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Stats - colts vs fillies

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  • Stats - colts vs fillies

    The other thread has got me thinking....why is it that some breeders have these huge runs of either colts or fillies, whilst others get even numbers. I am a breeder in Australia and my stats are similar to Equine Reproduction's.....four fillies from about 40 foals. There must be something we are doing that causes this, when the odds are supposed to be 50:50 every time.

    There was a study done on wild horses where they found that more fillies were born when the mares were losing condition at the time of conception and more colts were born if the mares were gaining condition. Perhaps there's something that happens to the uterine environment during weight loss or gain to favour the male or female sperm....

    So, for the breeders out there, what are your colt v filly stats and do you have any comments to make on the condition (or any other management factor) of your mares?

  • #2
    We are very early in our breeding program so not sure how much weight our stats hold but so far we are 3 out of 3 fillies. I am thrilled with that but have a feeling that this year my mares will be doing the colt thing. We have 2 due this year.
    But if it makes anyone feel better we are 3 out of 3 for chestnut fillies. LOL
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    • #3
      Well I bred two mares last year, one of them was relatively thin (after suffering from colic post-foaling) and the other was... her usual lean self, with a colt at side (which didn't make it though).

      The second is due mid-May, the first, mid-June. A friend came over and said she was betting they were both carrying fillies. So we'll see. So far I've had... 3 colts, 2 fillies and of those, I have only actually bred 2 myself, the others were either a) surprise foal or b) the mare as bought in foal already.

      If I have two healthy fillies and two healthy mares, I think I'll cry with joy.
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      • #4
        I've bred them at all conditions... from a little thin post weaning to quite fat. I haven't found any correlation. I've had 10 foals; 7 fillies, 3 colts. Al fresh or fresh cooled breedings.

        My stallion, however, is exactly 50/50 so far!

        Here are my mares' results (obviously I didn't breed all these foals! Some I don't have anymore. Using barn names to help me keep track.):

        Gracie: 2 fillies, 1 colt.
        Tess: 1 filly.
        Kitty: 2 colts.
        Bailey: 1 filly, 1 colt.
        Dolly: 2 fillies.
        Trea: 5 colts (in a row), 1 filly.
        Katie: 6 fillies, 1 colt.
        Last edited by Dressage_Diva333; Mar. 18, 2011, 01:52 PM.
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        • #5
          One of my stallions has produced consistently for six years predominantly fillies to a variety of mares. He's about 70% girls to boys. Our other stallion, who we've not bred as much, has done about 50/50.

          Apparently there are some stallions that do produce more of one gender than another.

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          • #6
            Has this been a colt or filly year so far?
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            • #7
              2 for 2 colts so far this year. 7 more to go.
              I usually end up pretty close to 50/50 unless I really want a keeper filly. Then it is a colt year.
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              • #8
                I am still in the early stages of developing my program, but so far I have been 5 fillies and 2 colts with 2 coming this April. Mostly I breed and sell the foals, so I don't care much what they are as long as they are healthy and such.

                BUTTTTT this year I have bred a keeper and I don't have a clue what I even want!! Part of me is so hoping for a colt that could be a possible stallion prospect for me to keep, but then on the other hand if it's a filly i don't have to stress about spending the money to get a stallion approved and get a good show record on him not to mention the tons of other stuff I'd need to do to get set up to have a stallion. While I guess I'm hoping for a colt, I am kinda secretly hoping it's a filly. That makes no sense at all!!! At least I won't really care what it is though!
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                • #9
                  Originally posted by Hippie View Post
                  So, for the breeders out there, what are your colt v filly stats and do you have any comments to make on the condition (or any other management factor) of your mares?

                  When doing in-hand breeding and covering mares only on day 3 and 5 I got about 50% each. Have done pasture breeding lately and so far in 4 years, 10 foals, 3 fillies. Used a different stallion this year but pasture bred....8 foals due starting next month so will have to see how that goes.
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                  • #10
                    Our stallion is 15 colts to 4 fillies for the past 6 years. We are expecting 2 more soon and I'd be surprised to see a filly between the mares.

