THE DIGESTIBILITY OF THE LEAVES AND STEMS OF PERENNIAL RYEGRASS, COCKSFOOT, TIMOTHY, TALL FESCUE, LUCERNE AND SAINFOIN, AS MEASURED BY AN <i>IN VITRO</i> PROCEDURE

Terry, R. A.; Tilley, J. M. A.

doi:10.1111/j.1365-2494.1964.tb01188.x

Cited by 244 publications

(166 citation statements)

References 11 publications

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“…However, the rate of decline in IVTD and IVCWD, and the rate of increase in NDF concentration was much greater for stems than leaves. These results agree with those of Terry and Tilley (1964) and Mowat et al (1965) on in vitro digestibility of dry matter, and with those of Sanderson and Wedin (1989) on in vitro digestibility and NDF concentration. The results of Mowat et al (1965) also indicated that the digestibilities of both leaves and stems of earlymaturing cultivars on a given date were less than those of late-maturing cultivars.…”

Section: Results and Discussion Relationship Of Nutritive Value With supporting

confidence: 82%

Leaf and stem nutritive value of timothy cultivars differing in maturity

Bélanger¹,

McQueen²

1997

Can. J. Plant Sci.

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Bélanger, G. and McQueen, R. E. 1997. Leaf and stem nutritive value of timothy cultivars differing in maturity. Can. J. Plant Sci. 77: 237-245. The nutritive value of herbage is a function of the nutritive value of its component leaves and stems and their proportion in the herbage. A previous study indicated that the proportion of leaves in the herbage did not explain entirely the differences in in vitro true digestibility and NDF concentrations between early and late-maturing timothy (Phleum pratense L.) cultivars. It was therefore hypothesized that the leaves and stems of early and late-maturing cultivars differ in nutritive value. The evolution of leaf and stem nutritive value of field-grown timothy cultivars differing in maturity, and the relationships between parameters of leaf and stem nutritive value, and the leaf to weight ratio (LWR) were studied during primary growth in two experiments. On a given date, stems of early-maturing cultivars had in vitro true digestibilities of dry matter and cell wall up to 61 g kg -1 DM and 71 g kg -1 DM lower that those of late-maturing cultivars, respectively. The NDF concentration of stems of early-maturing cultivars was up to 32 g kg -1 DM greater than that of late-maturing cultivars. There were no cultivar differences in leaf in vitro true digestibilities of dry matter and cell wall, and NDF concentration on a given date. At a given LWR, however, the leaves and stems of early-maturing cultivars had greater in vitro true digestibilities of dry matter and cell wall, and a lower NDF concentration than those of late-maturing cultivars. Our results indicate that differences in herbage nutritive value at a given stage of maturity between early-and late-maturing timothy cultivars is explained by a greater nutritive value of leaves and stems of the early-maturing cultivars.Key words: Phleum pratense L., timothy, cultivar, digestibility, cell wall, leaf, stem Bélanger, G. and McQueen, R. E. 1997. Valeur nutritive des feuilles et des tiges de cultivars de fléole des prés ayant des maturités différentes. Can. J. Plant Sci. 77: 237-245. La valeur nutritive des fourrages dépend de la valeur nutritive des feuilles et des tiges, et de leurs proportions respectives dans les fourrages. Une étude précédente a démontré que la proportion des feuilles n'expliquait pas entièrement les différences de digestibilité in vitro de la matière sèche et de teneur en NDF entre les cultivars hâtifs et tardifs de fléole des prés (Phleum pratense L.). Ainsi, nous avons émis l'hypothèse que les cultivars hâtifs et tardifs diffèrent également par la valeur nutritive de leurs feuilles et tiges. L'évolution de la valeur nutritive des feuilles et tiges de cultivars hâtifs et tardifs de fléole des prés cultivée au champ, et la relation entre les paramètres de valeur nutritive des feuilles et tiges d'une part et la proportion de feuilles dans la biomasse d'autre part ont été étudiées au cours de deux expérimentations réalisées pendant la croissance primaire. A une date donnée, les tiges des cultivars hâtifs...

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Section: Results and Discussion Relationship Of Nutritive Value With supporting

confidence: 82%

Leaf and stem nutritive value of timothy cultivars differing in maturity

Bélanger¹,

McQueen²

1997

Can. J. Plant Sci.

