HYPOCALCEMIA IN LATE-GESTATION (and lactating) DOES:
Feeding to Prevent it
By Sue Reith (2/07 update)
Hypocalcemia is a life-threatening condition that shows up when a doe is either pregnant or lactating, but getting fed an unbalanced diet that doesn’t provide her with enough calcium for both herself and her growing fetuses or for milk production. It can appear at any time during the last 2 months of pregnancy, right up to the doe's due date, as well as at any time while she’s lactating.
Symptoms: The first thing she'll do is refuse to eat her grain. Soon after that she won’t want her hay either. Without quick intervention she’ll become weak and wobbly, lethargic and depressed. If still untreated by then, she’ll lie down and not want to get up. If you take her temperature when you first see these changes, it’ll be normal (102.3), but soon after that it’ll drop to sub-normal (below 102). Unless corrective measures are begun right away you’ll lose both the doe and her fetuses.
Treatment: If, because you're unsure as to why the doe is behaving this way, you call a veterinarian in for advice, he or she will probably (and unfortunately) tell you that her problem is “pregnancy toxemia”, or “pregnancy disease”, or perhaps the most likely diagnosis will be “ketosis” a secondary condition that happens when the doe stops eating (in this case because she's too weak to do so) thus has to start living on her own body's reserves*. While ketosis was not the initial cause of the doe's difficulty, after a couple of days of being too weak to eat any food it will certainly become a major part of her problem! So it, too, must be dealt with fast! A veterinarian, recognizing the ketosis but not the hypocalcemia that caused it, will want to treat with glucose, etc. But it's absolutely essential that the doe be treated with calcium supplements** at the same time, without which she will either end up dead, babies and all, or with a c-section, with babies too young to survive, and a hefty vet bill as well. So it behooves the owner to take charge of this whole process right away, to treat the doe with calcium supplements for the hypocalcemia, and, if more than a day or two has passed before treatment was begun, with glucose for ketosis as well.
Cause: It's all about the food! Most cases are seen in does that are getting a hefty grain ration along with their hay, especially when they're getting grass hay instead of alfalfa. During the last 2 months of the doe's pregnancy, this type of grain/grass hay diet does not provide enough Calcium for both the fast-growing fetuses' bone development and for her own muscle tone as well, so depending on how many fetuses are draining calcium from her to build their little skeletons, at some point the babies will drain ALL of her calcium from her for their own needs, leaving her nothing to keep her heart going (the heart is a muscle) or to go into labor (the uterus is ALSO a muscle). And the more fetuses she's carrying, the sooner this will happen! With just 1 or 2 fetuses she may make it until she goes into labor, but then be too weak from lack of muscle tone to expel the babies in a timely manner***. Or if she does succeed in birthing the kids (often requiring the owner's assistance), starting lactation in a calcium-deficient state can lead to a sudden (and very surprising!) loss of milk production at some unexpected point during lactation.
Prevention: You CAN prevent this, just by feeding your pregnant does a proper diet during pregnancy! Pregnant does need a great deal of calcium in their diets, particularly in the last two months of gestation. That's when the fetuses, now having fully developed all their little parts, focus all their energy on growing rapidly, and in so doing drain large amounts of calcium from the mother's body. Calcium is only available in the diet if the doe is ingesting at least 2 parts (and no more than 5 parts) of calcium-providing food to every 1 part of phosphorus-providing food. “The calcium-to-phosphorus ratio of a food or supplement determines how much of the calcium is absorbed.” (http://www.askdrsears.com/html/4/T040600.asp, bottom of the article, #8 under “12 ways to boost your calcium”.)
The only really good Calcium-providing feeds are alfalfa and clover, because grass hay contains barely any at all. OTOH, ALL forms of grain contain a great deal of phosphorus (and almost no calcium whatsoever). So if you feed grain without the calcium available from alfalfa or clover, OR if you feed alfalfa or clover without the phosphorus available from grain, there will be NO calcium available in the diet you feed for the developing babies....
During the doe's pregnancy, there are three basic feeding approaches that will prevent hypocalcemia.
(1) Provide her daily with a small amount of grain (for a mature dairy-sized doe that would be no more than one cup per feeding) along with a regular ration of alfalfa, or,
(2) If feeding a grass hay or pasture instead of alfalfa, give her NO grain at all. That's because while grass hay does in itself contain a proper ratio of calcium to phosphorus, the total amount of each is exceedingly low. But adding a heavy-phosphorus grain ration to it would turn the balance of calcium to phosphorus upside down to something like 1 Ca to 4 (or more) P, making NO calcium available to the doe, and setting her up for hypocalcemia in late gestation. To increase the availability of Calcium in this instance, provide a good free-choice loose supplemental trace mineral mixture that contains at least 16% protein (grass hay has only ~5%), along with a ratio of no lower than 2 parts of Calcium to each 1 part of Phosphorus (the amount of which could be nicely increased with the addition of powdered Di-Calcium Phosphate, available through feed suppliers as well as online.)
