摘要:

AbstractEarly‐weaned lambs were offered rations of conventional concentrate, dried grass and dried white clover pelletsad libitumfor 52 days.In vivoOM digestibility coefficients of concentrate, grass and clover were 80.0, 53.4 and 66.6% respectively. Dry matter intake of dried grass was similar to that of concentrates but supported significantly lower (P<0.001) daily gains (0.18 kg). Supplementation of dried grass with an equal proportion of dried clover significantly increased (P<0.05) DM and DOM intake and daily gains. Daily gains by lambs offered the 1:1 grass:clover diet (0.29 kg) were similar to gains by lambs offered either dried clover (0.30 kg) or concentrates (0.30 kg

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00779.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThe sulphur concentrations in herbage samples from the plots of a long‐term fertilizer experiment have been examined in relation to levels of fertilizers applied. Sulphur applied as superphosphate increased herbage sulphiir concentrations whereas reduction in concentrations were observed with applications of nitrogen as ‘Nitro‐chalk’ and potassium as potassium chloride. Reduction in sulphur concentration occurred most likely as a result of increased dry matter production brought about by the added nitrogen and potassium, effectively diluting the sulphur content of the plant material. Potassium chloride may also have exerted an anion‐antagonistic effect on sulphate uptake by the plants. Levels of soil extractable sulphate were low in plots receiving no sulphur as fertilizer and high levels of nitrogen applied to these plots resulted in wide nitrogen: sulphur ratios in the herbage. Most of the sulphur applied to the soil in the spring was leached out of the topsoil by the end of the growing season.In some areas of Britain it seems possible that optimum utilization of applied nitrogen may only be obtained where sulphur is also added to

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00780.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractForty‐eight Friesian steers with an average live‐weight of 168 kg were given hayad libitumsupplemented with 0, 0.6, 1.2, 1.8, 2.4 and 30 kg artifically dried grass or concentrates.In vitrodry matter digestibility of hay was 55%. Liveweight gain increased with each successive increase in the level of supplementation. The intake of hay decreased but the total DM was greatest at the higher level of supplementation. The results suggest that dried grass pellets combine well with hay and may be used to replace concentrates. It was shown that 1 kg of either dried grass or concentrates given as a supplement to hay fedad libitum, will increase the live‐weight gain by 0.16 kg d−1and decrease hay intake by 0.25

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00781.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractEstablished swards of two diploid and two tetraploid red clover varieties sown pure received 0, 75, 150, 225 or 300 kg ha−1N fertilizer and were cut three times in June, August and October 1971. The total yields of herbage DM for red clover varieties ranged from 8.01 to 11.32 t ha−1; swards sown with tetraploids Hungaropoly and Hera Pajbjerg were superior by 25% in DM yield and 23% in CP yield. The red clover contribution to these total yields of DM ranged from 6.05 to 10.69 t ha−1; tetraploid clovers outyielded diploids by 42% in DM yield and 39% in CP yield.The mean effect of N level on yield and on compositional attributes was slight. Total yields of herbage DM, averaged over all varieties, ranged from 9.50 to 10.22 t ha−1and of total herbage CP from 1.76 to 1.91 t ha−1. The influence of N level on the red clover contribution was negligible. DM yields ranged from 8.54 to 8.72 t ha−1and CP yields from 1.60 to 1.64 t ha−1.Superiority of tetraploid clovers over diploids was again confirmed. Red clover swards sown pure can give high yields without the application of

