scholarly journals Study on feeding effect of dietary protein sources of on blood or milk urea nitrogen in native cows

2016 ◽  
Vol 19 (1-2) ◽  
pp. 85-96
Author(s):  
NR Sarker ◽  
KS Huque ◽  
M Asaduzzaman
Keyword(s):  
Milk Protein ◽  
Control Diet ◽  
Basal Diet ◽  
Fat Content ◽  
Urea Nitrogen ◽  
Treatment Groups ◽  
Milk Urea ◽  
Feed Protein ◽  
Morning Milk ◽  
Milk Urea Nitrogen

A feeding trial with 30 Pabna milking cows of 2 to 4 parities dividing equally into 5 groups was conducted to determine the effect of feeding protein from different sources on blood or milk urea nitrogen, and milk yield or protein content in native cows. Considering a group of cows fed a diet of rice straw and concentrate as the control (T0), two out of the rests were fed either with urea-molasses straw (UMS) (T1) or Matikalai (Vigna mungo) hay ( T2) as sources of basal roughage. The rest two groups of cows were fed the control diet replacing percent (%) of feed protein by the amount of urea and molasses fed to UMS group. The amount of urea and molasses was fed daily either in two meals (T3) or fed to cows mixing with other concentrate feed (T4). Feeding a basal diet of UMS, DS or leguminous hay did not affect milk protein (%) and daily milk production Feeding urea and molasses in meals or mix (T3 and T4) did not affect significantly (p>0.05) BSU and MUN contents. It indicates that feeding urea and molasses in two meals in a day either as a single mix of the two or as a mix of the two with concentrates significantly (p>0.05) reduced the concentration of BSU or MUN without having any change in milk protein (%) of the cows. Dry matter (DM) intake was significantly (p<0.05) higher in T1 treatment group followed by T4, T0, T3 and T2, respectively. Similarly, CP intake was significantly (p<0.05) higher in T1 and T2 treatment groups followed by T3 and T4 treatment groups. The values of CP intake were 490, 770, 760, 630 and 580 g/day for treatment groups T0, T1, T2, T3, and T4, respectively. Feedings urea and molasses as meals (T3) significantly (p<0.05) reduced the fat content in milk compared with other treatment groups. Similar to T3, UMS feeding also significantly (p<0.05) reduced fat content in milk compared to Matikalai hay and T4 treatment groups. Milk urea nitrogen (MUN) content in morning milk was lower compared to evening milk. These data showed that feeding urea or protein of organic sources had effect on BSU and MUN contents in the morning milk but had no significant effect on evening milk. The lower BSU or MUN content in milk of the cows fed urea and molasses either in daily meals or as mix with concentrates may be due mainly to a lower CP intake compared to UMS and Matikalai. Therefore, it may be concluded that feeding urea or organic protein had no significant effect on milk protein percent.Bangladesh J. of Livestock Res. 19(1-2): 85-96, Jan-Dec 2012

Milk urea-nitrogen negatively affected first-service breeding success in commercial dairy cows in Prince Edward Island, Canada

2007 ◽  
Vol 82 (1-2) ◽  
pp. 42-50 ◽  
Author(s):  
P. Arunvipas ◽  
J.A. VanLeeuwen ◽  
I.R. Dohoo ◽  
E.R. Leger ◽  
G.P. Keefe ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Breeding Success ◽  
Prince Edward Island ◽  
Urea Nitrogen ◽  
Milk Urea ◽  
Milk Urea Nitrogen

319 Predicting Urinary Nitrogen Excretion from Milk Urea Nitrogen of Fresh Forage or Total Mixed Ration Fed Dairy Cows: A Meta-analysis

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 171-171
Author(s):  
Matthew R Beck ◽  
Cameron Marshall ◽  
Konagh Garrett ◽  
Andrew P Foote ◽  
Ronaldo Vibart ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Meta Analysis ◽  
Live Weight ◽  
Predictive Ability ◽  
Nitrogen Excretion ◽  
Good Precision ◽  
Urea Nitrogen ◽  
Total Mixed Ration ◽  
Milk Urea ◽  
Milk Urea Nitrogen

Abstract Urine nitrogen excretion (g/d; UN) represent a significant environmental impact for both confinement feeding and pastoral based dairy systems. It is difficult to measure UN directly due to animal handling and labor requirements, especially in forage based production systems. The currently available milk urea nitrogen (MUN) equations have been shown to overestimate UN excretion of grazing dairy cows compared with an equation using urinary creatinine and UN concentration, indicating that diet may alter the relationship between MUN and UN. This potential was explored using data retrieved (treatment means: n = 69 and 27 for fresh forage [FF] and total mixed ration [TMR] fed cattle, respectively) from the literature and new data obtained from dairy cows fed FF (n = 15) in metabolism crates was used to test the new equations. The TMR data from literature was further split into a training set (to develop the model; n = 53) and a test set (to validate the model; n = 16). There was an interaction for diet type (P &lt; 0.01) where UN (g/d) = 0.023 × MUN (mg/dL) × live-weight (kg, LW) for TMR fed cattle, (similar to a pre-established equation); however, UN (g/d) = 0.015 × MUN × LW for FF fed cattle. For FF based equations, the New MUN equation and the creatinine equation showed good precision and accuracy (Lin’s CCC = 0.79 and 0.74, respectively) and adequate predictive ability (RMSEP = 29.8 and 35.9, respectively). The new MUN equation for TMR fed cattle showed excellent accuracy and precision (Lin’s CCC = 0.87) with good predictive ability (RMSEP = 24.3) for UN excretion (observed mean = 216.5 g/d). The new equations generated during this meta-analysis provide promising predictive ability of UN excretion, which can be used for management considerations, future research, and policy making.

