A Comparison between rotational grazing and set stocking with ewes and lambs at three stocking rates

Young, N. E.; Newton, J. E.

doi:10.1017/s0003356100030774

Cited by 10 publications

(5 citation statements)

References 8 publications

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“…Two-year average peak live weight of lambs grazing rotationally was 2.5 kg/lamb or 8% higher (PC.05) at the end of the green-feed period in July than that of lambs grazing continuously (Table 3). These data are similar to the 8%, IO%, and 14% increases in weaned lamb weights observable in data reported from rotational vs. continuous grazing schemes by Lambourne( 1956), Sharrow and Krueger (1979), and Young and Newton (1975), respectively. Average daily gain'…”

Section: Methodssupporting

confidence: 88%

Rotational vs. Continuous Grazing Affects Animal Performance on Annual Grass-Subclover Pasture

Sharrow¹

1983

Journal of Range Management

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Performance of Romney ewes and their lambs grazing an annual grass-subclover hill pasture was evaluated under both fivepaddock rotational and continuous grazing management treatments during 1977 and 1978. Live weight gains of ewes and lambs tended to be greater under rotational than under continuous grazing during the spring or fall green-feed periods. During the summer dry-feed period, however, sheep maintained thefr body weight better under continuous than under rotational grazing. These data support the hypothesis that rotational grazing most effectively improves animal performance during the green-feed period, perhaps through its reguhtion of pasture production. A common goal of rotational grazing systems is to increase forage production by controlling the frequency and intensity of pasture defoliation. Increased herbage production from rotational compared to continuous grazing management systems has been reported for perennial ryegrass (Ruane and Raftery 1964, Young and Newton 1975) and for perennial ryegrass-white clover (Trifolium repens) pastures (Marsh and Laidlaw 1978). This increase is thought to result from the maintenance of a more nearly optimum Leaf Area Index (LA1 = leaf area per unit ground area) than is achieved under continuous grazing (Smetham 1973). But as Young and Newton (1975) pointed out, increased forage production will result in superior animal production only if the additional forage available is consumed. Lambourne (1956) concluded that where feed supply was insufficient under continuous grazing, the extra feed produced under rotational grazing led to improved lamb growth. When feed supply was already adequate on continuously grazed pastures, the additional forage produced by rotational grazing became rank, causing a decline in forage quality. Lamb growth suffered. This same principle is well illus

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Section: Methodssupporting

confidence: 88%

Rotational vs. Continuous Grazing Affects Animal Performance on Annual Grass-Subclover Pasture

Sharrow¹

1983

Journal of Range Management

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“…However, no management system can be expected to maintain its beneficial effect at excessive stocking rates. Evidence of a decline in the efficacy of rotational grazing at very high stocking rates is also present in the data of Young and Newton (18). We suggest the relationship between stocking rate and grazing management can be described as in Fig.…”

Section: Discussionsupporting

confidence: 76%

The Effect of Stocking Rate on Animal Production From Continuous and Rotational Grazing Systems

Robinson¹,

Simpson²

1975

Grass and Forage Science

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Liveweight and wool production data are presented from a grazing management experiment in which continuous stocking was compared with a Tour-paddock rotational system at three stocking rates on a sown pasture. Significant difTerences were recorded in liveweight and wool production between stocking rates. The overall efTcct of management was non-significant but its interaction with stocking rate and year were both significant..At the intermediate stocking rate (8 wethers/ac, 20 wetfiers/ha) increases in both livewcighl and wool production were recorded for the rotational management system; in this treatment there was also less need for supplementary feeding. Greater wool production was recorded from the continuously grazed treatments at both the high and the low stocking rates but there was little effect on liveweight or the need for supplementary feeding.

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“…As the ewes on the highest allowances were losing substantial amounts of weight it would suggest that this pattern does not reflect voluntary intake of herbage by ewes when grazing but results from the increasing competition of the lamb after the onset of grass consumption at about 3 weeks of age (Wardrop & Coombe, 1961). at 4, 8 and 12 weeks after lambing and Young & Newton (1975) at 6 and 10 weeks after lambing reported intakes by ewes similar to those at the two highest allowances in this experiment. Arnold (1975) reported intakes of 30 g OM/kg LW/day by ewes grazing Phalaris tuberosa -Trifoliwm svbterraneum pasture 3-6 weeks after lambing; but as weight of herbage per unit area declined over the grazing period, this experiment gives no indication of the effect of stage of lactation on intake.…”

Section: Milk Yieldsmentioning

confidence: 68%

The effect of herbage allowance on herbage intake and performance of ewes and their twin lambs grazing perennial ryegrass

Gibb

Treacher

1978

J. Agric. Sci.

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SUMMARYThe effect of herbage allowance on the intake and performance of Scottish Half bred ewes with twin lambs was investigated over the first 16 weeks of lactation. Herbage allowances were defined as g herbage D.M./kg live weight (LW)/day, and were maintained by provision of fresh areas of ungrazed sward each day.Herbage allowances in the range 25–120 g D.M./kg LW/day were offered on an area of perennial ryegrass (Lolium perenne cv. S. 23). Parturition was synchronized and ewes and lambs were turned out to pasture 1 day after lambing.Measurements were made of the herbage intake, live-weight change and milk yield of ewes, of lamb growth rates and of the herbage intake of lambs from 10 weeks of age.Herbage allowance had a significant linear effect on intakes of grass by ewes and lambs. The highest intakes by the ewes were achieved during the second week, and were in the range 23–43 g OM/kg LW/day. Intakes declined, as lactation proceeded, to 19–29 g OM/kg LW/day at week 12. Intakes of lambs were similar in weeks 10 and 12 and were in the range 17–24 g OM/kg LW/day. Allowance had a significant effect on live-weight change of the ewes after the first month and upon final body condition.There was no effect of allowance on milk yield until week 6. Mean milk yields were 2·3 kg/day at day 14, 1·0–1·5 kg/day at day 42 and 0·7–1·1 kg/day at day 84. There was a positive effect of allowance on growth rates of the lambs after the first month. Mean overall growth rates to 84 days of age were 175–243 g/day.

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A Comparison between rotational grazing and set stocking with ewes and lambs at three stocking rates

Cited by 10 publications

References 8 publications

Rotational vs. Continuous Grazing Affects Animal Performance on Annual Grass-Subclover Pasture

Rotational vs. Continuous Grazing Affects Animal Performance on Annual Grass-Subclover Pasture

The Effect of Stocking Rate on Animal Production From Continuous and Rotational Grazing Systems

The effect of herbage allowance on herbage intake and performance of ewes and their twin lambs grazing perennial ryegrass

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