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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

This is a review of the physiology and endocrinology of the estrous cycle and how ovarian physiology can be manipulated and controlled for timed artificial insemination (TAI) in beef and dairy cattle. Estrus detection is required for artificial insemination (AI), but it is done poorly in dairy...

Author(s)
Colazo, M. G.; Mapletoft, R. J.
Publisher
Canadian Veterinary Medical Association, Ottawa, Canada
Citation
Canadian Veterinary Journal, 2014, 55, 8, pp 772-780
Abstract

Adams, C. R., Becker, D. E., Terrill, S. W., Norton, H. W., and Jensen, A. H. Rate of ovulation and implantation in swine as affected by dietary protein: 1245. Alliston, C. W., and Ulberg, L. C. Early pregnancy loss in sheep at ambient temperatures of 70° and 90° F. : 1316. Anderson, D. E., and...

Citation
Journal of Animal Science, 1960, 19, pp 1216-1339
Abstract

ALEXANDER, M. H. A study of the inheritance of persistency in milk production: 375.ALEXANDER, M. H. Length of gestation in the five major breeds of dairy cattle: 377-378.ALMQUIST, J. O., and PRINCE, P. W. The effect of a combination of penicillin, streptomycin and sulfanilamide upon the fertility...

Citation
Journal of Dairy Science, 1950, 33, pp 375-412
Abstract

AKINS, E. L., LTJDWICK, T. M., RICKARD, H. E., RADER, E. R., and ETGEN, W. M. Association of certain type evaluations and type scores of first-lactation Holstein females: 748. ALMQTJIST, J. O., AMANN, R. P., and O'DELL, W. T. Sperm reserves of dairy bulls as determined by depletion trials and...

Citation
Journal of Dairy Science, 1958, 41, pp 701-751
Abstract

Gonadotropin-releasing hormone (GnRH) has been used to warrant the success of artificial insemination by accurately timing occurrence of ovulation. In practical conditions, GnRH may be administered too late, after ovulation, with an eventual reduction in pregnancy rate. The aim of this study was to ...

Author(s)
Taponen, J.; Rodríguez-Martínez, H.; Katila, T.
Publisher
Elsevier Science B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2000, 64, 3/4, pp 161-169
Abstract

Numerous treatments and protocols have been used to control the reproductive cycle in cattle, with varying effectiveness and many involving the administration of steroid hormones. Steroid hormones, such as estradiol, are perceived as having a negative impact on consumer health. This internationally ...

Author(s)
Yapura, M. J.; Zwiefelhofer, E. M.; Pierson, R. A.; Adams, G. P.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 112, pp 18-25
Abstract

The association between conception rate at first service and numbers of follicles developed during a follicular wave was examined in 102 suckled beef cows and 14 heifers. Follicular development was monitored using ultrasonography for either two (trial 1) or three (trial 2) consecutive oestrous...

Author(s)
Starbuck-Clemmer, M. J.; Hernandez-Fonseca, H.; Ahmad, N.; Seidel, G.; Inskeep, E. K.
Publisher
Blackwell Publishing, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2007, 42, 4, pp 337-342
Abstract

Recent estrous synchronization research has aimed to develop reliable protocols that: (1) rely solely on fixed-timed artificial insemination (TAI); (2) require a maximum of three animal handlings; and (3) are successful in estrous-cycling and non-cycling females. In cows, insertion of an...

Author(s)
Lamb, G. C.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Bovine Practitioner, 2010, 44, 1, pp 28-35
Abstract

No significant breed or seasonal differences were found for length of oestrus and time of ovulation after end of oestrus among Ayrshires, Guernseys, Jerseys and Holsteins.
Duration of oestrus of 17.8 hrs. for 86 cows was significantly longer than the average of 15.3 hrs. for 46 heifers. The cows ...

Author(s)
TRIMBERGER, G. W.
Citation
Research Bulletin. Nebraska Agricultural Experiment Station, 1948, 153, pp 26 pp.

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