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Effects of garlic oil on milk fatty acid profile and lipogenesis‐related gene expression in mammary gland of dairy goats
Author(s) -
Zhu Zhi,
Hang Suqin,
Zhu Honglong,
Zhong Sheng,
Mao Shengyong,
Zhu Weiyun
Publication year - 2013
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.5829
Subject(s) - lipogenesis , conjugated linoleic acid , lactation , fatty acid , silage , lactose , food science , polyunsaturated fatty acid , dry matter , chemistry , linoleic acid , biology , zoology , endocrinology , medicine , biochemistry , lipid metabolism , pregnancy , genetics
BACKGROUND: Garlic oil (GO) has blood lipid‐lowering effects. Milk fatty acid (FA) originates partly from plasma, and can be affected by the mammary lipogenesis. This study aimed to investigate GO effects on milk FA profile and mammary lipogenesis‐related gene expression. Early‐lactation goats were randomly allocated to four treatments with six goats each, and offered corn silage ad libitum and fixed amount of 0.79 kg day −1 dry matter (DM) concentrate mixed with GO (0, 0.57, 1.14, 1.71 g kg −1 DM) for 30 days consisting of 26‐day adaptation. RESULTS: Intake of corn silage reduced ( P ≤0.05) as GO level increased in the concentrate. Lipase activity and lactose content linearly increased, while non‐esterified FA concentration quadratically decreased with increasing GO level ( P ≤0.05). The proportions of short‐ and medium‐chain (C14:0, C15:0 and C16:0) and saturated FA decreased, whereas C18, cis 9 trans 11 conjugated linoleic acid ( c 9 t 11 CLA), t 10 c 12 CLA, monounsaturated and polyunsaturated FA, and some ≥ C20 FA proportions increased in a linear manner with increasing GO level ( P ≤0.05). The mRNA abundance of genes remained unchanged ( P > 0.1) as GO level increased. CONCLUSION: Garlic oil altered milk FA profile and these effects may not be related to the mammary lipogenesis‐related genes expression. © 2012 Society of Chemical Industry