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Animal Science Database

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Abstract

Approximately 20 to 30% of cows diagnosed not pregnant 32 d after timed artificial insemination (TAI) lack a corpus luteum (CL), and cows submitted to a resynchronization protocol in the absence of a CL have about 10% fewer pregnancies per AI (P/AI) than cows with a CL. An understanding of luteal...

Author(s)
Ricci, A.; Carvalho, P. D.; Amundson, M. C.; Fricke, P. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 12, pp 9851-9860
Abstract

The objective of this experiment was to evaluate the reproductive performance and herd exit dynamics of dairy cows managed for first service with programs varying in method of submission for insemination and voluntary waiting period (VWP) duration. Holstein cows from a commercial farm in New York...

Author(s)
Stangaferro, M. L.; Wijma, R.; Masello, M.; Giordano, J. O.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 2, pp 1673-1686
Abstract

This experiment evaluated the reproductive performance, herd exit dynamics, and lactation performance of dairy cows managed with a voluntary waiting period (VWP) of 60 or 88 d. Secondary objectives were evaluating VWP effect on cyclicity status, uterine health, systemic inflammation, and body...

Author(s)
Stangaferro, M. L.; Wijma, R.; Masello, M.; Thomas, M. J.; Giordano, J. O.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2018, 101, 1, pp 717-735
Abstract

Sperm DNA damage affects the conception rate resulting from human assisted reproduction technology. The objective of this study was to adapt the terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay to provide a quality parameter for bull semen based on the detection...

Author(s)
Takeda, K.; Uchiyama, K.; Kinukawa, M.; Tagami, T.; Kaneda, M.; Watanabe, S.
Publisher
Society for Reproduction and Development, Tokyo, Japan
Citation
Journal of Reproduction and Development, 2015, 61, 3, pp 185-190
Abstract

The common practice on most commercial dairy farms is to inseminate all cows that are eligible for breeding, while ignoring (or absorbing) the costs associated with semen and labor directed toward low-fertility cows that are unlikely to conceive. Modern analytical methods, such as machine learning...

Author(s)
Shahinfar, S.; Guenther, J. N.; Page, C. D.; Kalantari, A. S.; Cabrera, V. E.; Fricke, P. M.; Weigel, K. A.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2015, 98, 6, pp 3717-3728
Abstract

The study aimed to evaluate the effect of one or two prostaglandin doses F2α (PGF2a) with or without equine chorionic gonadotropin (eCG) in the follicular dynamics, the preovulatory luteal function, as well as the structural and functional characteristics post-ovulatory of the corpus luteum (CL) in ...

Author(s)
Rodrigues, A. S.; Silva, M. A. A.; Brandão, T. O.; Nascimento, A. B.; Bittencourt, R. F.; Chalhoub, M.; Bittencourt, T. C. B. S. C.; Ribeiro Filho, A. de L.
Publisher
Colégio Brasileiro de Patologia Animal, Rio de Janeiro, Brazil
Citation
Pesquisa Veterinária Brasileira, 2018, 38, 8, pp 1518-1527
Abstract

The aim of this study was to compare the reproductive performance of dairy cows subjected to early (ER) or late (LR) resynchronization programs after nonpregnancy diagnoses based on either pregnancy-associated glycoproteins (PAG) ELISA or transrectal palpation, respectively. In addition, the...

Author(s)
Sinedino, L. D. P.; Lima, F. S.; Bisinotto, R. S.; Cerri, R. L. A.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2014, 97, 8, pp 4932-4941
Abstract

The objectives were to determine the effects of one or three timed artificial insemination (AI) before natural service (NS) in lactating dairy cows not observed for detection of estrus on hazard of pregnancy, days nonpregnant, and 21-days cycle pregnancy rate. A total of 1050 lactating Holstein...

Author(s)
Lima, F. S.; Bisinotto, R. S.; Ribeiro, E. S.; Ayres, H.; Greco, L. F.; Galvão, K. N.; Risco, C. A.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2012, 77, 9, pp 1918-1927
Abstract

Objectives were to determine the effect of reducing the period of follicle dominance in a timed artificial insemination (AI) protocol on pregnancy per AI (P/AI) in Holstein cows. In experiment 1, 165 cows received 2 injections of PGF at 36 and 50 d in milk (DIM). At 61 DIM, cows were assigned...

Author(s)
Santos, J. E. P.; Narciso, C. D.; Rivera, F.; Thatcher, W. W.; Chebel, R. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 7, pp 2976-2988
Abstract

The objectives of this study were to evaluate the effect of reproductive protocols and reproductive tract score on reproductive performance of dairy heifers and economic outcomes of breeding programmes. Holstein heifers (n=534), 13±1 mo of age, were randomly assigned to 1 of 4 reproductive...

Author(s)
Stevenson, J. L.; Rodrigues, J. A.; Braga, F. A.; Bitente, S.; Dalton, J. C.; Santos, J. E. P.; Chebel, R. C.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 9, pp 3424-3438

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