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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

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

To compare 2 hormonal protocols for submission of lactating dairy cows for timed artificial insemination (TAI), nonpregnant lactating Holstein cows (n=269) >60 d in milk were randomly assigned to each of 2 treatments to receive TAI (TAI=d 0). Cows assigned to the first treatment (Ovsynch, n=134)...

Author(s)
Navanukraw, C.; Redmer, D. A.; Reynolds, L. P.; Kirsch, J. D.; Grazul-Bilska, A. T.; Fricke, P. M.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2004, 87, 5, pp 1551-1557
Abstract

Poor detection of oestrus, still a major problem in the dairy industry, has prompted the development of electronic oestrous detection technologies. One of the features of oestrous behaviour is a marked increase in walking activity. The objectives of the present study were to evaluate the effects of ...

Author(s)
López-Gatius, F.; Santolaria, P.; Mundet, I.; Yániz, J. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2005, 63, 5, pp 1419-1429
AbstractFull Text

The has been no report published on the economical losses associated with errors in oestrus detection in cows under Iranian intensive dairy management. The study was conducted to determine the accuracy of oestrus detection by farmers using artificial insemination in Shiraz dairy farms. Milk samples ...

Author(s)
Kafi, M.; Zibaei, M.; Rahbari, A.
Publisher
Shiraz University Press, Shiraz, Iran
Citation
Iranian Journal of Veterinary Research, 2007, 8, 2, pp 131-137
Abstract

A total of 58 Holstein cows from a commercial dairy herd which were unable to get pregnant after repeated services were induced into lactation. Cows were assigned to two oestrous synchronization protocols: ovsynch (n=20; GnRH at day 7 before and 48 h after PGF, with fixed artificial insemination...

Author(s)
Leyva, C.; Mellado, M.
Publisher
Garuda Scientific Publications, Izatnagar, India
Citation
Journal of Applied Animal Research, 2009, 35, 1, pp 25-28
Abstract

The objective was to investigate the associations between body condition scores (BCS) and daily body weight (BW) in the first 150 d of lactation (DIM) and reproductive performance in high-producing dairy cows. Data included automated daily BW measurements and BCS of 2,020 Israeli Holstein cows from ...

Author(s)
Straten, M. van; Shpigel, N. Y.; Friger, M.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2009, 92, 9, pp 4375-4385
Abstract

The objectives of this study were to evaluate the effect of administering 500 mg of recombinant bovine somatotropin (bST) every 10 d on ovulatory responses, estrous behavior, and fertility of lactating Holstein cows. Lactating dairy cows were assigned to 1 of 2 treatments: a control with no...

Author(s)
Rivera, F.; Narciso, C.; Oliveira, R.; Cerri, R. L. A.; Correa-Calderón, A.; Chebel, R. C.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 4, pp 1500-1510
AbstractFull Text

The objective of the study was to evaluate the uterine histopathological changes in Holstein dairy cows, within the range of 90-145 day in milk, with or without clinical history of reproduction system disorders. Lactating Holstein cows (n=133) with (n=92, 69.17%) or without (n=41, 30.82%) recorded...

Author(s)
Garoussi, M. T.; Sasani, F.; Hovareshti, P.
Publisher
Ferdowsi University of Mashhad, Mashhad, Iran
Citation
Iranian Journal of Veterinary Science and Technology, 2010, 2, 2, pp 101-108
Abstract

Reduced reproductive efficiency has been reported in high-producing dairy cows. Sources of reproductive inefficiency include decreased expression of estrus, increased diameter of the ovulatory follicle and reduced fertility when cows are inseminated after estrus, increased incidence of double...

Author(s)
Wiltbank, M. C.; Sartori, R.; Vasconcelos, J. L. M.; Nascimento, A. B.; Souza, A. H.; Cunha, A. P.; Gumen, A.; Sangsritavong, S.; Guenther, J. N.; Lopez, H.; Pursley, J. R.
Publisher
Nottingham University Press, Nottingham, UK
Citation
Reproduction in domestic ruminants VII. Proceedings of the Eighth International Symposium on Reproduction in Domestic Ruminants, Anchorage, Alaska, September 2010, 2010, pp 231-245

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