Studies on the Influences of Niacin on Physiological Parameters and Milk Production of Holstin Cows——I .Influences of Niacin Supplementation on the Ruminal Digestion and Metabolism
Studies on the Influences of Niacin on Physiological Parameters and Milk Production of Holstin Cows——I .Influences of Niacin Supplementation on the Ruminal Digestion and Metabolism
烟酸对奶牛生理参数及生产性能影响的研究——.烟酸对瘤胃消化代谢的影响