摘要:

The value of varieties of Italian, hybrid and Westerwold ryegrass for early‐bite production was compared at 32 centres in different environments. The relative performance of Italian ryegrass varieties was fairly consistent from centre to centre over a period of 3 years. Danish and Leda Daehnfeldt Italians produced the most, and S22 the least, early spring production. Good early‐bite and total annual yields were obtained from hybrid ryegrasses. Swards sown in the previous autumn were more winter‐hardy than spring‐sown swards and appeared to be as early in the followi

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00412.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

Two experiments were conducted to study the effect on nutrient loss and feeding value of making hay by different means, using a barn‐drier, a forage‐harvester, a crimper and conventional tedding. Both forage‐harvesting and crimping of the herbage significantly increased the rate of drying, compared with tedding alone. In Exp. 2 this effect enabled the crimped and forage‐harvested hays to be baled for storage 3 days earlier than the tedded hay. The use of the forage‐harvester significantly reduced the yield of herbage compared with conventional mowing. Nutrient losses from cutting until storage were highest for the forage‐harvested hays, the loss of dry matter between cutting and storage in the forage‐harvested hays being 39·9 and 19·3%, respectively, in Expt 1 and 2 with corresponding losses in the conventionally made hays of 7·1% and 9·3%. Crimping the hay resulted in higher nutrient losses than tedding. In Expt 2 there was a loss of dry matter of 17·5% in the conventionally made hay during an 18‐week storage period, compared with 3·6% in barn‐dried hay, 10·8% in forage‐harvested hay and 8·8% in crimped hay.In Expt 2, in which digestibility determinations were made, conservation decreased the total digestible nutrients and starch equivalent in all treatments. The use of the barn‐drier gave the most efficient conservation of total digestible nutrients, followed by the crimped, forage‐harvested and conventional treatments in that order. The starch equivalent values of hays made from the same sward were 43·0 when barn‐dried, 39·8 when crimped, 38·6 after fora

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00413.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

An experiment to determine the effect of applying high levels of N on the seed yield of S37 cocksfoot is described. Increasing the rate of application in the range 174–1044 Ib N/ac/annum did not substantially increase yield, except where 1044 Ib N was applied in monthly lots in 1960–1; in some instances yield was significantly reduced by increased N application, apparently as a result of increased frost susceptibility. It is concluded that an application of about 174 lb N/ac/annum is the maximum desirable if there is a danger of fr

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00414.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

The botanical and chemical composition of herbage collected from sheep fitted with oesophageal fistulae was compared with the composition of herbage offered and rejected in pen feeding trials. The sampling variance of macerated botanical samples compared favourably with expected values from a binomial distribution. High correlations were obtained between actual and calculated values for soluble carbohydrates, crude protein and cellulose in fistula samples.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00415.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

Recent publications dealing with the efficiency of utilization of dietary energy by ruminants suggest that metabolizable‐ and net‐energy values may be calculated with reasonable precision from digestible‐energy values. Use has been made here of existing data to estimate the metabolizable‐energy (M. E.) and net‐energy values for maintenance and fattening (N. E.mand N. E.f) of 5 samples of barn‐dried hay of knownin vivodigestibility, firstly to provide such figures for good quality barn‐dried hays and, secondly, to illustrate a method of estimating energy values for hays that might be useful for routine advi

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00416.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

The digestible crude protein percentage (DCP) of 218 different feeds derived from 16 tropical grasses and 8 tropical legumes containing 2·2 to 25·3% crude protein (CP) was Treasured with sheep. DCP was closely related to CP (r =· 0·979) and could be predicted from the equation DCP=O·899 CP‐3·25 (SE estimate · 0·84). Predicted values for tropical grasses and legumes were similar to, but more variable than, those calculated from a similar equation derived from temperate pasture species. It was suggested that CPper seis a useful criterion for selecting tropical pasture plants when directin vivomeasurements of DCP cannot be

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00417.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00418.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

Survey data collected during a grassland‐recording investigation showed a strong positive correlation between nitrogen input and the output of utilized starch equivalent per acre. At the levels of output covered, sward type was not very important in relation to total yield. Herbage species were important for other reasons and the choice of seeds mixtures should be determined by factors such as earliness and lateness of growth and resistance to disease and drought. The survey showed that well‐managed ley and permanent pasture are both capable of producing at a high level. A disturbing feature of the results was the low production of most spring resowings, primarily as a result of poor management.Althoughthe records were obtained from an above‐average group of farms, the results have general application. Potential responses to fertilizers may be even greater on less intensive farms, especially with regard to phosphate and potash. However, the level of production of a field will always depend finally on the level of management exercised by the farmer hi

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00419.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00420.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

Two different sizes of seed of a tetraploid and a diploid Italian ryegrass were sown in pure stands. Harvests were made at frequent intervals from 14 to 54 days after sowing, the root‐and shoot‐yields and numbers of leaves and tillers being recorded at each harvest. The results suggest that seed sizeper sehas little influence on leaf‐ and tiller‐numbers and that large seed increases yield potential only during the first few weeks of

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1965.tb00421.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY