Jake Harper
The caeca (plural form of cecum) are two blind pouches located where the small and large intestines of a chicken join. The function of the caeca in the maintenance of gut health, fermentation of undigested nutrients, recycling of nitrogen from urine, and modulation of gut microflora is not well understood. However, it is known that the caeca play a role in the transport of water, sodium, potassium, and chloride, with the dominant effect being that of sodium transport.
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What You'll Learn
The role of the caeca in gut health
The caeca (plural form of cecum) are two blind pouches located where the small and large intestines join. They play a significant role in maintaining gut health in chickens, which is crucial in poultry production.
One of the essential functions of the caeca is the fermentation of undigested nutrients. During this process, the caeca produce several fatty acids and eight B vitamins, including thiamine, riboflavin, niacin, pantothenic acid, pyridoxine, biotin, folic acid, and vitamin B12. The fermentation process involves the conversion of uric acid and carbohydrates into ammonia and volatile fatty acids by abundant microflora in the caeca.
The caeca also contribute to the re-cycling of nitrogen from urine. This process helps in the modulation of gut microflora, maintaining a healthy balance of microorganisms in the digestive system. Intestinal diseases in chickens often occur when there is an imbalance in the normal microflora, leading to inflammation of the intestines, known as enteritis, or severe damage to the intestinal tract, called necrotic enteritis.
Additionally, the caeca play a role in the transport of water, sodium, potassium, and chloride, with sodium transport being the dominant effect. They also help determine the ionic composition of the voided excreta. The size and weight of the caeca can vary depending on the diet of the chicken, indicating that dietary changes can influence the structure and function of the caeca.
While the exact significance of these processes in modern high-yielding poultry remains to be fully understood, it is clear that the caeca play a crucial role in maintaining gut health and nutrient absorption in chickens.
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Re-absorption of salts and water
The caeca in chickens are two blind pouches located at the junction of the ileum and rectum, where the small and large intestines join. They play an important role in the re-absorption of salts and water, which is an essential part of the digestive process.
The re-absorption of salts and water in the caeca is a result of anatomical and physiological adaptations. Only small and/or soluble particles, along with urine and digestive fluids, are refluxed into the caeca. This allows for the re-absorption of salts and water, which is crucial for maintaining the proper ionic composition of the chicken's excreta. The dominant effect is that of sodium transport, which is particularly important for marine birds that drink seawater. By secreting a sodium chloride (NaCl) solution more concentrated than seawater, these birds can generate osmotically free water that sustains their physiological processes.
The re-absorption of water in the caeca also helps to prevent dehydration and maintain the chicken's water balance. The size and development of the caeca can impact the amount of water reabsorbed, as larger and more developed caeca have been associated with lower water excretion relative to feed intake. This indicates that well-developed caeca contribute to efficient water reabsorption.
In addition to water, the caeca also play a role in the transport and re-absorption of specific salts. This includes the transport of sodium, potassium, and chloride ions. By regulating the ionic composition of the excreta, the caeca help maintain the overall health and balance of the chicken's digestive system.
While the re-absorption of salts and water in the caeca is important, it is not yet fully understood how significant these processes are for modern high-yielding poultry. Further research is needed to determine the quantitative impact of these functions on the nutritional status and performance of domesticated poultry.
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Fermentation of undigested nutrients
The caeca are two blind pouches located where the small and large intestines join. They play a role in the transport of water, sodium, potassium, and chloride, with the dominant effect being that of sodium transport.
The role of the avian caeca in the fermentation of undigested nutrients is not well understood. However, it is believed that due to anatomical and physiological adaptations, only small and/or soluble particles will be refluxed into the caeca along with urine and digestive fluids. Here, salts and water are reabsorbed, and uric acid and carbohydrates are fermented by the microorganisms present to ammonia and volatile fatty acids.
The caeca may play a role in the nutritional status of the bird, although the quantitative significance for high-yielding domesticated poultry remains to be determined. During fermentation, the caeca produce several fatty acids as well as eight B vitamins: thiamine, riboflavin, niacin, pantothenic acid, pyridoxine, biotin, folic acid, and vitamin B12.
