<i>IN VITRO</i> AND FAECAL NITROGEN TECHNIQUES FOR PREDICTING THE VOLUNTARY INTAKE OF <i>CHLORIS GAYANA</i>

Minson, D. J.; Milford, R.

doi:10.1111/j.1365-2494.1967.tb00522.x

Cited by 17 publications

(4 citation statements)

References 15 publications

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“…Techniques to estimate ME are too sophisticated for routine analyses but ME is usually well correlated with dry matter digestibility (DMD) (Minson & Milford, 1967). DMD has been considered to be the most useful measure of nutritive value because it has a direct effect on nutrient absorption in the alimentary canal, and it influences the amount of feed consumed (Ulyatt, 1973;Bransby, 1.981).…”

Section: Introductionmentioning

confidence: 99%

The effects of continuous and rotational grazing of sourveld on the quality of herbage selected by Simmentaler heifers

Kreuter

Tainton

1989

Journal of the Grassland Society of Southern Africa

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Section: Introductionmentioning

confidence: 99%

The effects of continuous and rotational grazing of sourveld on the quality of herbage selected by Simmentaler heifers

Kreuter

Tainton

1989

Journal of the Grassland Society of Southern Africa

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“…Milford & Minson (1968) also found that the nutritive value of Rhodes grass varieties was not related to leafliness. Minson & Milford (1967) showed that the rate of dry matter digestibility in vitro was related to the voluntary intake of two varieties of Rhodes grass. However, the method proved incapable of recognizing differences in voluntary intake between leaf and stem (Laredo & Minson, 1973).…”

Section: Discussionmentioning

confidence: 99%

Herbage quality in Rhodes grass (Chloris gayana Kunth). 2. Intra-variety variation in yield and digestibility of plants of similar heading date.

Boonman¹

1978

NJAS

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20 clones of similar heading date and selected from within Rhodes grass cv. Masaba were assessed at 3, 6 and 9 wk of regrowth. Lengthening the period of regrowth increased yield of DM and yield of DOM, but decreased digestibility in vitro of leaf, stem and whole-sward samples and leaf:stem ratios. Clonal effects were also significant for these characters except for leaf digestibility and leaf:stem ratio. No significant clone X regrowth period interactions were observed. Stem and leaf digestibility fell by 0.20 and 0.17 units daily, resp., while leaf:stem ratio dropped to 1.1 at 9 wk regrowth which coincided with initial heading. At this stage whole sward digestibility had fallen to 53, at a rate of 0.22/day. Leaf digestibility was always higher than that of stem. Clones differed significantly in digestibility showing a 5-unit range which had no relation to leaf:stem ratios. The 7 clones best in digestibility were among the 9 lowest in herbage yield. The ranking for yield of DOM did not differ from that for yield of DM, which showed a range of 1.38-2.45 t/ha. It is concluded that potential genetic gain in digestibility and leaf:stem ratio is offset by a corresponding decline in herbage yield. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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“…Some rumen bacteria are attached to the surface of food particles in the rumen (Monson, Powell & Burton, 1972) and hence the greater the surface area exposed to bacteria the more rapidly the food is digested. I n vitro studies have shown that finely ground food is digested more rapidly than coarsely ground food (Minson & Milford, 1967). Thus the chaffed leaf fraction, which had a surface area three times that of the stem fraction (Table I), might be expected to be more rapidly digested than the stem fraction, and this may account for some of the shorter retention time observed with the leaf fraction.…”

Section: Discussionmentioning

confidence: 99%

The effect of pelleting on the voluntary intake and digestibility of leaf and stem fractions of three grasses

Laredo

Minson

1975

Br J Nutr

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I . Leaf is eaten in greater quantities than stem of similar digestibility. T o determine whether this difference is caused by physical or chemical factors, leaf and stem fractions from Digitaria decumbens, Chloris gayana and Setaria splendida were fed ad lib. to sheep in the chopped and pelleted forms. Pellets were made from leaf and stem which had been ground through a screen with 3 mm holes. All sheep received a protein and mineral supplement. 2.Voluntary intake of chopped leaf was 34 % higher than that of the chopped stem fraction (40.3 and 30.0 g/kg b o d y -~e i g h t~' '~ respectively, P < 0.01) although dry matter digestibility ratios were similar (0.478 and 0.450 respectively, P > 0.05). The higher intake of leaf was associated with a larger surface area (13400 and 5200 mma/g for chopped leaf and stem respectively), lower bulk density (60 and 180 kg/mS respectively) and lower neutral-detergent fibre (706 and 724 g/kg respectively), acid-detergent fibre (383 and 413 g/kg respectively) and lignin (42 and 59 g/kg respectively) contents. Chopped leaf was retained in the reticulo-rumen for a shorter time than the stem fraction (19.9 and 26.4 h respectively).3. Grinding and pelleting increased the voluntary intake of the leaf fraction by 88 yo and the stem fraction by 60 %. This increased voluntary intake caused by grinding and pelleting was not accompanied by any significant changes in the chemical composition of the diet. Grinding and pelleting reduced the time that the food was retained in the reticulo-rumen and this change appeared sufficient to account for the observed increases in voluntary intake.4. It was concluded that the higher intake of the leaf fraction of grasses is caused by differences in retention time of food in the reticulo-rumen. These differences in retention time are caused by differences in physical properties and not chemical composition.Studies with separated leaf and stem of five tropical grasses have shown the voluntary intake of leaf to be 46% higher than that of stem despite a slightly lower dry matter (DM) digestibility of the leaf fraction (Laredo & Minson, 1973). This higher intake of the leaf was associated with a larger surface area initially available to bacterial degradation and a shorter retention time of DM in the reticulo-rumen. When the leaf and stem were finely ground there was no difference in the rate of DM digestion in vitro (Laredo & Minson, 1973). The leaf fractions contained more nitrogen but less fibre and Iignin than the corresponding stem fractions.If the voluntary intake of leaf and stem fractions is limited by physical factors, then voluntary intake will be increased if the physical properties of the diet are changed by grinding and pelleting. However, if the low intake of the stem is caused by a nutrient deficiency then grinding and pelleting will not increase voluntary intake (Minson, 1967).The object of this study was to identify the cause of the lower voluntary intake of stem. Measurements were made of the digestibility of leaf and stem fractions of thre...

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IN VITRO AND FAECAL NITROGEN TECHNIQUES FOR PREDICTING THE VOLUNTARY INTAKE OF CHLORIS GAYANA

Cited by 17 publications

References 15 publications

The effects of continuous and rotational grazing of sourveld on the quality of herbage selected by Simmentaler heifers

The effects of continuous and rotational grazing of sourveld on the quality of herbage selected by Simmentaler heifers

Herbage quality in Rhodes grass (Chloris gayana Kunth). 2. Intra-variety variation in yield and digestibility of plants of similar heading date.

The effect of pelleting on the voluntary intake and digestibility of leaf and stem fractions of three grasses

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