(3) For those who would prefer to feed both grain and hay in late gestation, but because they don't have ready access to free choice alfalfa must instead either pasture their goats or feed them grass hay, if alfalfa pellets can be bought locally at a reasonable price, a perfect late gestation diet for prevention of Hypocalcemia would be a ration of 1 cup (by measure) of grain, added to (using the same cup) 3 cups of alfalfa pellets, fed 2X daily, along with all the free choice pasture or grass hay the does want to eat between meals, and free choice access to a good, loose, trace mineral supplement, and baking soda.
In an effort to help owners figure out just how much of what feed to give their late gestation does to provide that minimum 2:1 ratio, I recently wrote a technical nutritional analysis of how the 2 CA to 1 P balance works out in real-time farm-feeding measurements. (I'll be happy to forward a copy of that analysis to readers who'd like to read it.)
And then to translate the technical information in the article into useful terms, I calculated the actual weight of the (minimum) 2Ca:1P ratio diet I feed to my own Togg does. In so doing I found that at mealtime they each get 1 lb of alfalfa (a combination of 12 oz alfalfa pellets, ALL of which is devoured eagerly, and roughly 24 oz loose alfalfa free choice, some of which is generally wasted) along with 1 cup (1/4 lb by weight) of grain. That's roughly a per-meal ratio of 1 lb of calcium-containing food to each 1/4 lb of phosphorus containing food, translating to a daily ration of 4:1 (4 Ca to every 1 P), well-within the parameters of the acceptable calcium to phosphorus ratios of 2Ca:1P to 5Ca:1P that are needed to make calcium available in the diet.
Because when measuring them pound for pound we can see there's a difference in the volume of grain and alfalfa pellets, after calculating the above feeding ratio by weight I went back again and re-calculated it by volume. When I filled up my 1-cup grain-measuring container with alfalfa pellets instead, I discovered that it took exactly 3 of them to fill up my larger, alfalfa-measuring container. So, when measuring out a feeding of grain and alfalfa pellets for one animal, to provide the essential minimum of 2 Ca to 1 P ratio in that meal all you need to do is put 3 of the small scoops (or a larger scoop that holds the equivalent) of alfalfa pellets into the dish, and top it off with 1 small scoop of grain****!
Addendum: For readers that while feeding to prevent Hypocalcemia are concerned about other nutrients, such as protein, being available to their does as well, according to Ensminger and Olentine's Livestock Feeds and Nutrition Complete the average digestible protein content in grain is 11.2%, whereas in alfalfa it's 15.9%, in clover 10.5%, in beet pulp it's 14.1% and in grass hay 5.1%. The average digestible energy level in grain is 1.38%, in alfalfa it's 1.13%, in clover it's 0.93%, in beet pulp it's 1.32%, and in grass hay it's 1.8%. And, last but not least, the average crude fiber content in grain is 6%, in alfalfa it's 27.2%, in clover it's 25.7%, in beet pulp it's 15.17%, and in grass hay it's 28.2%.
Bainbridge Island WA
*When the goat doesn't get food from outside, it tries to stay alive by using its own reserves. Its own fatty tissue is used to provide energy, and in so doing it releases 'ketones' into the system. The ketones soon shut down the liver, hence the name 'ketosis'.
**The most effective calcium supplementation is done with CMPK, because it's made up of not just Calcium, but also Magnesium, Phosphorus, and Potassium, formulated to work together as a team to make Calcium more quickly available to the body, and at the same time prevent an overdose of the Calcium (which when given alone can result in cardiac arrest) during restoration. For those that have no access to CMPK, A 'homemade recipe' for it follows:
To re-create the equivalent of a 30 cc CMPK dose (650 mg calcium; 500mg potassium; 150 mg phosphorus; and 96 mg magnesium) right in your kitchen, go to the Supplements department of any large chain-type drugstore and buy a bottle of Posture-D tablets (containing 600mg calcium, 266mg phosphorus, and 50mg magnesium), and bottles of Potassium tablets (500 or 550mg) and Magnesium tablets (150 or 250mg). Calculate the amount of each pill needed to come up with an equivalent to one 30cc dose of CMPK as spelled out above, and, using a pill cutter of some kind, create that amount, crush it up to a powder and serve it orally in a little yogurt. Or add some water to the mixture and dose it in a drenching syringe.
***This delayed labor brought about by a lack of sufficient calcium to provide the uterus with proper muscle tone is also the cause of Floppy Kid Syndrome! The babies remain in the birth canal for too long before gaining access to oxygen, a process which sets up an acidosis in the brain tissue. This is why Sodium Bicarbonate is the treatment of choice to save the 'Floppy Kid”, which it does by neutralizing the acidosis in the kid's brain.
****If the pregnant doe is lactating and still being milked, you can serve that grain/pellets combo to her while in the stanchion