高寒草甸草地天然放牧场不同月份牧草营养价值评价

doi:10.16431/j.cnki.1671-7236.2020.04.012

Abstract

Abstract: The aim of this experiment was to explore dynamic changes in the nutritional value of forage in alpine meadow grassland natural pastures in different months (July to December) in Yushu county of Qinghai province.From July 2017 to the middle of December 2017,a typical local grazing grassland was selected to track and graze yaks to simulate the collection of edible forage.And conventional nutritional content determination and in vitro fermentation technology were used to measure the gas production (GP),digestibility of dry matter in vitro (IVDMD) and other indicators of 48 h.The nutritional value of forage in each month was comprehensively evaluated to provide basic data for pasture value.The results showed that the content of crude protein (CP),crude fat (EE),Ash,neutral washing soluble matter (NDS) and digestive energy (DE),metabolic energy (ME),IVDMD of forage in July and August were extremely significantly different than other months (P < 0.01),and they were low in November and December.While the content of neutral detergent fiber (NDF),acid detergent fiber (ADF) and hemicellulose (HC) were extremely significant higher in November and December than other months (P < 0.01),and at low level in July and August.The pH and NH₃-N concentration of rumen fluid in different months had no significant difference (P > 0.05).The GP and the concentration of volatile fatty acids (VFA) were significantly different between different months(P < 0.05),the value of GP and VFA in July and August were extremely significantly higher than other months (P < 0.01),and were extremely significantly lower in November than in other months (P < 0.01).The concentration of total volatile fatty acid (TVFA) had no significant difference among different months (P > 0.05),but the value was higher in July and September.In summary,the pastures of the typical alpine meadow pastures had good nutritional quality in July and August,but the nutritional quality of pastures were low from October to December,which could’t meet the nutritional needs of grazing yaks.The accurate feeding herders and rational use of grassland resources was recommended to promote the development of local animal husbandry.

Key words: fermentation in vitro; forage; nutritional value; digestibility of dry matter in vitro

CLC Number:

S812.8

ZHANG Qunying, ZHOU Yixiu, HAO Lizhuang, LIU Shujie. Evaluation of Forage Nutritional Value in Alpine Meadow Grassland Natural Pastures in Different Months[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(4): 1070-1079.

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Evaluation of Forage Nutritional Value in Alpine Meadow Grassland Natural Pastures in Different Months

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