The effect of age and live-weight on the feed intake of grazing wether sheep

Hadjipieris, G.; Jones, GB; Holmes, W.

doi:10.1017/s0003356100025769

Cited by 11 publications

(4 citation statements)

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“…However, it should be recognized that the age (Greenhalgh and Reid, 1973;Hadjipieris et al, 1965) and fatness (Bines et al, 1969;Donnelly et al, 1974;Schinkel, 1960) of the animals may affect voluntary intake and using old and/or fat sheep could have led to a different result. However, it should be recognized that the age (Greenhalgh and Reid, 1973;Hadjipieris et al, 1965) and fatness (Bines et al, 1969;Donnelly et al, 1974;Schinkel, 1960) of the animals may affect voluntary intake and using old and/or fat sheep could have led to a different result.…”

Section: Discussionmentioning

confidence: 99%

“…The sheep ate on average 22/;; more herbage DM per unit Iiveweight than the cows. However, it should be recognized that the age (Greenhalgh and Reid, 1973;Hadjipieris et al, 1965) and fatness (Bines et al, 1969;Donnelly et al, 1974;Schinkel, 1960) of the animals may affect voluntary intake and using old and/or fat sheep could have led to a different result. No significant relationship was found between herbage intake and digestibility and this agrees with other reports that at high levels of digestibility there may not be any relationship (Hutton, 1962;.…”

Section: Discussionmentioning

confidence: 99%

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Relationship between digestibility and faecal nitrogen in sheep and cows offered herbage ad libitum

Thomas

Campling

1976

Grass and Forage Science

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A comparison was made of the digestibility, voluntary intake and concentration of N in faecal organic matter in castrated male sheep and non-lactating cows offered herbage ad libitum. The sheep ate 22% more herbage DM per kg liveweight than the cows. In general, the sheep and cows digested the organic matter of the herbage to the same extent, although on two occasions significantly higher digestibilities were observed in cows than in sheep. Similar concentrations of N in faecal organic matter in sheep and cows were matched by similar digestibilities of herbage organic matter. Regression equations relating herbage organic matter digestibility to faecal N concentration were not significantly different between sheep and cattle.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Relationship between digestibility and faecal nitrogen in sheep and cows offered herbage ad libitum

Thomas

Campling

1976

Grass and Forage Science

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“…Marked changes in O.M. intake as the digestibility of the diet changes within the range 70-80 % can also be demonstrated from the results of experiments in which swards were grazed once only (Hadjipieris, Jones & Holmes, 1965;Hodgson & Wilkinson, 1967), or in which cut herbage was fed to housed stock (Osbourn el al. 1966).…”

Section: Live Weight and Herbage Consumptionmentioning

confidence: 96%

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

Hodgson

1968

J. Agric. Sci.

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Nitro-chalk was applied to S.23 ryegrass swards, at approximately monthly intervals, at two contrasting levels in 1961 and three levels in 1962. Steer calves, 3-6 months old, grazed in rotation round a series of four paddocks on each treatment. Paddocks were trimmed and fertilizer applied after each grazing. The herbage intakes of the calves were determined on three occasions in 1961 and four occasions in 1962. Faecal output was estimated by chromic oxide dilution. In vitro digestibility determinations were carried out on samples of herbage clipped from the swards.There was a close linear relationship between the digestibility of the herbage and the amount eaten, over the full range of digestibility encountered (68-82 %). Regression equations calculated within seasons and fertilizer levels, and within years, did not differ significantly. The regressions of faecal output on herbage digestibility were not significantly different from zero.The observed relationship between herbage digestibility and herbage intake may reflect (a) the greater sensitivity of young ruminants than adult stock to changes in the digestibility of the diet, and (6) the reduced importance of the chemostatic control of food intake, except at very high levels of digestibility, in young rapidly growing animals.

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“…undertaken to examine further the intake of graz-Hadjipieris, Jones & Holmes (1965) and Arnold ing sheep varying in live weight, age, breed and pre-(1966) observed higher intakes per unit live weight vious nutritional history. In Exp.…”

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confidence: 99%

The feed intake of grazing sheep differing in age, breed, previous nutrition and live weight

Langlands

1968

J. Agric. Sci.

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Two flocks of Merino wethers ranging in age from 3 to 87 months grazed a poor (L) or high (H) quality pasture for 3 months. The flocks were then combined, and intake was estimated while the sheep grazed four different pastures in succession. In a second experiment, flocks of Merino, Border Leicester, Southdown and Dorset Horn ewes of varying ages grazed in succession six pastures on which intakes were estimated and live weights recorded. The digestibility of the diet selected, as estimated from the faecal nitrogen concentration, declined with age by 0-053 units per month in Exp.(2) and curvilinearly in Exp. (1). In both experiments faecal output of sheep of similar breed receiving similar treatments increased with age to approximately 3 years and declined thereafter. In neither experiment was there a significant allometric relationship between intake and live weight.The intake of the L group was consistently greater than that of the H group when both groups grazed together. The differences were correlated with the quantity of green feed available. The faecal output of Dorset Horns, Merinos, Southdowns and Border Leicesters at 28-7 months of age was calculated to be 451, 402, 346 and 588 g per day respectively in Exp. (2). Mean digestibility of the diet selected estimated by the faecal nitrogen procedure was 65-1, 63-0, 64-7 and 64-5 units at 28-7 months for the Dorset Horns, Merinos, Southdowns and Border Leicesters respectively. Differences between breeds in faecal output and in the digestibility of the diet were significant.It is frequently assumed that intake of grazing lated exponents of 0-82 ±0-13 and 0'91±0-14 for animals varies with some function of live weight, the relationship between organic matter intake and and the allometric equation, Y = aW b where Y is live weight of penned and grazing Blackface, intake and W is live weight has been used to de-Border Leicester x Blackface, Shetland and Cheviot scribe such a relationship (e.g. Holmes, Jones & sheep varying in age from 1 to 2 years. A negative Drake-Brockman, 1961). It seems unlikely that relationship between intake and live weight for any single relationship will be generally applicable sheep varying in condition was reported by Allden since differences in live weight may result from & Scott Young (1964) who observed that grazing differences in age, in breed and in the previous level sheep which had been subjected to a low plane of of nutrition. In addition differences in pasture nutrition consumed up to 20% more feed than a availability may limit the degree to which sheep control group. can express potential differences in voluntary Two experiments are reported here which were intake.undertaken to examine further the intake of grazHadjipieris, Jones & Holmes (1965) and Arnold ing sheep varying in live weight, age, breed and pre-(1966) observed higher intakes per unit live weight vious nutritional history. In Exp. (1), two flocks of by young than by adult sheep, although Arnold Merino wethers ranging in age from 7 to 91 months (1966) found that the...

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The effect of age and live-weight on the feed intake of grazing wether sheep

Cited by 11 publications

References 5 publications

Relationship between digestibility and faecal nitrogen in sheep and cows offered herbage ad libitum

Relationship between digestibility and faecal nitrogen in sheep and cows offered herbage ad libitum

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

The feed intake of grazing sheep differing in age, breed, previous nutrition and live weight

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