Effects of Different Combinations of Oat Hay and Whole Corn Silage on Ruminal Fermentation of Sheep

ZHANG Biyang, ZHAO Guiqin, JIAO Ting, CHAI Jikuan, GOU Zhiqiang, XU Xingze, YAN Chetai

doi:10.3969/j.issn.1006-267x.2017.10.017

Chinese Journal of Animal Nutrition >

2017 , Vol. 29 >Issue 10: 3563 - 3573

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.10.017

Molecular Nutrition

Effects of Different Combinations of Oat Hay and Whole Corn Silage on Ruminal Fermentation of Sheep

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1. College of Pratacultural Science, Gansu Agricultural University, Lanzhou 730070, China;
2. Key Laboratory of Grassland Ecosystem, Ministry of Education, Lanzhou 730070, China;
3. Pratacultural Engineering Laboratory of Gansu Province, Lanzhou 730070, China;
4. Sino-US Center for Grazingland Ecosystem Sustainability, Lanzhou 730070, China

Received date: 2017-03-16

Online published: 2017-09-28

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Abstract

This experiment was conducted to investigate the effects of different combinations of oat hay and whole corn silage on ruminal fermentation of sheep. Nine cross breed (Merino×Mongolian) rams with similar body condition, body weight of (70.24±2.03) kg and fitted with permanent rumen cannulas were selected and divided into three groups with three sheep per group according to the weighting result of transitional period, and their diets were grouped as three according to the ratio of oat hay and whole corn silage in the roughage (dry matter basis), i.e., A1 (100% whole corn silage), A2 (50% oat hay+50% whole corn silage) and A3 (100% oat hay), and the concentrate-to-forage ratio of three diets was 35:65. A 3×3 Latin square design was used. Three trial periods were conducted with 22 days for each period (15 days for pretest and 7 days for formal test). Samples were taken at the last 3 days of the formal test. The results showed as follows:1) compared with 100% whole corn silage, taking 50% oat hay+50% whole corn silage or 100% oat hay as roughage had no significant effects on pH and total nitrogen concentration in ruminal fluid, but significantly reduced the means of ruminal fluid urea nitrogen, ammoniacal nitrogen (NH₃-N), and plasma urea nitrogen concentrations (P<0.05); in the meantime, taking 50% oat hay+50% whole corn silage as roughage significantly increased the mean of protein nitrogen concentration in ruminal fluid (P<0.05). Besides, compared with A3 group, A2 group had slightly higher the means of ruminal fluid pH and total nitrogen concentration, lower ruminal fluid and plasma urea nitrogen concentration means, and its ruminal fluid protein nitrogen concentration mean increased by 8.97%, but no significant differences in above indices were found (P>0.05). The mean of ruminal fluid NH₃-N concentration in A2 group was significantly lower than that in A3 group (P<0.05). 2) Adding oat hay in diet did not change the mean of ruminal fluid total volatile fatty acid concentration and propionic acid molar ratio, but increased the mean of ruminal fluid acetate acid, butyric acid molar ratios and acetate/propionate (P<0.05), and those in A3 group were significantly higher than those in A1 group (P<0.05). In conclusion, base on the same concentrate and the concentrate-to-forage ratio of 35:65, mixing 50% oat hay with 50% whole corn silage in sheep diet can improve rumen environment, microbe growth and activity, increase ammonia (NH₃) utilization, help microbe protein synthesis, and also increase acetate acid molar ratio and acetate/propionate.

Key words： oat hay; ruminal fermentation; pH; nitrogen metabolism; volatile fatty acid

Cite this article

ZHANG Biyang, ZHAO Guiqin, JIAO Ting, CHAI Jikuan, GOU Zhiqiang, XU Xingze, YAN Chetai . Effects of Different Combinations of Oat Hay and Whole Corn Silage on Ruminal Fermentation of Sheep[J]. Chinese Journal of Animal Nutrition, 2017 , 29(10) : 3563 -3573 . DOI: 10.3969/j.issn.1006-267x.2017.10.017

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