scholarly journals Effects of Dietary Unsaturated Fatty Acids on Oocyte Quality and Follicular Development in Lactating Dairy Cows in Summer

2006 ◽  
Vol 89 (10) ◽  
pp. 3891-3903 ◽  
Author(s):  
T.R. Bilby ◽  
J. Block ◽  
B.C. do Amaral ◽  
O. Sa Filho ◽  
F.T. Silvestre ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Dairy Cows ◽  
Unsaturated Fatty Acids ◽  
Follicular Development ◽  
Oocyte Quality ◽  
Lactating Dairy Cows

scholarly journals Addition of unsaturated fatty acids improves digestion of mid lactating dairy cows

2014 ◽  
Vol 63 (244) ◽  
pp. 563-573 ◽  
Author(s):  
J.E. Freitas Júnior ◽  
F.P. Rennó ◽  
J.R. Gandra ◽  
L.N. Rennó ◽  
A.C. Rego ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Dairy Cows ◽  
Unsaturated Fatty Acids ◽  
Lactating Dairy Cows

scholarly journals Oocyte quality in lactating dairy cows fed on high levels of n-3 and n-6 fatty acids

Reproduction ◽  
2009 ◽  
Vol 138 (5) ◽  
pp. 771-781 ◽  
Author(s):  
Ali A Fouladi-Nashta ◽  
Karen E Wonnacott ◽  
Carlos G Gutierrez ◽  
Jin G Gong ◽  
Kevin D Sinclair ◽  
...  
Keyword(s):  
Amino Acids ◽  
Fatty Acids ◽  
Dairy Cows ◽  
Embryo Quality ◽  
Plasma Concentrations ◽  
Latin Square ◽  
Oocyte Quality ◽  
Reproductive Hormones ◽  
Developmental Potential ◽  
Lactating Dairy Cows

Different fatty acid (FA) sources are known to influence reproductive hormones in cattle, yet there is little information on how dietary FAs affect oocyte quality. Effects of three dietary sources of FAs (supplying predominantly palmitic and oleic, linoleic (n-6) or linolenic (n-3) acids) on developmental potential of oocytes were studied in lactating dairy cows. A total of 12 Holstein cows received three diets containing rumen inert fat (RIF), soyabean or linseed as the main FA source for three periods of 25 days in a Latin-square design. Within each period, oocytes were collected in four ovum pick-up sessions at 3–4 day intervals. FA profiles in plasma and milk reflected profiles of dietary FA sources, but major FAs in granulosa cells were not affected. Dietary FA source did not affect plasma concentrations of leptin, insulin, IGF1, GH, or amino acids. RIF led to a higher proportion of cleaved embryos than soya or linseed, but blastocyst yield and embryo quality were not affected. It is concluded that the ovary buffers oocytes against the effects of fluctuations in plasma n-3 and n-6 FAs, resulting in only modest effects on their developmental potential.

scholarly journals Dietary unsaturated fatty acids affect the mammary gland integrity and health in lactating dairy cows

2011 ◽  
Vol 5 (S4) ◽  
Author(s):  
Núria Mach ◽  
Jürgen van Baal ◽  
Leo Kruijt ◽  
Antoon Jacobs ◽  
Mari Smits
Keyword(s):  
Fatty Acids ◽  
Mammary Gland ◽  
Dairy Cows ◽  
Unsaturated Fatty Acids ◽  
Lactating Dairy Cows

Δ9 -desaturase activity in the mammary gland of lactating dairy cows

2002 ◽  
Vol 2002 ◽  
pp. 181-181
Author(s):  
A.L. Lock ◽  
P.C. Garnsworthy
Keyword(s):  
Fatty Acids ◽  
Oleic Acid ◽  
Mammary Gland ◽  
Dairy Cows ◽  
Milk Fat ◽  
Desaturase Activity ◽  
Unsaturated Fatty Acids ◽  
Saturated Fatty Acids ◽  
Lactating Dairy Cows ◽  
Δ9 Desaturase

