Supplementation with non-fibrous carbohydrates reduced fiber digestibility and did not improve microbial protein synthesis in sheep fed fresh forage of two nutritive values

Tebot, I.; Cajarville, Cecilia; Repetto, José Luis; Cirio, A.

doi:10.1017/s1751731111002011

Cited by 14 publications

(9 citation statements)

References 33 publications

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“…Nitrogen (N) compounds of temperate pastures are extensively and rapidly degraded in the rumen (Repetto et al 2005;Fulkerson et al 2007), releasing high amounts of NH 3 to the ruminal environment Cajarville & Pérez et al 2006) that can be utilised by the microbiota. However, the quantity of readily fermentable carbohydrates is often insufficient, leading to low N utilisation and poor animal performance (Elizalde et al 1996;García et al 2000;Tebot et al 2012). This inadequacy is even greater during autumn and early winter, as day length and luminosity are lower, and fewer water-soluble carbohydrates (WSC) are produced by the plants in comparison with late winter and spring (Delagarde et al 2000).…”

Section: Introductionmentioning

confidence: 99%

Diurnal changes in water-soluble carbohydrate concentration in lucerne and tall fescue in autumn and the effects on in vitro fermentation

Cajarville

Britos

Errandonea

et al. 2015

New Zealand Journal of Agricultural Research

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The aim of the experiment was to study diurnal variation in water-soluble carbohydrate (WSC) concentrations in leaf and stem of tall fescue and lucerne in autumn and to determine the impact of these changes on the rate and the extent of in vitro fermentation. Vegetative herbage of lucerne and tall fescue were sampled at 0900, 1300 and 1700 h, following three consecutive regrowths between April and May. Whole plants, leaf and stem were analysed for chemical composition and in vitro gas production. There was a linear increase in WSC throughout the day for all plants and plant components (P < 0.001). In both fescue and lucerne, this rise resulted in an increased rate of gas production, although this relationship was more pronounced in fescue. Use of time of day to govern grazing management decisions to potentially improve the rumen supply of WSC and nitrogen in autumn can be achieved from tall fescue or lucerne pastures.

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Section: Introductionmentioning

confidence: 99%

Diurnal changes in water-soluble carbohydrate concentration in lucerne and tall fescue in autumn and the effects on in vitro fermentation

Cajarville

Britos

Errandonea

et al. 2015

New Zealand Journal of Agricultural Research

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“…This is comparable to the results reported in other studies. For example, Tebot et al. (2012) reported the SD of pasture (90% oat [ Avena sativa ] and 10% white clover [ Trifolium repens ]) DM content was 17 g/kg for pasture cut in the early vegetative stage and 31 g/kg for pasture cut in the late vegetative stage of the harvest season.…”

Section: Discussionmentioning

confidence: 99%

Sheep numbers required for dry matter digestibility evaluations when fed fresh perennial ryegrass or forage rape

et al. 2017

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Research trials with fresh forages often require accurate and precise measurement of digestibility and variation in digestion between individuals, and the duration of measurement periods needs to be established to ensure reliable data are obtained. The variation is likely to be greater when freshly harvested feeds are given, such as perennial ryegrass (Lolium perenne L.) and forage rape (Brassica napus L.), because the nutrient composition changes over time and in response to weather conditions. Daily feed intake and faeces output data from a digestibility trial with these forages were used to calculate the effects of differing lengths of the measurement period and differing numbers of sheep, on the precision of digestibility, with a view towards development of a protocol. Sixteen lambs aged 8 months and weighing 33 kg at the commencement of the trial were fed either perennial ryegrass or forage rape (8/treatment group) over 2 periods with 35 d between measurements. They had been acclimatised to the diets, having grazed them for 42 d prior to 11 days of indoor measurements. The sheep numbers required for a digestibility trial with different combinations of acclimatisation and measurement period lengths were subsequently calculated for 3 levels of imposed precision upon the estimate of mean dry matter (DM) digestibility. It is recommended that if the standard error of the mean for digestibility is equal to or higher than 5 g/kg DM, and if sheep are already used to a fresh perennial ryegrass or forage rape diet, then a minimum of 6 animals are needed and 4 acclimatisation days being fed individually in metabolic crates followed by 7 days of measurement.

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“…The results of these studies supported the hypothesis that there are benefits on microbial protein synthesis in synchronizing the availability of rumen-fermentable carbohydrates with N in the rumen, but this is not always associated with significant changes in rumen pH and NH 3 -N concentrations. Meanwhile, Tebot et al [43] evaluated three forage diets with non-fibrous carbohydrate supplementation (100% fresh temperate forage, 70% forage + 30 barley grain, and 70% forage + 15% barley + 15% molasses-based product). The results indicated that supplementation with starch (barley) or sugars (molasses) in sheep grazing did not improve ruminal N-ammonia captured for microbial protein synthesis.…”

Section: Digestion Of Temperate Forages Plus Other Feedstuffsmentioning

confidence: 99%

Lamb Fattening Under Intensive Pasture-Based Systems: A Review

Fernandez-Turren

Repetto

Arroyo

et al. 2020

Animals

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The benefits of pasture-based systems on the fatty acid composition of sheep meat appear to be achievable despite variability in the quality of the pastures. Lambs fed high levels of temperate pastures have an excess of N-ammonia derived from protein degradation. Furthermore, animal performance is highly variable depending on the quality of the pasture at the time of grazing, and high animal performance in these systems appears to be linked to the use of high-quality pastures with high availability, and is possibly added to by the inclusion of concentrates that allow increasing energy intake and a better use of the N in the pasture. The combination of high-quality pastures and total mixed ration offers a good alternative to the inclusion of concentrates in the diet, improving the use of N, and avoiding acidosis problems. However, information to determine the effect of a number of nutritional strategies on meat quality, and the minimum level of pasture intake necessary to achieve the benefits of pastoral systems is still lacking.

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Supplementation with non-fibrous carbohydrates reduced fiber digestibility and did not improve microbial protein synthesis in sheep fed fresh forage of two nutritive values

Cited by 14 publications

References 33 publications

Diurnal changes in water-soluble carbohydrate concentration in lucerne and tall fescue in autumn and the effects on in vitro fermentation

Diurnal changes in water-soluble carbohydrate concentration in lucerne and tall fescue in autumn and the effects on in vitro fermentation

Sheep numbers required for dry matter digestibility evaluations when fed fresh perennial ryegrass or forage rape

Lamb Fattening Under Intensive Pasture-Based Systems: A Review

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