Pasture type in relation to live-weight gain, carcass composition, iodine nutrition and some rumen characteristics of sheep I. Live-weight growth of the sheep

Rae, A. L.; Brougham, R. W.; Glenday, A. C.; Butler, G. W.

doi:10.1017/s0021859600005918

Cited by 44 publications

(19 citation statements)

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“…The consistently higher liveweight gains of sheep grazing pastures dominant in white clover, and to a lesser extent mixed ryegrass-white clover, than of those grazing ryegrass pastures has been demonstrated before (Rae, Brougham, Glenday, and Butler 1963;Hight and Sinclair 1965;Wilson 1966;Gallagher, Watkin, and Grimes 1966). The magnitude of the beneficial effect of white clover on liveweight gains in mixed autumn pastures appears to be influenced by herbage length, being greater with short than longer pastures.…”

Section: Autumn Growth Of Hoggetsmentioning

confidence: 92%

Pasture length and species in relation to the autumn growth of hoggets

Hight¹,

Sinclair²

1967

New Zealand Journal of Agricultural Research

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A trial is described in which the liveweight growth of hoggets grazing six different pastures was compared. The six pastures comprised short perennial ryegrass (SP), long perennial ryegrass (LP), short perennial ryegrass plus white clover (SP + C), long perennial ryegrass plus white clover (LP + C), short white clover (SC), and long white clover (LC).Mean liveweight gains were 6.4, 16.9, 18.1, 24.6, 34.0, and 34.7 lb respectively from

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Section: Autumn Growth Of Hoggetsmentioning

confidence: 92%

Pasture length and species in relation to the autumn growth of hoggets

Hight¹,

Sinclair²

1967

New Zealand Journal of Agricultural Research

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“…In addition. mixed swards of white clover and ryegrasses are of higher quality than the ryegrasses alone (Rae et al 1963;Rae et ai. 1964; Hight and Sinclair 1965;Grimes et ai.…”

Section: Introductionmentioning

confidence: 99%

Studies on the causes of the differences in pasture quality between perennial ryegrass, short-rotation ryegrass, and white clover

Ulyatt¹

1971

New Zealand Journal of Agricultural Research

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In two experiments the intakes and utilisation of pure swards of perennial ryegrass (P), short-rotation ryegrass (S), and whi:e clover (e) were measured with grazing sheep, under conditions where there were differences in live-weight gain between treatments.There were differences in feed intake, but, because of high variability between animals, few were statistically significant. The intake of S was generally higher than that of P. [n one experiment the intake of e appeared to be higher than that of the ryegrasses, hut this was not repeated in the second experiment.There were consistent differences in the gross efficiencies of utilisation of digested energy for live-weight gain in both experiments, in the order e>s>p.Possible reasons for these differences in intake and utilisation are discussed.

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“…White clover (Trifolium repens; C ) differs chemically in most respects from G and in particular has a higher protein and a lower cell wall content. Several studies have indicated that the productive potential of C is higher than that of grass of equivalent digestibility for both growth (Rae et al 1963;Thomson, 1979) and lactation (Rogers et al 1979;Gibb & Treacher, 1983;Thomson et al 1985).…”

mentioning

confidence: 99%

The efficiency of energy utilization in growing cattle consuming fresh perennial ryegrass (Lolium perenne cv. Melle) or white clover (Trifolium repens cv. Blanca)

et al. 1986

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I . Twenty Friesian steers (225 kg live weight) were fed on mid-(M) (June-July) and late-(L) (AugustSeptember) season crops of either fresh perennial ryegrass (Loliumperenne cv. Melle) (G) or white clover (Trifolium repens cv. Blanca) (C). Each of the forage diets was offered at three restricted planes of nutrition above maintenance to compare the effect of forage species on the efficiency of energy utilization. All diets were harvested daily from swards of regrowth forage of intended equivalent digestibility.2. Faecal and urine excretions were measured for 7 and 5 d respectively, followed by two consecutive 24 h measurements of methane, carbon dioxide and oxygen exchange in open-circuit respiration chambers.3. The apparent digestibility of the energy in perennial ryegrass (0.759) was marginally higher (P < 0.01) than that in white clover (0.748); the mid-and late-season forages were of similar ( P > 0.05) digestibilities. Metabolizable energy (ME):digestible energy (DE) in diet G (0.837) was significantly ( P < 0,001) different from that in diet C (0.812). The partition of energy losses when expressed as MJ/GJ gross energy intake (GEI) indicated that energy lost as methane was not significantly different ( P > 0.05) either between forages (G 62.8, C 63.4) or between seasons (M 63.2, L 63.1). Energy excretion in urine was higher for cattle fed on diet C (77.5) compared with diet G (60.5) ( P < 0.001). Heat production was similar (P 0.05) between forages (G 480, C 478), but lower (P < 0.01) for L (471) compared with M(486). Energy retention (by difference) was lower ( P < 0.001) for diet C (132) than G (156) and for M (138) than L (149) (P < 0.05). 4.Parallel-line analysis of unscaled ME intake (MEI) in relation to retained energy (RE; MJ/d) indicated that the efficiency of utilization (k,) was similar (P > 0.05) between perennial ryegrass (0.42) and white clover (0.46).Linear extrapolation of the values to zero energy retention indicated that maintenance requirements of ME (&,; MJ/d) were 23.3 for diet G and 28.8 for diet C. The extrapolated Em when expressed in relation to a measured fasting heat production (FHP) of 22.8 (MJ/d) resulted in a derived efficiency of utilization of ME for maintenance (k,) of 0.97 (G) and 0.79 (C), suggesting an underestimate of Em for diet G.5. Asymptotic exponential curves (representing the law ofdiminishing returns) were fitted to the unscaled values, ME1 and RE (MJ/d), and extrapolated to zero energy retention and zero energy intake. The derived estimates of FHP (MJ/d) 18.0 (G) and 22.0 (C) were not significantly different (P > 0.05) from the observed value of 22.8 MJ/d. Using the measured FHP as additional data points, the exponential model accounted for significantly more variance (P < 0,001) compared with the linear regression method of analysis. Exponential analysis resulted in estimates of Em (MJ/d) of 29.04 for diet G and 31.80 for C. The k , for each forage was calculated, assuming linearity of response, as 0.78 (G) and 0.72 (C). The calculation of k, at fixed positions o...

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Pasture type in relation to live-weight gain, carcass composition, iodine nutrition and some rumen characteristics of sheep I. Live-weight growth of the sheep

Cited by 44 publications

References 1 publication

Pasture length and species in relation to the autumn growth of hoggets

Pasture length and species in relation to the autumn growth of hoggets

Studies on the causes of the differences in pasture quality between perennial ryegrass, short-rotation ryegrass, and white clover

The efficiency of energy utilization in growing cattle consuming fresh perennial ryegrass (Lolium perenne cv. Melle) or white clover (Trifolium repens cv. Blanca)

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