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Effect of 75% replacement of dietary N by urea and ammonium sulphate on the composition and properties of sheep's milk

Published online by Cambridge University Press:  01 June 2009

G. Tanev
G. Tanev
Affiliation:
Institute of Animal Breeding, Sofia-Kostinbrod, Bulgaria
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Summary

A 23-week trial was conducted using 4 groups each of 6 ewes to study the effects on milk yield and composition of substituting non-protein nitrogen (NPN) for 75 % of the dietary nitrogen. The control group received a winter ration which included silage followed by a summer ration containing lucerne. The test groups received substitutes of urea, ammonium sulphate, or urea+(NH4)2SO4. The milk yield of the test groups was lower (P < 0·01) than that of the control group. Depression of the fat content of the milk reached statistical significance (P < 0·01) in the groups receiving (NH4)2SO4 and urea+(NH4)2SO4. In comparison with the control group, the protein content of the milk was greater in the group receiving urea and smaller in the other 2 test groups. The milks of the test groups had lower amounts of essential amino acids in the free state and higher amounts of non-essential amino acids than did the control milk. Milk-clotting time was increased in the test groups; the increase was greatest (P < 0·01) for the group receiving (NH4)2SO4 and least (P < 0·05) for that receiving urea.

Type
Research Article
Information
Journal of Dairy Research , Volume 40 , Issue 3 , October 1973 , pp. 323 - 328
Copyright
Copyright © Proprietors of Journal of Dairy Research 1973

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References

REFERENCES

Carrez, C. (1908). Annales de Chimie analytique 13, 17.Google Scholar
Carrez, C. (1909). Annales de Chimie analytique 14, 187.Google Scholar
Conrad, H. R. & Hibbs, J. W. (1966). Feedstuffs 38 (41), 60.Google Scholar
Dilanyan, Z. Kh. (1965). Osnovy syrodeliya, p. 28. Moskva: Pishchevaya Promyshlennost'.Google Scholar
Flatt, W. P., Moe, P. W., Oltjen, R. R., Putnam, P. A. & Hooven, N. W. Jr (1969). Publications of European Association of Animal Production no. 12, p. 109. (Proceedings of the 4th Symposium on Energy Metabolism, Jablonna, Poland, 1967).Google Scholar
Gericke, S. & Kurmies, B. (1952). Zeitschrift für Pflanzenernährung, Düngung und Bodenkunde 59, 235.Google Scholar
Hale, W. H. (1955). Sugar Journal 18 (4), 38.Google Scholar
Inikhov, G. S. & Brio, N. P. (1949). Khimicheskii analiz molochnikh produktov. Moskva: Pishchepromizdat.Google Scholar
Jaffe, M. (1886). Hoppe-Seyler's Zeitschrift fur Physiologische Chemie 10, 391.Google Scholar
Johnson, B. C., Hamilton, T. S., Mitchell, H. H. & Robinson, W. B. (1942). Journal of Animal Science 1, 236.CrossRefGoogle Scholar
McLaren, G. A., Anderson, G. C., Tsai, L. I. & Barth, K. M. (1965). Journal of Nutrition 87, 331.CrossRefGoogle Scholar
Nikolchev, G. (1966). Godishnik-Ministerstvo na narodnoto zdrave i socialnite grizhi, Sofia, p. 135.Google Scholar
Platikanov, N., Tanev, I., Hincovski, C. & Solomonov, H. (1961). Tipovi dazhbi i godishni furazhni normi za razlichni vidove i kategorii selskostopanski zhivotni. Sofia: Bulgarska Akademia na Naukite.Google Scholar
Sauer, F. (1938). Tierernährung 10, 2.Google Scholar
Schwarz, G. & Hagemann, B. (1950). Methodenbuch, vol. vi. Radebeul und Berlin: Neumann Verlag.Google Scholar
Scott, W. N., de Paula Assis, F., Gambini, L. B. & de Sousa Lucci, C. (1965–1966). Boletim de Industria 23, 11.Google Scholar
Smith, G. S., Dunbar, R. S., McLaren, G. A., Anderson, G. C. & Welch, J. A. (1960). Journal of Nutrition 71, 20.CrossRefGoogle Scholar
Tanev, G. (1971). Journal of Dairy Research 38, 309.CrossRefGoogle Scholar
Theurer, B., Woods, W. & Poley, G. E. (1968). Journal of Animal Science 27, 1059.CrossRefGoogle Scholar
Todorov, N., Angelova, L., Mineva, P., Kumanov, S. & Ivanov, N. (1969). Zhivotnovudni Nauki 6(6), 31.Google Scholar
Virtanen, A. I. (1966). Science 153, 1603.CrossRefGoogle Scholar
Virtanen, A. I. (1967). Netherlands Milk and Dairy Journal 21, 223.Google Scholar
Woods, W. & Tolman, W. (1966). Feedstuffs 38 (17), 44.Google Scholar