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Animal Science Database

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Abstract

The objectives were to compare the effects of 2 methods of presynchronization and 2 lengths of proestrus on fertility of grazing dairy cows subjected to a 5-d timed artificial insemination (AI) protocol at initiation of breeding season. Lactating dairy cows (n=1,754) from 3 seasonal grazing farms...

Author(s)
Ribeiro, E. S.; Monteiro, A. P. A.; Lima, F. S.; Ayres, H.; Bisinotto, R. S.; Favoreto, M.; Greco, L. F.; Marsola, R. S.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 5, pp 2513-2522
Abstract

This is the very first report that suggests high pregnancy rates can be obtained with use of the Doublesynch protocol in anestrous dairy cows. Recently, a new synchronization method has been developed (Doublesynch) that resulted in synchronized ovulations both after the first and second...

Author(s)
Öztürk, Ö. A.; Cİrİt, Ü.; Baran, A.; Ak, K.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2010, 73, 5, pp 568-576
Abstract

Cattle that are not pregnant to first fixed-time artificial insemination (TAI) may be resynchronized for a second TAI if they are found nonpregnant at pregnancy diagnosis. The specific interval between first and second TAI ranges from 4 to 8 wk. The selected interval depends on the available method ...

Author(s)
Green, J. C.; Okamura, C. S.; Mathew, D. J.; Newsom, E. M.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 12, pp 5668-5672
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

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

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

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