
Captivity challenges: Study finds ailments in zoo animals
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Kolkata: Disease diagnosis of animals at Alipore Zoological Garden, one of the oldest in the country, has unearthed frequent cases of lameness, hepato-renal abnormalities (liver and kidney diseases), and respiratory complications.
According to experts, this points to challenges of life in captivity due to a lack of natural food or prey, movement space, and natural habitat.
The findings of the study, conducted since 2022 by the zoo veterinary hospital's research wing, were published in the latest (2023-24) annual report of the zoo. The findings were arrived at following the use of modern diagnostic imaging techniques and X-ray on herbivores, tigers, leopards, primates, birds, snakes, and tortoises, ultrasonography on leopards, tigers, jungle cats, primates, snakes, and tortoises, and rigid endoscopy on birds and snakes.
"They found cases of lameness, i.e., animals becoming inefficient in walking and weight-bearing, for which irregular movements and less use of limbs are suspected to be the most influential variables in these captive animals," a zoo official quoted the report.
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A vet associated with the state's animal resources development department said more than the lack of space, it is the food habit or lack of natural prey that is responsible for lameness among animals.
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"The meat of slaughtered animals, no matter how fresh, cannot replace the natural prey of a tiger. In the long run, animals suffer from a lack of minerals and calcium, often leading to degenerative changes in their joints with reduced joint space," he said, adding that the use of vitamin supplements is a must in such cases.
Former Alipore zoo vet, D N Banerjee, said, "Apart from space constraints, nutritional issues, too, are responsible for this."
A zoo official said in case of bone diseases, they give animals medicines, change their diet, and alter environmental enrichment in enclosures.
The research team also found profuse respiratory complications, like pneumonia, cough with a wheezing sound, and occasional open-mouth respiration, in snakes, birds, and mammals. According to the ARD department vet, this is often found in tortoises. "Their enclosures should not be hot and humid.
There should be a balance between light and shade. There should also be natural water sources. This may not always be possible to ensure due to lack of space," he said.
The USG diagnosed animals with uterine problems and liver-kidney abnormalities. "Abnormalities in the food habit can also be a trigger," said a vet, adding: "In captivity, birds that prefer fish are often fed fish procured from suppliers. That contains some enzymes that thwart the absorption of vitamins and minerals during digestion."
The vet team also examined samples of raw buffalo meat, which is less fatty and contains fewer bones, and is the prime food source for large carnivores at the zoo. "Due to its high nutrient content, it is considered an excellent medium for growth of pathogenic organisms. We tested 37 raw buffalo meat samples and except one, all were positive for E. coli. We also found staphylococcus bacteria, mostly in summer, and various yeasts and molds throughout the year.
However, despite bacterial and fungal loads, none seemed to cross the threshold value and no pathogen-borne disease has yet been recorded at the zoo," said the official.

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