Effect of lupin grain and recently cut lucerne on intake and digestibility of mature weathered herbage by Border Leicester × Merino ewes

Roberts, GB; Kenney, PA; Reeve, JL

doi:10.1071/ea9790156

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…The general pattern of responses to supplementation in Expt 1, with respect to both roughage intake and weight gain, is similar to that reported by Roberts, Kenney & Reeve (1979), Hodge & Bogdanovic (1983) and Freer et al (1985). The expected rates of weight gain for the lambs on treatments B, C, and D, estimated according to the Agricultural Research Council (1980) were 0, 9 and 38 g/day, respectively, which agree well with the observed values of -5, 21, and 45 + 6-7 g/day, respectively.…”

Section: Discussionsupporting

confidence: 84%

Effects of a concentrate supplement on the intake and digestion of a low-quality forage by lambs

et al. 1988

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SummaryWeaned lambs of mean weight 25 kg were offered a diet of mature oaten hay or hay supplemented with a pelleted mixture of oat grain and sunflower meal (2:1), at one of three rates, for 86 days. The effect of the supplement on the voluntary intake of hay was measured during the first 20 days when feed was offered twice daily (Expt 1), after which the effects on ruminal and post-ruminal digestion were investigated under continuous feeding conditions (Expt 2).In Expt 1 the first increment of supplement increased the total intake of organic matter (OM) but increasing the supplement further, up to 510 g D.M., had no additional effect. The voluntary intake of oaten hay was not significantly reduced by the lowest rate of supplementation but at higher rates was depressed at a mean rate of 92 g/100 g supplement. Rates of change in fasted weight on the four treatments were —63, —5, 21 and 45 g/day, respectively.In Expt 2, where the rates of hay intake were held at 85% of those achieved in Expt 1, the first increment of supplement increased the pool size of OM and cell wall components in the reticulorumen by about 50%. It also increased their outflow rates at the abomasum by 24% and 33%, respectively, but significantly decreased the fractional outflow rate and fractional digestion rate of cell wall components. Supplementation decreased the proportion of apparent OM digestion that occurred in the reticulo-rumen from 76% to 65%. The presence of supplement doubled the ammonia pool in the rumen and increased the abomasal flow on non-ammonia nitrogen (NAN) and microbial NAN by 70%. Estimates of the amounts of crude protein apparently digested in the intestines (DCPi) increased linearly with proportion of supplement in the diet. However, the apparent digestibility of the hay was decreased, rather than increased, by the supplement. Although higher rates of supplement did not significantly change the elevated rumen pools of OM and cell wall components, there was a consistent tendency for these to decrease.The results are consistent with the view that the intake of unsupplemented hay was limited by its low nitrogen content and the intake of supplemented hay may have been limited primarily by the capacity of the reticulo-rumen, although other factors were increasingly involved at higher rates of supplementation.

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Section: Discussionsupporting

confidence: 84%

Effects of a concentrate supplement on the intake and digestion of a low-quality forage by lambs

et al. 1988

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Responses to supplements by weaned lambs grazing mature pasture or eating hay in yards

Freer¹,

Dove²,

Axelsen³

et al. 1985

Aust. J. Exp. Agric.

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Weaned crossbred lambs grazing mature pasture in summer at stocking rates of 14, 28 or 42 lambs/ha were supplemented for 60 days with 0, 400, 600 or 800 g/day of either sunflower meal or a 1:1 mixture of sunflower meal and oats. Mean daily gains in fasted weight without and with supplement were - 51 and 62 g, respectively, with no significant difference between the three feeding levels. Greasy wool production increased from 4.7 g/day without supplement to 9.9 g/day at the 600 or 800 g level but the composition of the supplement had no effect. Stocking rate had no effect on animal performance. It was estimated that pasture intake increased slightly with the first 400 g of supplement but fell sharply as the level increased further, with a substitution rate of 1.3. In two experiments, yarded lambs were offered oaten or lucerne hay ad libitum and mixtures of sunflower meal and oats at levels from 400 g/day to ad libitum. Mean daily gain in fasted weight increased from about 140 to about 190 g/day over this range of supplementation and greasy wool production from about 9 to about 10 g/day. In one experiment weight gain and wool production were significantly lower with a 1:6 mixture of sunflower meal and oats than with a 1:2 mixture and the same trend was shown in the other experiment. Measurements of intake showed that the substitution rate for both types of hay was only about 0.5. Comparisons of the animals' estimated requirements and intake in all three experiments indicated that the relatively poor performance of grazing animals was due to the very high substitution rate for grazed pasture at levels of supplement intake above 400 g/day.

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Effect of lupin grain and recently cut lucerne on intake and digestibility of mature weathered herbage by Border Leicester × Merino ewes

Cited by 2 publications

References 7 publications

Effects of a concentrate supplement on the intake and digestion of a low-quality forage by lambs

Effects of a concentrate supplement on the intake and digestion of a low-quality forage by lambs

Responses to supplements by weaned lambs grazing mature pasture or eating hay in yards

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