Factors affecting the voluntary intake of food by cows

Campling, R. C.; Freer, M.; Balch, C. C.

doi:10.1079/bjn19610066

Cited by 117 publications

(36 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The straw used in the diets in the present experiment was chopped rather than ground in an attempt to avoid the various complications associated with the use of ground roughages; these complications include increased intake and rate of passage, decreased digestibility, absence of true rumination and a possible limiting effect of hind gut capacity on intake (Campling & Freer, 1966). It is difficult to estimate the VOl.…”

Section: I970mentioning

confidence: 99%

“…The net amount of digestion occurring in the reticulo-rumen was estimated by means of the ligninratio technique (Balch, 1957;Campling, Freer & Balch, 1961); samples of digesta were taken from a point close to the reticulo-omasal orifice, five times daily over a period of 5 d, and were bulked for analysis.…”

Section: Digestibilitymentioning

confidence: 99%

“…The times spent eating, ruminating and resting, and the motility of the reticulum, were recorded as described by Campling & Freer (1966), during periods of 72 h.…”

Section: Behaviourmentioning

confidence: 99%

“…It was considered important to use chopped rather than ground straw and to include in the measurements an assessment of the possible contribution of fill in the intestine to the control of intake of the complete diets. Distension of the intestine has been implicated (Campling & Freer, 1966) in the regulation of intake of ground roughages, although this is not thought to be of any importance in the control of concentrate intake (Freer & Campling, 1963). This paper deals with the physical measurements; concentrations of energy-yielding metabolites in the rumen and in blood will be dealt with subsequently.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Voluntary intake, digestion, rate of passage, amount of material in the alimentary tract and behaviour in cows receiving complete diets containing straw and concentrates in different proportions

Bines¹,

Davey²

1970

Br J Nutr

View full text Add to dashboard Cite

I. Pelleted diets containing concentrates and 0, 20, 40 or 60% chopped straw were fed ad lib. for 5 h daily to four cows. Voluntary intake, digestion and rate of passage of these diets were examined, and also the behaviour of the cows and the amount of material in the rumen before and after feeding.2. Least dry matter (7.5 kg) was consumed when there was no roughage in the diet. When roughage was present, its level had no effect on dry-matter intakes, which were 10.7, I 1-3 and 107 kg for 20, 40 and 60 yo roughage respectively. Digestible energy intakes were greatest with diets containing 20 or 40 % roughage.3. The digestibilities of the dry matter of the four diets were 81, 69, 59 and 55 % in increasing order of roughage content. The proportion of total digestion which occurred in the rumen decreased as the roughage content of the ration increased. The rate of breakdown of cotton threads in the rumen increased as the roughage content of the diet increased. 4.Rates of passage varied greatly between cows and there were no differences between treatments in passage rates through the entire alimentary tract. The diets on which the cows consumed the largest amounts of digestible energy (20 and 40 yo roughage) passed through the rumen more slowly, and through the hind gut more quickly, than the other diets. 5 . The times spent daily eating and ruminating both increased as the proportion of roughage in the diet was increased, but in relation to the amount of dry matter eaten, eating times were lowest with diets containing 20 or 40 % roughage. Time spent ruminating per kg straw eaten decreased with increasing straw content of the diet. Rumen contraction rate during eating was greatest when dry-matter intake was greatest, but during rumination it was similar with all three levels of roughage. 6. Before and after feeding, the amount of digesta and digesta dry matter in the rumen increased as the proportion of roughage in the diet increased. After feeding, there was a highly significant linear relationship between the amount of digesta in the rumen and the digestibility of the diet. 7.In a second experiment, similar diets containing o or 50 yo roughage were given to two cows for 5 or 24 h daily. The 24 h intake expressed as a percentage of 5 h intake was 148 % for the 0% roughage diet, but only 105 yo when the diet contained 50% roughage. 8.The results of these experiments are interpreted as indicating a declining importance of physical factors in the regulation of the intake by cows of a range of diets of increasing digestibility.

show abstract

Section: I970mentioning

confidence: 99%

Section: Digestibilitymentioning

confidence: 99%

“…The times spent eating, ruminating and resting, and the motility of the reticulum, were recorded as described by Campling & Freer (1966), during periods of 72 h.…”

Section: Behaviourmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Voluntary intake, digestion, rate of passage, amount of material in the alimentary tract and behaviour in cows receiving complete diets containing straw and concentrates in different proportions

Bines¹,

Davey²

1970

Br J Nutr

View full text Add to dashboard Cite

show abstract

“…Then the latter concluded that the maximal appetite of animals for feed is determined to a considerable extent by the feed residues present in their digestive tracts. CAMPLING et al 25) showed that the differences in the voluntary intake of hay and straw in cows were explicable on the basis of the differences in the retention time of feed residues in their digestive tract, or the amounts of digesta in the rumen.…”

Section: Discussionmentioning

confidence: 99%

The Relationships between Rumen Load and Diurnal Eating Pattern of Sheep Fed in Various Time of Access to Feed

Hemmi¹

1981

Nihon Chikusan Gakkaiho

View full text Add to dashboard Cite

Four fistulated sheep were offered hay cubes ad lib. for 24, 12, 6 and 3 diurnal eating patterns and the rumen load which were estimated by the torque values of rumen contents were analysed. As the daily time of access to feed was shortened, sheep tried to ingest feed more rapidly with long time for each meal and little rest. However, they could not completely fit their eating activities for given feeding conditions and reduced total daily feed intake. The mean values of daily intake of feed were 2413, 2086, 1869 and 1502g for 24, 12, 6 and 3-hr feedings respectively. The torque values of rumen contents reached the maximum level at the final satiety state (FSS) under all of the four feeding conditions. Regardless of differences in time of access to feed, these torque values at the FSS corresponded equally to 63% of the value of the rumen contents of each sheep estimated by fistula feeding techniques. The characteristics of eating behaviour before and after the PSS (primary satiety state) or FSS were explicable on the basis of the changes in the rumen load. These results seemed to suggest that the daily feed intake and diurnal eating behaviour of the sheep fed roughages are predominantly regulated by the maximum levels of their rumen load. Jpn. J. Zootech. Sci., 52 (3) : [219][220][221][222][223][224][225][226] 1981 Much evidence to show the limiting effects of the rumen contents on the voluntary intake of roughages in ruminants has been provided by a great number of experiments. These results were summarized in various reviews1-3). Transfer of ruminal digesta from a donor 4.5), intraruminal addition of feed6-9), or removal of digesta from the rumen4,5) have all resulted in some compensation in feed intake. EVANS et al.10) reported that particle size, density and dry matter contents changed as the time after feeding elapsed. From the analysis of diurnal feeding behaviour of the sheep in free access, the author has proposed the hypothesis that the distribution of eating activity for the period of twenty-four hours was governed by the diurnal changes in the rumen contents11)

show abstract

Forestomach: Control of Digesta Flow

Deswysen¹

1987

Physiological and Pharmacological Aspects of the Reticulo-Rumen

View full text Add to dashboard Cite

Factors affecting the voluntary intake of food by cows

Cited by 117 publications

References 11 publications

Voluntary intake, digestion, rate of passage, amount of material in the alimentary tract and behaviour in cows receiving complete diets containing straw and concentrates in different proportions

Voluntary intake, digestion, rate of passage, amount of material in the alimentary tract and behaviour in cows receiving complete diets containing straw and concentrates in different proportions

The Relationships between Rumen Load and Diurnal Eating Pattern of Sheep Fed in Various Time of Access to Feed

Forestomach: Control of Digesta Flow

Contact Info

Product

Resources

About