Effects of Silage Fermentation and Post-ruminal Casein Supplementation in Lactating Dairy Cows: 2—Energy Metabolites and Plasma Amino Acids

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.

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Effect of post-ruminal infusion of glutamine on plasma amino acids, milk yield and composition in lactating dairy cows

Canadian Journal of Animal Science ◽

10.4141/a00-073 ◽

2001 ◽

Vol 81 (2) ◽

pp. 229-235 ◽

Cited By ~ 13

Author(s):

J. C. Plaizier ◽

J. -P. Walton ◽

B. W. McBride

Keyword(s):

Amino Acids ◽

Amino Acid ◽

Blood Plasma ◽

Dairy Cows ◽

Milk Yield ◽

Dry Matter ◽

Milk Composition ◽

Plasma Amino Acid ◽

Dry Matter Intake ◽

Plasma Amino Acids

The objectives of this study were to examine the effect of supplying post-ruminal L-glutamine in mid-lactation Holstein dairy cows on plasma amino acid profile, dry matter intake, milk yield and milk composition. The experiment was designed as a 4 × 4 Latin square with four 2-wk periods. Cows were continuously infused post-ruminally with graded levels of L-glutamine (L-Gln) for 5 consecutive days during the second week of each period. During the last 24 h of the infusion, blood plasma was collected every 6 h for the determination of plasma amino acid concentrations. Plasma Gln concentration increased (P < 0.05) with increasing L-Gln daily infusions. Infusion of 0, 100, 200, and 300 g d–1 resulted in blood plasma Gln concentrations of 289.5, 299.2, 356.4 and 386.2 mmol L–1, respectively. The level of Gln infusion also resulted in a decrease in the blood plasma concentration of phenylalanine, but the concentrations of all other amino acids were not affected. The administration of Gln did not affect dry matter intake, milk yield and milk composition. Key words: Post-ruminal, L-glutamine, plasma amino acids, milk constituents

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Adequacy of Amino Acids in Diets Fed to Lactating Dairy Cows

Journal of Dairy Science ◽

10.3168/jds.s0022-0302(97)76103-4 ◽

1997 ◽

Vol 80 (8) ◽

pp. 1713-1721 ◽

Cited By ~ 10

Author(s):

Z. Wu ◽

C.E. Polan ◽

R.J. Fisher

Keyword(s):

Amino Acids ◽

Dairy Cows ◽

Lactating Dairy Cows

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Response of Lactating Dairy Cows to Abomasal Infusion of Amino Acids

Journal of Dairy Science ◽

10.3168/jds.s0022-0302(76)84354-8 ◽

1976 ◽

Vol 59 (7) ◽

pp. 1254-1270 ◽

Cited By ~ 220

Author(s):

C.G. Schwab ◽

L.D. Satter ◽

A.B. Clay

Keyword(s):

Amino Acids ◽

Dairy Cows ◽

Lactating Dairy Cows ◽

Abomasal Infusion

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In vitro and Lactation Responses in Mid-lactating Dairy Cows Fed Protected Amino Acids and Fat

Asian-Australasian Journal of Animal Sciences ◽

10.5713/ajas.2014.14089 ◽

2014 ◽

Vol 27 (12) ◽

pp. 1705-1711 ◽

Cited By ~ 1

Author(s):

I. S. Nam ◽

J. H. Choi ◽

K. M. Seo ◽

J. H. Ahn

Keyword(s):

Amino Acids ◽

Dairy Cows ◽

Lactating Dairy Cows

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Effects of Ensilage and Silage Fermentation Pattern on the Intake and Performance of Lactating Dairy Cows

Proceedings of the British Society of Animal Production (1972) ◽

10.1017/s0308229600025563 ◽

1994 ◽

Vol 1994 ◽

pp. 2-2

Author(s):

A Cushnahan ◽

C S Mayne

Keyword(s):

Dairy Cows ◽

Once Daily ◽

Lactating Dairy Cows ◽

Silage Fermentation ◽

Lower Protein ◽

Fermentation Pattern ◽

Per Se ◽

Cow Performance ◽

And Performance ◽

Forage Harvester

It is generally acknowledged that lactating dairy cows offered grass silage consume less dry matter (DM) and produce less milk with a lower protein concentration than cows offered fresh pasture. However, there is little evidence to indicate whether these effects are due to the influence of ensiling per se or to differences in herbage composition. The aims of the current experiment were to evaluate the effects of ensiling per se and silage fermentation pattern on forage intake and dairy cow performance.A perennial ryegrass sward (Lolium perenne cvs Barlenna and Talbot) was divided into 4 areas (A, B, C and D) comprising one area of 6.7 ha (area A) and three areas of 0.7 ha (areas B, C and D). Each area received a total of 361 kg N, 74 kg P2O5 and 144 kg K2O/ha over the season. From 1 June 1993, herbage was harvested once daily from areas B, C and D using a double chop forage harvester and offered to dairy cows housed indoors during weeks 1, 2 and 3 respectively (Treatment G).

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