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holestein bulls
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<blockquote data-quote="ANAZAZI" data-source="post: 707859" data-attributes="member: 7541"><p>I will try to explain, or mess things up.</p><p>Basically, you get what you breed for. If AI breeders favours really big cows, than big cows will develop. Even if a more moderate size could be better at herd level, a big cow is more likely to produce more as an individual and that is were milk numbers come from.</p><p></p><p>As to mean bulls: if lots of bulls are kept around (for breeding and meat production); there is a tendecy to cull the mean bulls and use the nice ones for breeding. But if the breed is a strictly dairy breed (holstein or jersey) that is mostly AIed and most bulls are either castrated or killed as young. Because of the long breeding for dairy type (against muscle) there is no loss to castrate them either. No culling takes place for disposition traits in bulls.</p><p>If on the other hand bulls are most useful as beef producers like in swedish reds, normande or brown swiss, the bulls are kept around to full size and most are kept intact. even if fathers were AI sires they will be culled if they breed mean sons.</p><p>And beef breeds culling takes place in the same manner; and even if you americans castrate many, there are herd sires and prospects around and these are culled for disposition.</p></blockquote><p></p>
[QUOTE="ANAZAZI, post: 707859, member: 7541"] I will try to explain, or mess things up. Basically, you get what you breed for. If AI breeders favours really big cows, than big cows will develop. Even if a more moderate size could be better at herd level, a big cow is more likely to produce more as an individual and that is were milk numbers come from. As to mean bulls: if lots of bulls are kept around (for breeding and meat production); there is a tendecy to cull the mean bulls and use the nice ones for breeding. But if the breed is a strictly dairy breed (holstein or jersey) that is mostly AIed and most bulls are either castrated or killed as young. Because of the long breeding for dairy type (against muscle) there is no loss to castrate them either. No culling takes place for disposition traits in bulls. If on the other hand bulls are most useful as beef producers like in swedish reds, normande or brown swiss, the bulls are kept around to full size and most are kept intact. even if fathers were AI sires they will be culled if they breed mean sons. And beef breeds culling takes place in the same manner; and even if you americans castrate many, there are herd sires and prospects around and these are culled for disposition. [/QUOTE]
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