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“…Bite rate was significantly higher on Aries HD than on Yatsyn 1 pasture, perhaps reflecting the higher proportion of ryegrass leaf in this spring pasture (Table 4). The digestibility of ryegrass stem declines at a much faster rate than that of the leaf (Terry & Tilley 1964). However, the greater leaf content of Aries HD ryegrass in this study was not reflected in higher digestibility of either whole sward, plucked samples, or oesophagealfistulated sheep samples.…”

Section: Discussioncontrasting

confidence: 43%

Evaluation of the feeding value of Aries HD perennial ryegrass(Lolium perenne).I. Performance of lactating ewes in spring

Bluett

Hodgson

Kemp

et al. 1999

New Zealand Journal of Agricultural Research

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The feeding value of Aries HD perennial ryegrass {Lolium perenne) was evaluated over spring (3 Sep to 1 Dec 1996) using Romney ewes suckling single lambs, with Yatsyn 1 perennial ryegrass as the control cultivar. There were three replicate plots of each cultivar of 0.33 ha continuously stocked with 6 ewes per plot after lambing to maintain a mean sward surface height of 6 cm. Ewes were removed from the area on 5 November at weaning. Ewe liveweight gain tended to be higher on Aries HD than Yatsyn 1 over September (94 versus 56 ± 14.5 g day -1 , P < 0.07) which coincided with a significantly higher herbage intake (1.78 versus 1.37 ± 0.038 kg DM day -1 , P < 0.04). The percentage of ryegrass leaf was higher in Aries HD pasture, as were ewe bite rate and calculated bite weight. The time spent grazing on these ryegrass cultivars was between 11.0 and 11.3 hours per 24-h period. There was no significant difference in growth rates of suckling lambs between cultivars. Information on herbage nutritive value, herbage intake, and grazing behaviour are discussed in relation to the differences in ewe performance. A99033

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“…As pseudostem is a collection of leaf sheaths rolled together (Robson et al, 1988), it is more digestible than true stem. Evidence suggests that during vegetative growth, the digestibility of pseudostem is not significantly reduced compared with the leaf blade (Terry and Tilley, 1964), offering further explanation for the absence of a relationship between sward structure and chemical composition during the vegetative growth phase.…”

Section: Sward Chemical Compositionmentioning

confidence: 97%

“…The values are comparable with those reported by Smit et al (2005b) (86.9%) and Gowen et al (2003) (84.7%). The OMD concentration of the leaf is higher than that of stem or dead material (Terry and Tilley, 1964;Hacker and Minson, 1981); a 5.5% change in leaf content is equal to a 1% change in digestibility (Stakelum and O'Donovan, 1998). During the reproductive growth phase of the current study, a 1% change in digestibility was brought about by a 3.1% change in leaf proportion.…”

Section: Sward Chemical Compositionmentioning

confidence: 99%

Effect of perennial ryegrass (Lolium perenne L.) cultivars on the milk yield of grazing dairy cows

Wims

McEvoy

Delaby

et al. 2013

Animal

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The objective of this experiment was to investigate the effect of four perennial ryegrass cultivars: Bealey, Astonenergy, Spelga and AberMagic on the milk yield and milk composition of grazing dairy cows. Two 4 3 4 latin square experiments were completed, one during the reproductive and the other during the vegetative growth phase of the cultivars. Thirty-two Holstein-Friesian dairy cows were divided into four groups, with each group assigned 17 days on each cultivar during both experiments. Within each observation period, milk yield and milk composition, sward morphology and pasture chemical composition were measured. During the reproductive growth phase, organic matter digestibility (OMD) was greater for Bealey and Astonenergy (P , 0.001; 11.6%). AberMagic contained a higher stem proportion (P , 0.01; 10.06) and a longer sheath height (P , 0.001; 11.9 cm). Consequently, cows grazing AberMagic recorded a lower milk yield (P , 0.001; 21.5 kg/day) and a lower milk solids yield (P , 0.001; 20.13 kg/day). During the vegetative growth phase, OMD was greater (P , 0.001; 11.1%) for Bealey, whereas the differences between the cultivars in terms of sward structure were smaller and did not appear to influence animal performance. As a result, cows grazing Bealey recorded a higher milk yield (P , 0.001; 10.9 kg/day) and a higher milk solids yield (P , 0.01; 10.08 kg/day). It was concluded that grass cultivar did influence milk yield due to variations in sward structure and chemical composition.Keywords: perennial ryegrass, cultivar, sward structure, dairy cow, grazing ImplicationsThis study investigated the effect of four perennial ryegrass cultivars on dairy cow milk yield and identified the cultivar characteristics responsible for variations in milk yield. The information generated by this study will be of significant use in pasture-based production systems. As the study identified the cultivar characteristics responsible for animal performance, it will allow grass breeders to increase their focus on such traits. Animal performance-orientated breeding programmes should result in grass cultivars becoming available to farmers that will increase animal performance from grazed grass, thereby further improving the economics of pastoral-based animal production systems.

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THE DIGESTIBILITY OF THE LEAVES AND STEMS OF PERENNIAL RYEGRASS, COCKSFOOT, TIMOTHY, TALL FESCUE, LUCERNE AND SAINFOIN, AS MEASURED BY AN IN VITRO PROCEDURE

Cited by 244 publications

References 11 publications

Leaf and stem nutritive value of timothy cultivars differing in maturity

Leaf and stem nutritive value of timothy cultivars differing in maturity

Evaluation of the feeding value of Aries HD perennial ryegrass(Lolium perenne).I. Performance of lactating ewes in spring

Effect of perennial ryegrass (Lolium perenne L.) cultivars on the milk yield of grazing dairy cows

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