Effects of increased atmospheric temperature and CO2 concentration during crop growth on the rumen degradability of wheat straw

doi:10.11686/cyxb2016053

Abstract

Abstract: This experiment was conducted to investigate the effects of increasing atmospheric temperature and CO₂ concentration during crop growth on the rumen degradability of wheat straw. The experiment consisted of a control group (wheat plants grown with a mean temperature of 10.5 ℃ and a CO₂ concentration of 413 μmol/mol) and three treatments: elevated CO₂ (CO₂ group, wheat plants grown with a CO₂ concentration of 500 μmol/mol); an elevated temperature group (TEM group, wheat plants grown under a 2 ℃ increase in temperature); and a CO₂ and temperature group (CO₂+TEM group, wheat plants grown with elevated temperature and CO₂ concentration). At harvest, the wheat straw was collected and the in situ degradability was monitored in three fistulated Holstein dairy cows. The results showed that the proportion of rapidly degraded dry matter (DM) was significantly greater in the TEM group than in the control group (P<0.05). The slowly degraded proportion and rumen degradability of acid detergent fiber (ADF) were significantly decreased in the TEM group compared with the control group (P<0.05). In the CO₂ group, the rumen degradability of DM, organic matter (OM), neutral detergent fiber (NDF), and ADF was significantly decreased (P<0.05), and the effective degradability of DM, OM, and NDF was significantly decreased also (P<0.05). In the CO₂+TEM group, the rumen degradability of DM, OM, NDF, and ADF was significantly decreased (P<0.05), and the slowly degraded proportion and the effective degradability of DM, OM, and ADF was significantly decreased also (P<0.05). The treatments were ranked, from highest rumen degradability of DM, OM, NDF, and ADF to lowest, as follows: control group>TEM group>CO₂ group>CO₂+TEM group. These results showed that increased temperature and CO₂ concentration significantly decreased the in situ degradation of DM, OM, NDF, and ADF, and resulted in decreased nutritional value of wheat straw. The lowest nutritional value of wheat straw was in the CO₂+TEM group.

HE Xiang-Yu, MU Chun-Long, CAI Min, WU Yan-Ping, YANG Yu-Xiang, MAO Sheng-Yong, CHENG Yan-Fen, ZHU Wei-Yun. Effects of increased atmospheric temperature and CO₂ concentration during crop growth on the rumen degradability of wheat straw[J]. Acta Prataculturae Sinica, 2016, 25(12): 111-118.

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Effects of increased atmospheric temperature and CO₂ concentration during crop growth on the rumen degradability of wheat straw

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