Effects of Supplemental Dietary Energy Source on Feed Intake, Lactation Performance, and Serum Indices of Early-Lactating Holstein Cows in a Positive Energy Balance

• 作者: Guimei Liu Kerong Shi Qiuling Hou Xueyan Lin Yun Wang Zhengyan Yin Zhonghua Wang
• 来源期刊: 生命科学与技术进展(英文)
• 学科: 医学
• 关键词: DAIRY COW LACTATION Energy Source 5-HYDROXYTRYPTAMINE
• 年，卷（期）: smkxyjsjzyw,（2）
• 页码范围: 68-77
• 页数: 10页
• 分类号: R73

摘要

The present study investigated the effects of the supplemental dietary energy source on early lactating cows in a positive energy balance. Cows in the control group were fed a basal total mixed ration containing high-quality hay as forage, and the dietary concentrate to forage ratio was 45:65. The corn supplementation resulted in a significant decrease in the milk fat content (P P = 0.15), whereas the fat supplementation resulted in a decreasing trend of the milk protein and lactose content (P ≤ 0.1). Additionally, the corn supplementation significantly decreased the serum 5-hydroxytryptamine level (P < 0.05). The results support the proposal that the source of supplemental dietary energy has varying effects on feed intake, lactation performance, and the intermediate metabolism of early lactating cows in a positive energy balance. 5-Hydroxytryptamine secretion may be associated with the varying effects of the source of supplemental dietary energy.