2006
DOI: 10.1590/s1516-35982006000400024
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Abstract: RESUMO -Estudou-se a relação de fatores não-nutricionais e a concentração de nitrogênio uréico no leite (NUL), com o objetivo de contribuir para sua avaliação como indicador da eficiência de utilização de dietas para vacas leiteiras. Foram utilizadas 7.006 observações provenientes de 855 vacas da raça Holandesa, incluindo dados coletados no dia da amostragem de leite referentes à produção de leite, ao peso vivo, ao número de dias em lactação (DEL) e ao número de lactações (NL). Nas amostras de leite coletadas … Show more

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Cited by 8 publications
(42 citation statements)
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References 27 publications
(42 reference statements)
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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%
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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%
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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%
“…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%