Effect of oilseeds rich in linoleic and linolenic acids on milk production and milk fatty acid composition in dairy cows

doi:10.1007/s11703-009-0022-1

Front Agric Chin

2009, Vol. 3

Issue (3) : 311-318 https://doi.org/10.1007/s11703-009-0022-1

RESEARCH ARTICLE

Effect of oilseeds rich in linoleic and linolenic acids on milk production and milk fatty acid composition in dairy cows

Yanxia GAO, Tao SUN, Jianguo LI(

)

Department of Animal Science and Technology, Agricultural University of Hebei, Baoding 071001, China

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Abstract

Nine multiparous cows averaging 93±13 days in milk production (DIM) were used in a triple 3×3 Latin square design to determine the effects of feeding them whole roasted flaxseed, cracked roasted soybean and fresh alfalfa in the diet on milk production, milk fatty acid profiles and the digestibility of nutrients. Each experimental period lasted 30 d and a sample collection was performed during the last 7 d. The cows were fed on the control basal diet (CON) or diets containing whole roasted flaxseed (FLA) or cracked roasted soybean (SOY). All diets were fed as a total mixed ration (TMR) and had similar concentrations of crude protein (CP), Net Energy Lactation (NEL), acid detergent fibre (ADF) and neutral detergent fibre (NDF). The dry matter intake (DMI) was not significantly different (P>0.05), but tended to increase in FLA and SOY diets compared with the control (P>0.05). Cows in all treatments had a similar milk yield, although 4% fat corrected milk (FCM) yield was higher on the FLA and SOY diets than on the CON diet. Milk fat percentage (3.45%) increased in the FLA diet compared with the control (3.31%) and SOY diets (3.39%). Milk protein percentages were similar among the diets (P>0.05). There were similar digestibilities of DM, CP and ADF among the treatments and lower digestibilities of NDF and ether extract in the SOY diet compared with the CON diet. Feeding various oilseeds significantly increased the concentrations of C_18∶1, C_18∶3 and conjugated linoleic acid (CLA). The FLA diet decreased the ratio of omega-6 to omega-3 fatty-acids in the milk, which would improve the nutritive value of the milk.

Keywords oilseed conjugated linoleic acid milk fatty acid dairy cow

Corresponding Author(s): LI Jianguo,Email:jgli@hebau.edu.cn

Issue Date: 05 September 2009

Cite this article:

Yanxia GAO,Tao SUN,Jianguo LI. Effect of oilseeds rich in linoleic and linolenic acids on milk production and milk fatty acid composition in dairy cows[J]. Front Agric Chin, 2009, 3(3): 311-318.

URL:

https://academic.hep.com.cn/fag/EN/10.1007/s11703-009-0022-1
https://academic.hep.com.cn/fag/EN/Y2009/V3/I3/311

Tab.1 Ingredient and nutrient composition of experimental diets for lactating dairy cows

Tab.2 BW, DMI, milk yield and milk composition from cows fed experimental diets

Tab.3 Effect of dietary on apparent total tract digestibility of nutrients

Tab.4 Fatty acid composition of milk fat from feeding different fat sources (mg?g total fatty acid)

Tab.5 The content of different kind of fatty acid in milk and desaturated index (mg?g total fatty acid)

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