The process of fermentation in the caeca may also be indicated by a decreased pH, which could be a result of microbial fermentation of unabsorbed NSP residues and nitrogenous compounds.
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Nitrogen recycling from urine
The avian caeca play a role in the maintenance of gut health, the fermentation of undigested nutrients, the recycling of nitrogen from urine, and the modulation of gut microflora. The recycling of nitrogen from urine in the caeca is particularly significant in protein-depleted chickens.
In chickens, the caeca are involved in the conservation of urinary nitrogen, which is especially important when the bird is fed a low-protein diet. The caeca aid in the production of ammonia from uric acid, urea, and amino acids, which can then be absorbed. This process is detailed in a study by Karasawa Y. and Maeda M. (1989) on the effect of colostomy on nitrogen nutrition in chickens fed a low-protein diet plus urea.
The role of the avian caeca in nitrogen recycling from urine is not yet fully understood, but it is believed that only small and/or soluble particles, along with urine and digestive fluids, are refluxed into the caeca. Here, water and salts are reabsorbed, and uric acid and carbohydrates are fermented by the abundant microflora to produce ammonia and volatile fatty acids.
The ammonia produced in the caeca may be absorbed back into the bird's system, as evidenced by studies showing that acidified urine contains more ammonia than untreated urine. This suggests that the caeca play a role in the nitrogen metabolism and nutritional status of the bird, although further research is needed to fully understand the quantitative significance, especially in high-yielding domesticated poultry.
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The effect of dietary changes on the caeca
The caeca in chickens play an important role in gut health, fermentation of undigested nutrients, recycling nitrogen from urine, and regulating gut microflora. The function and nutritional role of the caeca are not yet fully understood, but dietary changes can significantly impact their structure and performance.
Dietary strategies and nutritional interventions can influence the caeca's microbial ecology and the overall health of the chicken. For instance, a study by Kiarie et al. (2014) found that maize-based diets resulted in higher gene abundance for biosynthesis of secondary metabolites and carbohydrate metabolites. This is due to maize having higher starch concentrations and lower water-soluble NSP (non-starch polysaccharides) than wheat. Wheat-based diets, on the other hand, require more intense interactions to degrade complex substrates, and they promote a different bacterial population.
The type of cereal in the diet, as well as the levels of crude protein (CP) and sodium butyrate, have been shown to significantly impact the caecal microbial communities in chickens. A diet of wheat promoted the presence of Lactobacillaceae, Bifidobacteriaceae, and Bacteroides xylanisolvens, which can break down complex carbohydrates. Maize and wheat cereals, in combination with varying levels of CP and sodium butyrate, resulted in changes to the overall structure of bacterial communities in the caeca.
Additionally, the weight and length of the caeca in broiler chickens were found to change significantly just two weeks after dietary alterations. A low-protein diet with essential amino acid supplementation resulted in increased body weight in chickens. Dietary supplementation with algae extracts also influenced the growth performance and caecal microbiota of broiler chickens.
The intestinal microbiome is crucial for the efficiency and health of the chicken's digestive system. Indigestible NSPs, through bacterial fermentation, produce short-chain fatty acids like butyrate, which are essential for host metabolism and gut health. Crude protein is also essential, as it provides the amino acids that are absorbed and transformed into body proteins.
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Frequently asked questions
The caeca are two blind pouches located where the small and large intestines join. They play a role in the transport of water, sodium, potassium, and chloride, with the dominant effect being that of sodium transport. They also help determine the ionic composition of the voided excreta.
The role of the avian caeca in the maintenance of gut health is not well understood. However, it is believed that they play a role in the fermentation of undigested nutrients, the recycling of nitrogen from urine, and the modulation of gut microflora.
The caeca are highly adaptive and will change in size according to the nature of the diet. For example, Jozefiak et al. found that the number of coliforms and lactic acid bacteria was higher on a rye diet than on a barley diet.
