The assessment of persistence and its application to the evaluation of early perennial ryegrass cultivars

Camlin, M. S.; Stewart, R. H.

doi:10.1111/j.1365-2494.1976.tb01107.x

Cited by 19 publications

(14 citation statements)

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“…The mean grass yields of 13 000 to 15000 kg DM per ha for the swards harvested at 6-and 9week intervals with an input of 370 kg of N per ha are similar to those recorded by Camlin and Stewart (1976) from perennial-ryegrass swards with a similar N input. The 014 increase in yield when cutting interval was increased from 6 to 9 weeks is in agreement with the results of Bartholomew (1975), but the reduction in yield when cutting interval was increased from 9 to 12 weeks is unusual.…”

Section: Discussionsupporting

confidence: 74%

The effect of frequency of harvesting grass for silage and level of concentrate supplementation on the intake and performance of beef cattle

Steen

McIlmoyle

1982

Anim. Sci.

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A randomized-block experiment has been carried out over 2 consecutive years to examine the effects of frequency of harvesting grass for silage, and level of concentrate supplementation, on the intake and performance of beef cattle. Swards of S24 perennial ryegrass were harvested at 6-, 9-and 12-week intervals throughout the growing season, commencing on 14 May, 4 June and 25 June respectively. The three silages were offered ad libitum with 0, 1, 2 or 3 kg per head per day of cereal-based concentrates to 84 Hereford-cross suckled calves (mean initial live weight 313 kg) in a 3 x 4 factorial design experiment in each year. The treatments were imposed for a mean period of 100 days. The digestible organic matter in the dry-matter values of the silages harvested at 6-, 9-and 12-week intervals were 0-684, 0-646 and 0-607 respectively. The mean silage dry-matter intakes and live-weight gains for the silages harvested at 6-, 9-and 12-week intervals were 4-75, 4-70 and 4-74 (s.e. 0-08) kg/day, and 0-75, 0-67 and 0-52 (s.e. 0-020) kg/day, respectively. The mean silage dry-matter intakes and live-weight gains for the supplement at 0, 1, 2 and 3kg/day were 5-23, 4-79, 4-72 and 4-17 (s.e. 009)kg/day, and 0-38, 0-57, 0-75 and 0-88 (s.e. 0-023) kg/day, respectively. There was a significant interaction between cutting interval and level of supplementation for live-weight gain, the response to supplementation declining as silage digestibility increased.

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Section: Discussionsupporting

confidence: 74%

The effect of frequency of harvesting grass for silage and level of concentrate supplementation on the intake and performance of beef cattle

Steen

McIlmoyle

1982

Anim. Sci.

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“…The ryegrass cultivars revealed differences in their seasonality of production and persistence, which corresponded closely with their behaviour in monoculture swards (Camlin and Stewart, 1976;1978). The seasonal growth characteristics of the ryegrass cultivars followed predictable patterns at the first two harvests in all years and differences between cultivars during the rest of the year were always small.…”

Section: Ryegrass Cuhivar Effectsmentioning

confidence: 68%

“…1976;1978). Stewart (1976;1978) revealed strong negative correlations between ingress of unsown herbage species and ryegrass cultivar persistence in all maturity groups (r= -0 98*** early, r= -077** mid-season and r= -095*** late). It seems that ryegrass cultivars which permit good clover development are also those which, in the absence of clover, readily become invaded by weed species, i.e.…”

Section: Meanmentioning

confidence: 90%

“…Regression lines between unsown grass species yields (data from Camlin and Stewart, 1976;1978) and mean clover contribution in this experiment are shown in Figure 5. There is quite a wide divergence of points from the regression lines, and the correlations in Table 6 do not account for all variation in clover contribution between ryegrass cultivars.…”

Section: Meanmentioning

confidence: 98%

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Competitive effects between ten cultivars of perennial ryegrass and three cultivars of white clover grown in association

