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Milk Conjugated Linoleic Acid (CLA) Profile and Metabolic Responses of Dairy Cows Fed with High-temperature-micro-time (HTMT) Treated Diets Containing High Quantity Extruded Soybean (ESB)

Authors
Lee, H. G.Hong, Z. S.Wang, J. H.Xu, C. X.Jin, Y. C.Kim, T. K.Kim, Y. J.Song, M. K.Choi, Y. J.
Issue Date
11월-2009
Publisher
ASIAN-AUSTRALASIAN ASSOC ANIMAL PRODUCTION SOC
Keywords
HTMT; Milk Fat; CLA; Metabolic Response; Holstein Cow
Citation
ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES, v.22, no.11, pp.1504 - 1512
Indexed
SCIE
SCOPUS
KCI
OTHER
Journal Title
ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES
Volume
22
Number
11
Start Page
1504
End Page
1512
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/118994
DOI
10.5713/ajas.2009.70354
ISSN
1011-2367
Abstract
A feeding trial was conducted to examine the effect of high-temperature-micro-time (HTMT) processing of diets containing extruded soybean (ESB) in high quantity on milk fat production. metabolic responses, and the formation of conjugated linoleic acid (CLA) and trans-vaccenic acid (TVA). Twenty-one multiparous Holstein cows in mid-lactation were blocked according to milk yield in the previous lactation. Cows within each block were randomly assigned to either normal concentrate or HTMT treated diets containing ESB (7.5% HTMT-ESB and 15% HTMT-ESB). It was hypothesized that the HTMT-ESB would affect the undegradable fatty acids in the rumen and, thus. would modify the fatty acid profile of milk fat. Both 7.5% and 15% HTMT-ESB did not affect milk yield., fat, protein, lactose and solid-not-fat (SNF), but the proportion of cis-9, trans-11 CLA in milk fat was significantly increased by these treatments. Content of TVA in milk fat was not affected by HTMT-ESB. The HTMT-ESB influenced the fatty acid profile in milk fat, but there was little difference between 7.5% and 15% of supplementation. HTMT-ESB feeding significantly decreased the concentration of plasma insulin and glucose, while plasma growth hormone (GH), triglyceride (TG), non-esterified fatty acid (NEFA) and HDL-cholesterol were increased by 7.5% and 15% ESB-HTMT supplementation in comparison to the control group (p<0.05). However, no significant difference was observed in plasma LDL-cholesterol, insulin like growth factor (IGF)-1. T3, T4, and leptin concentrations among treatments (p>0.05). The present results showed that cis-9, trans-11 CLA production was increased by HTMT treatment of dietary ESB without reduction of milk fat, and the unchanged milk fat and yield was assumed to be associated with the constant level of thyroid hormones, leptin. and IGF-1.
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