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Preservation Breeding of Lippitt Morgans & Morgan Sport Horses

 

breeding fillies, filly, vs colts

Aliyah Business

R A <toisgeal.rla@gmail.com>

Sep 26, 2022, 9:36 AM

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I have had great luck with making sure my mares are not overweight. Take off high feed substances/fresh grass starting a week before heat cycle. Also start 1/2 cup apple cider vinegar that week and up it to 1 cup per day during heat. If I'm breeding live cover breed every other day and track ovulation so I do not breed on day of ovulation. I had 100% fillies with this (small breeding program over 6yrs). My friend also had excellent luck doing this and her stud loves to give colts.

 

Male semen swim faster and die sooner. Female swims slower but lives longer. So the theory is that if she is covered at the beginning of being fertile and not towards the end of that period, odds are the foal will be a filly. Serving her at the end of her being in season should produce a colt.

My mare was covered only on the last day of being in season and she had a colt. 

(It’s the same for human

 

Breeding as close to ovulation as possible or even after. Could induce ovulation to help with that.

Using chilled semen that is 24 hrs + post collection.

Using a stallion that has a higher percentage of filly progeny.

Using a mare with a healthy body condition and good reproduction health.

None of the things I listed is a guarantee but it could possibly help to increase your chances.

I have a mare that has so far only produced fillies and has been paired with the same stallion. It's probably just luck but I do always breed her right before she ovulates and I use chilled semen that by coincidence has always been pushing the 48 hour post collection mark.

 

when I was researching for a project in college I came across this study that tested the Trivers-Willard hypothesis which states that mothers in better condition produce relatively more sons and that mothers in poorer condition produce relatively more daughters when male reproductive success is more variable. https://www.researchgate.net/.../229196046_Birth_sex...

 

https://www.researchgate.net/publication/229196046_Birth_sex_ratios_relate_to_mare_condition_at_conception_in_Kaimanawa_horses?fbclid=IwAR29RV-dV88m_pSQ9ci3Xgl3X7VHKYWcHwizEfdrjbpZ2yuV-2wS7hoJKWM

 

I’ve heard from some old time breeders to give vinegar to mares for fillies and baking soda to mares for colts… the understanding is that the vinegar makes the mares more acidic to kill off more of the male sperm and the baking soda to help the male sperm. I’d like to know if there is any actual truth or studies done as I have a mare who has had 3 fillies in a row and I want a colt out of her! Lol!

 

Filly plus  there is also a Colt plus both available for fresh cooled as well as one of each for frozen. 

 

A USFS study on the deer population showed that lean forage years resulted in less doelings, more bucks and good forage years resulted in more doelings and less bucks.

During the lush flage times there seemed to be less bucks and more does to service. Their take away from all of this was....

The more the buck was used the more doelings there were the next birthing season.

If the male is used more they seem have more female sperm present which result in more female and less males.

If you want females use the male in the morning for collection and breed him again in the afternoon. And if you want males use the first ejaculated in the morning.

My own experience with breeding pigs seems to support this theory. My female count was 65% females and 35% males. Where if I just let things be I was about 50/50.

 

I bred 6 mares one year and bred them all one time early in their cycle. All came out fillies, did the same thing the following year and got all fillies again. I had one outside mare come in and she was later in her cycle like barely got.her bred before ovulation and it was the only colt

 

There’s been equine research on mares that are over weight and higher on the body score scale have a higher percent chance at producing colts. I think it’s like 5-8% higher. Not much. But there has been scientific research on that subject. I’m at work and can’t take the time to search for the articles, but if you have time I suggest you look for it.

 

I read a study that "said" that the greatest chance to get fillies is when the mare is very young or old.

 

Using an older mare and younger stallion can increase chances

 

** ADMIN MESSAGE **

The only proven (through peer-reviewed research) method of producing a higher percentage of one or other sex foals is through the use of sex-sorted sperm. This technique uses flow-cytometry, however the downside is that it tends to depress overall pregnancy rates. The actual resulting number of sorted sperm is low per-ejaculate, and as a matter of history, deep-horn insemination methods were actually initially developed to enable the use of low numbers of sex-sorted sperm.

There are a variety of old-wives tales which are brought out of the bushes to allegedly produce a higher percentage of one or other sex - we see several of them touted above - but these do not stand up under true scientific investigation. n=1, 2 or even 5 or 6 is not adequate. The fact is that once large numbers of animals are involved, the numbers even out.

As this is a scientific-based group rather than one pursuing Voodoo or other less stellar methods, and as the posts are becoming repetitive, we're going to close the thread. It has been discussed before, so if anyone wants more discussion, take a look at the archives.

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