Evaluation of Forage Nutritional Value of Alpine Meadow Grassland in Different Phenological Periods in Zeku County of Qinghai Province by in Vitro Method

ZHANG Qunying; LI Jie; HAO Lizhuang; LIU Shujie; CHAI Shatuo; NIU Jianzhang; ZHANG Xiaowei; WANG Xun; SUN Lu; DUOJI Ouzhu

doi:10.3969/j.issn.1006-267x.2020.03.048

2020 , Vol. 32 >Issue 3: 1415 - 1423

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.03.048

Evaluation of Forage Nutritional Value of Alpine Meadow Grassland in Different Phenological Periods in Zeku County of Qinghai Province by in Vitro Method

ZHANG Qunying ,
LI Jie ,
HAO Lizhuang ,
LIU Shujie ,
CHAI Shatuo ,
NIU Jianzhang ,
ZHANG Xiaowei ,
WANG Xun ,
SUN Lu ,
DUOJI Ouzhu

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1. Qinghai University, Xining 810016, China;
2. Academy of Science and Veterinary Medicine of Qinghai University, State Key Laboratory of Plateau Ecology and Agriculture, Key Laboratory of Plateau Grazing Animal Nutrition and Feed Science of Qinghai Province, Qinghai Plateau Yak Research Center, Xining 810016, China;
3. Yadong County Pastoral Service Centers of Tibet Autonomous Region Shigatse, Shigatse 857600, China

Received date: 2019-09-01

Online published: 2020-03-13

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Abstract

The aim of this experiment was to explore the dynamic changes of forage nutritional value of alpine meadow grassland in different phenological periods[January to April (hay period) and May to June (returning green period)] in Zeku county of Qinghai province in order to provide some basic data for accurate supplementary feeding of local grazing livestock. Local typical grazing pastures were chosen to collect edible forage in the middle of each month by tracking grazing yak from January of hay period to June of turning green period, 2018. The conventional nutrient contents of pasture were determined by common nutrient composition analysis method, and the in vitro fermentation method was used to measure the gas production (GP) and in vitro dry matter digestibility (IVDMD) at different fermentation time points, and the pH, ammonia nitrogen (NH₃-N) concentration and volatile fatty acid (VFA) contents in fermentation broth at fermentation 48 h. The results showed that the conventional nutrient contents and IVDMD of forage in May and June were significantly higher than those in other months (P<0.01), and the lowest values of them in January. With the nutritional quality of forage changed, 72 h GP and pH, NH₃-N concentration and VFA contents in fermentation broth also changed, the 72 h GP and NH₃-N concentration in May and June were significantly higher than those in other months (P<0.05), and those in January to March were significantly lower than those in other months (P<0.05 or P<0.01). On the total VFA content in fermentation broth, there was no significant difference between May and June (P>0.05), but they were significantly higher than other months (P<0.01), and the January was significantly lower than other months (P<0.01). In summary, the forage of alpine meadow grassland in Zeku county of Qinghai province has good nutritional quality in turning green period, but it in hay period has lower nutritional quality and can not meet the nutritional needs of grazing yaks. It is recommended for accurate feeding herders, rational use of grassland resources can promote the development of local animal husbandry.

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

Cite this article

ZHANG Qunying , LI Jie , HAO Lizhuang , LIU Shujie , CHAI Shatuo , NIU Jianzhang , ZHANG Xiaowei , WANG Xun , SUN Lu , DUOJI Ouzhu . Evaluation of Forage Nutritional Value of Alpine Meadow Grassland in Different Phenological Periods in Zeku County of Qinghai Province by in Vitro Method[J]. Chinese Journal of Animal Nutrition, 2020 , 32(3) : 1415 -1423 . DOI: 10.3969/j.issn.1006-267x.2020.03.048

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