Clays as dietary supplements for swine: A review

Journal of Animal Science and Biotechnology

In Ho Kim¹  Mohana Devi Subramaniam¹ 

[1] Department of Animal Resource and Science, Dankook University, No. 29 Anseodong, Cheonan 330-714, Chungnam, South Korea

关键词: Zeolite;    Montmorillonite;    Feed additive;    Clinoptilolite;    Clay;    Animal production;   

Others  :  1224549
DOI  :  10.1186/s40104-015-0037-9

 received in 2015-06-11, accepted in 2015-07-30,  发布年份 2015

【 摘 要 】

Clays are crystalline, hydrated aluminosilicate molecules composed of alkali and alkaline earth cations along with small amounts of various other elements. The best-known are montmorillonite, smectite, illite, kaolinite, biotite and clinoptilolite. The molecules in these clays are arranged in three-dimensional structures creating internal voids and channels capable of trapping a wide variety of molecules. As a result of this structure, clay minerals are regarded as a simple and effective tool for the prevention of the negative effects of many toxic compounds. Dietary supplementation with clays has been shown to improve weight gain and feed conversion in pigs. Where improvements in performance have been noted, one of the most likely explanations for the improvement is the fact clays increase nutrient digestibility. Clays reduce the speed of passage of feed along the digestive tract which allows more time for digestion. Feeding clays also causes morphological changes in the intestinal mucosa such as an increase in villus height and an increase in the villus height to crypt depth ratio. These changes increase the surface area of the gastrointestinal tract thus increasing nutrient digestibility. Several studies have indicated that feeding clay reduces the incidence, severity and duration of diarrhea in pigs. The mechanism for the reduction in diarrhea is likely due to increases in the numbers of Bifidobacteria and Lactobacillus and decreases in Clostridia and E. coli in the small intestine of pigs fed clays. In addition, the numbers of pigs born alive and weaned, birth weight and weaning weight have been shown to be higher for sows fed clays. Several studies have indicated that clays can help mitigate the effects of mycotoxins. The aim of the present review is to focus on the various clays which have been given attention in recent research and to discuss their potential to improve pig performance.

【 授权许可】

   
2015 Subramaniam and Kim.

【 图 表 】

Fig. 1.

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