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1. why is chickens and turkeys leg is small
2. why ostridge has big legs
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Answer:
1.) Leg problems can occur in fast-growing strains of broilers and turkeys. These disorders are not unique to small flocks; they also occur in commercial broiler and turkey flocks. Estimates of the incidence of leg and foot problems range from 0.5 to 4 percent of all broilers grown.
What is a leg problem?
Some birds may develop crooked legs, toes and feet; bowlegs; twisted joints; or swollen hock joints between the drumstick and the foot. Most are not severely affected and will grow quite normally. Others are more severely affected and may not be able to stand, or their feet may deviate drastically from their normal position. Birds with leg problems so severe and painful that they are unable to obtain food should be terminated.
Wide fluctuations in occurrence and multiple pathological conditions indicate that leg disorders are caused by many factors. Selection for rapid growth may add to this problem because of the increased stress on the skeletal, muscular, and tendon tissues of the birds.
What causes leg problems?
An average weight gain of 4.25 pounds in seven weeks, a high ratio of white to dark muscle, stress, and improper management may lead to leg problems. The largest, fastest growing males in the flock are usually the ones affected. Although a small percentage of birds may be predisposed to leg problems, use of highly selected fast-growing strains is recommended because savings in feed costs and time far outweigh the loss of a few birds.
If hatching your own chicks, be sure they have a firm surface to stand on while inside the incubator. It takes a few hours after hatching for their leg muscles to function fully. Slippery surfaces also may lead to leg problems.
Many leg disorders of Kansas broilers appear to be the result of nutritional deficiencies. Broilers need a well-fortified starter ration that contains 22 to 24 percent protein. Certain adjustments may be necessary if a lower protein, such as 20 percent starter ration, is all that is available. Equal parts of a 20 percent protein chick starter and 28 percent protein gamebird starter will provide a 24 percent protein ration.
If this option is not available, protein supplements such as meat meal or fish meal can be used to fortify low-protein starter rations. Have the local K-State Research and Extension agricultural agent help you formulate this mixture.
Other nutrition-related causes of leg disorders include switching from starter ration to grower ration too soon, or diluting the starter ration with cereal grains. Never dilute a complete ration with cereal grains unless specified on the product label. Either practice results in dilution of the nutrients in the rations, which can result in leg disorders from nutritional deficiencies.
Fast- vs. slow-growing
Recently, a lot of interest has developed for breeding slower-growing strains of meat-type birds. Research indicates that slower-growing birds often have fewer leg problems. For some producers the problem with slower growing birds is that they take longer to reach body weight. A fast-growing strain of bird should be ready for processing in 6 to 8 weeks compared to the slower strains, which will need 12 to 15 weeks. Birds that take longer to grow have a greater chance of dying from other causes and require more time and labor.
Most treatments are not likely to correct the problem. An exception is the use of a water-soluble vitamin mixture in the drinking water and the addition of a trace mineral mix to the feed. This treatment may be beneficial if administered at the first signs of trouble. A positive response indicates a higher fortified ration is in order. A complete ration from a commercial manufacturer does not require vitamin or mineral supplements.
Minimize the potential for leg disorders by following good management and sanitation practices, using quality rations, and minimizing stress.
One alternative to consider is using fast-growing strains, and growing them slowly. This can be done by feeding less concentrated rations or by limiting feed intake. Many fast-growing strains are grown in 24 hours of light. Turning the lights off for a few hours each night will limit feed intake. Be sure to ask your hatchery exactly what breed they are producing and choose proper management strategies.
If steps have been taken to reduce the occurrence of leg problems, don’t panic if a few birds in the flock are affected. Many of these birds will continue to grow and can be processed.
If the problem persists, a laboratory diagnosis of the condition is needed because of the difficulty in distinguishing between infectious and nutritional causes in the field.
2.) Their legs are perfectly placed so that the body's center of gravity balances on top of its legs. Their thin legs give them great speed and maneuverability, too. They can run up to 40 mph (64.3 km/h) for sustained periods of time, according to the American Ostrich Association
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