                    Of course my stallion thinks that it's really that a matter of the law of large numbers. If he had more mares to breed, he would be able to show that it really does even out to 50-50 in a larger population.
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                    • #11
                      Out of 7 foals on the ground, 2 have been fillies and 5 have been colts. I have 3 due this year and am hoping for 3 fillies! I had all colts last year. I find that the colts are harder to sell as young horses (of course, once they're riding age, most want geldings).
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                      • #12
                        My maiden mare had a colt this year.
                        I'll be talking to the universe, doing voodoo, worshipping false gods or whatever it might take next year- I want a FILLY

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                        • #13
                          We are fairly new as well...but, we have had three foals and all three were colts. Have one due any moment and one due mid May...
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                          • #14
                            The condition (losing, gaining) thing may be a generality, but when someone like Kathy has had all sorts of mares, all sorts of stallions, AI, LC, fresh, frozen, pretty much throwing out anything that would skew any results, well, what can you say about that? LOLOL

                            I think we've all tried to "blame" Kathy's situation on the water, her timing, SOMEthing she is doing specifically, and it's just all blown aside as being a non-factor.
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                            • #15
                              We have found 0 correlation between colts vs. fillies in regards to the mare's condition at breeding. But we have never attempted to keep a mare thin or fat - just in good condition. Some years we do have a slightly higher ratio in one or the other but it averages out to 50/50 in the 40+ years. That being said, I like to have a foal crop that is a single sex - it makes weaning and dividing the herd simpler down the road in a small way. Here is a rough breakdown since the 70's (that I can remember and/or we kept). There were some larger crops in the 80's but I was disinterested (elementary school has a way of distracting a kid), so I can verify these numbers with my parents.

                              77 - 1 colt, 6 others (3 c, 3 f) lost to Rhino (no vaccine at the time)
                              78 - 2 colts, and there were some other Rhino deaths I believe.
                              79 - 2 fillies that we kept.
                              83 - 1 filly that we kept.
                              84 - 2 colts, 1 filly
                              86 - 2 colts
                              87 - 2 colts, 1 filly
                              88 - 1 colt
                              91 - 1 filly
                              94 - 1 colt
                              95 - 1 colt
                              96 - 2 colts, 1 filly
                              97 - 2 fillies
                              98 - 1 filly
                              99 - 2 fillies
                              2001 - 2 colts, 1 filly
                              2002 - 1 filly
                              2004 - 3 colts, 2 fillies
                              2005 - 1 colt, 2 fillies
                              2006 - 2 colts, 4 fillies
                              2007 - 4 colts, 2 fillies
                              2008 - 2 colts, 2 fillies
                              2009 - 3 colts, 1 filly
                              2010 - 3 fillies
                              2011 - 2 foals are due. I suspect 1 of each.
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                              • #16
                                Originally posted by JB View Post
                                The condition (losing, gaining) thing may be a generality, but when someone like Kathy has had all sorts of mares, all sorts of stallions, AI, LC, fresh, frozen, pretty much throwing out anything that would skew any results, well, what can you say about that? LOLOL

                                I think we've all tried to "blame" Kathy's situation on the water, her timing, SOMEthing she is doing specifically, and it's just all blown aside as being a non-factor.
                                Yeah...^This <lol>. I've done everything but stand on my head and spit nickels. Obviously, we breed for success and not sex, and we have done everything...well..except live cover . But, we have collected and walked across the aisle and inseminated. We've bred mares that pooled lots of fluid several days before ovulation, we've bred AT ovulation with frozen semen, as well as fresh, we've bred POST ovulation (lost shipments that arrive late), we've bred mares on the gain, mares that are losing weight, old mares, young mares, tall mares, short mares...you name it, we've bred it. I'm thinking the odds are in my favor, right? I've got 6 mares due this year, so at least ONE of them should produce a filly, right???

                                The weird part about it is we breed LOTS of outside mares. Lots of them. And statistically, they are pretty much running 50/50 on sexes. It's just my own little corner of the world that the stats are so skewed. Grrrrr....
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                                • #17
                                  Kathy the key is for you to want to have a colt. Then you'll be snowed in with fillies.

                                  I've bred two foals, one filly, one colt. The one that is cooking this year has got to be a filly. I don't just want a mini-Matine, I need a mini-Matine.

                                  Course, because I need a filly I'm not going to get one, am I?

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                                  • #18
                                    Curious, Kathy?

                                    Have you tried feeding the cider vinegar? I did that some years back because my paint stallion was a colt producer and got great numbers of fillies that year, I think it was 5/6 or 6/7 in the filly department that year. I will be trying that again this year with my girls. Typically he would have 6/7 being colts. My old QH stallion was a filly producer, all the way. I think of all of his years breeding, he had maybe 8 colts, ever.

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                                    • #19
                                      Ok,
                                      I will play.
                                      20 foals: 15 colts, 4 fillies.
                                      This year I really don't care but next year I would like to keep a filly back...odds are not too good are they?
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                                      • #20
                                        With a total of 17 foals, 13 fillies and 4 colts. Still hoping my filly streak continues!
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