The relationship between the digestibility of a sward and the herbage consumption of grazing calves

Hodgson, J.

doi:10.1017/s0021859600017172

Cited by 24 publications

(19 citation statements)

References 7 publications

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“…The lack of any positive response in DM intake to the highest herbage OM digestibility coefficients (determined at equal intakes) in both experiments differs from results obtained elsewhere with long hays and fresh forages (Blaxter, Wainman and Wilson, 1961;Hodgson, 1968). Since DOM intakes of concentrate offered ad libitum in both experiments were significantly greater than maximum DOM intake of dried grass it is unlikely that intakes of dried grass DOM were limited by a chemostatic mechanism.…”

Section: Intakecontrasting

confidence: 85%

The performance of early-weaned calves offered concentrates or artificially dried grasses

Marsh¹

1974

Anim. Sci.

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In two experiments dried grass cobs or concentrate were offered to calves for 20 weeks after weaning. In Experiment 1 the grasses were harvested in the autumn and in Experiment 2 in the spring. Within each experiment three grasses differing in quality and two levels of concentrate were compared. Dry-matter intake of the dried grasses highest in digestibility was lower than that of medium digestibility grass, and hardness of package, palatability and mould infestation were implicated as possible causal factors. Live-weight gains by calves were closely correlated with digestible organic matter (DOM) intake. There was no significant difference between spring harvested grasses and concentrate in efficiency of utilization of DOM for live-weight gain but autumn grasses were used less efficiently than concentrate. At similar rates of gain the replacement value (dry-matter basis) of dried grass for concentrate averaged 142 : 1.

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Section: Intakecontrasting

confidence: 85%

The performance of early-weaned calves offered concentrates or artificially dried grasses

Marsh¹

1974

Anim. Sci.

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“…Differences between seasons in the quantity of herbage intake by grazing animals were also noted by several authors (Baker et al, 1980;Penning et al, 1991). Herbage intake increased as digestibility of herbage intake increased and this agrees with the results obtained by several workers (Hodgson, 1968;Hodgson et al, 1991). However, it should be noted that perhaps some changes in sward canopy structure between summer and autumn resulted in a more heterogeneous structure in autumn.…”

Section: Discussionsupporting

confidence: 90%

“…Forage intake and selectivity grazing are functions of numerous pasture and animal characteristics (Arnold, 1964;Cordova et al, 1978;Milne, 1991). Intake has been correlated with forage availability, sward height and nutritional quality (Hodgson, 1968;Allison, 1985;Minson, 1987). Such complexity has made prediction of forage intake and 2 VALDÉS C. ET AL.…”

Section: Introductionmentioning

confidence: 99%

Herbage intake by Churra ewes grazing at two different sward heights

Valdés¹,

Mantecón²,

Giráldez³

et al. 1995

J. Anim. Feed Sci.

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Herbage intake and some characteristics of diet selected by grazing Churra ewes were studied on two plots of a Lolium-Festuca-Trifolium pasture maintained at two different sward heights (sward heights (SH): 4 cm (SSH) and 8 cm (HSH) in two periods (PE): summer and autumn. Herbage intake was estimated from measurements of faecal output and of digestibility of extrusa samples. With the exception of crude protein content, no significant (P > 0.05) effects of PE nor SH were detected in the chemical composition and digestibility of herbage on offer. Daily herbage intake (g OM/kg live weight) was greater (P ^0.10) on HSH than on SSH and was also greater (P =£ 0.05) in autumn than in summer. Significant effects of PE (P^O.01) and SH (P=%0.05) were obtained in the selection ratios (calculated as the content of each considerate component in extrusa samples divided by its content in the herbage on offer) for all chemical fractions and for digestibility. Except for cellulose, interaction between main factors had a significant (P^ 0.001) effect on the selection ratios.