Camlin¹

1981

Grass and Forage Science

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In an experiment of four years duration, the competitive relationships between three cultivars of white clover {Trifolium repens L.) and ten cultivars of perennial ryegrass (Lolium perenne L.) were studied under a N fertilizer regime of 200-240 kg ha'' a''. The clover cultivars were selected to embrace the various leaf sizes from medium large to small and the ryegrasses included early, mid-season and late cultivars with a known range of persistence.During the experiment there was a progressive decline in the contribution of clover, though the different characteristics of each of the clover and ryegrass cultivars produced substantial deviations from the average trend. The clover cultivar Kersey was significantly more aggressive towards the companion grass cultivars than either S100 or S184. It produced consistently greater clover contribution to total yield than the other two cultivars and significantly depressed the yields of some of the companion grass cultivars. There was evidence that compatibility of the ryegrass cultivars with clover was inversely related to persistence; the non-persistent ryegrass cultivars S321 and Presto consistently produced lower grass yields than the more persistent cultivars and consequently permitted greater clover contribution. In the second and third years yield substitution effects between clover and grass components substantially reduced differences in the total grassclover yield. Correspondence: Dr M. S. Camlin, Plant Testing Sialion, 50 Houston Road, Crossnacreevy.CasUereagh, Belfast BT6 9SH, UK. O142-5242/8l/09O0-0169$02.O0 (0 1981 Blackwell Scientific PublicationsThe interactions revealed In the experiment showed that both ryegrass and clover cultivars have the potential to influence each other when in association although, with minor exceptions, total annual yields were similar for all grass and clover mixtures at the moderately high level of N applied.

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“…(2010). Sward density of PRG was scored visually on a 0–5 scale (where 0 = no PRG present, 5 = 100% PRG present) in June (GS‐J) and at the end of December (GS‐D), using the technique of Camlin and Stewart (1976). Estimates were validated using inclined point‐quadrat (Wilson, 1960) taken across the sward density range.…”

Section: Methodsmentioning

confidence: 99%

Effect ofLolium perennesward density on productivity under simulated and actual cattle grazing

Creighton

Gilliland

Delaby

et al. 2012

Grass and Forage Science

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The objective of this study was to quantify the effect of perennial ryegrass (Lolium perenne L.; PRG) sward density on seasonal and total DM yield under simulated grazing and animal grazing by cattle, and to assess the effectiveness of visually estimated ground scores (GSs) for predicting sward PRG density. The study incorporated five different seeding rates of PRG, each replicated three times, to simulate swards ranging in PRG density typical of different ages and conditions. There was no significant difference between defoliation managements for total DM yield, but sward PRG density had a significant effect on both the seasonal and total DM herbage yield under both systems. Under simulated grazing, total DM yield ranged from 10·7 to 12·0 t DM ha−1 with increasing sward PRG density at a GS range of 1·70–4·28 (mean of 2 years’ data, P < 0·01). Under animal grazing, the yield range was from 10·3 to 12·2 t DM ha−1 for a GS range of 1·50–3·39 (mean of 2 years’ data, P < 0·01). The largest differences in DM yield occurred during the spring period. The relationship between sward DM yield and GS was significant (P < 0·001) for both simulated and animal‐grazed swards. Each unit increase in midseason GS (June) related to an average yield increase of 350 kg DM ha−1 under simulated grazing and a 721 kg DM ha−1 increase under cattle grazing. Every unit increase in the GS at the end of the grazing season (December) was associated with a 460 or 1194 kg DM ha−1 increase under simulated and animal grazing, respectively. These results show that visual estimates of density were an effective tool in describing PRG density and that this could be related to DM yield potential. Further investigations may provide a threshold value below which the renewal of swards could be advised based on a visual GS of PRG.

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The assessment of persistence and its application to the evaluation of early perennial ryegrass cultivars

Cited by 19 publications

References 1 publication

The effect of frequency of harvesting grass for silage and level of concentrate supplementation on the intake and performance of beef cattle

The effect of frequency of harvesting grass for silage and level of concentrate supplementation on the intake and performance of beef cattle

Competitive effects between ten cultivars of perennial ryegrass and three cultivars of white clover grown in association

Effect ofLolium perennesward density on productivity under simulated and actual cattle grazing

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