Comparison of predictions of digestible supply
and measurements of net portal fluxes of essential
amino acids in lactating dairy cows

Whole soybean has 40-42 percent CP and used as high energy-protein supplement for early lactation dairy cows. However, the protein is highly degradable, so small amounts of amino acids can be reached to small intestine to meet high amino acid requirements of early lactating cows. Therefore, various chemical and physical treatments have been suggested to decrease ruminal protein degradability of soybeans. The practical use and application of any one method to lower ruminal feed degradability is dependent not only on its efficacy but also on its cost effectiveness, safety and ease of application. For these reasons, heat treatment is the most commonly used physical method (Plegge et al., 1985). The purpose of this study was to determine how roasting of soybeans affect plasma essential amino acid concentrations in early lactation cows.

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

Journal of the Science of Food and Agriculture ◽

10.1002/(sici)1097-0010(199708)74:4<459::aid-jsfa855>3.0.co;2-s ◽

1997 ◽

Vol 74 (4) ◽

pp. 459-468 ◽

Cited By ~ 27

Author(s):

Harri O Miettinen ◽

Pekka J Huhtanen

Keyword(s):

Amino Acids ◽

Dairy Cows ◽

Plasma Amino Acids ◽

Energy Metabolites ◽

Lactating Dairy Cows ◽

Silage Fermentation

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

Reproduction ◽

10.1530/rep-08-0391 ◽

2009 ◽

Vol 138 (5) ◽

pp. 771-781 ◽

Cited By ~ 51

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.

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