2003
DOI: 10.1590/s1516-35982003000300025
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Abstract: RESUMO -O objetivo desse trabalho foi avaliar a substituição parcial do farelo de soja por nitrogênio não protéico no desempenho de vacas holandesas em lactação. Oito animais com 90 dias de lactação e 600 kg de peso vivo, no início do experimento, foram distribuídos em dois quadrados latinos (4X4). A uréia representou 0,0; 0,8; 1,54; e 2,40% da matéria seca (MS) da dieta, correspondente a 2,32; 4,65; 6,66; e 8,02% de proteína bruta (PB) na forma de compostos nitrogenados-não-protéicos (NNP), que representaram … Show more

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Cited by 29 publications
(30 citation statements)
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“…The PUN value in this study was, however, smaller than values observed in studies in which intake reduced as UAs were increased (from 19.90 to 23.08 mg/dL) (Silva et al 2001a,b;Oliveira et al, 2001;Oliveira et al, 2004). The lower PUN value observed in the present study in relation to those of Silva et al (2001a,b), Melo et al (2003) and Oliveira et al (2004) is possibly related to the nature of the dietary carbohydrates present in the sugarcane, which are mostly soluble in neutral detergent, especially those rich in sugars, of higher rumen degradation rate in relation to the amylaceous fractions, and the ones insoluble in neutral detergent, which are typical in silages of corn and sorghum (Lanzas et al, 2007). A higher rumen degradation rate of the fraction of sugars propitiates greater synchrony with the rate of rumen ammonia availability through urea, allowing for lower accumulation of rumen ammonia (Nocek & Russell, 1988).…”
Section: Resultscontrasting
confidence: 80%
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“…The PUN value in this study was, however, smaller than values observed in studies in which intake reduced as UAs were increased (from 19.90 to 23.08 mg/dL) (Silva et al 2001a,b;Oliveira et al, 2001;Oliveira et al, 2004). The lower PUN value observed in the present study in relation to those of Silva et al (2001a,b), Melo et al (2003) and Oliveira et al (2004) is possibly related to the nature of the dietary carbohydrates present in the sugarcane, which are mostly soluble in neutral detergent, especially those rich in sugars, of higher rumen degradation rate in relation to the amylaceous fractions, and the ones insoluble in neutral detergent, which are typical in silages of corn and sorghum (Lanzas et al, 2007). A higher rumen degradation rate of the fraction of sugars propitiates greater synchrony with the rate of rumen ammonia availability through urea, allowing for lower accumulation of rumen ammonia (Nocek & Russell, 1988).…”
Section: Resultscontrasting
confidence: 80%
“…This result is consistent with Rangel et al (2008), who, utilizing the same levels of urea in the sugarcane, but with a lower roughage:concentrate ratio in relation to the present study, also did not observe effect on the performance of dairy cows with production above 20 kg/day. However, it is not in line with other researchers, who observed linear decrease in the milk yield of cows fed increasing levels of urea (up to 21 to 24 g/kg DM of the diet), but utilizing corn or sorghum silage or a mixture of corn silage and forage cactus as exclusive source of forage (Silva et al, 2001a;Melo et al, 2003;Oliveira et al, 2004).…”
Section: Resultscontrasting
confidence: 77%
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