Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/15103
Tipo: Artigo
Título: Levels of multiple supplements or nitrogen salt for beef heifers in pasture during the dry season
Autor(es): Valente, Ériton Egidio Lisboa
Paulino, Mário Fonseca
Detmann, Edenio
Valadares Filho, Sebastião de Campos
Barros, Lívia Vieira de
Acedo, Tiago Sabella
Couto, Victor Rezende Moreira
Lopes, Sidnei Antonio
Abstract: The study assessed performance, microbial protein synthesis, intake and digestibility of nutrients by beef heifers receiving levels of multiple supplements or nitrogen salt, in a self-controlled intake, on pasture, during the dry season. Thirty-five beef heifers, from 6 to 9 months of age and average initial body weight of 203.4 + 4.5 kg, were used. Study factors were: control – mineral mixture; nitrogen salt – 50% of urea + mineral mixture, at proportion of 1:1, and 50% of corn (75% of crude protein); levels of multiple supplementation – multiple supplements with different percentages of intake controller mixture (urea + mineral mixture, at the proportion of 1:1), corn and soybean meal (45% of crude protein). Supplement consumptions observed were: 115, 173, 572 and 1214 g/animal/day for animals fed on nitrogen salt, low, medium and high levels of multiple supplement, respectively. Supplemented animals had greater average daily gain, evidencing the positive linear effect of the levels of multiple supplementation on average daily gain. Overall, there were no significant differences between average daily gain of animals fed on multiple supplements or nitrogen salt. Supplementation increased the intake and digestibility of nutrients, except for digestibility of neutral detergent fiber, although the intake of digested neutral detergent fiber increased. Supplementation increased the production of microbial nitrogen as well as nitrogen losses in urine, although the quantity of nitrogen assimilated by bacteria, proportionally to intake, was higher. Supplementation improves nutritional parameters and weight gain.
Palavras-chave: Digestibility
Intake
Performance
Self-control
Editor: Revista Brasileira de Zootecnia
Tipo de Acesso: Open Access
URI: http://dx.doi.org/10.1590/S1516-35982011000900024
http://www.locus.ufv.br/handle/123456789/15103
Data do documento: 15-Fev-2011
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