Increased intake responses from beef steers zero-grazed on <i>Lolium perenne</i> selected for high levels of water soluble carbohydrate

Lee, M.R.F.; Evans, R.T.; Moorby, J. M.; Humphreys, M. W.; Theodorou, Michael K.; MacRae, J.C.; Scollan, ND

doi:10.1017/s1752756200004683

Cited by 2 publications

(2 citation statements)

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“…Water-soluble carbohydrate concentration of pasture grasses is considered an important grazing factor because it increases the amount of readily available carbohydrate, so affecting the efficiency of conversion of nitrogen to microbial protein in the rumen. Miller et al (2001) have reported enhanced milk production and quality in dairy cows and increased live weight gains have been reported in sheep (Lee et al 2000) and in cattle (Lee et al 2001). These studies, however, were based on only two varieties with high and low WSC, which may also have differed in other characteristics in addition to WSC.…”

Section: Nutritive Valuementioning

confidence: 99%

Canopy morphology and nutritional quality traits as potential grazing value indicators for Lolium perenne varieties

Barrett²,

et al. 2002

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Twelve perennial ryegrass (Lolium perenne L.) varieties of different ploidy and maturity classifications were compared under a frequent cutting management in their second harvest year, equivalent to the simulated rotational grazing system employed in UK testing protocols. Varietal differences in canopy structure (proportion of lamina, green leaf mass, sward surface height, extended tiller height, bulk density) and in herbage nutritive value factors (water-soluble carbohydrate content and proportion of linoleic and α-linolenic fatty acids) were assessed and their importance evaluated with reference to total herbage production. Significant variety variation (P<0·001) was recorded in the annual means of all the canopy structure characteristics. Significant differences associated with ploidy were also recorded, with tetraploid varieties having significantly higher values than diploids in most plant characters, indicating better intake characteristics for these grasses. Temporal patterns of variation associated with maturity were also observed in several characters, thus making it impossible to designate a single assessment that would be representative of the annual ranking of varieties. Water-soluble carbohydrate concentration differed significantly (P<0·001) between varieties and although the tetraploids tended to have high contents, the highest value of all was recorded in a diploid variety, which had been selectively bred for this trait. The varieties did not differ in total lipid content but there were significant differences in the proportion of linoleic acid between varieties (P<0·001) while the proportion of α-linolenic acid differed between varieties (P<0·001), ploidy (P<0·001) and maturity (P<0·05) classes.Overall evaluation of the extensive variety variation highlighted the need for better quantification of animal responses to differences of these magnitudes, before the high workload of including them in routine variety testing protocols could be justified. Potential for breeding improvement in these factors was also indicated and the future prospects for their use in farmer decision support systems was considered.

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Section: Nutritive Valuementioning

confidence: 99%

Canopy morphology and nutritional quality traits as potential grazing value indicators for Lolium perenne varieties

Barrett²,

et al. 2002

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“…Limited breeding progress in the nutritive value of perennial ryegrass has been achieved in recent decades compared to other crops. One of these breeding advances affecting ruminant nutrition has been the introduction of high-sugar genotypes [8,23,24]. It is therefore very important to identify accession-related differences in the nutritional value of perennial ryegrass.…”

Section: Introductionmentioning

confidence: 99%

Protein and Carbohydrate Fractionation to Evaluate Perennial Ryegrass (Lolium perenne L.) Accessions

Gierus,

Salama,

Lösche

et al. 2024

Agronomy

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Precise information about carbohydrates and proteins in relation to their utilization in the rumen is useful for the breeding purposes of perennial ryegrass cultivars used for animal nutrition. The objective of the current study was to evaluate 20 diploid perennial ryegrass accessions from the intermediary heading stage. The ruminal kinetics of different carbohydrate and protein fractions of grasses and legumes are important for forage breeding programs. The Cornell Net Carbohydrate and Protein System (CNCPS) was used to provide such information. Accession-based variation can be observed after considering dynamic degradation processes. Variation among the 20 accessions was observed. Ruminally digested (RDC) and undigested (UDC) carbohydrate and ruminally degraded (RDP) and undegraded (UDP) protein contents, total carbohydrate and total protein contents, and carbohydrate and protein fractions for the first cut and annual averages show significant differences. Although the variation was smaller for the protein fractions, the calculated usable protein content (uCP, sum of UDP and amount of synthesized microbial protein in the rumen) in the small intestine is mainly influenced by decreasing the neutral detergent fiber (NDF) and increasing the sugar content among cultivars. Carbohydrate and protein fractionation is suitable for characterizing perennial grass accessions as it uses parameters relevant to ruminant nutrition, allowing a step forward in forage plant breeding for forage quality. To conclude, using parameters related to ruminal degradation kinetics should favor the selection of accessions with higher amounts of ruminally digested carbohydrates (RDC). The selection of accessions based on protein quality (proportion of UDP) is less favorable for achieving a higher usable protein content.

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Increased intake responses from beef steers zero-grazed on Lolium perenne selected for high levels of water soluble carbohydrate

Cited by 2 publications

References 0 publications

Canopy morphology and nutritional quality traits as potential grazing value indicators for Lolium perenne varieties

Canopy morphology and nutritional quality traits as potential grazing value indicators for Lolium perenne varieties

Protein and Carbohydrate Fractionation to Evaluate Perennial Ryegrass (Lolium perenne L.) Accessions

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