Association between blood plasma urea nitrogen levels and reproductive fluid urea nitrogen and ammonia concentrations in early lactation dairy cows

The concentration of blood plasma urea nitrogen (BUN) was measured at bi-weekly intervals in four groups of growing Lincoln and Southdown lambs which received the same ration throughout their growth period. BUN increased with age and weight in each group. Although all groups showed similar changes in BUN with age, BUN concentration increased at 0.73 × 10−2, 0.88 × 10−2, 0.91 × 10−2, and 1.23 × 10−2 mg per kg of body weight gained in the case of Lincoln males, Lincoln females, Southdown males, and Southdown females, respectively. The average rates of gain for these groups were 0.33, 0.28, 0.26 and 0.20 kg per day, respectively. It appeared from these studies that at any given weight, the more mature animals at that weight tended to have higher BUN concentrations and a higher rate of increase of BUN with weight.

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Detrimental effects of high plasma urea nitrogen levels on viability of embryos from lactating dairy cows

Animal Reproduction Science ◽

10.1016/j.anireprosci.2005.02.009 ◽

2006 ◽

Vol 91 (1-2) ◽

pp. 1-10 ◽

Cited By ~ 62

Author(s):

M.L. Rhoads ◽

R.P. Rhoads ◽

R.O. Gilbert ◽

R. Toole ◽

W.R. Butler

Keyword(s):

Dairy Cows ◽

High Plasma ◽

Urea Nitrogen ◽

Plasma Urea ◽

Nitrogen Levels ◽

Lactating Dairy Cows

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Morphological Quality of Oocytes and Blood Plasma Metabolites in Repeat Breeding and Early Lactation Dairy Cows

Reproduction in Domestic Animals ◽

10.1111/j.1439-0531.2010.01652.x ◽

2011 ◽

Vol 46 (2) ◽

pp. 253-260 ◽

Cited By ~ 9

Author(s):

J Kurykin ◽

A Waldmann ◽

T Tiirats ◽

T Kaart ◽

Ü Jaakma

Keyword(s):

Blood Plasma ◽

Dairy Cows ◽

Plasma Metabolites ◽

Early Lactation

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The effect of non-nutritional factors on milk urea nitrogen levels in dairy cows in Prince Edward Island, Canada

Preventive Veterinary Medicine ◽

10.1016/s0167-5877(03)00061-8 ◽

2003 ◽

Vol 59 (1-2) ◽

pp. 83-93 ◽

Cited By ~ 20

Author(s):

P Arunvipas ◽

I.R Dohoo ◽

J.A VanLeeuwen ◽

G.P Keefe

Keyword(s):

Dairy Cows ◽

Prince Edward Island ◽

Urea Nitrogen ◽

Nutritional Factors ◽

Nitrogen Levels ◽

Milk Urea ◽

Milk Urea Nitrogen

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Corn supplementation on milk urea nitrogen content of dairy cows grazing on temperate annual pasture

Ciência Rural ◽

10.1590/0103-8478cr20190077 ◽

2020 ◽

Vol 50 (2) ◽

Cited By ~ 1

Author(s):

Aline Cristina Dall-Orsoletta ◽

João Gabriel Rossini Almeida ◽

Márcia Maria Oziemblowski ◽

Henrique Mendonça Nunes Ribeiro-Filho

Keyword(s):

Dairy Cows ◽

Protein Production ◽

Milk Protein ◽

Live Weight ◽

Corn Silage ◽

Utilization Efficiency ◽

Urea Nitrogen ◽

Plasma Urea ◽

Lactation Stage ◽

Milk Urea

ABSTRACT: The excretion of urinary nitrogen (N), one of the most important environmental contaminants from livestock systems, is highly correlated with milk urea N content. The objective of this research was to evaluate the use of different types of corn supplementation on milk urea N in grazing dairy cows. Twelve Holstein × Jersey lactating dairy cows were divided into six uniform groups according to milk production, lactation stage and live weight. Treatments were compared according to a 3 × 3 replicated Latin square experimental design, with three periods of seventeen days (twelve days to adaptation and five to measurements). The experimental treatments were exclusively grazing (G); grazing + supplementation with 4.2 kg DM of corn silage (CS) and grazing + supplementation with 3.2 kg DM of ground corn (GC). The pasture used was annual ryegrass (Lolium multiflorum L.) and white oats (Avena sativa L.). The milk protein production increased 65 g/day in the GC treatment group compared to the G and CS groups. The supplemented dairy cows showed lower milk urea N (-2.8 mg/dL) than unsupplemented cows, but the N utilization efficiency (g N output in milk/ g N intake) did not change between treatments (average = 0.26). Additionally, there was a relationship between milk and plasma urea nitrogen concentrations (R2 = 0.64). In conclusion, for dairy cows grazing annual temperate pastures, corn ground supplementation increased milk protein production and reduced the excretion of milk urea N, whereas corn silage reduced the excretion of milk urea N without affecting milk protein production.

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Impact of High Rumen Undegraded Protein (HRUP) Supplementation to Blood Urea Nitrogen and Reproduction Performance in Early Lactation Dairy Cows

International Journal of Dairy Science ◽

10.3923/ijds.2016.28.34 ◽

2015 ◽

Vol 11 (1) ◽

pp. 28-34 ◽

Cited By ~ 1

Author(s):

Rochijan . ◽

Budi Prasetyo Widyobroto ◽

Ismaya .

Keyword(s):

Dairy Cows ◽

Blood Urea Nitrogen ◽

Early Lactation ◽

Urea Nitrogen ◽

Reproduction Performance

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Amino and urea nitrogen levels in lambs receiving different nitrogen sources and injections of lysine and methionine

Canadian Journal of Physiology and Pharmacology ◽

10.1139/y69-152 ◽

1969 ◽

Vol 47 (11) ◽

pp. 929-934 ◽

Cited By ~ 2

Author(s):

D. G. Ely ◽

C. O. Little ◽

G. E. Mitchell Jr.

Keyword(s):

Amino Acid ◽

Amino Nitrogen ◽

Nitrogen Sources ◽

Total Amino Acid ◽

Urea Nitrogen ◽

Plasma Urea ◽

Nitrogen Levels ◽

Dietary Nitrogen ◽

Tissue Protein Synthesis ◽

Time Of Feeding

Two trials were conducted to study changes in plasma urea and amino nitrogen of lambs fed different nitrogen sources. In the first trial, zein, zein and urea, or urea were fed as the only dietary nitrogen sources. Nitrogen balance data indicated the superiority of the zein–urea ration. Plasma amino acid concentrations were lower at 4 h after feeding than just before feeding. The concentration of total plasma amino acids was greatest when zein was fed and least when the zein–urea ration was fed. Lysine injections into the systemic blood caused a steady decline in total amino acid concentration up to 60 min after injection when zein was fed. Increases in total concentrations were noted after injection when urea had been fed. Intermediate values resulted in lambs fed the zein–urea ration. Lysine appeared to be the limiting amino acid required for maximum tissue protein synthesis when zein was fed. In the second trial, zein, purified soy protein, urea plus sulfur, and urea without sulfur were fed. Plasma collected from lambs fed zein contained less urea nitrogen at every collection period than those fed the other three nitrogen sources. Urea nitrogen decreased from time of feeding to 4 h after feeding zein and soy but increased after feeding both urea rations. Plasma amino nitrogen decreased from time of feeding to 4 h after feeding all rations. Neither urea nitrogen nor amino nitrogen was affected by intravenous amino acid injections.

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