Goat Breeding Program: How to Plan Timing, Records, and Kidding Season

Turn a buck in with your does this week and you'll have kids on the ground in mid March. That's not a guess, it's subtraction.

A goat breeding program is mostly arithmetic and a notebook. The arithmetic is gestation, the heat cycle, and body weight. The notebook tells you which does earn their hay. If your grazing plan isn't set, see our guide to rotational grazing for small livestock.

How long are goats pregnant, and how do you count to a kidding date?

Goat gestation runs 146 to 155 days, about 150 on average, per Oklahoma State University Extension and the Merck Veterinary Manual. That's the only number you have to memorize. The rest of the calendar hangs off it.

Work it from both ends. Count 150 days forward from the breeding date for a due date, or 150 days back from the week you want kids for the week the buck goes in. A doe bred October 16 is due March 15, and the full range puts the watch window at March 11 through March 20.

Two more numbers make those dates reliable. Does cycle every 18 to 22 days, 21 on average, and heat lasts only 12 to 36 hours. NC State Extension says ovulation comes 12 to 36 hours after standing heat starts, and Langston University adds that sperm stay viable about 12 hours. That narrow window is why 40 to 45 days of buck exposure is standard.

Why is fall the breeding window for goats?

Because most goats are short-day breeders, and shortening daylight is what starts does cycling. Langston University ties the breeding season to the annual change in day length, and the published seasons agree closely: Langston gives August through January, NC State gives September through February, and Oklahoma State puts seasonal anestrus at February through July. Mid October sits in the middle of all three, which is why fall breedings settle so easily.

Exceptions matter if you own one. eXtension says Nigerian Dwarf goats breed year round, and Merck notes seasons run longer nearer the equator. Breeding out of season costs conception rate, so treat it as a choice with a price.

How old and how big should a doe be at her first breeding?

Big enough, which is a weight question, not an age question. NC State Extension says does should not be bred until they reach 60 to 75 percent of expected mature weight. Merck gives 60 to 65 percent, and Oklahoma State puts puberty at 7 to 10 months for does, 4 to 8 for bucks.

Age alone will lie to you. Langston gives puberty anywhere from 120 to 230 days depending on nutrition, breed, and birth season, so two doelings born the same week can be 20 pounds apart in October.

Breeding her early has a price. A doeling is still growing, and the fetus wins the competition for nutrients. You get a smaller mature doe and a harder first kidding. Waiting a season costs one kid crop. Breeding too early can cost her whole productive life. So weigh them. A weight tape beats an eyeball.

How do you choose a buck, and how many does can he cover?

Half your herd's genetics walk in with one animal, so buy on records, not looks. Penn State Extension calls estimated breeding values the preferred selection parameter, and warns that single-trait selection costs you other traits.

Buck power and the ratio

Published ratios spread wider than people expect:

• NC State and Oklahoma State's kidding chapter: 1 buck per 20 to 30 does.

• Oklahoma State's buck chapter: a full-grown, healthy buck should easily service up to 50 does.

• Langston University: 30 to 50 does on pasture, but only 5 to 15 if the does are estrus synchronized.

Terrain and buck age move it, and yearlings get fewer.

Soundness and the inbreeding rule

Langston says evaluate bucks 3 to 4 weeks before mating, with 20 to 25 cm of scrotal circumference as adequate. Have your vet run that breeding soundness exam before the season, not during it.

Then the simplest genetic discipline there is. Oklahoma State puts it plainly: bucks should not be bred to their daughters, because inbreeding tends to expose genetic problems and lead to weaker stock. Keeping a buck kid out of your own does is how small herds quietly go backward. Buy, lease, or trade.

What body condition should a doe be in before breeding?

Lean and hard, neither thin nor fat. Langston University scores goats 1.0 to 5.0 in half points, and says does should score at least 2.5 and no more than 4.0 at the start of breeding. Score by hand over the spine, ribs, and loin, because a winter coat hides everything.

