The Growth Depressing and Toxic Effects of Tannins to Chicks

Vohra, Pran; Kratzer, F. H.; Joslyn, M. A.

doi:10.3382/ps.0450135

Cited by 131 publications

(56 citation statements)

References 13 publications

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“…Levels up to 20% alfalfa meal in broiler rations resulted in growth rate depression due to the saponin content [81]. Further, tannic acid was also found to reduce the metabolizable energy of the broilers diet, depressing the nitrogen retention by chicks [82]. Finally, in a series of studies with geese, turkeys, quails and chickens fed with high-saponin and low-saponin alfalfa meal, at levels ranging 1-20% of diet, it was found that the only discrimination between the two alfalfa types was observed in geese fed 20% alfalfa [23].…”

Section: Influence Of Feeding Forage On Poultry Egg and Meat Qualitymentioning

confidence: 93%

Feeding Forage in Poultry: A Promising Alternative for the Future of Production Systems

2018

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Abstract:The present review discusses the existing research findings on the nutritional impact of forages in poultry diet and the significance of forages in sustainable poultry production systems. The nutritional composition and antinutritional factors of the main forages and the pros and cons of feeding forage on poultry meat and egg quality under free-range and organic production systems are also discussed. This review highlights the importance of forages and forage meals in poultry ration, considering that these feedstuffs may have greater value to the success of local poultry production in many regions of the world due to their potential of production.

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Section: Influence Of Feeding Forage On Poultry Egg and Meat Qualitymentioning

confidence: 93%

Feeding Forage in Poultry: A Promising Alternative for the Future of Production Systems

2018

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“…The effect was thought to be due partly to combination of tanning materials with protein in the gastro-intestinal tract, resulting in lower nitrogen assimilation. Tannins are toxic to chicks and depress growth by lowering the rate of food intake and also by reducing the uptake of nitrogen from ingested food (Vohra, Kratzer, and Joslyn 1966). Growth depression in rats, due to ingestion of tannic acid, was found to be due partly to decrease in food consumption.…”

Section: Defensive Function Of Tannins In Plantsmentioning

confidence: 99%

Seasonal Changes in Oak Leaf Tannins and Nutrients as a Cause of Spring Feeding by Winter Moth Caterpillars

Feeny

1970

Ecology

1,761

1,268

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Abstract. Concentration in the spring of feeding by caterpillars of the winter moth, Operophtera brumata L., and other species of Lepidoptera on oak trees in England is believed to be related to seasonal changes in the texture and chemical composition of the leaves. Increasing leaf toughness is a proximate, though probably not ultimate, factor preventing late larval feeding by the winter moth, the commonest spring species on oak. Early feeding coincides with maximum leaf protein content and minimum leaf sugar content, which suggests that availability of nitrogen, rather ·than of carbohydrate, may be a limiting factor for spring-feeding larvae. The content of oak leaf tannins, which inhibit the growth of winter moth larvae, increases during the summer and may render leaves less suitable for' insect growth by further reducing the availability of nitrogen and perhaps also by influencing leaf palatability. Oak trees are extensively damaged by insect attack, and it is likely that leaf tannins have a defensive function against insects as well as against other herbivores and against pathogens.

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“…Hens' sensitivity to dietary tannins varies according to their ability to denature these compounds with digestive enzymes, and several authors observed a marked decrease in egg production and an increased frequency of egg yolk mottling also at low inclusion levels in the diet (Chang and Fuller, 1964;Vohra et al, 1966;Fuller et al, 1967;Begovic et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

Nutritional characteristics and quality of eggs from laying hens fed on a diet supplemented with chestnut tannin extract (Castanea sativaMiller)

Minieri

Buccioni

Serra

et al. 2016

British Poultry Science

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1. The trial was performed with 80 laying hens belonging to two Tuscan autochthonous breeds: 40 birds of the Mugellese (MU) breed and 40 of the White Leghorn (WL) breed. 2. The animals were allotted to 4 groups of individually caged 20 hens each: two groups were fed on a commercial diet and worked as the control groups (MUC and WLC); the other two groups received the same diet, integrated with 2 g of chestnut tannin (CT) extract per kg of diet (MUT and WLT). 3. A sample of 70 eggs were randomly collected and analysed for cholesterol content, fatty acid (FA) profile, weight, thickness of shell and colour of yolk. 4. Physical parameters, including yolk colour, and indices of egg quality were not affected by the treatments. 5. The concentration of unsaturated FAs increased, whereas cholesterol was significantly decreased: −17% in WLT and −9% in MUT. Dietary supplementation with CT extract resulted in a modification of lipid composition, towards a more healthy quality of eggs.

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The Growth Depressing and Toxic Effects of Tannins to Chicks

Cited by 131 publications

References 13 publications

Feeding Forage in Poultry: A Promising Alternative for the Future of Production Systems

Feeding Forage in Poultry: A Promising Alternative for the Future of Production Systems

Seasonal Changes in Oak Leaf Tannins and Nutrients as a Cause of Spring Feeding by Winter Moth Caterpillars

Nutritional characteristics and quality of eggs from laying hens fed on a diet supplemented with chestnut tannin extract (Castanea sativaMiller)

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