Effect of slow-release urea inclusion in diets containing modified corn distillers grains on total tract digestibility and ruminal fermentation in feedlot cattle

O objetivo do presente experimento foi determinar os efeitos do ionóforo monensina (Rumensin ), uma fonte de uréia de liberação lenta (Anipro ) e sua associação em bovinos confinados. Foram utilizados 92 bovinos bloqueados por raça e peso e distribuídos aleatoriamente em quatro grupos: grupo controle (n=23); grupo Rumensin (n=25); grupo Anipro (n=23); e o grupo da associação de ambos (n=22). Os animais receberam dietas totais misturadas a base de silagem de milho, milho moído e caroço de algodão, contendo níveis iguais de energia (70% NDT) e proteína bruta (12%). Os dois grupos que receberam Anipro apresentaram ingestão alimentar significativamente menor do que os grupos controle e Rumensin , o que levou a ganho médio diário, peso final e peso de carcaça significativamente menores, porém sem efeito sobre conversão alimentar ou rendimento de carcaça. Não se observou qualquer efeito de Rumensin , possivelmente devido ao baixo nível de proteína bruta da dieta, ou também ao baixo nível de proteína verdadeira da dieta. Também não houve efeito significativo da interação entre os dois componentes. Monensin and slow-release urea on the performance of feedlot steers Abstract The objective of the present experiment was to determine the effects of the ionophore monensin (Rumensin ), a slow-release source of urea (Anipro ) and their association on feedlot cattle. A total of 92 steers were blocked by breed and weight and were randomly assigned to four groups: Control group (n=23); Rumensin group (n=25); Anipro group (n=23); and the association group (n=22). They received total mixed rations based on corn silage, ground corn and cottonseed, with equal levels of energy (70% TDN) and crude protein (12%). Both groups receiving Anipro showed a significantly lower feed intake, which led to significantly lower average daily gain, slaughter and carcass weight, with no effect on feed conversion and carcass yield. No effect of Rumensin was seen, possibly due to the low crude protein level of the diets, as well as the low level of true protein. There was also no significant effect on the interaction of the two components.

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Effect of Distillers Feedstuffs and Lasalocid on Campylobacter Carriage in Feedlot Cattle

Journal of Food Protection ◽

10.4315/0362-028x.jfp-14-169 ◽

2014 ◽

Vol 77 (11) ◽

pp. 1968-1975 ◽

Cited By ~ 2

Author(s):

ROBIN C. ANDERSON ◽

ROGER B. HARVEY ◽

TRYON A. WICKERSHAM ◽

JIM C. MacDONALD ◽

CHRISTIAN H. PONCE ◽

...

Keyword(s):

Amino Acid ◽

Foodborne Pathogens ◽

Basal Diet ◽

Feedlot Cattle ◽

Distillers Grains ◽

Fecal Samples ◽

Distillers Grains With Solubles ◽

Dried Distillers Grains ◽

Undegradable Intake Protein ◽

Corn Distillers

Campylobacter bacteria are foodborne pathogens that can colonize the gut of food animals. Limited in their ability to ferment sugars, Campylobacter can derive energy for growth via amino acid catabolism. The objectives of the present studies were to test whether supplemental distillers grains containing high amounts of rumen-undegradable intake protein or supplemental lasalocid may, by promoting amino acid flow to the lower bovine gut, increase intestinal carriage of Campylobacter. In study one, 10 steers (5 per treatment) were adapted to diets formulated to achieve 0 or 30% dried distillers grains. After an initial 14-day adaptation to the basal diet, control and treated steers were fed their respective diets for 23 days, after which time they were fed supplemental lasalocid for an additional 8 days, followed by a 5-day withdrawal. In study two, 24 steers preacclimated to a basal diet were adapted via 3-day periodic increases to dietary treatments formulated to achieve 0, 30, or 60% wet corn distillers grains with solubles. Analysis of Campylobacter bacteria cultured from duodenal and fecal samples in study one and from fecal samples in study two revealed no effect of dried distillers grains or wet corn distillers grains with solubles on the prevalence or concentrations of duodenal or fecal Campylobacter. The results from study one indicated that colonized steers, regardless of treatment, harbored higher Campylobacter concentrations when transitioned to the basal diet than when coming off pasture. Campylobacter carriage was unaffected by lasalocid. These results provide no evidence that feeding distillers grains high in rumen-undegradable intake protein or supplemental lasalocid contributes to increased intestinal carriage of Campylobacter in fed cattle.

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