Both ends breed badly. Langston notes undernourished and overly fat does are both prone to pregnancy toxemia, and a thin doe may not cycle at all. Check which scale somebody is quoting: NC State's breeding protocol article calls ideal condition a 5 or 6, which is a 1 to 9 scale. Same animal, different rulers.

Flushing is the fix for a thin doe, with limits. Langston says put poor-condition does on a gaining plane of nutrition 2 to 3 weeks before breeding, and Merck gives 2 to 4 weeks, citing a New Zealand ewe study that found a 25 percent rise in ovulation rate from an extra kilogram of dry matter a day. Merck also says raising a score by 1 point takes about 6 weeks, so October is late to fix a thin doe. Our guide to growing and storing your own livestock feed covers the cheap end.

What pre-breeding health work should a vet drive?

All of it, honestly. Logan Pierce is a pen name, not a veterinarian, and everything here is a conversation for your own vet and extension agent, because several answers change by region.

Herd disease testing

For caprine arthritis and encephalitis, Merck says the main route is kids drinking infected colostrum or milk, and recommends serologic testing every 6 months and culling positives over time. Caseous lymphadenitis is the one that follows new animals home: Merck calls it not a curable disease, says culling affected animals is the best way to clear it, and notes the organism survives in soil for 8 months. Only seronegative animals with no sign of lesions should enter the herd, and Johne's belongs on the same pre-purchase list.

Parasites and the resistance problem

The American Consortium for Small Ruminant Parasite Control states flatly that in the US there is now resistance to all of the dewormers used in small ruminants, varying by region and farm. Resistance exists when deworming fails to cut fecal egg counts by more than 95 percent, severe resistance when it fails to cut them by more than 60 percent.

That's why FAMACHA exists: a card matching lower eyelid color to anemia level, so you treat the animals that need it instead of the whole herd. Copy Oklahoma State's timing too. Deworm before the buck goes in, not during days 20 to 60 of pregnancy, and not in the 2 to 3 weeks before kidding.

Vaccines and minerals

Merck and NC State both say vaccinate does 4 to 6 weeks before kidding, typically with CDT. Oklahoma State says 2 to 4 weeks. Follow your vet's protocol rather than splitting the difference.

Minerals are where guessing gets dangerous. eXtension lists selenium at 0.1 to 20 ppm without separating requirement from toxicity, and notes it runs deficient in many areas from low soil. Copper is listed at 10 to 80 ppm, with the warning that many areas carry high molybdenum, which blocks absorption. We won't turn those ranges into a dose. Get a forage test, then ask your extension office.

How should you feed a bred doe through 150 days?

Flat for 100 days, then carefully upward. eXtension says most fetal and mammary growth happens in the last trimester. Until then, decent forage and a mineral do the job.

The last 6 weeks hold the money and the risk. eXtension says increase grain slowly across those weeks, reaching at least 1 percent of body weight in grain on a dry matter basis before kidding, at a minimum of 10 percent crude protein as fed.

Two things kill does at the end. The first is pregnancy toxemia. Merck says most cases develop 1 to 3 weeks before kidding, that it hits does carrying multiple fetuses hardest, each fetus needing 30 to 40 grams of glucose a day, and that case fatality rates over 40 percent are not unusual even with treatment. Their prevention line belongs on the barn wall: does should not enter the last 6 weeks below a body condition score of 2.5 out of 5.

The second is hypocalcemia, or milk fever. eXtension names high dietary calcium in late gestation, especially legume hay, plus high potassium. Water intake climbs late too, which our piece on livestock water requirements covers.

What records does a goat breeding program actually need?

Fewer than you think, kept every time instead of most times. eXtension's goat program publishes the working list: animal ID, birth date, birth weight, sire, dam, number born, birthing difficulties, kiddings, number weaned, and total pounds weaned.

Write the breeding date down the day it happens, and the due date beside it. A date you reconstruct in February is a guess wearing a number. Langston says change the marking harness crayon color after 15 to 20 days, so a doe remarked in the new color did not settle.

