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Animal Science Database

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Abstract

HEAT periods, presence of follicles, and ovulation were observed in a group of 35 heifers on pasture. All animals examined during heat had a follicle present, and in the great majority of cases ovulation had occurred before the 3rd half-day following the end of heat; the data support the opinion...

Author(s)
Werner, G. M.; Casida, L. E.; Rupel, I. W.
Citation
Record of Proceedings. American Society of Animal Production, 1938, pp 54-57
Abstract

THE State has now 5 cooperative units for artificial insemination, including about 5500 cows; the original unit, begun in May 1938, has 240 members with 2600 cows. Insemination rate per pregnancy varies for young as well as mature bulls and among bulls with the same semen density and sperm...

Author(s)
Bartlett, J. W.; Perry, E. J.
Citation
Record of Proceedings. American Society of Animal Production, 1939, pp 243-245
Abstract

ARNOLD, F. Utilization of proved sires and sons of proved sires: 578-579. At present only about 1 sire out of 8 is alive when proved and worthy of further use. There is little chance of increasing the use of proved sires except through their sons, or through programmes designed to prove bulls at an ...

Citation
Journal of Dairy Science, 1940, 23, pp 473-586
Abstract

A development in connexion with departmental reorganization was the establishment of an Agricultural Research Administration in which the Bureau of Animal Industry was grouped with other bureaux having related interests [see V. B. 13. 344, abst. 2307], Active support of the nation's wartime...

Author(s)
Mohler, J. R.
Publisher
Washington, D.C. : Superintendent of Documents.,
Citation
United States Department of Agriculture, Agricultural Research Administration. Report of the Chief of the Bureau of Animal Industry, 1942., 1942, pp 46 pp.
Abstract

DURING the period 1st Dec. 1937-29th Oct. 1940 a total of 295 Jersey, Guernsey, Ayrshire, and Hoi-stein cows and heifers from the University of Nebraska dairy herd, comprising 10 experimental groups of 25 or more ♀♀, were artificially inseminated at various stages of oestrus. Percentage conception...

Author(s)
Trimberger, G. W.; Davis, H. P.
Citation
Research Bulletin. Nebraska Agricultural Experiment Station, 1943, 129, pp 14 pp.
Abstract

A total of 295 dairy cows and heifers was artificially inseminated at different stages of oestrus to determine the effect of time of service upon conception. The results, expressed as percentages of conception from one insemination in the females bred at various stages of oestrus, were as follows:...

Author(s)
Trimberger, G. W.; D'avis, H. P.
Citation
Research Bulletin. Nebraska Agricultural Experiment Station, 1943, 129, pp 14 pp.
Abstract

AFTER reporting some conception rates obtained from natural and artificial mating in Europe and the U.S.A. the author gives the results of his own investigations. Of 3 cows inseminated in 1939, all 3 conceived to the 1st insemination, as did 18 out of 30 cows in further experiments. A table shows...

Author(s)
Kumaran, J. D. S.
Citation
Indian Veterinary Journal, 1944, 21, pp 137-140
Abstract

THE clinical features of the various forms of sterility, the results of post-mortem findings, and the methods of treatment adopted by the author are described. In his experience the commonest breeding irregularity is absence of visible oestrus. The commonest genital abnormality encountered in...

Author(s)
Wright, J. G.
Citation
Veterinary Record, 1945, 57, pp 313-318
Abstract

Experience at artificial insemination centres has shown that temporary infertility is not uncommon in bulls, but that methods whereby this can be overcome have yet to be determined. Fluctuations in the degree of fertility of the bull are of great importance, especially when the bull is mated to...

Author(s)
Dalling, T.; Follet, S. J.; Scorgie, N. J.; Clarke, C. H.; Rees-mogg, G.; Bledisloe.; Viscount.; Gould, G. N.; Gardner, C. H.; Lea, H.; Thomson, L.; Stevens, H.; Smith, G. R. W.; Garner, F. H.; Thompson, F. N.; Porter, J.
Publisher
Lond.,
Citation
Journal of the Farmers' Club, 1945, Part 6, pp 74-88 pp.
Abstract

OVA were collected from 28 heifers and 18 cows which had been artificially inseminated. Cleavage stages are described, diameters and volumes were calculated for each stage, and data are compared with those of other mammalian ova. In 2 cases an ovum was found in the uterus as early as 96 hrs. after...

Author(s)
Hamilton, W. J.; Laing, J. A.
Publisher
Lond.,
Citation
Journal of Anatomy, 1946, 80, pp 194-204

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