Breeding doelings: What Age Is Best?
You can breed the first fall, but should you?
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When is the best age for breeding doelings? Is it okay to breed them their first fall, or better to wait until they’re yearlings and have had a chance to put on more growth?
At what age can a doeling be bred? For us at Kopf Canyon Ranch, we ask a different question: At what age should a doeling be bred, considering her physical, mental, and developmental readiness?
Individual goats reach maturity at different times and grow at different rates. Some breeds mature earlier than others. According to the Merck Veterinary Manual, “Does reach puberty at 6 to 9 months old but should weigh 60 to 65% of their mature body weight (or their dam’s mature body weight) before breeding.” Many producers adopt a more conservative approach, waiting until does reach 70 to 80% of their mature body weight, which adds a margin of safety regarding their health and reproductive success.
Just because you can, doesn’t mean you should.
In our herd, does aren’t bred until they’re 18 months old. We pasture kids without assistance in a large herd. Due to our management style, we require our goats not only be physically ready to breed but also mentally prepared to raise their kids. There’s a significant difference—both physically and behaviorally—between a yearling and a two-year-old doe. The latter tends to be calmer, more maternal, and better equipped to handle the stressors of birth and lactation.
By delaying breeding doelings, we allow our yearlings to become active observers of the complex process of kidding and raising offspring. Our herd is organized into tight-knit family units—dam, daughter, granddaughter—not just for the benefit of herd cohesion, but because these relationships foster essential social learning. Within these units, maternal behaviors are modeled and mimicked in ways that prepare younger does for future motherhood. The units often sleep together, travel together to forage, and task the yearlings with babysitting younger siblings. As a result, when they kid the following year, the process—outside of the physical sensation—isn’t foreign to them. They know what bonding looks like and how to care for their offspring.
Lost time really isn’t lost.
Some might argue that delaying kidding will reduce the productivity of the herd, especially if breeding doelings is postponed by nearly a year. However, this prediction hasn’t matched our experience. Contrary to expectations, our first fresheners consistently exceed productivity norms. While it’s common to assume that young does will kid singles, we’ve found otherwise. This year, we had 33 2-year-old does freshen for the first time, with a kidding percentage of 250%, averaging 2.5 kids per doe. They raised their kids unassisted. In fact, we regularly see first-fresheners successfully raise triplets—and even quads.
Pregnancy and lactation take a significant toll on the body’s energy reserves. Growth also requires a significant amount of energy and reserves in a young doeling. We breed for kidding in March or April. This means our does are pregnant during winter, which is often bitterly cold in our area. Cold temperatures place an additional demand on the body’s energy stores. Expecting a doeling to consume enough feed to grow, stay warm, and sustain a pregnancy, then lactate is expecting a lot. If energy demands exceed supply, the doe is at risk for pregnancy toxemia, a severe metabolic disorder that most commonly strikes in late gestation and can quickly become life-threatening if untreated.
Beyond energy requirements, calcium plays a crucial role in overall health. Our goats navigate rugged canyon terrain, and must be sound and athletic to thrive. A doe that isn’t receiving adequate calcium will have decreased bone density and be more prone to injury. There are three life stages where calcium demand increases: growth, gestation, and lactation. Having a doeling experience all three sets the stage for deficiency, unless she’s carefully supplemented, which can result in pregnancy, delivery, and lactation problems. Fragile bones are just one aspect of the risks associated with calcium deficiency. Hypocalcemia is another life-threatening and preventable metabolic emergency. Inadequate calcium can also impair fetal development, weaken uterine contractions during birth, and reduce milk production.
Some things are worth the wait.
Waiting until a doeling is 18 months old to breed allows her to utilize all available calcium stores, giving her bones and teeth time to develop and mature fully. In our experience, the year “lost” by delaying breeding is more than gained in the longevity and vitality of the doe. We rarely see any negative impact on growth rate during pregnancy and lactation. Even without additional supplementation, our yearlings continue to grow robustly, while early-bred doelings often show setbacks in development. That differential has long-term implications for the doe’s future health, performance, and longevity in the herd.
These observations aren’t just anecdotal—they’re validated by the meticulous data we keep on our herd’s growth and productivity metrics.
For example, Matzah, a doeling bred as a yearling, kidded a single kid and experienced a noticeable growth setback.
In contrast, Cassie, who wasn’t bred early, showed consistent and uninterrupted growth.
Kaiserin gave birth to twins at two years old, and her growth trajectory remained consistent—pregnancy didn’t set her back at all.
“Lost” years can offer more profit in the long run.
Can a doeling bred early still thrive? Yes, and many do—provided they’re supported through intensive, targeted management practices. Meeting the nutritional demands of both energy and calcium is just the beginning. There are other logistical and medical factors to consider. A doeling is more likely to require assistance during delivery. She may need a kidding jug—a protected, quiet area for birth and bonding—which can help reduce stress. Dystocia, or difficult birth, is more common in young does whose pelvic openings are’t fully developed. If the size of the kid exceeds the capability of the pelvis, intervention becomes necessary—sometimes through assisted delivery, other times via cesarean section. If you don’t have a veterinarian, establish a relationship before an emergency arises.
While many would argue that it’s not profitable to “feed what you can’t breed,” we find that waiting a year results in better outcomes, less intensive management requirements, fewer emergencies, better longevity, and higher kidding rates, which far offset the “lost year.” Breeding doelings shouldn’t be a decision based solely on age or a weight threshold. Breeders should consider the emotional maturity, nutritional readiness, and broader life-stage needs of each individual animal. At Kopf Canyon Ranch, our philosophy of intentional delay yields strong, confident mothers and a herd that thrives both physically and socially.
Karen Kopf and her husband, Dale, own Kopf Canyon Ranch in Troy, Idaho. They raise Kiko goats, enjoy “goating” together, and helping others goat. You can learn more about them at Kopf Canyon Ranch on Facebook or kikogoats.org
Originally published in the August 15. 2025 digital issue of Goat Journal.
