Feed Science and Technology

Effects of Tannin and Polyetylene Glycol on Ruminal Microorganism Quantity and Nutrient Apparent Digestibility of Sheep and Goats

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  • College of Animal Science, Inner Mongolia Agricultural University, Hohhot 010018, China

Received date: 2015-04-15

  Online published: 2015-10-15

Abstract

This experiment was designed to study the effects of different dietary tannin levels and high tannin diet supplemented with polyetylene glycol (PEG) on ruminal microorganism quantity and nutrient apparent digestibility of sheep and goats.Four Mongolia sheep and four cashmere goats aged 1.5 to 2.0 years, weighted 45 kg, fitted with permanent ruminal cannulas were selected as experimental animals.A self-control design was applied, and the study comprised four periods.Animals at stage 1 were fed a basal diet (group Ⅰ, control group), and those at stages 2, 3 and 4 were fed the basal diet additionally supplemented with 2% tannin (group Ⅱ), 6% tannin (group Ⅲ) and 6% tannin+12% PEG (group Ⅳ) of feed intake, respectively.Each stage lasted for 30 days with 12 days of pre-test period and 18 days of test period.The results showed as follows: 1) for goats, the apparent digestibility of organic matter (OM), crude protein (CP) and acid detergent fiber (ADF) in group Ⅲ, dry matter (DM), OM and CP in group Ⅳ were significantly lower than those in control group (P<0.05).However, no significant differences were observed among groups in nutrient apparent digestibility of sheep (P>0.05).2) Ruminal protozoa number of sheep in groups Ⅲ and Ⅳ before morning feeding (0 h), and that of sheep and goats in group Ⅳ were significantly lower than that in control group(P<0.05).3) At 0 h, the quantity of ruminal general bacteria of sheep and goats in experimental groups was significantly lower than those in control group (P<0.05).At 6 h, the quantity of ruminal general anaerobic fungi of goats in groups Ⅱ and Ⅲ was significantly decreased (P<0.05).The results indicate that the quantity of ruminal general bacteria and general anaerobic fungi, as well as nutrient apparent digestibility, can be decreased by supplementation of tannin, and the effects on growth of general bacteria can be mitigated by PEG; ruminal microorganism flora of goats is easier to be affected by tannin than that of sheep.

Cite this article

LI Dabiao, YU Yongqiang, WANG Weiyun, ZHANG Meimei, LI Honglei, XING Yuanyuan . Effects of Tannin and Polyetylene Glycol on Ruminal Microorganism Quantity and Nutrient Apparent Digestibility of Sheep and Goats[J]. Chinese Journal of Animal Nutrition, 2015 , 27(10) : 3155 -3162 . DOI: 10.3969/j.issn.1006-267x.2015.10.022

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