Tannins in livestock feeds in China

文献类型： 外文期刊

第一作者： Diao, QY

作者： Diao, QY;Qi, GG

作者机构：

关键词： tannins;sorghum;digestive enzymes;livestock feed;poultry studies;digestibility

期刊名称：TANNINS IN LIVESTOCK AND HUMAN NUTRITION, PROCEEDINGS

ISSN：

年卷期： 2000 年 92 期

页码：

收录情况： SCI

摘要： Sorghum is one of the most important crops in China. It is used mainly as a livestock feed, although it has some, use as human food, as well as for brewing. There are about 7000 varieties and hybrids including,native and introduced species being cultivated in the country. The quality and quantity of the food supply in China is getting more and more serious as the Chinese population increases. Therefore, it is urgent to explore the use of alternate feeds such as sorghum. The effect of dietary tannins in sorghum on the performance of animals has been the subject of study for many years in China. Three poultry studies, a feeding trial with broiler chicks, a balancing trial with adult leghorn cocks, and a duck study on the effects of digestive enzymes, are reviewed in this paper. The main results are summarised as follows: 1. Broiler chicks could tolerate up to 0.48% and 0.64% dietary tannin in sorghum in the first four weeks and last four weeks of age respectively without any adverse effects on weight gain, feed efficiency, dressing percentage, total serum lipid content, serum cholesterol content and glutamate-pyruvate transaminase levels. However, feeding chicks with sorghum may reduce leg and skin pigmentation. 2. In the balancing trial with adult leghorn cocks, it was observed that as dietary tannin content increased, protein retention, dry Tatter (DM) digestibility, and metabolic rate of gross energy decreased. However, there was no significant difference between 0% and 0.64% tannin diets on digestibility of DM and the metabolic rate of gross energy. 3. When commercial tannin was added to duck diets at a level of 1.5% DM, it was shown that tannin could significantly reduce total proteinase, trypsin and alpha-amylase activities in the small intestine of Shaoxing duck.

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