Reproductive problems hit breeders where it hurts most, right in the breeding hen. There is nothing more frustrating than losing a good bird when it's breeding. The following article describes some of the more common problems and some things you can do to help.
· Egg Binding
· Prolapse of the Oviduct and Uterus
· Infections of the Oviduct and Uterus
· Oviduct Impaction
· Cloacal Problem
· Ectopic Eggs (Non-Septic Egg Peritonitis)
· Septic Egg Related Peritonitis
· Chronic Egg Laying
· Over Production
· Abnormal Eggs
· Keeping Hens in Good Condition for Breeding
The failure of an egg to pass through the oviduct at a normal rate.
Causes of egg binding include:-
· oviduct muscle dysfunction due to nutritional deficiencies, especially calcium, vtamin E and selenium
· malformed eggs
· excessive egg production which can exhaust the birds reserves of calcium, vitamins and energy
· previous reproductive tract damage or infection which may lead to scarring and adhesions to other organs
· obesity which is unfortunately a very common problem
· lack of exercise, which leads to poor muscle strength
· senility. Older birds are more likely to become egg bound
· other stress factors, including severe temperature changes, disease or overcrowding
Signs a bird can show include:-
· reluctance to fly or perch
· persistent tail wagging or straining
· a wide based stance ("penguin stance")
· a hard swollen abdomen
· and if severe a leg weakness or paralysis.
Many of the complications of egg binding can lead to the death of the bird.
Treatment involves first and foremost stabilising the patient. Make no attempts at delivering the egg until the bird is stable.
If only minimal depression is present then provide supplemental heat (28-31°C) with easy access to food and water. Cropping the bird with oral calcium, vitamin D and energy supplements can be useful. Lubricate the vent (KY jelly or Vaseline are useful). Wait at least 20 minutes for the bird to pass her egg on her own before intervening.
If the hen stays stable but does not pass the egg then a short attempt at gentle manipulation of the egg can be attempted. Don't press directly down onto the egg. This will push the hard shell against the fragile kidneys, adrenal glands and ovary, which can cause death or bruising of the kidneys resulting in a leg paralysis.
Pressure can be applied to each side of the egg downwards, towards the vent. If there is not immediate success, stop. Put the bird back into the heat and wait another 15 to 20 minutes.
This process can be repeated a number of times while the bird is not severely depressed. If still no success consider veterinary help, either by phone or preferably bring the bird to us before she is too unstable.
If the hen shows signs of severe depression then immediate veterinary treatment is recommended. We can provide the hen with antibiotics, intravenous fluids, hormones (oxytocin) which promote uterine contractions, steroids and injectable calcium and energy supplements. If necessary we can collapse the egg after draining its contents (ovocentesis) or open the uterus under a general anaesthetic and remove the egg.
Complications - these are the things that can go wrong when you finally get the egg out and think you're in the clear. Murphy's Law !!
· more eggs produced. - this can cause repeated egg binding (always more serious than the first)
· egg impaction
· peritonitis (infection in the abdominal cavity)
· oviduct and uterine infection
· ruptured oviduct, permanent damage to oviduct
· abdominal hernia which is a rupture of the abdominal muscles making egg laying almost impossible - can be surgically repaired with varying degrees of success
· prolapses of the oviduct and cloaca
· hypocalcaemia - drainage of the bird's calcium reserves can lead to a problem of muscle weakness and inability to fly or even stand. Oral calcium supplements over a week to ten days can pull many of these birds through
· paralysis and weakness can also be due to kidney damage or infection - the sciatic nerve in birds runs through the middle of the kidneys and any swelling here can cause weakness or paralysis
· secondary infection. The stressed bird's immune system is compromised and secondary bacterial infections or resurgent chlamydiosis can occur
· any, some or all of these can lead to DEATH.
PROLAPSE OF THE OVIDUCT AND UTERUS
An extrusion of the interior cloaca and uterus to the exterior and has the appearance of a red inflamed mass of soft tissue at the vent.
It can occur following normal egg laying but is especially common after an episode of egg binding. It is more likely to occur in birds that are in poor physical condition (eg muscle weakness, obesity or malnutrition). More likely with malformed, soft or shell-less eggs.
