The results were followed: Supplemental niacin had no significant effect on the rectal temperature andrespiratory rate (P>0. 0).
The results were followed: Supplemental niacin had no significant effect on the rectal temperature andrespiratory rate (P>0. 0).
果表明： 添加Vc可以降低奶牛直肠温度、呼吸频率，但未达显著水平(P＞0.0)； 添加Vc对奶牛产奶量和乳成分无显著影响(P＞0.0)；