Studies in the Digestibility of Herbage

Minson, D. J.; Kemp, C. D.

doi:10.1111/j.1365-2494.1961.tb00215.x

Cited by 34 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present work the adoption of equation (1) based on early season grass may have resulted in some overestimation of digestibility and equations (1), (2) and (3) all yield estimates of digestibility which exceed, by from 4 to 7 digestibility units, estimates based on Holmes andOsman (1960), or Corbett (1960), although agreeing with figures quoted by Woodman and Norman (1932). Equation (1) was based on data obtained during June and July (9th June-23rd July); the application of the regressions of Minson and Kemp (1961) relating faecal N concentrations to digestibility of grass cut in June, July and August to the mean faecal N concentrations obtained for cows, heifers and calves in Experiment 1 produced seasonal effects which did not exceed 1-5 digestibility units. The amount of seasonal bias is therefore unlikely to be very great.…”

Section: Discussionsupporting

confidence: 54%

“…Since this fitted exactly a regression equation calculated in the same field in a preliminary trial with sheep earlier in the same year, the latter was adopted although it probably introduces a seasonal bias (Minson and Kemp, 1961). Regression equations relating OM digestibility to faecal N concentration in the OM were calculated from the data provided by the indoor sheep.…”

Section: Resultsmentioning

confidence: 99%

“…The design of the experiments and their execution were satisfactory as indicated by the low standard errors calculated for faecal output and the N content of the faeces but the estimation of herbage digestibility from faecal nitrogen is liable to many errors to which Minson and Kemp (1961), and Greenhalgh, Corbett and McDonald (1960) have recently drawn attention. In the present work the adoption of equation (1) based on early season grass may have resulted in some overestimation of digestibility and equations (1), (2) and (3) all yield estimates of digestibility which exceed, by from 4 to 7 digestibility units, estimates based on Holmes andOsman (1960), or Corbett (1960), although agreeing with figures quoted by Woodman and Norman (1932).…”

Section: Discussionmentioning

confidence: 98%

See 2 more Smart Citations

The feed intake of grazing cattle. II. The influence of size of animal on feed intake

1961

View full text Add to dashboard Cite

1. Two experiments each with 3 dry cows, 3 heifers and 3 calves were carried out in 1959 and 1960 under uniform continuous grazing conditions on a ryegrass-white clover sward to measure individual feed intake by the chromic oxide-faecal nitrogen method.2. Estimates of digestibility were high (70–82% in organic matter) and there was evidence that calves selected a diet of higher digestibility than cows.3. Mean daily estimates of organic matter intake were for cows (1300 lb. live-weight) 23·5 lb., for heifers (790 lb. live-weight) 20·8 lb. and for calves (450 lb. live-weight) 14·3 lb. Corresponding digestible organic matter intakes were 17·4, 15·3 and 11·0 lb.4. Relationships between digestible organic matter intake and liveweight were calculated and the merits of the exponents 0·62 and 0·73 of liveweight discussed.5. The results were compared with accepted cow equivalent standards and, regardless of the exponent chosen, agreed with the system which adopts higher values for young grazing cattle.

show abstract

Section: Discussionsupporting

confidence: 54%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 98%

See 1 more Smart Citation

The feed intake of grazing cattle. II. The influence of size of animal on feed intake

1961

View full text Add to dashboard Cite

show abstract

“…A very close relationship has often been found to exist between organic-matter digestibility and nitrogen content of faecal organic matter (Greenhalgh & Reid, 1969;Langlands, 1969;Minson & Kemp, 1961). On the basis of our results we may conclude that from the nitrogen content of faecal dry matter it is possible to estimate with fair accuracy the dry-matter digestibility, not only for grass (equation 6) but also for winter rations (equation 3).…”

Section: Discussionsupporting

confidence: 52%

Statistical research on the digestibility in the cow. I. Dry matter and energy

Paquay¹,

Baere²,

Lousse³

1972

J. Agric. Sci.

View full text Add to dashboard Cite

The results obtained for dry matter and energy digestibility with 116 different rations fed to 242 non-pregnant dry cows and 96 laotating cows were studied.With winter rations, dry-matter digestibility (Y) is linearly related to dry-matter intake (X x ) and to the crude fibre content of the dry matter (X 2 ):A similar equation was obtained for energy digestibility (Y):where X 1 represents the energy intake (in 1000 kcal) and X 2 the crude-fibre content.Digestible dry matter or energy can be estimated very accurately from dry matter or energy intake and from crude-fibre content.There is a highly significant linear relation between dry matter or energy digestibility and nitrogen concentration of the faeces, especially with grass.Dry-matter digestibility is also influenced by the physical form of the feeds and by individual factors.

show abstract

“…These data show that at some dates of collection a fairly constant level of herbage digestibility was found in combination with a marked fall in nitrogen content between samples of herbage from upper and lower layers of the sward. Furthermore, the relationship between digestibility and nitrogen content varied considerably at different times of the year, a situation similar to that described for whole swards by Minson and Kemp (6).…”

Section: Nitrogen Content Of Ingested Herbagementioning

confidence: 79%

The Use of Rumen‐fistulated Steers in the Direct Determination of Nutritive Value of Ingested Herbage in Grazing Experiments

Tayler

Deriaz

1963

Grass and Forage Science

View full text Add to dashboard Cite

A rumen‐fistulated steer was used for the manual collection of samples of freshly swallowed herbage, in a grazing‐management experiment on a perennial ryegrass sward. Diurnal and seasonal changes in the in vitro digestibility of the herbage selected by the grazing animal were studied under both strip‐ and continuous‐grazing methods of management. There was no appreciable change in digestibility as the sward was grazed down from upper to lower layers under strip‐grazing management in April and May. In June to October a within‐day fall in digestibility was found, much of which was attributable to an increase in the amount of old dead herbage grazed from the lower regions of the sward. Dead herbage taken in by the grazing steer was considerably lower in digestibility in August than in May. The in vitro digestibility of herbage samples, cut to ground level before and after grazing in a strip‐grazed treatment, fell markedly as the proportion of dead herbage in the sample increased, giving a high negative correlation. In a continuous‐grazing management there was no pattern of diurnal variation, and the seasonal variation in digestibility of the ingested herbage was less than in strip grazing. The implications of these results are discussed in relation to indirect methods of digestibility determination (faecal‐index technique), the measurement of herbage intake, and to some aspects of grazing management.

show abstract

Studies in the Digestibility of Herbage

Cited by 34 publications

References 8 publications

The feed intake of grazing cattle. II. The influence of size of animal on feed intake

The feed intake of grazing cattle. II. The influence of size of animal on feed intake

Statistical research on the digestibility in the cow. I. Dry matter and energy

The Use of Rumen‐fistulated Steers in the Direct Determination of Nutritive Value of Ingested Herbage in Grazing Experiments

Contact Info

Product

Resources

About