Then they have to earn their keep:

1. Number of kiddings. eXtension says this is what lets you cull does that don't kid every year. Usually the highest-value line in the book.

2. Number weaned, not number born. eXtension is blunt: kids born matter, kids weaned matter more. A doe with triplets who raises 1 isn't a triplet doe.

3. Adjusted weaning weight. Weigh kids at weaning, generally 60 to 90 days, then run Penn State's adjusted 90-day formula so kids out of different does compare fairly.

One honest gap: we looked for a federal figure on how many US goat operations keep breeding records, and the USDA NAHMS Goat 2019 report we checked doesn't publish one. So we won't invent one.

What should kidding season prep look like?

A due date on the calendar and a box of supplies 2 weeks ahead of it. Work backward from the date you set at breeding, and check often but don't interfere.

• 6 weeks out: start the slow grain increase. Confirm does are at 2.5 or better.

• 4 to 6 weeks out: the clostridial (CDT) booster, on your veterinarian's schedule.

• 3 to 4 weeks out: finish acclimating does to new feed. No deworming in the last 2 to 3 weeks.

• 2 weeks out: set up kidding pens, at least 1.5 square meters each per Merck. Stock 7 percent iodine, towels, a tube feeder, frozen colostrum.

Know the clock so you know when to call. Oklahoma State gives stage one at 4 to 8 hours for mature does, 6 to 12 for first-timers, and delivery under 1 hour. Their rule: never let a doe strain hard more than 30 minutes, and if repositioning or pulling fails for 30 minutes, call your vet.

Then colostrum, the whole ballgame. Oklahoma State says kids should take in 10 percent of their body weight in colostrum in the first 24 hours, ideally within the first hour, because absorption drops sharply after that day. Freeze the surplus in ice cube trays.

Frequently asked questions

How long are goats pregnant?

Goat gestation runs 146 to 155 days, about 150 on average, per Oklahoma State University Extension and the Merck Veterinary Manual. Count 150 days forward from the breeding date. A doe bred in mid October kids in mid March.

What month should you breed goats for spring kids?

September through January, because most goats are short-day breeders. Oklahoma State University Extension puts seasonal anestrus at February through July, so fall is when does settle most easily. Nigerian Dwarf goats are an exception and breed year round.

How old does a doe need to be before her first breeding?

Go by weight, not birthday. North Carolina State Extension says does should not be bred until they reach 60 to 75 percent of their expected mature weight, usually between 7 and 10 months old. Merck gives 60 to 65 percent.

How many does can one buck breed in a season?

Published figures run from 20 to 50 does per mature buck. North Carolina State Extension recommends 20 to 30, Oklahoma State University Extension says up to 50, and the Merck Veterinary Manual uses 1 to 40. Langston notes only 5 to 15 if does are synchronized.

What records does a goat breeding program need?

Animal ID, birth date, birth weight, sire, dam, number born, number of kiddings, number weaned, and total pounds weaned, the list eXtension's goat program publishes. At culling time, number weaned tells you more than number born.

The numbers, in one place

You never know, but you can always be ready.

Sources: Langston University goat reproductive biology, Langston University basic reproductive management, Langston University body condition scoring, Merck Veterinary Manual, breeding and parturition of goats, Merck Veterinary Manual, pregnancy toxemia, Merck Veterinary Manual, caprine arthritis and encephalitis, Merck Veterinary Manual, caseous lymphadenitis, Oklahoma State University Extension, bucks and breeding, Oklahoma State University Extension, kidding, NC State Extension, heat detection and breeding in meat goats, NC State Extension, sheep and goat breeding protocols, Penn State Extension, buck selection principles, eXtension goat selection and performance records, eXtension goat transition period, eXtension goat nutrition, selenium, eXtension goat nutrition, copper, eXtension Nigerian Dwarf breed page, American Consortium for Small Ruminant Parasite Control, drug resistance, American Consortium for Small Ruminant Parasite Control, FAMACHA.