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A comparison between a dploid and a tetraploid ryegrass for milk production

Published online by Cambridge University Press:  27 March 2009

M. E. Castle  and
J. N. Watson
M. E. Castle
Affiliation:
The Hannah Dairy Research Institute, Ayr
J. N. Watson
Affiliation:
The Hannah Dairy Research Institute, Ayr
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Summary

Two perennial ryegrass swards – one consisting of S. 24, a diploid variety, and the other of Reveille, a tetraploid variety – were compared in a 20-week grazing experiment with 16 Ayrshire cows in 1968 and again with 12 cows in 1969. Each grass sward was grazed at either a high or a low rate of stoeldng and no other feeds were offered to the cows. On average, the amount of herbage dry matter on offer to the cows was slightly greater on the S. 24 than on the Reveille sward but the contents of total soluble sugars and digestible organic matter were significantly higher in the dry matter of the Reveille than in that of the S. 24. The crude protein contents of the herbage dry matter were similar on the two swards. The mean daily milk yields from cows grazing at the high and the low rates of stocking in 1968 were 14·0 and 15·7 kg/cow respectively on the S. 24 sward and 14·7 and 16·1 kg on the Reveille sward. In 1969 the milk yields from these same treatments were 15·4 and 17·2 kg on the S. 24, and 16·5 and 17·7 kg on the Reveille. The fat content of the milk was not significantly affected by the treatments. In both years the solids-not-fat and the crude protein contents of the milk were higher on the Reveille than on the S. 24 sward, but these differences were significant at the low rate of stocking only. The live weight of the cows did not differ significantly between the two swards. The average output of milk per hectare was approximately 4% higher from the Reveille than from the S. 24 sward but the major factor influencing milk production per hectare was the stocking-rate. On average over the 2 years the output of milk per hectare was 36% higher on the high than on the low rate of stocking. It is suggested that in selecting herbage for milk-production purposes attention should be paid to material with a high digestible organic-matter content and a high content of soluble sugars.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 77 , Issue 1 , August 1971 , pp. 69 - 76
Copyright
Copyright © Cambridge University Press 1971

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References

Alcock, M. B. & Morgan, E. W. (1966). The effect of frequency of defoliation on the yield of mixtures of S. 22 (diploid) and Tetra (tetraploid) Italian ryegrass in early establishment. J. Br. Grassld Soc. 21, 62–4.CrossRefGoogle Scholar
Alder, F. E. (1968). Comparison of diploid and tetraploid ryegrasses in animal-production experiments. J. Br. Grassld Soc. 23, 310–16.CrossRefGoogle Scholar
Alexander, R. H. & McGowan, Mary (1966). The routine determination of in vitro digestibility of organic matter in forages. An investigation of the problems associated with continuous large-scale operation. J. Br. Grassld Soc. 21, 140–7.CrossRefGoogle Scholar
Anon. (1970). Recommended Varieties of Grasses. Farmers leaflet no. 16, National Institute of Agricultural Botany, Cambridge, pp. 24.Google Scholar
Browne, D. (1965). The effect of nitrogen on beef production from reseeded and old permanent pastures. Proc. 1st meeting of the Eur. Grassld Fed., pp. 183–92.Google Scholar
Castle, M. E. (1969). A farm scale grazing trial. Study Conference on Winterkill, West of Scotland Agricultural College, Publication no. 260, p. 39.Google Scholar
Castle, M. E., Drysdale, D. & Watson, J. N. (1968). The effect of stocking rate and supplementary concentrate feeding on milk production. J. Br. Grassld Soc. 23, 137–43.CrossRefGoogle Scholar
Conniffe, D., Browne, D. & Walshe, M. J. (1970). Experimental design for grazing trials. J. agric. Sci., Camb. 74, 339–42.CrossRefGoogle Scholar
Hakkess, R. D. (1965). The effect of seed size on early growth of diploid and tetraploid Italian ryegrass. J. Br. Grassld Soc. 20, 190–3.CrossRefGoogle Scholar
Habkess, R. D. (1966 a). Tetraploid grasses. Scot. Agric. 46, 31–3.Google Scholar
Harkess, R. D. (1966 b). Growth characteristics and productivity of tetraploid Italian ryegrass. Proc. 10th int. Grassld Oongr., pp. 315–18.Google Scholar
Harkess, R. D. & Alexander, R. H. (1969). The digestibility and productivity of selected herbage varieties. J. Br. Grassld Soc. 24, 282–9.CrossRefGoogle Scholar
Hunt, I. V. (1966). Tetraploids. Herbivaria, no. 5, pp. 17–22.Google Scholar
Thomson, D. J. (1965). The voluntary intake of tetraploid and diploid Italian ryegrass by sheep. Anim. Prod. 7, 288.Google Scholar
Wilson, G. F. (1967). Milk production from ryegrass varieties. Proc. N. Z. Grassld Ass., pp. 102–11.CrossRefGoogle Scholar
Wilson, G. F. & Dolby, R. M. (1967). Ryegrass varieties in relation to dairy cattle performance. III. A comparison of the milk yield and composition from a tetraploid and two diploid ryegrass varieties. N. Z. Jl agric. Res. 10, 415–24.CrossRefGoogle Scholar