scholarly journals Milk Urea Nitrogen and Infertility in Florida Holstein Cows

2000 ◽  
Vol 83 (3) ◽  
pp. 459-463 ◽  
Author(s):  
P. Melendez ◽  
A. Donovan ◽  
J. Hernandez
Keyword(s):  
Holstein Cows ◽  
Urea Nitrogen ◽  
Milk Urea ◽  
Milk Urea Nitrogen

scholarly journals The chemical composition and technological properties of milk obtained from the morning and evening milking

2008 ◽  
Vol 56 (5) ◽  
pp. 187-198 ◽  
Author(s):  
Martin Skýpala ◽  
Gustav Chládek
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Protein Production ◽  
Milk Protein ◽  
Fat Content ◽  
Total Solids ◽  
Milk Protein Content ◽  
Solids Content ◽  
Morning Milk

Milk yield varies during lactation, following what is termed a lactation curve. ŽIŽLAVSKÝ and MIKŠÍK (1988) recorded changes in milk yield within a day, too. TEPLÝ et al. (1979) a KOUŘIMSKÁ et al. (2007) published variation within a day ± 1.10 kg in milk yield, ± 0.75 % in milk fat content and ± 0.20 % in milk protein content. Milk yield of cows can be expressed in many different ways, for instance, in kilograms per lactation or in kilograms per day. A practical parameter describing milk production is milk yield (kg) per milking.The object of experiment were 12 cows of Holstein cattle on the first lactation from the 100-day of lactation to 200-day of lactation. The samples of milk were collected from January to May 2007, once a month from the morning and evening milking (milking interval 12 h ± 15 min.). The following parameters were monitored: milk production – milk yield (kg), milk protein production (kg), milk fat production (kg); milk composition – milk protein content (%), milk fat content (%), lactose content (%), milk solids-not-fat content (%), milk total solids content (%); technological properties of milk – ti­tra­tab­le acidity (SH), active acidity (pH), rennet coagulation time (s), quality of curd (class) and somatic cell count as a parameter of udder health.Highly significant differences were found (P < 0.01) between morning milk yield (15.7 kg) and evening milk yield (13.8 kg), between morning milk protein production (0.51 kg) and evening milk protein production (0.45 kg) and between evening milk fat content (4.41 %) and morning milk fat content (3.95 %). A significant difference (P < 0.05) was found between morning milk total solids content (12.62 %) and evening milk total solids content (12.07 %). No significant differences were found between morning (M) and evening (E) values of the remaining parameters: milk fat production (M 0.62 kg; E 0.60 kg), milk protein content (M 3.24 %; E 3.27 %), milk lactose content (M 4.78 %; E 4.86 %), milk solids-not-fat content (M 7.69 %; E 7.71 %), somatic cell count (M 80 000/1 mL; E 101 000/1 mL), titratable aci­di­ty (M 7.75 SH; E 7.64 SH), active acidity (M pH 6.58; E pH 6.61), rennet coagulation time (M 189 s.; E 191 s.), quality of curd (M 1.60 class; E 1.57 class).

Do Milk Samples Stored for 12 Days after Collection Exhibit a Change in Composition Related to the Initial Bacterial Load?

2016 ◽  
Vol 79 (5) ◽  
pp. 816-820
Author(s):  
LARISSA NAZARETH de FREITAS ◽  
LAERTE DAGHER CASSOLI ◽  
JANIELEN da SILVA ◽  
JOSÉ CARLOS de FIGUEIREDO PANTOJA ◽  
PAULO FERNANDO MACHADO
Keyword(s):  
Room Temperature ◽  
Storage Time ◽  
Bacterial Load ◽  
Total Bacterial Count ◽  
Urea Nitrogen ◽  
Total Solids ◽  
Milk Samples ◽  
Milk Urea ◽  
The Impact ◽  
Milk Urea Nitrogen

ABSTRACT Total bacterial count (TBC) is a tool used to assess milk quality and is associated with not only the initial sample contamination but also the sample storage time and temperature. Several countries have reported milk samples with a high TBC, and the influence of TBC on milk preservation remains unclear. Thus, the aim of this study was to evaluate the impact of the initial bacterial contamination level on the macrocomponents and somatic cell count (SCC) of raw milk samples preserved with bronopol and maintained at two storage temperatures (7 and 25°C) for up to 12 days. Thus, we collected milk samples from 51 dairy farms, which were divided into two groups according to the initial bacterial load: low TBC (&lt;100,000 CFU/ml) and high TBC (≥100,000 CFU/ml). We analyzed the sample composition for protein, fat, total solids, lactose, milk urea nitrogen, and the SCC. We did not observe an effect from TBC and storage time and temperature on the concentration of protein, fat, total solids, and lactose. SCC changes were not observed for samples maintained under refrigeration (7°C); however, samples maintained at room temperature (25°C) exhibited a decrease in the SCC beginning on day 6 of storage. For milk urea nitrogen, values increased when the samples were maintained at room temperature, beginning on the ninth storage day. Samples with the preservative bronopol added and maintained under refrigeration may be analyzed up to 12 days after collection, regardless of the milk microbial load.

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