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Abstract

This study assessed the effects of management factors and weather at artificial insemination (AI) on fertility rate in the Florida goat breed based on 7621 artificial inseminations from 47 farms in Spain. Overall, fertility rate was 55%. Farm (P<0.0001), month (P<0.01), number of previous kiddings (P<0.05), milk production at AI (P<0.05), interval between last kidding and AI (P<0.0001), the person responsible for selecting animals for AI (P<0.05), progestagen dose (P<0.001), eCG dose (P<0.0001), sperm dose (P<0.05), site of insemination (P<0.001), incidences at AI (P<0.0001), fulfillment of AI timing schedule (P<0.0001), buck (P<0.0001), and technician (P<0.001) had a significant effect on fertility rate. Mean and maximum temperatures (T) (P<0.001) and solar radiation (SR) on the day of AI differed significantly between does that became pregnant and those that did not. After meteorological data were converted to categorical variables as deciles, the proportions of does that became pregnant were significantly higher among inseminations that were performed when...

Author(s)
Arrébola, F.; Sánchez, M.; López, M. D.; Rodríguez, M.; Pardo, B.; Palacios, C.; Abecia, J. A.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Small Ruminant Research, 2016, 137, pp 47-52
Abstract

The objective was to evaluate the individual and combined effect of anovulation and cytological endometritis (CTE) on the reproductive performance of dairy cows. A total of 1,569 cows from 3 data sets were used. In data set 1, 403 Holstein cows from 5 dairies in New York were used. In data set 2,...

Author(s)
Vieira Neto, A.; Gilbert, R. O.; Butler, W. R.; Santos, J. E. P.; Ribeiro, E. S.; Vercouteren, M. M.; Bruno, R. G.; Bittar, J. H. J.; Galvão, K. N.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 9, pp 5415-5425
Abstract

We evaluated the effect of shortening the dry period (DP) on milk and energy-corrected milk (ECM) yields, milk components, colostrum quality, metabolic status, and reproductive parameters. Primiparous (n=372) and multiparous (n=400) Israeli Holstein cows from 5 commercial dairy herds were subjected ...

Author(s)
Shoshani, E.; Rozen, S.; Doekes, J. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 5, pp 2909-2922
Abstract

Author(s)
Lima, F. L.; Vieira Neto, A.; Martinez, N. M.; Risco, C. A.; Galvão, K. N.; Santos, J. E. P.
Publisher
American Association of Bovine Practitioners, Stillwater, USA
Citation
Proceedings of the 46th Annual Conference of the American Association of Bovine Practitioners, Milwaukee, Wisconsin, USA, 19-21 September 2013, 2014, pp 136
Abstract

Dairy heifers were used to compared the effects of two timed AI+controlled internal drug release (CIDR) protocols (5-day vs. a modified 7-day) on: (1) luteal regression to initiate a new ovarian follicular wave; (2) ovarian response to the initial GnRH injection; and (3) pregnancy outcomes....

Author(s)
Mellieon, H. I., Jr.; Pulley, S. L.; Lamb, G. C.; Larson, J. E.; Stevenson, J. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 78, 9, pp 1997-2006
Abstract

Background: Results regarding the use of bovine somatotropin for enhancing fertility in dairy cattle are variable. Here, the hypothesis was tested that a single injection of a sustained-release preparation of bovine somatotropin (bST) during the preovulatory period would improve pregnancy success...

Author(s)
Bell, A.; Rodríguez, O. A.; Castro e Paula, L. A. de; Padua, M. B.; Hernández-Ceró, J.; Gutiérrez, C. G.; Vries, A. de; Hansen, P. J.
Publisher
BioMed Central Ltd, London, UK
Citation
BMC Veterinary Research, 2008, 4, 22, pp (26 June 2008)
Abstract

During July-September in Northern Florida, USA [date not given], Holstein cows (50-120 days postpartum) were randomly assigned to 1 of 3 groups: (1) artificial insemination (AI, n = 84); (2) embryo transfer using embryos collected from superovulated donors (ET-DON, n = 48); or (3) embryos produced ...

Author(s)
Drost, M.; Ambrose, J. D.; Thatcher, M. J.; Cantrell, C. K.; Wolfsdorf, K. E.; Hasler, J. F.; Thatcher, W. W.
Citation
Theriogenology, 1999, 52, 7, pp 1161-1167
Abstract

In 3 experiments, the efficacy of timed artificial insemination (AI) and β-carotene supplementation for improvement of reproduction and milk yield were studied on 2 farms in Northern and Southern Florida. Experiments 1 and 2 were conducted during the hot months (May-August and August-September...

Author(s)
Aréchiga, C. F.; Staples, C. R.; McDowell, L. R.; Hansen, P. J.
Citation
Journal of Dairy Science, 1998, 81, 2, pp 390-402
Abstract

ARAVE, C. W., and LAMB, R. C. Relationship between a dairy cattle production index and genotype at the serum transferrin and four milk protein loci: 666.
ARORA, K. K., and FREEMAN, A. E. Environmental correlation between paternal half-sibs for milk and milk fat production: 655.
BATRA, T. R.,...

Citation
Journal of Dairy Science, 1970, 53, pp 631-688

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