Effects of Dietary Energy Levels on Rumen Fermentation, Digestion and Metabolism and Plasma Biochemical Parameters of Dairy Cows during Dry Period

WANG Fuwei; HE Yaqin; ZHENG Yuhui; SU Huawei; LI Shengli

doi:10.3969/j.issn.1006-267x.2021.10.028

2021 , Vol. 33 >Issue 10: 5690 - 5700

DOI: https://doi.org/10.3969/j.issn.1006-267x.2021.10.028

RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Dietary Energy Levels on Rumen Fermentation, Digestion and Metabolism and Plasma Biochemical Parameters of Dairy Cows during Dry Period

WANG Fuwei ,
HE Yaqin ,
ZHENG Yuhui ,
SU Huawei ,
LI Shengli

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1. Beijing Engineering Technology Research Center of Raw Milk Quality and Safety Control, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
2. Beijing Sunlon Livestock Development Company Limited, Beijing 100076, China

Received date: 2021-03-09

Online published: 2021-10-16

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Abstract

The aim of this study is to investigate the effects of dietary energy levels on rumen fermentation, digestion and metabolism and plasma biochemical parameters of dairy cows during dry period. Four ruminally cannulated Holstein cows with similar body weight, body condition score and expected date of childbirth were used in a 4×4 Latin square design, and fed different energy levels (net energy for lactating were 5.46, 5.78, 6.11 and 6.43 MJ/kg DM, respectively) diets. The results showed that with the dietary energy level increasing, the rumen pH tended to decrease of dairy cows during dry period (0.05<P<0.10), the ammonia nitrogen content tended to increase (0.05<P<0.10), the propionate content significantly increased (P<0.05), and the acetate/propionate significantly decreased (P<0.05); the dry matter apparent digestibility, total nitrogen excretion of feces and urine and nitrogen retention of dairy cows during dry period significantly increased (P<0.05), the nitrogen utilization efficiency tended to increase (0.05<P<0.10), and the neutral detergent fiber (NDF) and acid detergent fiber (ADF) apparent digestibilities and ratio of total nitrogen excretion of feces and urine to nitrogen intake tended to decrease (0.05<P<0.10); the plasma insulin content of dairy cows during dry period significantly increased (P<0.05), the glucose content tended to increase (0.05<P<0.10), and the nonesterified fatty acids content significantly decreased (P<0.05). In conclusion, feeding high energy level diet for dairy cows during dry period can promote the feed intake, increase nutrient apparent digestibility, nitrogen utilization rate and hepatic gluconeogenesis precursor substances yield, and improve the energy balance of dairy cows during dry period.

Key words： dry period; dairy cows; dietary energy; rumen fermentation; digestion and metabolism; blood parameters

Cite this article

WANG Fuwei , HE Yaqin , ZHENG Yuhui , SU Huawei , LI Shengli . Effects of Dietary Energy Levels on Rumen Fermentation, Digestion and Metabolism and Plasma Biochemical Parameters of Dairy Cows during Dry Period[J]. Chinese Journal of Animal Nutrition, 2021 , 33(10) : 5690 -5700 . DOI: 10.3969/j.issn.1006-267x.2021.10.028

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