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00782.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractHungaropoly tetraploid broad red clover was sown at seed rates of 6, 12 or 18 kg ha‐1on six dates from April to September 1971. Three crops were harvested in 1972 and one in June 1973.In 1972, total herbage dry matter yields ranged from 5.22 to 12.22 t ha‐1and red clover dry matter yields from 3.61 to 11.92 t ha‐1when meaned over all seed rates. April to July sowing dates gave significantly higher yields than later sowings. In general, August and September sowings gave the lowest red clover contents in a range from 63.2 to 96.5%, the highest digestibilities within a range 61.9 to 65.0% and the lowest crude protein contents in a range 15.5 to 17.3%.The influence of seed rate was less marked than sowing date. Mean annual yields of total herbage dry matter increased from 9.88 to 10.85 t ha−1as seed rate was increased from 6 to 18 kg ha−1. Red clover dry matter yields and contents of red clover and crude protein in the total herbage also followed this trend.The sowing date effects on total herbage yield and content of red clover did not persist into the second harvest year but the seed rate effects were still noticeable.Plant numbers in spring the first harvest year and hence percentage survival from sowing were depressed by late sowing; plant numbers rose but percentage survival declined as seed rate was increased. The seed rate effects on plant population persisted until spring of the second harvest year but sowing date effects did not.Better stands of red clover were obtained from sowings made between April and June, when a seed rate of 12 kg ha−1was adequate. The adverse effects of late sowing cannot be fully compensated by raising seed rates of clover. There was a significant interaction between seed rate and date of sowing. For April‐May sowings, seed rate was not critical. Thereafter, a linear effect of seed rate on yield wa

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00783.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThree castrated male sheep fitted with rumen and duodenal re‐entrant cannulae were used in a 3×3 Latin Square experiment to investigate the digestion of three diets of red clover silage with supplementary concentrates containing barley or barley and groundnut meal or barley and urea. The supplements were designed to be isocaloric and the groundnut meal and barley‐urea mixtures to be isonitrogenous.There were no significant (P>0.05) differences between treatments in the digestibility of organic matter (mean value 71.2%) or in the percentage of dietary organic matter digested in the stomach (mean value 53.6%) and diiferences between treatments in the concentrations of total and individual short‐chain fatty acids in the rumen were small. The nitrogen intake for the barley treatment was 19.41 g/d and that for the groundnut meal and barley‐urea treatments were 23.36 g/d and 23.05 g/d respectively. Corresponding figures for the duodenal flows of nitrogen were 21.97 g/d, 21.48 g/d and 21.14 g/d and for the faecal losses of nitrogen were 7.09 g/d, 6.98 g/d and 6.92 g/d. As a consequence, although the diets supplied quite different amounts of digestible crude protein they supplied similar amounts of crude protein digested in the in

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00784.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractPerennial ryegrass (Lolium perenne) swards were given annual applications in six equal instalments at 21‐day intervals of either 100, 400 or 700 kg ha−1N in 1973 and 1974. Ewes with twin lambs were rotationally grazed on these areas. The nitrate‐N content of the grass was measured immediately before grazing. Blood samples were taken at regular intervals from the ewes and lambs to estimate blood methaemoglobin and certain plasma mineral concentrations. A maximum nitrate‐N concentration of of 0.67% in the herbage dry matter was recorded but no adverse effect of N fertilizer was found in terms of the blood constituents or growth of the sheep, or in the carcase quality of th

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00785.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

AbstractThe extent of post‐defaecation redistribution of faeces by cattle in a grazed pasture was determined by adding to dung pats a pigment which is fluorescent in ultra‐violet light. Traces of faeces which would normally not be detected were located under ultra‐violet irradiation at night. More traces were redistributed from dung pats situated in areas where stock congregated than from dung pats in other areas of paddocks. Most traces occurred at distances of up to 2 m from each indicator dung pat treated with the pigment. The area of sward affected by faeces was over 100 times the area of individual dung pats. It is suggested that the distribution of infective parasitic larvae will follow the distribution of the traces rather than simply that of the dung pats. Grazing behaviour may also be affected by contamination of herbage by traces of f

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00786.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

Book Reviewed in This ArticleMaize Growers' HandbookEdited by G. M. Milboum. 3rd edition.

ISSN:0142-5242    

DOI:10.1111/j.1365-2494.1976.tb00787.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY