Effects of Different Lengths of Feeding-Ramie Silage on Rumen Fermentation Parameters and Cellulase Activities of Black Goats

SUN Shengnan, LIN Qian, XIANG Hai, HOU Zhenping, ZHONG Rongzhen, DAI Qiuzhong, WU Duanqin

doi:10.3969/j.issn.1006-267x.2019.01.056

2019 , Vol. 31 >Issue 1: 477 - 484

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.01.056

Molecular Nutrition

Effects of Different Lengths of Feeding-Ramie Silage on Rumen Fermentation Parameters and Cellulase Activities of Black Goats

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1. Institute of Bast Fiber Crops, Chinese Academy of Agricultural Sciences, Changsha 410205, China;
2. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China;
3. Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China

Received date: 2018-06-13

Online published: 2019-01-16

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Abstract

This experiment was conducted to investigate the effects of different lengths of feeding-ramie silage on rumen fermentation parameters and cellulase activities of black goats. Twelve black goats with similar body weight[(20.35±2.16) kg] were randomly divided into 4 groups with 4 goats per group. Goats in the 4 groups were fed total mixed rations (TMRs) which used the feeding-ramie silage as a roughage, and the lengths of feeding-ramie silage were 1, 2 and 3 cm, respectively. On the 11th day of feeding, the rumen contents were collected by the oral cavity at 0.5, 2.0 and 6.0 h after morning feeding, and the rumen fermentation parameters and cellulase activities were measured. The results showed as follows:1) the length of feeding-ramie silage had no significant effect on average daily intake of goats (P>0.05). The pH in rumen fluid of 1 cm group was significantly lower than that of 2 and 3 cm groups at 0.5 and 2.0 h after morning feeding (P<0.05). The rumen fluid ammonia nitrogen concentration of 1 cm group was the lowest, and it significantly lower than that of 2 and 3 cm groups at 2.0 h after morning feeding (P<0.05). 2) The length of feeding-ramie silage had significant effects on the acetic acid to propionic acid ratio (P=0.026), especially the acetic acid to propionic acid ratio of 3 cm group was lower than that of other two groups at all time points, but there were no significant effects on individual volatile fatty acids (VFAs) and total VFAs (P>0.05). 3) The length of feeding-ramie silage had no significant influences on cellulose activities in rumen fluid (P>0.05), but the sampling time had a significant effect on β-glucuronidase, pectinase and xylanase activities in rumen fluid (P<0.05), and the feeding-ramie silage length and sampling time had significant interaction effects on carboxymethyl cellulase and xylanase activities in rumen fluid (P<0.05). In conclusion, the feeding-ramie silage with 3 cm chopped length is more conducive to rumen fermentation of black goats under this experiment conditions.

Key words： feeding-forage ramie; silage; rumen fermentation; cellulase activities

Cite this article

SUN Shengnan, LIN Qian, XIANG Hai, HOU Zhenping, ZHONG Rongzhen, DAI Qiuzhong, WU Duanqin . Effects of Different Lengths of Feeding-Ramie Silage on Rumen Fermentation Parameters and Cellulase Activities of Black Goats[J]. Chinese Journal of Animal Nutrition, 2019 , 31(1) : 477 -484 . DOI: 10.3969/j.issn.1006-267x.2019.01.056

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