· keep exposed tissues moist and clean with copious amounts of saline solution or a very dilute iodine (Betadine / PVP-Iodine) or chlorhexidine solution (Aviclens or Hibiclens)
· if no egg is present and tissue is not badly damaged then gently replace the prolapsed tissue by pushing it back in place with a moistened swab or cotton bud
· can and often does recur, however if treated early have a good chance at complete repair
· attempt to switch off the birds breeding cycle (see under Chronic Egg Laying)
· veterinary assistance is recommended if; its a valuable bird, an egg is caught in prolapsed tissue, keeps on prolapsing or if there is significant tissue damage. There are surgeries which can assist even the most longstanding prolapses
· also seek help if the bird shows signs of moderate to severe depression. Uterine infections are common following prolapses
INFECTIONS OF THE OVIDUCT AND UTERUS
Can be associated with general systemic infections or can occur on their own. Infectious agents include bacteria, chlamydia, mycoplasmas and fungi.
Factors which make infections more likely include:
· egg impaction in the uterus
· egg related peritonitis
· excess abdominal fat
· more common in older hens
Signs of these infections are very general and non-specific. They include; depression, anorexia, weight loss and abdominal enlargement. Occasionally a cloacal discharge will seen (smelly ooze from the vent).
Birds can produce eggs through an infection but quite commonly these eggs will be misshapen with a rough sludgy appearance to the egg shell. Normally as the shell forms the egg is rolled smoothly in the shell gland. Where there is infection the motion will be jerky and the shell rough.
Dead in shell can be as a result of uterine infections in the hen, as can the weakness and deaths of chicks after hatching.
Treatment of uterine infections is based around antibiotics. Identifying the bacteria and the correct antibiotic by cultures is worthwhile in valuable birds.
In severe cases uterine flushing can be helpful and to salvage the bird, a hysterectomy can be performed. This puts an end to a bird's breeding career but can save its life.
· egg binding
· egg impaction
· uterine rupture
· septicaemia (systemic infection which can be rapidly fatal. In as little as 1-2 hours infection can spread to all body organs)
The binding up in the uterus of successive eggs, egg yolk material and where infection occurs also pus material.
This problem usually occurs secondary to egg binding or uterine infection.
· a stop in egg production
· progressive loss of condition
· alternations between diarrhoea and constipation
· abdominal enlargement
· a reluctance to fly or walk
Treatment is limited to surgery. Attempts can be made to salvage the uterus, but most cases have severe scarring and adhesions. The birds may be saved by a hysterectomy but have no breeding future.
Inflammation or infection of the ovary which is usually secondary to systemic disease.
Signs are difficult to distinguish from any other systemic disease including:-
· wasting and death (most cases are diagnosed by post mortem)
Treatment is the same for any severe systemic disease and involves supportive care with warmth, fluids and nutrition. Antibiotics are useful in cases of bacterial infection.
Any problem in the cloaca can cause obstructions to egg laying (eg. infections, scarring, faecal stones or chronic prolapses) or to mating (e.g. dense vent feathering, abdominal fat, papillomas or warts especially those due to vitamin A deficiency).
ECTOPIC EGGS (NON-SEPTIC EGG PERITONITIS)
Eggs not taken up by the oviduct and instead are deposited into the abdomen. Can also be caused by rupture of the oviduct and is more likely to occur if hens are restrained or stressed during ovulation.
Results in yolk material spreading through the air sacs and over the abdominal organs which causes a mild inflammatory reaction. If no bacteria is present, all yolk material will be reabsorbed.
· abdominal swelling
· wide based stance
· weight loss
Treatment is mainly supportive, but antibiotics are used in case of septic peritonitis.
If the signs are severe then surgery to remove yolk material.
Attempt to switch off laying cycle. Manipulating the amount of light the bird gets can be successful. We recommend the hen be removed from its cage and sight and sound of its mate, then covered except for four hours of light for four days. If this is not successful hormonal injections can be used but there is a risk of significant side effects including depression, increased urine production, weight gain, liver damage, suppression of the immune system and diabetes.
SEPTIC EGG RELATED PERITONITIS
Yolk peritonitis that is contaminated with bacteria and causes a severe inflammatory reaction throughout the abdomen. It is more common than non-septic peritonitis.
Causes congestion, scarring and adhesions of all abdominal organs.
· can simply be sudden death
· see abdominal swelling
· respiratory distress
· cessation of egg laying
Can be complicated by diabetes, strokes, intestinal obstruction and hepatitis.
Treatment initially involves supportive care to stabilise the bird. Heat, fluids and antibiotics should be given as well as the provision of high protein foods.
Surgery is helpful in valuable birds to remove pus and infected yolk material. In pet birds we generally perform a hysterectomy at the same time which prevents the disease recurring.
Any episode of this puts the birds breeding future in doubt as there is always scarring and adhesions and there can be severe uterine damage.
