I've been really busy recently with school and livestock projects, so I'm really sorry I'm just getting to these :'(
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Having a buck around would be a good idea for someone with maybe 10-20 does they need to breed, but it's a LOT more logical for me to just take them to a buck every year since I only have 2 breeding does at a time :)
Bucks help people detect heats, and they don't need to worry about carefully monitoring the girls to get them to a buck on time. Plus, it's a lot cheaper for people with a large herd of girls because the breeding fee is $80ish dollars per doe, or it can even be around $200 for fancier bucks, which would quickly turn to thousands of dollars for those with large herds to cover every breeding season. A buck only costs maybe $600ish dollars or less to own every year, though, which is much cheaper and more convenient for those with large herds.
For people like me, though, it only costs about $150 dollars to breed my two girls every year, and having a buck around would be very inconvenient because he'd be stinky, I'd have to make a separate pasture for him, and he'd likely be temperamental because the girls would be so close to him since the only place we have for another pasture is right next to our current one ^^"
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When I want to detect heats in my does, I do bring them a buck rag :)
Basically, I go over to my neighbor's, rub a towel all over her buck in the stinkiest parts (head, belly, front legs, shoulders), and I bring the towel to my girls to sniff. If they're in heat, they'll get very excited, and, if they're not in heat, I leave it out for a bit and they usually come into a heat in a couple days.
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Below this post, there's going to be one of just pictures in a minute ^^