you just chose another breed of bull... but: the next year you choose another (unrelated) crossbred bull of the same breed makeup. Repeat annually until you have a stabilized group and then start rotating purebred bulls of the same makeup as the crossbred bull. the whole reason to use F1 bulls is to stabilize a group because you can use the same breed makeup without losing a significant amount of heterosis. If I remember correctly, I read that using the same F1 cross for 4 consecutive years and retaining all females showed a 79% retention of heterosis as compared to the first year using an F1 bull. after retaining some females for 4 years, you should have a pretty consistent group of cows to go into a normal rotation of the purebred bulls that made the F1 bulls. Do yourself a favor; choose breeds and stick to it for a reasonable amount of time. NOTE: 1 breeding season is not a reasonable amount of time. 5+ years is. [/QUOTE]
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