Effects of Neutral Detergent Fiber Levels in Diet on Milk Performance, Nutrient Apparent Digestibility and Serum Indices of Dairy Cows during Peak Lactation Period

SHI Renhuang; DONG Shuangzhao; FU Yao; WANG Yajing; CAO Zhijun; LI Shengli; ZHAO Guoqi

doi:10.3969/j.issn.1006-267x.2015.08.013

2015 , Vol. 27 >Issue 8: 2414 - 2422

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.08.013

Molecular Nutrition

Effects of Neutral Detergent Fiber Levels in Diet on Milk Performance, Nutrient Apparent Digestibility and Serum Indices of Dairy Cows during Peak Lactation Period

SHI Renhuang ,
DONG Shuangzhao ,
FU Yao ,
WANG Yajing ,
CAO Zhijun ,
LI Shengli ,
ZHAO Guoqi

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1. State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China;
2. College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China

Received date: 2015-03-16

Online published: 2015-08-13

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Abstract

This experiment was conducted to investigate the effects of neutral detergent fiber (NDF) levels in diet on milk performance, nutrient apparent digestibility and serum indices of dairy cows during peak lactation period. Eight Holstein dairy cows [(50±15) days in milk] were selected in a 4×4 Latin square design. The NDF level in diets was 25.05%, 28.05%, 31.22% and 34.19%, respectively. The experiment had 4 periods with 21 days per period, and each period had 14 days for pre-test and 7 days for formal test. The results showed as follows: 1) with the increase of NDF level in diet, the dry matter intake, milk yield, lactose yield, milk protein yield and nitrogen efficiency decreased linearly (P<0.05); milk fat percentage and milk urea nitrogen concentration increased linearly (P<0.05); feed efficiency and milk fat yield tended to increase linearly (P=0.05); milk protein percentage tended to decrease linearly (P=0.08); while 4% fat corrected milk yield and lactose percentage were not significantly influenced (P>0.05). 2) With the increase of NDF level in diet, the apparent digestibility of NDF and acid detergent fiber increased linearly (P<0.05). 3) With the increase of NDF level in diet, serum glucose and insulin concentrations reduced linearly (P<0.05); serum non-esterified fatty acids, β-hydroxybutyrate and urea nitrogen concentrations increased linearly (P<0.05); serum triglyceride (P=0.06) and cortisol concentrations (P=0.07) tended to increase linearly, but total cholesterol concentration was not significantly influenced (P>0.05). In conclusion, both the 25.05% NDF and 34.19% NDF in diet have negative influence on energy-nitrogen utilization and milk performance, while the 28.05% NDF level can be more reasonable for nitrogen utilization and better milk performance than 31.22% NDF. It is suggested that the supplemental level of NDF be 28.05% for dairy cows in the peak lactation period.

Key words： Holstein dairy cows; NDF; milk performance; nutrient apparent digestibility; serum indices

Cite this article

SHI Renhuang , DONG Shuangzhao , FU Yao , WANG Yajing , CAO Zhijun , LI Shengli , ZHAO Guoqi . Effects of Neutral Detergent Fiber Levels in Diet on Milk Performance, Nutrient Apparent Digestibility and Serum Indices of Dairy Cows during Peak Lactation Period[J]. Chinese Journal of Animal Nutrition, 2015 , 27(8) : 2414 -2422 . DOI: 10.3969/j.issn.1006-267x.2015.08.013

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