Productivity, requirements and efficiency of feed and nitrogen utilization of grass-fed early lactating cows exposed to high Alpine conditions

Nitrogen utilization was studied when eight lactating cows were offered ad libitum urea-treated corn silage (15.3% crude protein) or grass silage (14.5% crude protein), plus a grain ration at 1 kg grain to 3.5 kg of 4% fat-corrected milk, in a digestion and nitrogen (N) balance trial. Analyses of the forages indicated greater acid detergent fiber content for the grass than for the corn silage: 46.8 and 35.1% on a dry matter basis, respectively. Digestibility of dry matter, energy, crude protein, true protein, acid detergent fiber, neutral detergent fiber, and N balance were significantly greater (P < 0.05) for cows fed urea–corn silage than for those fed grass silage. The nitrogen of urea–corn silage was used more efficiently for milk and tissue protein synthesis. Decreased nitrogen utilization for cows fed grass silage was associated with lower energy and higher acid detergent fiber content for grass silage than for urea–corn silage.

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Effects of the Pattern of Energy Supply on the Efficiency of Nitrogen Utilization for Microbial Protein Synthesis in the Non-Lactating Cows Consuming Grass Silage

Asian-Australasian Journal of Animal Sciences ◽

10.5713/ajas.2000.962 ◽

2000 ◽

Vol 13 (7) ◽

pp. 962-966 ◽

Cited By ~ 6

Author(s):

K. H. Kim ◽

S. S. Lee ◽

B. T. Jeon ◽

C. W. Kang

Keyword(s):

Protein Synthesis ◽

Energy Supply ◽

Nitrogen Utilization ◽

Microbial Protein ◽

Microbial Protein Synthesis ◽

Grass Silage ◽

Lactating Cows

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Degradability of Feed Protein–Important Factor in Nitrogen Utilization and Milk Productivity of Lactating Cows

10.1007/978-3-030-91405-9_130 ◽

2021 ◽

pp. 1153-1159

Author(s):

Oksana Shlyakhova ◽

Sergey Mashtalenko ◽

Abuelkassem Tantawi ◽

Nina Komarova

Keyword(s):

Nitrogen Utilization ◽

Milk Productivity ◽

Lactating Cows ◽

Feed Protein

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Effects of Concentrate on Barley Silage and Nitrogen Utilization by Lactating Cows Fed Large Amounts of Urea

Journal of Dairy Science ◽

10.3168/jds.s0022-0302(70)86440-2 ◽

1970 ◽

Vol 53 (11) ◽

pp. 1584-1586 ◽

Cited By ~ 2

Author(s):

C.E. Polan ◽

P.T. Chandler ◽

R.A. Sandy

Keyword(s):

Nitrogen Utilization ◽

Lactating Cows ◽

Barley Silage

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Milk production from silage and concentrates containing varying proportions of dried grass and cereals

Animal Science ◽

10.1017/s0003356100035169 ◽

1975 ◽

Vol 20 (2) ◽

pp. 173-179 ◽

Cited By ~ 4

Author(s):

F. J. Gordon

Keyword(s):

Organic Matter ◽

Milk Production ◽

Dry Matter ◽

Milk Composition ◽

Nitrogen Utilization ◽

Grass Silage ◽

Lactating Cows ◽

Body Retention ◽

Ad Libitum ◽

Groundnut Meal

SummaryTwenty-eight lactating cows were used in an experiment of changeover design with four periods to evaluate concentrates containing 0, 16, 32, 49, 65, 81 and 97% dried grass. The dry matter of the dried grass was 63% digestible. The concentrates also contained barley, together with groundnut meal to equalize their protein content at approximately 16-5% of dry matter. All animals had grass silage ad libitum and all concentrates were given at the rate of 0·4 kg/kg milk. Milk yield, milk composition and liveweight change were not affected by including dried grass in the concentrate. No significant effect of concentrate on silage intake was obtained. Ration digestibility and nitrogen utilization were measured with four animals per treatment. The digestibility of dry matter, organic matter and nitrogen was not reduced by increasing the proportion of dried grass in the concentrate. The efficiency of utilization of apparently digested nitrogen for total productive purposes (body retention and milk nitrogen) was also not affected by the proportion of dried grass.

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