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“…Some studies have pointed out a major increase of intake as a function of fertilisation [9,17], while others showed no such effect [6]. In fact, fertilisation may have an indirect effect by modulating the green leaf mass per unit area, which is a determinant of herbage availability [19,29,30].…”

Section: N Fertilisationmentioning

confidence: 99%

Effect of nitrogen fertiliser rate and protein supplementation on the herbage intake and the nitrogen balance of grazing dairy cows

2002

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-The objective of this study was to examine the effect of the level of reducing nitrogen (N) fertiliser rate on herbage intake and N balance of dairy cows grazing a pure perennial ryegrass pasture. The addition of a protein supplement to cows grazing the low N fertilised sward was also evaluated. Three treatments were compared over three periods of 2 weeks using 9 fistulated cows in a 3 × 3 Latin square design: HN (80 kg N·ha -1 ·regrowth -1 ), LN (0-20 kg N·ha -1 ·regrowth -1 ), LN+S (LN + 2 kg of soybean meal (SBM)). Daily herbage organic matter (OM) intake was estimated by chromic oxide dilution in the faeces. Nitrogen and ADF contents in faecal OM were used to estimate the herbage digestibility. Herbage mass, grazing behaviour and rumen fermentation pattern were measured. Nitrogen intake was estimated by the chemical composition of the defoliated herbage and urinary N was calculated by subtracting milk N and faecal N output from N intake. Digestibility (0.79), daily intake (16.4 kg OM), grazing time (512 min) and the proportion of volatile fatty acid were not affected by reducing the N fertiliser rate. These results may be explained by the moderate effect of N fertilisation on herbage mass which remained high in the LN swards (3.9 vs. 4.7 t OM·ha -1 for HN) and the rather large herbage allowance which allowed the cows to graze a herbage with a crude protein content that still remained higher than 160 g·kg -1 DM. On the LN sward, N intake was significantly lower (-80 g·d -1 ) (P < 0.01), faecal N and milk N output remained unchanged, whereas urine N output decreased (-77 g·d -1 ) (P < 0.01). Protein supplementation did not depress HOMI or grazing time, supplemented cows consumed 2.4 kg OM more (P < 0.01) and this increased milk yield by 1.3 kg·kg -1 SBM (P < 0.01). SBM supplementation largely increased N intake, and finally N excreted in the urine. It was concluded that N fertilisation, and N supplementation are efficient means to manipulate animal performances and N balance in grazing dairy cows. . Res. 51 (2002) 279-293  INRA, EDP Sciences, 2002 DOI: 10.1051/animres:2002022Résumé -Influence du niveau de fertilisation azotée et de la complémentation azotée sur l'ingestion et le bilan azoté des vaches laitières pâturant du ray-grass anglais. L'effet du niveau de fertilisation azotée et de la complémentation avec du tourteau de soja (50 % normal et 50 % tanné) a été étudié chez des vaches laitières pâturant un ray-grass anglais. Trois traitements ont été comparés avec 9 vaches fistulées au niveau du rumen, selon un schéma en carré latin 3 × 3 sur des périodes de 2 semaines : HN (80 kg N·ha -1 ·cycle -1 ), LN (0-20 kg N·ha -1 ·cycle -1 ), LN+S (LN + 2 kg de tourteau de soja (SBM)). Les quantités d'herbe ingérée ont été calculées en mesurant la quantité de fèces par dilution de l'oxyde de chrome et en estimant la digestibilité de l'herbe ingérée à partir de la teneur en N et en ADF des fèces. L'azote ingéré a été estimé à partir de la composition chimique de l'herbe dé-foliée et l'azote urinaire a été ...

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The relationship between the digestibility of a sward and the herbage consumption of grazing calves

Cited by 24 publications

References 7 publications

The performance of early-weaned calves offered concentrates or artificially dried grasses

The performance of early-weaned calves offered concentrates or artificially dried grasses

Herbage intake by Churra ewes grazing at two different sward heights

Effect of nitrogen fertiliser rate and protein supplementation on the herbage intake and the nitrogen balance of grazing dairy cows

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