能量水平对舍饲育肥牦牛生长性能、屠宰性能、瘤胃发酵参数和瘤胃微生物数量的影响

doi:10.16431/j.cnki.1671-7236.2017.02.024

Abstract

Abstract:

This experiment was conducted to investigate the effects of energy level on growth performance,slaughter performance,ruminal fermentation parameters and the number of several rumen microorganisms in house-fed yaks. Single factor randomized block design was adopted in this study,and sixty healthy 3-year-old Maiwa yaks with an average body weight of (192.66±3.64) kg were randomly divided into 3 groups with 20 replicates per group and 1 yak per replicate. Diets for all groups had the same crude protein content (14.81%) and different net energy levels for gain (NE_g) with 4.17(LE),4.48(ME) and 4.79(HE) MJ/kg,respectively. The experiment was lasted for 97 days (7-day pretrial period and 90-day feeding trial). The results showed that compared with LE group,average daily gain (ADG) of ME (1 099.89 g/d) and HE (1 019.02 g/d) were increased by 27.26%(P < 0.01) and 17.90%(P < 0.01),respectively,the F/G trended to be significantly decreased (P=0.073) and slaughter rate trended to be significantly increased (P=0.092) than that of LE group. However,no significant difference was found on the dry matter intake (DMI) and net meat percentage among all treatment groups (P > 0.05).With the increase of diet energy level, pH in yak rumen tended to decrease significantly (P=0.064), and that of ME group was the lowest.The increase of diet energy level tended to significantly affect the isobutyric acid concentration (P=0.063) and the ratio of acetic acid to propionic acid (P=0.074).Total volatile fatty acids (TVFA) and acetic acid concentration of ME group were significantly higher than the other two groups (P < 0.05),of which the valeric acid concentration was extremely significantly increased with the increase of the diet energy level (P < 0.01).Increasing dietary energy level had a trend to decrease the relative content of R.flavefaciens,but there was no significant effects on the relative content of R.albus and F.succinogenes (P > 0.05). In conclusion,we recommend 4.48 MJ/kg (DM basis) as a diet appropriate NE_g level for the barn feeding of fattening yak under this experimental condition.

Key words: house-fed yak; energy level; growth performance; slaughter performance; ruminal fermentation parameters; rumen microorganisms

CLC Number:

S823.8⁺5

WANG Bin-xing, CHEN Guang-ji, GUO Chun-hua, PENG Zhong-li, WANG Yong, TANG Shan-hu, JIAN Shang-lin. Effects of Energy Level on Growth Performance, Slaughter Performance, Ruminal Fermentation Parameters and Rumen Microorganisms Number in House-fed Yaks[J]. , 2017, 44(2): 469-475.

References

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Effects of Energy Level on Growth Performance, Slaughter Performance, Ruminal Fermentation Parameters and Rumen Microorganisms Number in House-fed Yaks

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