The Δ9 -desaturase system (steroyl-CoA desaturase) involves the addition of a cis double bond between carbons 9 and 10 of fatty acids. The conversion of stearic acid (C18:0) to oleic acid (cis-9 C18:1) is the predominant precursor:product of this enzyme system; conversion of saturated fatty acids (SFA) to mono-unsaturated fatty acids (MUFA) is important in determining the fluidity of milk. In previous studies (Lock & Garnsworthy 2001), we have shown that more than 50% of the oleic acid occurring in milk is produced in the mammary gland via Δ9 -desaturase. We also found that the conversion of trans-11 C18:1 to cis-9, trans-11 conjugated linoleic acid (CLA) accounted for ~80% of milk fat CLA. Increasing the activity of Δ9 -desaturase offers the opportunity of increasing the MUFA content of milk, especially oleic acid, while decreasing its SFA content, as well as increasing the CLA content of milk. Lock & Garnsworthy, (2001) also reported that there were significant differences between individual cows with regard to milk fat CLA content. In an earlier study (Lock & Garnsworthy, 2000) we found that the CLA content of milk varied throughout the year, with highest values occurring when cows received fresh pasture. In view of the significant contribution of Δ9 -desaturase to the CLA and MUFA content of milk, the objective of the work reported here was to investigate individual animal and dietary variation in Δ9 -desaturase activity in the mammary gland of lactating dairy cows.

scholarly journals Supplemental Dietary Fat from Extruded Soybeans and Calcium Soaps of Fatty Acids for Lactating Dairy Cows

1993 ◽  
Vol 76 (1) ◽  
pp. 197-204 ◽  
Author(s):  
Yong Kook Kim ◽  
David J. Schingoethe ◽  
David P. Casper ◽  
Fenton C. Ludens
Keyword(s):  
Fatty Acids ◽  
Dairy Cows ◽  
Dietary Fat ◽  
Lactating Dairy Cows

scholarly journals Influence of Dietary Fish Oil on Conjugated Linoleic Acid and Other Fatty Acids in Milk Fat from Lactating Dairy Cows

2000 ◽  
Vol 83 (11) ◽  
pp. 2620-2628 ◽  
Author(s):  
D.C. Donovan ◽  
D.J. Schingoethe ◽  
R.J. Baer ◽  
J. Ryali ◽  
A.R. Hippen ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Linoleic Acid ◽  
Fish Oil ◽  
Dairy Cows ◽  
Conjugated Linoleic Acid ◽  
Milk Fat ◽  
Lactating Dairy Cows ◽  
Dietary Fish

scholarly journals Fatty acid profile and composition of milk protein fraction in dairy cows fed long-chain unsaturated fatty acids during the transition period

2013 ◽  
Vol 42 (11) ◽  
pp. 813-823 ◽  
Author(s):  
Francisco Palma Rennó ◽  
José Esler de Freitas Júnior ◽  
Jefferson Rodrigues Gandra ◽  
Lenita Camargo Verdurico ◽  
Marcos Veiga dos Santos ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Dairy Cows ◽  
Fatty Acid Profile ◽  
Protein Fraction ◽  
Milk Protein ◽  
Unsaturated Fatty Acids ◽  
Transition Period ◽  
Long Chain

scholarly journals Daytime Grazing in Mountainous Areas Increases Unsaturated Fatty Acids and Decreases Cortisol in the Milk of Holstein Dairy Cows

Animals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 3122
Author(s):  
Jalil Ghassemi Nejad ◽  
Bae-Hun Lee ◽  
Ji-Yung Kim ◽  
Kyung-Il Sung ◽  
Hong-Gu Lee
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Dairy Cows ◽  
Milk Fat ◽  
Unsaturated Fatty Acids ◽  
Control Group ◽  
Milk Fatty Acid ◽  
Omega 3 ◽  
Mountainous Areas ◽  
Lactating Cows

The effects of grazing lactating cows in mountainous areas for 12 and 24 h compared with the confined indoor system were evaluated by examining the overall milk fatty acid and cortisol. Twenty-one dairy cows were allocated to three treatment groups: (1) control (confined management system in a free-stall barn; TMR based), (2) grazing for 12 h (12hG; TMR plus grazing pasture), and (3) grazing for 24 h (24hG; pasture-based feeding system). Dry matter intake was higher in the control and 12hG groups than in the 24hG group. The yields of total milk and the 3.5% fat-corrected milk were the lowest in the 24hG group. Milk fat was the highest in the 24hG group and higher in 12hG compared with the control group. Milk protein and lactose levels were the highest in the 12hG group. The highest somatic cell count was observed in the 24hG group. The saturated fatty acid levels were higher in the control group compared with the 12hG and 24hG groups. There was no difference in overall mono-unsaturated fatty acids between 12hG and 24hG groups. Poly-unsaturated fatty acids were higher in the 12hG group compared with the control and 24hG groups. There was no difference in omega-6 (ω-6) fatty acids among the groups, and omega-3 fatty acids were higher in the 12hG group than in the control group. Milk cortisol was the highest in the 24hG group and higher in the control group compared with the 12hG group. Taken together, grazing for 12 h is advisable for farms that have access to mountainous areas to improve the milk fatty acid profile and decrease the stress levels in high-yielding Holstein lactating cows.

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