Effects of a slow-release coated urea product on growth performance and ruminal fermentation in beef steers

Abstract

The objective of this study was to evaluate the effects of a slow-release coated urea product (CU, 1% as dry matter of diet) on ruminal disappearance and fermentation, as well as on growth performance of beef steers. Soybean meal in control diet was replaced by CU and steam-rolled corn. For the growth performance trial, 20 beef steers (330&plusmn;20 kg) were used. For the ruminal trial, four ruminally cannulated steers (230&plusmn;20 kg) were used. Dry matter intake, daily gain, feed efficiency and carcass dressing were not affected (P> 0.05) by CU. Ruminal ammonia N was higher (P<0.05) with CU than control diet. Potential disappearance and total ruminal disappearance of dry matter were increased, while the potential disappearance rate of neutral detergent fibre was reduced with CU. Slow coated urea at 1% of total diet did not affect growth performance and carcass dressing of beef steers

Effects of a combining feed grade urea and a slow-release product on performance, dietary energetics and carcass characteristics of steers fed finishing diets

“…Similar to previous reports (Pinos-Rodríguez et al 2010;Holland & Jennings 2011), there were no effects of U combination on carcass characteristics. As the S:ADF ratio increased, carcass weight and LM area were increased linearly.…”

“…U combination did not affect (P = 0.96) ADG, but tended to reduce DMI (5.1%, P = 0.06), and reduced DMI expressed as a percentage of live weight (5.8%, P = 0.02). In a few studies, the absence of effects on feed intake of the combination of U plus SRU products has been observed previously in steers fed a finishing diet (Tedeschi et al 2002;Pinos-Rodríguez et al 2010;Castañeda-Serrano et al 2013). However, a tendency for reduction in DMI has been observed in steers fed diets containing 2.25% of a solution of SRU product based on calcium bond U (Duff et al 2000).…”

“…In contrast, other studies (Tedeschi et al 2002;PinosRodríguez et al 2010) showed that SRU supplementation to finishing steers did not have positive effects on neither gain nor feed efficiency. The estimated S:ADF ratio of the experimental diets of studies conducted by Tedeschi et al (2002) and by Pinos-Rodríguez et al (2010) was over 5.4; thus, the high S:ADF ratios of the diets used in those studies could be a factor in the absence of effects on the performance and feed efficiency of steers fed a combination of U and SRU.…”

Utilização de ureia encapsulada de liberação lenta na alimentação de vacas em lactação

“…Uma solução alternativa para a utilização da ureia na alimentação animal seria modificar sua taxa de liberação de N, fazendo com que fosse retardada, tornando-se mais sincronizada com a digestão dos carboidratos (PINOS-RODRÍGUEZ et al, 2010).…”

“…Não foram encontradas diferenças no pH, na produção total e proporção molar dos ácidos graxos voláteis. (HUNTINGTON et al, 2006;GOLOMESKI et al, 2006;TAYLOR-EDWARDS et al, 2009;HIGHSTREET et al, 2010;INOSTROZA et al, 2010;PINOS-RODRÍGUEZ et al, 2010;XIN et al, 2010). No entanto, as concentrações de N-NH 3 nos tratamento com ureia de liberação lenta e com proteína isolada de soja continuou declinando.…”