Effect of feeding pasture-finished cattle different conserved forages on Escherichia coli in the rumen and faeces

Jacobson, Laura H.; Nagle, T.; Gregory, N.; Bell, Robert G.; Roux, Guillaume Le; Haines, Joanne M

doi:10.1016/s0309-1740(01)00233-9

Cited by 31 publications

(16 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This in turn suggests that any protection of proteins in red clover silage brought about by PPO activity is likely to have been lost once the digesta reached the duodenum. Although Jacobson et al (2002) observed differences among various bacterial groups, their work was done principally with dried forages (hays). The reduction in fecal E. coli populations when animals were fed red clover hay was not replicated in this study with red clover silage.…”

Section: Fecal Bacterial Populationsmentioning

confidence: 99%

“…Certain plant secondary compounds, including several coumarins, are known to inhibit the growth of E. coli O157 when incubated in rumen fluid (Duncan et al, 1998). Red clover contains high concentrations of plant secondary compounds, and although it is best known for its isoflavanoid content, red clover hay has been shown to reduce the amount of E. coli in cattle rumen contents (Jacobson et al, 2002). Feeding different conserved forages also had effects on fecal bacteria counts (Jacobson et al, 2002), and it was hypothesized that changing red clover silage to grass silage may alter the fecal bacterial population, including E. coli O157 counts.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of dietary ratios of red clover and grass silages on milk production and milk quality in dairy cows

Moorby

Lee

Davies

et al. 2009

Journal of Dairy Science

View full text Add to dashboard Cite

Twenty-four multiparous Holstein-Friesian dairy cows were used in a replicated 4 × 4 Latin square changeover design experiment to test the effects of changing from ryegrass (Lolium perenne) silage to red clover (Trifolium pratense) silage in graded proportions on feed intakes, milk production, milk organoleptic qualities, and whole-body nitrogen partitioning. Four dietary treatments, comprising ad libitum access to 1 of 4 forage mixtures plus a standard allowance of 4 kg/d dairy concentrates, were offered. The 4 forage mixtures were, on a dry matter (DM) basis: 1) 100% grass silage, 2) 66% grass silage: 34% red clover silage, 3) 34% grass silage: 66% red clover silage, and 4) 100% red clover silage. In each of 4 experimental periods, there were 21 d for adaptation to diets and 7 d for measurements. There was an increase in both DM intakes and milk yields as the proportion of red clover in the diet increased. However, the increase in milk yield was not as great as the increase in DM intake, so that the efficiency of milk production, in terms of yield (kg) of milk per kg of DM intake, decreased. The concentrations of protein, milk fat, and the shorter chain saturated fatty acids decreased, whereas C18 polyunsaturated fatty acids (PUFA) and long-chain PUFA (C20+) increased as the proportion of red clover in the diet increased. There was little effect of dietary treatment on the organoleptic qualities of milk as assessed by taste panel analysis. There were no effects on the aroma of milk, on aftertaste, or overall liking of the milk. Milk was thicker and creamier in color when cows were fed grass silage compared with red clover silage. The flavor of milk was largely unaffected by dietary treatment. In conclusion, increasing the proportion of red clover in the diet of dairy cows increased feed intakes and milk yields, decreased the concentration of fat and protein in milk, increased PUFA for healthiness, and had little effect on milk organoleptic characteristics.

show abstract

Section: Fecal Bacterial Populationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of dietary ratios of red clover and grass silages on milk production and milk quality in dairy cows

Moorby

Lee

Davies

et al. 2009

Journal of Dairy Science

View full text Add to dashboard Cite

show abstract

“…Further studies on the effects of different pre-slaughter diets on the shedding of E. coli have verified earlier experimental fasting observations (Brownlie & Grau, 1967;Grau et al, 1968) and extended and used these to evaluate strategies to minimise bacterial build up and reduce the spreading of faeces in preslaughter cattle (Cray, Casey, Bosworth, & Rasmussen, 1998;Gregory, Jacobson, Nagle, Muirehead, & Le Roux, 2000;Jacobson et al, 2002). Gregory et al (2000) found that fasting of pasturefed cattle for 24 h followed by 2 h of transport and 16 h lairage significantly increased rumen and faecal E. coli at slaughter by 2e3 log cfu/g, and concentrations in the faeces were related to those in the rumen.…”

Section: Introductionmentioning

confidence: 64%

Review of the impact of pre-slaughter feed curfews of cattle, sheep and goats on food safety and carcase hygiene in Australia

Pointon

Kiermeier

Fegan³

2012

Food Control

View full text Add to dashboard Cite

“…were detected in manure from cows in pasture, which may be attributed to several factors. For example, the neutral detergent fiber (Hao et al 2005;Jacobson et al 2002) and acid detergent fiber (Jacobson et al 2002) content of animal feed is correlated to manure pH to some extent, suggesting that cows grazing on certain types of grass pasture excrete feces with a pH below the growth optimum for certain bacteria, including Bacteroides spp. It is also important to keep in mind that Bacteroides spp.…”

Section: Discussionmentioning

confidence: 99%

Storage conditions and animal source influence the dominant bacterial community composition in animal manure

Arthurson

2011

World J Microbiol Biotechnol

View full text Add to dashboard Cite

The aim of this study was to determine the impact of storage, animal diet, and animal source on the bacterial community composition of manure. The differences among bacterial community structures in fresh manure from cows on two different diets, cow manure stored in a deep pit for about one month, and fresh pig manure were compared. A molecular approach consisting of terminal restriction fragment length polymorphism (T-RFLP), in combination with sequence information from clone libraries, facilitated the identification of specific dominant bacterial populations that varied significantly among manures from different sources and treatments. One such population, represented by TRF 157, the most dominant peak of the bacterial community from stored manure, was identified as a Spirochaeta sp. Interestingly, this peak was absent in the fresh manure communities. The prevailing species in the fresh manure bacterial communities were distinct from those in manure from the storage pit, indicating a major shift in bacterial community composition induced by storage conditions. Moreover, distinct differences in bacterial communities were observed among animal source, but not animal feed. Manure storage is consequently an important parameter to consider when handling fertilizers, in order to obtain an optimal soil microbial ecosystem functioning.

show abstract

Effect of feeding pasture-finished cattle different conserved forages on Escherichia coli in the rumen and faeces

Cited by 31 publications

References 16 publications

Assessment of dietary ratios of red clover and grass silages on milk production and milk quality in dairy cows

Assessment of dietary ratios of red clover and grass silages on milk production and milk quality in dairy cows

Review of the impact of pre-slaughter feed curfews of cattle, sheep and goats on food safety and carcase hygiene in Australia

Storage conditions and animal source influence the dominant bacterial community composition in animal manure

Contact Info

Product

Resources

About