Effects of Different Roughage Grading Index and Carbohydrate Balance Index Combinational Diets on Milk Performance and Serum Biochemical Indexes of Mid-Lactating Dairy Cows

GUAN Pengyu, YE Ming, JIANG Ning, BU Dengpan, ZHANG Aizhong

doi:10.3969/j.issn.1006-267x.2019.03.020

2019 , Vol. 31 >Issue 3: 1152 - 1162

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.03.020

Molecular Nutrition

Effects of Different Roughage Grading Index and Carbohydrate Balance Index Combinational Diets on Milk Performance and Serum Biochemical Indexes of Mid-Lactating Dairy Cows

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1. College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
2. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Received date: 2018-08-01

Online published: 2019-03-18

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Abstract

The effects of different roughage grading index(GI) and carbohydrate balance index (CBI) combinational diets were studied on milk performance and serum biochemical indexes of mid-lactating dairy cows under the same dietary energy and protein levels in this experiment. The optimal combination of roughage was screened by GI, and the CBI[CBI=physically effective neutral detergent fiber (peNDF)/ruminal degradable starch from grain (RDSG)] was changed by the type and content of the grain. A 2×2 two-factor factorial design was used with dietary GI of 10.83 and 10.33 and CBI of 1.48 and 1.62, respectively. Twenty-four mid-lactating Holstein dairy cows were selected and randomly divided into 4 groups with 6 cows per group, and the cows in the 4 groups were fed different GI and CBI combinational diets. The results showed as follows:1) GI and CBI had no significant effects on dry matter intake and main nutrient intakes of dairy cows (P>0.05), and there were no significant interactions between GI and CBI (P>0.05). GI had no significant effects on average milk yield and the milk yield at different time points (the 6th, 13th, 20th, 27th and 34th day of the trial period) (P>0.05), and CBI had significant effects on average milk yield and the milk yield at different time points except the 6th day (P<0.05). At the same GI, the milk yield increased with the CBI decreasing, and the group of GI=10.83 and CBI=1.48 had the relatively higher milk yield. The milk fat percentage, milk protein percentage, milk urea nitrogen content and milk somatic cell count were not significantly affected by GI, CBI and their interaction (P>0.05). The milk fat percentage of group GI=10.33 and CBI=1.48 was relatively higher, the milk urea nitrogen content of group GI=10.83 and CBI=1.62 was relatively higher, and the milk somatic cell count of group GI=10.33 and CBI=1.62 was relatively lower. 2) GI and CBI had no significant effects on the contents of total protein (TP), albumin (ALB), urea nitrogen (UN), total cholesterol (TC), triglyceride (TG), glucose (GLU), β-hydroxybutyrate (BHBA) and the activities of alanine transaminase (ALT) and aspartate aminotransferase (AST) in serum at different time points (the 6th, 13th, 20th, 27th and 34th day of the trial period) and their average values (P>0.05), and there were no significant interactions between GI and CBI (P>0.05). It is concluded that the milk yield is relatively higher when dairy cows fed the diets with GI=10.83 and CBI=1.48 in the mid-lactation period, and the milk quality is relatively well when dairy cows fed the diet with GI=10.33 and CBI=1.48 in the middle lactation. Under the condition of dietary CBI=1.48, the digestion and absorption of protein and lipids are better when GI=10.83, and the carbohydrate metabolism is better when GI=10.33.

Key words： roughage grading index; carbohydrate balance index; dairy cows; milk performance; serum biochemical indexes

Cite this article

GUAN Pengyu, YE Ming, JIANG Ning, BU Dengpan, ZHANG Aizhong . Effects of Different Roughage Grading Index and Carbohydrate Balance Index Combinational Diets on Milk Performance and Serum Biochemical Indexes of Mid-Lactating Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2019 , 31(3) : 1152 -1162 . DOI: 10.3969/j.issn.1006-267x.2019.03.020

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