Effects of Physically Effective Neutral Detergent Fiber Level in Total Mixed Ration on Fatty Acid Composition in Rumen Fluid and Milk of Dairy Cows during Mid-Lactation Period

WANG Dangdang, ZHAO Huihui, XIAO Kaili, YAO Junhu, CAO Yangchun

doi:10.3969/j.issn.1006-267x.2018.07.046

2018 , Vol. 30 >Issue 7: 2841 - 2849

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.07.046

Molecular Nutrition

Effects of Physically Effective Neutral Detergent Fiber Level in Total Mixed Ration on Fatty Acid Composition in Rumen Fluid and Milk of Dairy Cows during Mid-Lactation Period

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College of Animal science and Technology, Northwest A & F University, Yangling 712100, China

Received date: 2018-01-04

Online published: 2018-07-20

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Abstract

This study was conducted to investigate the effects of physically effective neutral detergent fiber (peNDF) level in total mixed ration (TMR) on fatty acid composition in rumen fluid and milk of dairy cows during mid-lactation period. Based on a single factor experiment design, thirty healthy dairy cows with two parities, (120±8) days in milk, (33.03±1.59) kg of average daily milk yield and similar body condition were chosen as trial individuals and randomly divided into 3 groups with 10 cows per group. Three TMRs with different levels of peNDF were obtained by manipulating the mixing duration (H-peNDF:11.25%, M-peNDF:10.56%, L-peNDF:9.02%), and each group was fed one of the three TMRs. The concentrate to forage ratio was 60:40. The pretest period lasted for 21 days, and the test period lasted for 6 days. The results showed as follows:1) with the increase of peNDF level, C14:0, C14:1 trans9, C17:0 and C18:1 cis6 contents in rumen fluid were decreased, while C16:0 iso and C16:1 trans9 contents in rumen fluid were increased, and there were significant differences between H-peNDF group and L-peNDF group (P<0.05). 2) With the increase of peNDF level, C14:1 cis9,C15:1 cis10, C17:1 cis10, C18:1 cis11 and C18:2 trans9, 12 contents in milk were decreased, while C14:0 iso and C16:0 iso contents in milk were increased, and there were significant differences between H-peNDF group and L-peNDF group (P<0.05). With the increase of peNDF level, short chain fatty acid content in milk were increased, C14:1 △9-desaturase index and C18:1 △9-desaturase index were decreased, and there were significant differences between H-peNDF group and L-peNDF group (P<0.05). The results indicate that TMR with low level of peNDF (9.02%) can improve milk fatty acid composition under high concentrate condition.

Key words： peNDF; rumen fluid; milk; fatty acid composition; dairy cow

Cite this article

WANG Dangdang, ZHAO Huihui, XIAO Kaili, YAO Junhu, CAO Yangchun . Effects of Physically Effective Neutral Detergent Fiber Level in Total Mixed Ration on Fatty Acid Composition in Rumen Fluid and Milk of Dairy Cows during Mid-Lactation Period[J]. Chinese Journal of Animal Nutrition, 2018 , 30(7) : 2841 -2849 . DOI: 10.3969/j.issn.1006-267x.2018.07.046

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