Impact of non nutritional factors on milk urea concentration and its relationship with production and fertility traits in Vojvodina dairy herds

Čobanović, Ksenija; Kučević, Denis; Plavšić, Miroslav; Bogdanović, Vladan

doi:10.15567/mljekarstvo.2017.0404

Cited by 7 publications

(7 citation statements)

References 9 publications

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“…The average MU in each of the first 3 lactations ranged from 24.80 to 26.19 mg/dL, which were similar to those reported by Bastin et al (2009) for the first-parity average MU (25.51 mg/dL) of dairy cows in Walloon. These values were also consistent with those reported in previous studies (Čobanović et al, 2017;Lopez-Villalobos et al, 2018;Ariyarathne et al, 2019). However, Satoła et al (2017b) reported a lower value for MU in Polish Holstein-Friesian cows.…”

Section: Descriptive Statisticssupporting

confidence: 93%

“…The MU varies between individuals and is affected by many factors. Literature reported among others, the factors feed compositions (Correa-Luna et al, 2019), milking time (Bendelja et al, 2011), age at calving (Wood et al, 2003), stage of lactation and season of milking (Fatehi et al, 2012;Yin et al, 2012), herd and parity (Čobanović et al, 2017;Siatka et al, 2020), and genetics (Bendelja et al, 2011;Mucha and Strandberg, 2011;Rzewuska and Strabel, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Genetic analysis of milk urea concentration and its genetic relationship with selected traits of interest in dairy cows

Chen

Atashi

Vanderick

et al. 2021

Journal of Dairy Science

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The aim of this study was to estimate genetic parameters of milk urea concentration (MU) and its genetic correlations with milk production traits, longevity, and functional traits in the first 3 parities in dairy cows. The edited data set consisted in 9,107,349 MU testday records from the first 3 parities of 560,739 cows in 2,356 herds collected during the years 1994 to 2020. To estimate the genetic parameters of MU, data of 109 randomly selected herds, with a total of 770,016 MU test-day records, were used. Genetic parameters and estimated breeding values were estimated using a multiple-trait (parity) random regression model. Herdtest-day, age-year-season of calving, and days in milk classes (every 5 d as a class) were used as fixed effects, whereas effects of herd-year of calving, permanent environment, and animal were modeled using random regressions and Legendre polynomials of order 2. The average daily heritability and repeatability of MU during days in milk 5 to 365 in the first 3 parities were 0.19, 0.22, 0.20, and 0.48, 0.48, 0.47, respectively. The mean genetic correlation estimated among MU in the first 3 parities ranged from 0.96 to 0.97. The average daily estimated breeding values for MU of the selected bulls (n = 1,900) ranged from −9.09 to 7.37 mg/dL. In the last 10 yr, the genetic trend of MU has gradually increased. The genetic correlation between MU and 11 traits of interest ranged from -0.28 (milk yield) to 0.28 (somatic cell score). The findings of this study can be used as the first step for development of a routine genetic evaluation for MU and its inclusion into the genetic selection program in the Walloon Region of Belgium.

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Section: Descriptive Statisticssupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Genetic analysis of milk urea concentration and its genetic relationship with selected traits of interest in dairy cows

Chen

Atashi

Vanderick

et al. 2021

Journal of Dairy Science

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“…As a result, deamination of amino acid and urea formation in the liver are reduced [7]. While some studies [10,16] reported that MU was lower in primiparous cows, other studies [9,14,15] found the highest MU concentration in primiparous cows and the lowest in multiparous cows.…”

Section: Discussionmentioning

confidence: 99%

“…Urea as a part of the non-protein fraction of nitrogen in milk represents the final product of protein metabolism in the rumen of ruminants [9]. In dairy cows, urea can be found as a component in blood, milk, saliva and urine.…”

Section: Introductionmentioning

confidence: 99%

Effect of Parity and Days in Milk on Milk Urea Concentration and Milk Components in Holstein Dairy Cows

2022

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The objective of this study was to assess the effects of parity and of days in milk (DIM) on milk urea (MU) and other milk components in Holstein dairy cows. Milk yield was lower (P < 0.05) in primiparous cows compared with multiparous cows and tended to increase until the third parity and then decrease. The MU concentration was lower (P < 0.05) at the first lactation than at the other lactations. Milk fat and protein contents were higher (P < 0.05) in the primiparous cows than that in multiparous cows and were reduced until the third parity and then increased. Lower (P < 0.05) milk lactose content was found in primiparous cows and tended to increase until the third parity and then decreased. Primiparous cows had lower (P < 0.05) daily protein and fat yields compared with multiparous cows. The lowest value of milk yield was recorded during the first lactation with a peak of lactation between 61—90 DIM and a persistence of lactation of 3 %. The highest milk yield was confirmed at the third and fourth lactations with a peak of lactation between 61—90 DIM and a persistence of lactation of 7 % and 6 %. The effect of DIM on MU confirmed a significant (P < 0.01) positive relationships in primiparous and multiparous cows. The lowest level of MU concentration was found between 0—30 DIM. The content of MU increased and the maximum was achieved between 271—305 DIM. It is suggested that although MU for nutritional management and measures of production or reproduction are used, non-nutritional factors should be considered.

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“…Modern diets for highly productive cow are based on a high level of concentrated feed (up to 65% by nutritional value) that often causes disturbances in protein metabolism, which leads to lower indicators of productivity, reproduction, health, and premature culling of animals. It was found that the concentration of urea in blood and milk could be an indicator of these changes [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Variability and correlation of milk urea content with parameters of cow productivity

2021

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During the work, 24774 individual milk samples for Ayrshire cows (Karelia, Russia) with an annual milk yield of over 8.300 kg were tested (1.355 cows) every month for the last three years. The urea content averaged 32.19 mg% with a daily yield of 25.5 kg. In cows at the age of the first two lactations, the urea content was higher than for adult animals. The urea content in milk increased from 31.46 mg% to 33.56% with increasing daily yield. In summer and early autumn, urea concentration was lower than in spring and winter. A reliable positive correlation of milk urea was obtained with daily yield, lactose, negative – with protein, dry milk matter, dry non-fat milk residue, the number of somatic cells, and lack of connection was with fat and the freezing temperature of milk. The bull's genotype has a significant effect on the amount of milk urea. Heritability coefficient (h2) was in the range of 0.222 - 0.367.

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Impact of non nutritional factors on milk urea concentration and its relationship with production and fertility traits in Vojvodina dairy herds

Cited by 7 publications

References 9 publications

Genetic analysis of milk urea concentration and its genetic relationship with selected traits of interest in dairy cows

Genetic analysis of milk urea concentration and its genetic relationship with selected traits of interest in dairy cows

Effect of Parity and Days in Milk on Milk Urea Concentration and Milk Components in Holstein Dairy Cows

Variability and correlation of milk urea content with parameters of cow productivity

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