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Animal Science Database

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Abstract

An experiment was designed to evaluate the effect of extending duration of the presynchronization treatment in a long-term progestin-based estrus synchronization protocol. Heifers were assigned to either an 18 d (Day 0-18) or 14 d (Day 4 to Day 18) CIDR® treatment (1.38 g progesterone controlled...

Author(s)
Knickmeyer, E. R.; Thomas, J. M.; Locke, J. W. C.; Bonacker, R. C.; Ciernia, L. A.; Ketchum, J. N.; Ellersieck, M. R.; Poock, S. E.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2019, 136, pp 66-71
Abstract

Improving artificial insemination (AI) pregnancy rates in replacement heifers improves the genetic advancement within a herd. Heifers that have completed at least three estrous cycles prior to breeding have greater pregnancy rates compared to acyclic females. Therefore, it was hypothesized that a...

Author(s)
Monn, R. E.; Poole, R. K.; Mackey, J. C.; Mayberry, K. J.; Dudley, H. B.; Alley, M.; Poole, D. H.
Publisher
Oxford University Press, Oxford, UK
Citation
Translational Animal Science, 2019, 3, 1, pp 456-463
Abstract

Prostaglandin F (PGF) is commonly injected intramuscularly (IM) in female cattle in synchronization protocols. A novel site for administration of PGF that improves beef quality assurance is the ischiorectal fossa (IRF). The objective of this study was to determine whether administration of...

Author(s)
Holland, S. C.; Whittier, W. D.; Clark, S. G.; Hafez, S. A.; Swecker, W. S.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2018, 198, pp 11-19
Abstract

Interferon-tau (IFNτ) is the conceptus derived specific early pregnancy signal in bovidae. Locally, IFNτ induces an IFNτ specific gene expression (ISG) in endometrial cells and by this it averts luteolysis of the corpus luteum (CL) by suppressing prostaglandin production. Moreover, it was shown...

Author(s)
Ruhmann, B.; Giller, K.; Hankele, A. K.; Ulbrich, S. E.; Schmicke, M.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 104, pp 198-204
Abstract

Effects of phytoestrogen isoflavones in Berseem clover on hormonal balance during early pregnancy and fertility of heifers were studied. Holstein heifers (n=26) were divided into two equal homogenous groups. Heifers in the first group (Clover-fed group) were fed Egyptian clover (Trifolium...

Author(s)
Hashem, N. M.; El-Azrak, K. M.; Sallam, S. M. A.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2016, 170, pp 121-127
Abstract

The objective of this work was to evaluate the effect of two synchronization methods with prostaglandins F2α (PGF2α) on heifers and multiparous cows. Fourty-three Bos indicus cows (white and Red Fulani) were divided into four groups in a two-by-two factorial structure, parity x method of...

Author(s)
Bayemi, P. H.; Leinyuy, I.; Nsongka, M. V.; Webb, E. C.; Nchadji, J. M.; Cavestany, D.; Perera, B. M. A. O.
Publisher
Springer, Amsterdam, Netherlands
Citation
Tropical Animal Health and Production, 2015, 47, 1, pp 159-162
Abstract

The aim of this study was to investigate the effects on follicle stimulating hormone (FSH) secretion and dominant follicle (DF) growth, of treatment of Bos indicus heifers with different combinations of intra-vaginal progesterone releasing devices (IPRD), oestradiol benzoate (ODB), PGF and eCG....

Author(s)
Edwards, S. A. A.; Phillips, N. J.; Boe-Hansen, G. B.; Bo, G. A.; Burns, B. M.; Dawson, K.; McGowan, M. R.
Publisher
Elsevier Ltd, Oxford, UK
Citation
Animal Reproduction Science, 2013, 137, 3/4, pp 129-136
Abstract

To determine whether glucocorticoids affect the function of the bovine corpus luteum (CL) during the estrous cycle and early pregnancy, we examined the effects of exogenous cortisol or reduced endogenous cortisol on the secretion of progesterone (P4) and on pregnancy rate. In preliminary...

Author(s)
Hai Thanh Duong; Piotrowska-Tomala, K. K.; Acosta, T. J.; Bah, M. M.; Sinderewicz, E.; Majewska, M.; Jankowska, K.; Okuda, K.; Skarzynski, D. J.
Publisher
Society for Reproduction and Development, Tokyo, Japan
Citation
Journal of Reproduction and Development, 2012, 58, 2, pp 223-230
Abstract

Embryonic losses contribute considerably to low pregnancy rates. Between d 8 and 17 after breeding, the conceptus secretes interferon-τ as a mechanism for maternal recognition of pregnancy and maintenance of the corpus luteum. Nonsteroidal antiinflammatory drugs inhibit the synthesis of...

Author(s)
Krueger, X. von; Heuwieser, W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2010, 93, 11, pp 5140-5146
Abstract

The objective was to compare pregnancy rates in nulliparous Holstein heifers given PGF 24 h before, or concurrent with, removal of an intravaginal progesterone-releasing (CIDR) insert in 3 timed artificial insemination (TAI) protocols. Heifers (from 2 herds) were assigned randomly, over 11 mo, to ...

Author(s)
Ambrose, D. J.; Emmanuel, D. G. V.; Colazo, M. G.; Kastelic, J. P.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 7, pp 2678-2683

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