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Estimation of tannins in different sorghum varieties and their effects on nutrient digestibility and absorption of some minerals in caged white leghorn layers

Mahmood, S. (University of Agriculture, Faisalabad (Pakistan). Dept. of Poultry Science) Ali, H. (University of Agriculture, Faisalabad (Pakistan). Dept. of Poultry Science) Ahmad, F. (University of Agriculture, Faisalabad (Pakistan). Dept. of Poultry Science) Iqbal, Z. (University of Agriculture, Faisalabad (Pakistan). Dept. of Parasitology)

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Condensed tannin content of seven varieties of sorghum (White, Sandalbar, YS-98, JS-88, JS-263, JS-2002 and Hegari) found in Pakistan were determined and their effect on nutrient digestibility and absorption of minerals was investigated in White Leghorn Layers. For digestibility trial, 20 individually caged White Leghorn layers (30 weeks of age) were divided randomly into four experimental groups (5 birds/group) where each bird served as a replicate. Four isocaloric and isonitrogenous experimental diets i.e. control (C), low tannin (LT), medium tannin (MT) and high tannin (HT) were prepared. Diet C was without tannin; whereas, diet LT, MT and HT contained 1, 2 and 3 percent sorghum tannin, respectively. Among the seven varieties of sorghum grains the highest amount of tannin (5.34%) was observed in the variety Sandalbar; whereas, the lowest concentration of tannin was observed in white sorghum (0.02%). All tannin containing diets reduced the digestibility of nitrogen and starch but the effect was more severe with 3% tannin. However, ether extract digestibility remained unaffected. The mineral contents (calcium, phosphorus, sodium, potassium, magnesium and iron) in the feces of layers using sorghum tannins were significantly (P less than 0.05) more than those using diets without tannin. The results revealed that the effect of tannins on mineral absorption was more severe in birds fed high tannin diet (3%) than that of low tannin diets.

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International Journal of Agriculture and Biology (Pakistan)

ISSN : 1560-8530

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