Comparative effects of multiple sources of rumen-protected methionine on milk production and serum amino acid levels in mid-lactation dairy cows

2017 ◽  
Vol 33 (6) ◽  
pp. 692-699 ◽  
Author(s):  
Y. Zang ◽  
S. Saed Samii ◽  
Z.C. Phipps ◽  
L.R. Tager ◽  
J.W. McFadden ◽  
...  
Keyword(s):  
Amino Acid ◽  
Dairy Cows ◽  
Milk Production ◽  
Multiple Sources ◽  
Amino Acid Levels

1594 Comparative effects of multiple sources of rumen-protected methionine on milk production and serum amino acid levels in midlactation dairy cows

2016 ◽  
Vol 94 (suppl_5) ◽  
pp. 775-775
Author(s):  
Y. Zang ◽  
S. Saed Samii ◽  
L. R. Tager ◽  
J. W. McFadden ◽  
K. M. Krause
Keyword(s):  
Amino Acid ◽  
Dairy Cows ◽  
Milk Production ◽  
Multiple Sources ◽  
Amino Acid Levels

Response of lactating dairy cows to dietary protein from canola meal or distillers’ grains on dry matter intake, milk production, milk composition, and amino acid status

2015 ◽  
Vol 95 (2) ◽  
pp. 267-279 ◽  
Author(s):  
I. P. Acharya ◽  
D. J. Schingoethe ◽  
K. F. Kalscheur ◽  
D. P. Casper
Keyword(s):  
Amino Acid ◽  
Dairy Cows ◽  
Milk Production ◽  
Dietary Protein ◽  
Dry Matter ◽  
Milk Composition ◽  
Distillers Grains ◽  
Dry Matter Intake ◽  
Canola Meal ◽  
Acid Status

Acharya I. P., Schingoethe D. J., Kalscheur K. F. and Casper D. P. 2015. Response of lactating dairy cows to dietary protein from canola meal or distillers’ grains on dry matter intake, milk production, milk composition, and amino acid status. Can. J. Anim. Sci. 95: 267–279. A study was conducted to determine the response of feeding two different crude protein (CP) concentrations [low protein (LP, 14.3% CP) and high protein (HP, 16.3% CP)] and sources of protein [canola meal (CM) and high-protein dried distillers’ grains (HPDDG)] on dry matter intake, milk production and composition, and amino acid (AA) status of high producing dairy cows. Sixteen Holstein cows were used in a replicated 4×4 Latin square having a 2×2 factorial arrangement of treatments. All diets contained 55% forage (50% alfalfa hay and 50% corn silage) and 45% concentrate. Diets were formulated to contain LP with CM, LP with HPDDG, HP with CM and HP with HPDDG. Experimental feeding periods were 4 wk with data collected during weeks 3 and 4 of each period. Dry matter intake (24.6 vs. 25.9 kg d−1 for LP and HP, respectively) was increased for cows fed the higher CP diets, milk yield was greater for cows fed HP diets (34.0 vs. 36.4 kg d−1), and milk fat percentage was greater for cows fed HP compared with LP, but were similar between dietary protein sources. Feed efficiency calculated as fat-corrected milk and energy-corrected milk was greater for cows fed HP than LP, but was similar between sources. Dietary metabolizable protein of CM diets was utilized more efficiently than from HPDDG diets for milk protein production. Mammary gland extraction efficiency of essential AA indicated that Met was the first limiting AA for CM-based diets while Lys was first limiting for HPDDG-based diets. In summary, canola meal and distillers’ grains are both good quality protein supplements for lactating cows.

Ruminal and intestinal protein disappearance of some tropical (Iranian) feeds used in dairy cow diets estimated by the mobile nylon bag technique

2003 ◽  
Vol 2003 ◽  
pp. 118-118
Author(s):  
M. Danesh Mesgaran
Keyword(s):  
Amino Acid ◽  
Dairy Cows ◽  
Milk Production ◽  
Dairy Cow ◽  
Dietary Protein ◽  
Dry Matter ◽  
Intestinal Protein ◽  
Amino Acid Requirements ◽  
Digestible Protein ◽  
Feed Protein

In Iran milk production, in dairy cows, is based mainly on intensive systems in which cereals and industrial by-product are the most important source of nutrients. So, high digestible protein feeds are often desired for supplementation of high producing dairy cows to meet their amino acid requirements. Incubation of feeds in nylon bags in the rumen of fistulated ruminants have been used to evaluate the extent of digestion. In addition, the mobile bag technique has been used to measure intestinal digestibility of undegraded dietary protein and intact feed protein (Mesgaran, 2002). The work described in this summary assessed the digestibility of dry matter and protein, using ruminal and intestinal mobile nylon bag technique, of some tropical (Iranian) feeds used in dairy cow diets.

Glutamine is a potentially limiting amino acid for milk production in dairy cows: A hypothesis

Metabolism ◽  
1993 ◽  
Vol 42 (3) ◽  
pp. 358-364 ◽  
Author(s):  
Gerwin A.L. Meijer ◽  
Jan van der Meulen ◽  
Ad M. van Vuuren
Keyword(s):  
Amino Acid ◽  
Dairy Cows ◽  
Milk Production ◽  
Limiting Amino Acid
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