CHRONIC EGG LAYING
Laying beyond the normal clutch size or repeated clutches in the absence of a mate or breeding season.
Especially common in hand raised hens which have imprinted onto humans.
Signs other than the number of eggs are limited to loss of condition.
Eventually malnutrition from pouring all her resources into egg production will result in abnormal eggs or egg binding due to uterine muscle dysfunction and general muscle weakness.
Treatment revolves around trying to switch off the laying cycle. Involves:-
· light manipulation (see under Ectopic Eggs)
· removing any objects the bird considers as potential mates
· removing nest boxes and nesting materials
· and change of cage
· If the bird is sexually oriented to humans then decreasing the amount of time spent with the bird can be helpful
In some particularly determined hens all this will fail and it may be necessary to use hormonal injections. (See under Ectopic Eggs for side effects that can occur with hormonal injections.) Injections will work for a period that can vary from as little as two weeks to up to six months.
In some hens the only solution is hysterectomy.
The maximum safe levels for production have not been determined in parrots. In the wild greater than two clutches per year is abnormal but this is quite often limited by feed availability. Can breed some parrots in captivity (eg Macaws, Cockatoos, and Eclectus) up to four clutches a year with no apparent side effects.
Prolonged laying, hatching and rearing puts stresses on a bird. If birds are kept in optimal conditions they seem to be able to keep on breeding. These birds are however on a knife edge. If anything is wrong with management or diet then the birds will not be able to cope. Diseases which are usually secondary problems can become major concerns, eg Chlamydia and Megabacteria (Otherwise known as Birdkeeper’s Bogeymen).
While no absolute recommendations can be made, it is best for the bird owners not to become greedy and push them for large numbers of clutches. Allow the birds a rest period each year.
An odd abnormal egg is not a concern and it is quite common for hens to throw different shaped eggs with no problems.
However a run of soft-shelled, rough shelled or infertile eggs indicates a potential problem.
· dietary insufficiency (esp. vitamins A, D3 & calcium)
· uterine infections - suspect if eggs are rough shelled or sludgy in appearance
· organochlorines (DDT) produce thin-shelled, fragile eggs - this is a continuing problem with birds of prey in the wild but be careful what you use around your birds
· ovary disease - will produce yolkless, small yolked or infertile eggs
· environmental toxins. There are many toxins that can affect the hen resulting in lowered egg production, early embryo death or weak chicks. Some common examples include: crude oil, exhaust fumes, NICOTINE, organochlorines and antibiotics containing furazolidone
KEEPING HENS IN GOOD CONDITION FOR BREEDING
1. ENSURE THE DIET IS ADEQUATE OR EXCELLENT (refer to Dr. Adrian Gallagher's excellent and award winning notes on avian nutrition.)
2. KEEP BIRDS LEAN. (This doesn't mean malnourished !!) Obesity is a common predisposing cause to many of these reproductive problems. Don't feed protein supplements in the off season. Allow the birds access to flight cages in off season.
3. FLUSHING increase protein levels as breeding season commences. This simulates flush of feed in wild which is usually tied in to breeding season. Can improve fertility of male and female, increase sexual activity and ovulation rates.
4. MINIMAL HANDLING BUT CLOSE ATTENTION for early detection of problems.
Hi there, I have a pair of kakarikis who are having trouble reproducing healthy, fertile eggs. Their first batch about a year ago, they layed 8 eggs of which 4 hatched and we were so overwhelmed and happy as we had never had birds before and we were now breeders. Once the chicks developed their full colored feathers, we started taking them out once a day to get them to be use to humans. Then when they started feldging it seemed like the parents started to ignore them and refused to feed them. They slowly started eating on their own but I think it was too slow as our first chick to fledge started breathing funny one night and when we came to check on her a half an hour later we found her dead at the bottom of the cage. i cried my heart out as if I'd lost a child. Then 5 days later we opened the cage and one of the chicks tried to fly and fell and broke his leg. The next day I rushed home from work to take him to the vet hospital to find the thrid chick to be totally paralyzed laying at the bottom of the cage. I could not believe what I was seeing. It was a nightmare! I rushed both of them to the vet hospital but they did not specialise in birds and gave them something for the pain and said they can't help me. I then went home and held the paralysed one in bed in a blanket with me as I could see he was dying. He died in my arms that night Then i went on a mission to find a avarian vet in an attempt to save my second chick who had a broken leg, they tried to operate on him but he died during before they could operate as he was too weak already and the anaethetic killed him. While all of this had happened in the span of one week, we still had a little girl to be fledged in the breeding box. You can imagine how worried i was that she would too eventually die after fledging. So once she fledged, we took her out of her parents cage and tried our best to get her to eat by herself as it seemed that the others refused to eat and would rather run after their father to feed them and he would just ignore them. To our amazement she survived and we told her to a loving home as she needed a bigger cage.
