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Effects of dietary n‐6/n‐3 fatty acid ratio on nutrient digestibility and blood metabolites of H anwoo heifers
Author(s) -
Kim Dong Hyeon,
Lee Hyuk Jun,
Amanullah Sardar M.,
Adesogan Adegbola T.,
Kim Sam Churl
Publication year - 2016
Publication title -
animal science journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.606
H-Index - 38
eISSN - 1740-0929
pISSN - 1344-3941
DOI - 10.1111/asj.12401
Subject(s) - chemistry , dry matter , propionate , fatty acid , metabolite , hanwoo , neutral detergent fiber , total mixed ration , zoology , digestion (alchemy) , polyunsaturated fatty acid , food science , biochemistry , biology , lactation , chromatography , pregnancy , genetics , ice calving
The objectives of this study were to investigate the effects of dietary n‐6/n‐3 fatty acid ( FA ) ratio on digestibility, blood metabolites and FA profile of H anwoo heifers. Fifteen H anwoo heifers (22 ± 3 months old; 357 ± 69.7 kg) were randomly assigned to three dietary treatments with n‐6/n‐3 FA ratios of 2.07, 5.18 and 7.37. The animals were housed individually in digestion crates and fed total mixed rations at 2.2% of body weight for 2 weeks of adaptation and 1 week of collection. Treatment effects on in vivo digestibility, plasma metabolite and fatty acid profiles, and in vitro ruminal fermentation and fatty acid profiles were examined. In vivo digestibility was not affected ( P > 0.05) by dietary n‐6/n‐3 FA ratio. However, in vitro dry matter digestibility and concentrations of total volatile fatty acids and propionate decreased ( P < 0.05) linearly with increasing n‐6/n‐3 FA ratio. Plasma insulin and progesterone increased linearly ( P < 0.05), but linolenic acid and total n‐3 FA decreased linearly ( P < 0.05) with increasing n‐6/n‐3 ratio. Increasing the dietary n‐6/n‐3 FA ratio can increase the n‐6/n‐3 FA ratio in plasma and ruminal fluid as well as plasma progesterone secretion.