Effect of supplementary concentrate type on nitrogen partitioning in early lactation dairy cows offered perennial ryegrass-based pasture.
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TL;DR: Dietary reformulation to reduce N excretion in pasture-based dairy production systems is possible, however, maintenance of milk yield and milk N when concentrate CP was reduced required the use of either protected AA (HMBi) or ground corn.
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About: This article is published in Journal of Dairy Science. The article was published on 01 Aug 2012. and is currently open access.
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Citations
Methane production, digestion, ruminal fermentation, nitrogen balance, and milk production of cows fed corn silage- or barley silage-based diets.
TL;DR: Increase in the CS proportion in the diet improved N utilization, as reflected by decreases in ruminal ammonia concentration and urinary N excretion and higher use of dietary N for milk protein secretion.
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Effects of concentrate crude protein content on nutrient digestibility, energy utilization, and methane emissions in lactating dairy cows fed fresh-cut perennial grass
TL;DR: The present findings indicate that reducing concentrate CP content from 18.1 to 14.1% may not be a successful way of alleviating CH4 emissions from lactating dairy cows offered good-quality fresh grass, but grazing cows could be offered a low-CP concentrate without compromising energy utilization efficiency.
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Effects of crude protein level in concentrate supplements on animal performance and nitrogen utilization of lactating dairy cows fed fresh-cut perennial grass
TL;DR: The present study indicated that when grazing cows are fed good-quality pasture, feeding concentrates with a protein content as low as 14.1% may not negatively affect productivity and reducing concentrate CP concentration may be successful in reducing the urinary N excretion of lactating dairy cattle on pasture-based systems.
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A comparison of serum metabolic and production profiles of dairy cows that maintained or lost body condition 15 days before calving.
TL;DR: This work shows that BCS loss before calving may have significant consequences for metabolic status, milk composition, somatic cell score, and BCS profile in dairy cows.
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The effect of dietary crude protein and phosphorus on grass-fed dairy cow production, nutrient status, and milk heat stability.
M. Reid,M. Reid,Michael O'Donovan,Christopher T. Elliott,J. S. Bailey,Cathy J. Watson,Stan Lalor,B. Corrigan,Mark A. Fenelon,Eva Lewis +9 more
TL;DR: The findings show that increasing dietary CP caused a decrease in milk heat stability, which reduced the suitability of milk for processing, and increasing dietary P increased fecal P excretion.
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References
Effects of Dietary Crude Protein Concentration and Degradability on Milk Production Responses of Early, Mid, and Late Lactation Dairy Cows
TL;DR: Because there was no effect of diet on milk production, decreasing CP in diets fed to cows in mid or late lactation can reduce the cost of the diet and waste N excreted from the cow.
104
Lactation and Metabolic Responses to Graded Abomasal Doses of Methionine and Lysine in Cows Fed Grass Silage Diets
TL;DR: The data demonstrate that Met is important in the milk fat synthesis, and Lys isImportant in mammary gland AA metabolism, however, neither Met nor Lys is the first-limiting AA in the Milk protein yield of cows fed a grass silage and cereal diet.
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The effect of energy supplementation on nitrogen utilization in lactating dairy cows fed grass silage diets.
Alejandro Castillo,E. Kebreab,D. E. Beever,J H T Barbi,John Sutton,H C Kirby,J. France +6 more
TL;DR: The efficiency of nitrogen utilization in lactating dairy cows fed grass silage diets is low, rarely exceeding 0.30 g milk N/g of dietary N intake. Feeding corn-based concentrates and low degradable starch diets improves nitrogen utilization and milk protein content.
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Preferential flow, nitrogen transformations and 15N balance under urine-affected areas of irrigated and non-irrigated clover-based pastures
TL;DR: The results of the four experiments showed that within a day of urine application up to 40% of the applied urinary-N was leached below a depth of 150 mm as a result of macropore flow in the irrigated paddock, and up to 24% in the non-irrigated one as mentioned in this paper.
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Effect of pasture allowance and supplementation with maize silage and concentrates differing in crude protein concentration on milk production and nitrogen excretion by dairy cows
Farkhunda Burke,Farkhunda Burke,M.A. O’Donovan,John J. Murphy,Frank P. O'Mara,Finbar Mulligan +5 more
TL;DR: In this paper, the effect of pasture allowance and supplements of a) maize silage b) high crude protein concentrate and, c) low crude protein concentrates on milk production and nitrogen excretion was evaluated.
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