Since then our hen has been laying infertile eggs for almost a year. She lays 8eggs, they never hatch, then she starts burying them and we throw them out. I don't know what to do. We can't stop them from mating and laying eggs as they get depressed if they are separated. But I'm worried about our hen, is it healthy for her to keep laying eggs that never hatch?
Several things/factors come to mind
1/This is their 1st batch(?) Dont mess with them, let nature do its thing
2/Diet..If they have good diet 3 at least months before laying. during incubation..recovery, and for feeding the young chicks, good nuttition is essentual to healty devalopement and stong bone structures to devalope by fledging.....A 80% healthy adults to egg ratio is expected.
3/ Continuing infertility...
It is very common for breeders to be given so called healthy pairs (all species of birds) because they are so called "infertile" ..put them onb a quick 'booster ' diet for a week, the back to a consistant balaced diet...suddenly start hatching eggs again, and turn into productive birds.
Experiments her over 4 yrs (so far) of 3 pair so they will breed and raise approx 80% healthy adults, non stop all yr rourd upto around 120 healthy adults in a natural balanced , consistant diet, AFter about 120 fertility rates droped in all 3 pair dramatically down to 2 to 4 chicks per batch.
After 135/140 2 to 3 chicks.
Over this time we had 3 chicks that fledged and where 'defective' this included, falling hard out of the nest, breaking a wing in on case, a leg in the other, and the 3rd had internal issues....less than a 1% rate...in nature it happens and as breeders we must accept all aspects of nature
The parents..espec the hens are still in "pristine condition" which suprised the President of the NZ Parrot Society the other day.
Another issue can arise with females, there seems no real explanation, they go to nest lay eggs but never allow the male to mate or mate properly...Some just go to nest live there not even lay eggs or just the occassional egg. These hens tend to behave as if they have been intimidated in some way..be it interferiance, an overly agressive male, intimidation in a flock...I dont know...but one or several of these seems to be a common factor. _________________ My Spelling is Not Incorrect...It's 'Creative'
Hi Steptoe, Thank u for the quick reply. I've been watching your advise to others for tha past year and finally managed to register.
1. Yes, it was their first batch that hatched and had such a tragic ending with 3 of the 4 chicks. At the time our hen was still a baby herself. We had just bought her and within a month she started mating with our male whom we found in our garden one day and decided to give him a home as he looked way too pretty to be living in the wild and surviving. So we thought someone must've lost him and we took him in. So I'm not sure how old he actually is. It was amazing when we bought a hen at the pet shop & they liked each other and became a pair.
2. Diet I think is good now. At first batch we were only feeding them seeds and mainly sunflower seeds which I now know is bad for them. Now we buy them pellets, some corn & seed mix that we cook which they love, and they eat their veggies they love carrots, apples, spinach, split peas, and sometimes brocolli. They very fussy and don't eat certain veg & fruit so these above seem to be their favorites.
3. They are still mating as we speak even though I took their nest box out because their last batch a week ago did not hatch & expired. Could it be that they not mating properly? That is why eggs never hatch? Or do they need to mate in order for the eggs to hatch.
P.S. The pic on my profile is of two of my angels (chicks from first batch) that passed away.
yes but from your description/background , unlikely.
I come back to diet and length of time of good diet...around 6 months of good diet...and maybe a little too much interferance.
You do nt meantion protien...definately need heaps of protien, a huge part of their natural diet. _________________ My Spelling is Not Incorrect...It's 'Creative'
Oh ok, so I just need to add more protein & not interfere with their nest box. We were told by a bird expert that the hen cannot handle laying on 8eggs and we should therefore remove half of the infertile eggs to make it easier for her. Should we just leave her and only remove the eggs they've been in nest box for a month and hen starts ignoring them?
We were told by a bird expert that the hen cannot handle laying on 8eggs and we should therefore remove half of the infertile eggs to make it easier for her.
Bottom line..get a new 'expert'
When the hen finds the eggs are infertile she will move to the next nexting box over the next days/weeks.
When it is obvious she has abandoned them, clean the nesting box out and re pack it. _________________ My Spelling is Not Incorrect...It's 'Creative'
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You cannot attach files in this forum You can download files in this forum