Fatores não-nutricionais e concentração de nitrogênio uréico no leite de vacas da raça Holandesa

Meyer, Paula Marques; Machado, Paulo Fernando; Coldebella, Arlei; Cassoli, Laerte Dagher; Coelho, Karyne Oliveira; Rodrigues, Paulo Henrique Mazza

doi:10.1590/s1516-35982006000400024

Cited by 9 publications

(16 citation statements)

References 27 publications

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“…Animals have an average daily milk yield of 32.4±11.5 kg/day and fat and protein percentages of 3.40±0.73% and 3.13±0.35%, respectively. These results are similar to those found by Rajala-Schultz & Saville (2003) and Meyer et al (2006). The general means for age at calving and days in milk were 45.8±21.8 months and 205±141 days, respectively.…”

Section: Resultssupporting

confidence: 91%

“…The linear correlation between MUN and milk yield was moderate and positive (r = 0.34; P<0.01), similarly to the results found by Joknker et al (1998) and Meyer et al (2006), confirming that higher-producing groups and herds can present higher MUN values. Therefore, the milk production covariable was included in the model, being an important source of variation (P<0.01) in milk urea.…”

Section: Resultssupporting

confidence: 88%

“…The average concentration of milk urea nitrogen was 14.45±4.60 mg/dL (Table 1), a value slightly above the maximum limit suggested for this parameter (between 10 and 14 mg/dL), and consistent with several review studies Jonker et al, 1998;Rajala-Schultz & Saville, 2003;Johnson & Young, 2003;Meyer et al, 2006;Cordeiro et al, 2007).…”

Section: Resultssupporting

confidence: 88%

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Sources of variation in milk urea nitrogen in Paraná dairy cows

Doska¹,

Silva²,

Horst³

et al. 2012

R. Bras. Zootec.

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-The present study was conducted to determine the relationship between milk urea nitrogen (MUN) and milk yield, fat and protein contents, breed and season effects, parity and days in milk in dairy cows from Paraná State, Brazil. collected during the winter were higher than those collected in the other seasons. The effects of the lactation stage on MUN were significant, with the highest MUN values observed in the sixth month of lactation. High-producing dairy cows showed higher milk urea concentrations but several environmental factors may contribute to reduce this important parameter of diet utilization efficiency.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 88%

See 1 more Smart Citation

Sources of variation in milk urea nitrogen in Paraná dairy cows

Doska¹,

Silva²,

Horst³

et al. 2012

R. Bras. Zootec.

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“…Therefore, it should infer that milk production varies as a function of the variable lactose. These results differ from those reported by Meyer et al (2006), who affirmed the levels of lactose to be highly correlated to milk production.…”

Section: Resultscontrasting

confidence: 99%

Procedure for collecting milk sample and the number of milkings in relation to chemical composition and somatic cells of the fresh milk

Jakeline¹,

Marco²,

Thiago³

et al. 2015

Afr. J. Agric. Res.

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This study was carried out to determine which system of milkings and sampling methodology presenting chemical composition results safer and lower variation of the results. In Properties I and II, the fresh milk samples were collected in 40 ml flasks containing bronopol in order to compare the chemical composition of the milk, as adopting two sample collection methods, that is two and three milkings. In order to compare the chemical composition of milk and SCC, between two sampling methodologies, in two daily milkings (Property I) and three daily milkings (Property II), fresh milk samples were collected randomly totaling 300 samples on the property I and 312 samples on the property II. The milk chemical components were determined through analytical principle that is based on differential absorption of infrared waves by components of the milk. By analyzing the treatments, experimental design was used entirely randomized and averages were compared by Tukey test using the statistical program SISVAR (statistical analysis system). When evaluating the data obtained through variation coefficient (VC), the occurrence of experimental was observed, since most results showed low variation. However the distinct procedures for sampling of the fresh milk may present varied levels of the chemical composition and SCC, therefore overestimating or underestimating the values of the milk composition, when samples are collected at different times of the day and different number of milkings.

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“…Milk urea nitrogen was found at an average of 15.67 mg/dL for production of 13.9 kg milk/day, which is above the value found by Lucci et al (2006) of 14.15 mg/dL for the treatment that completely met the requirements of crude protein, but the production was 12.4 kg milk/day. The MUN value calculated by the equation suggested by Meyer et al (2006) is 11.0 mg/dL (MUN = 9.52 + 0.1054 × MP; r 2 = 0.65), well below the actual value found in this study, thus rendering the equation in this system unreliable. The SCC was used to monitor the occurrence of subclinical mastitis in the cows studied, which could influence milk production and composition.…”

Section: Resultscontrasting

confidence: 77%

Crude glycerin in supplement to primiparous lactating cows grazing on tropical pasture: nutritional and productive characteristics

et al. 2013

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-The objective of this study was to evaluate the nutritional and productive characteristics of primiparous lactating cows grazing on tropical pasture, using different levels of crude glycerin in the supplement. The experiment was conducted at Rancho Santana farm, located in Jequié city, Bahia, Brazil, in the period from December 21, 2010 to March 16, 2011. Ten ¾ Holstein × ¼ Dairy Gyr lactating primiparous cows, with 109±24 days of lactation and a mean age of 30±6 months and mean body weight of 426.2±68.29 kg were distributed into five treatments, using two simultaneous 5 × 5 latin squares. Treatments consisted of inclusion levels (0, 94, 191, 289, 389 g/kg dry matter basis) of crude glycerin in the supplement. Intake, digestibility, milk production and composition were measured. Results were statistically analyzed by analysis of variance and regression at 0.05 probability. For all consumption variables no significant differences were found between the levels of crude glycerin. Except for the digestibility of ether extract, all digestibility values were similar between treatments. The fat content and yield showed quadratic effect between treatments. No significant differences were observed for protein, lactose, total solids, nonfat dry extract, fat:protein ratio, milk urea nitrogen and somatic cell count between treatments. For primiparous lactating cows grazing on tropical pasture, up to 389 g of crude glycerin/kg of dietary supplement can be included without nutritional and productive interference.

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Fatores não-nutricionais e concentração de nitrogênio uréico no leite de vacas da raça Holandesa

Cited by 9 publications

References 27 publications

Sources of variation in milk urea nitrogen in Paraná dairy cows

Sources of variation in milk urea nitrogen in Paraná dairy cows

Procedure for collecting milk sample and the number of milkings in relation to chemical composition and somatic cells of the fresh milk

Crude glycerin in supplement to primiparous lactating cows grazing on tropical pasture: nutritional and productive characteristics

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