Effects of Dietary Energy Density in the Dry Period on the Production Performance and Metabolism of Dairy Cows

• 作者: Gaozhan Cai Kerong Shi Qiuling Hou Xueyan Lin Yun Wang Zhengui Yan Zhiyong Hu Zhonghua Wang
• 来源期刊: 生命科学与技术进展(英文)
• 学科: 医学
• 关键词: Dry Period DAIRY COWS Energy Production Performance BIOCHEMICAL Indicator HORMONE Level
• 年，卷（期）: 2017,（3）
• 页码范围: 104-126
• 页数: 23页
• 分类号: R73

摘要

Thirty healthy Holstein dairy cows in the dry period were randomly divided into three groups and fed diets with different net energy for lactation (group A: 1.2 Mcal/kg DM, group B: 1.3 Mcal/kg DM, and group C: 1.4 Mcal/kg DM) for 8 weeks prepartum. Thereafter, dairy cows were fed a diet of the same formulation (1.66 Mcal/kg DM) for 12 weeks postpartum. The effects of different dietary energy densities in the dry period on postpartum performance and metabolic parameters of dairy cows were observed. Milk yield was reduced by 14.5% in the low-energy diet group;however, there were no differences in milk composition between the three groups. Postpartum plasma β-hydroxybutyrate, non-esterified fatty acid, growth hormone, and glucagon levels were significantly decreased whereas leptin and neuropeptide levels were elevated in the low-energy diet group. Moreover, body fat mobilization was attenuated, and the decline in postpartum body condition was reduced in the low-energy diet group, thus effectively reducing the postpartum negative energy balance.