A study of the lactation and growth of hill sheep in their native environment and under lowland conditions | The Journal of Agricultural Science | Cambridge Core (original) (raw)

Extract

1. A method is described suitable for the estimation of the milk yield of sheep under natural grazing conditions.

2. The yields obtained from Welsh Mountain sheep in two environments are shown.

3. A close but diminishing relationship is shown to exist between the milk yield of the ewe and the growth of the lamb. Evidence is given of the effect of milk yield at later stages.

4. The estimation of the ewe's milk yield from the weight of the young lamb is discussed. These estimates are used in conjunction with actual milk records in the present study.

5. The ewe's milk yield is shown to be significantly related to nutrition, body weight, udder size and the lamb's birth weight.

6. The relation of milk yield to weight gain during lactation, fleece weight and fleece type were mainly non-significant.

7. From the limited data available, it seems that milk yield has a fairly high repeatability and heritability.

References

Barnicoat, C. R., Logan, A. G. & Grant, A. I. (1949). J. Agric. Sci. 39, 44.Google Scholar

Bettini, T. M. (1952). Riv. Zootec., Firenze, 25 (14), 116.Google Scholar

Bonelli, P. (1950). Relas. Congr. Int. Allev. Ovino. Roma, 2, 219.Google Scholar

Bonsma, F. N. (1939). Univ. Pretoria Publ. Agric. no. 48.Google Scholar

Burris, M. J. & Baugus, C. A. (1955). J. Anim. Sci. 14, 186.Google Scholar

Charletlery, G., Leroy, A. M. & Zelter, S. Z. (1953). C.R. Acad. Agric. Fr. 39, 353.Google Scholar

Cole, L. J. & Kuhlman, A. H. (1929). Bull. Dep. Agric. S. Aust. no.211.Google Scholar

Dasaat, P. & Mason, I. L. (1954). Caryologia, vol. suppl. 1954.Google Scholar

Davies, G. M. (1954). Ph. D. thesis, University of Wales.Google Scholar

Donald, H. P. & McLean, J. W. (1935). N.Z. J. Sci. Tech. 17, 497.Google Scholar

Espe, D. & Smith, V. R. (1952). Secretion of Milk. Ames, Iowa: Iowa State Coll. Press.Google Scholar

Fuller, J. G. & Kleinheinz, F. (1904). Ann. Sep. Wis. Agric. Exp. Sta. no. 21, p. 48.Google Scholar

Gaines, W. L., Davis, H. P. & Morgan, R. F. (1947). J. Dairy Sci. 30, 273.Google Scholar

Gorb, T. V. & Semenchenko, Z. P. (1950). Soviet. Zootech, 5, 52.Google Scholar

Hammond, J. (1927). The Physiology of Reproduction in the Cow. Cambridge.Google Scholar

Hammond, J. (1928). The Growth and Development of Mutton Qualities in the Sheep. Edinburgh: Oliver and Boyd.Google Scholar

Johanson, I. & Hansson, K. (1940). K. Lantbr. Akad. Tidskr. 79, 127.Google Scholar

Lauprecht, E. & Döring, H. (1950). Milchwissenschaft, 5, 383 and 416.Google Scholar

Lush, J. L., Culbertson, C. C. & Hammond, W. H. (1931). Poland China J. 18, no. 6.Google Scholar

Mason, I. L. & Dassat, P. (1954). Z. Tierz. ZuchtBiol. 62, Heft. 3.Google Scholar

Niedig, R. E. & Iddings, E. J. (1919). J. Agric. Res. 17, 19.Google Scholar

Phillips, R. W. (1937). Bull. Mass. Agric. Exp. Sta. no. 339.Google Scholar

Phillips, R. W. & Dawson, W. M. (1937). Amer. Soc. Anim. Prod. p. 298.Google Scholar

Pierce, A. W. (1934a). Aust. J. Exp. Biol. Med. Sci. 14, 187.Google Scholar

Pierce, A. W. (1934b). Bull. Coun. Sci. Industr. Res. Aust. no. 84.Google Scholar

Pierce, A. W. (1938). J. Coun. Sci. Industr. Res. Aust. 11, 229.Google Scholar

Pierce, A. W. (1945). Aust. J. Exp. Biol. Med. Sci. 23, 295.Google Scholar

Ritzmann, E. G. (1919). Tech. Bull. N.H. Agric Sta. no. 14.Google Scholar

Robinson, J. F. (1953). A Survey of Blackface sheep. Publ. Scottish Hill Farm. Res. Committee.Google Scholar

Shrewsbury, C. L., Harper, C., Andrews, F N. & Zelle, M. R. (1942). J. Anim. Sci. 1, 126.CrossRefGoogle Scholar

Snell, M. G. (1933). Proc. Amer. Soc. Anim. Prod. p. 178.Google Scholar

Swett, W. W., Miller, F. W., Graves, R. R. & Creech, G. T. (1932). J. Agric. Res. 45, 577.Google Scholar