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Abstract

The hypothesis of this study tested whether application of designed treatments to synchronize estrus in nonpregnant previously inseminated lactating dairy cows increased the proportion of nonpregnant cows in estrus before early pregnancy diagnosis on Day 32 after the previous insemination (Day 0)...

Author(s)
Stevenson, J. S.; Sauls-Hiesterman, J. A.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2021, 170, pp 54-66
Abstract

Estrus is an important behavior that can potentially be subjected to genomic selection. Circulating estradiol concentrations at estrus may be a useful phenotype if the absolute concentrations of estradiol are associated with overt phenotypes for estrus (activity, rump touches, or both; e.g.,...

Author(s)
Kumro, F. G.; Smith, F. M.; Yallop, M. J.; Ciernia, L. A.; Caldeira, M. O.; Moraes, J. G. N.; Poock, S. E.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2021, 104, 2, pp 2445-2454
Abstract

Using an activity monitoring system (AMS) equipped with an accelerometer, 2 experiments were conducted to test the hypotheses that (1) enhancing progesterone before inducing luteolysis or (2) exposing cows to estradiol cypionate (ECP) or testosterone propionate (TP) after luteolysis would increase...

Author(s)
Sauls, J. A.; Voelz, B. E.; Hill, S. L.; Mendonça, L. G. D.; Stevenson, J. S.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 1, pp 807-820
Abstract

Most Canadian dairy herds operate in tiestall housing (61%), where average estrus detection rates may be lower than 54%. The objective of this study was to evaluate infrared thermography and behavioral biometrics as indicators of estrus in dairy cows. Eighteen cyclic multiparous cows (Synch) were...

Author(s)
Marquez, H. J. P.; Ambrose, D. J.; Schaefer, A. L.; Cook, N. J.; Bench, C. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 5, pp 4427-4440
Abstract

The objective was to evaluate if expression of estrus by dairy cattle altered fertility in timed artificial insemination (AI; n=5,430) or timed embryo transfer (ET; n=2,003) programs that used estradiol and progesterone (P4) to synchronize ovulation. Ovarian ultrasonography was performed on d 0...

Author(s)
Pereira, M. H. C.; Wiltbank, M. C.; Vasconcelos, J. L. M.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2016, 99, 3, pp 2237-2247
Abstract

The objective of this study was to test whether prostaglandin (PG) injection on day 30 postpartum (pp) and detection of estrus can affect the efficacy of injecting PG on days 5 and 6 in the timed artificial insemination (TAI) protocol on pregnancy rate in a large dairy herd in hot or cold seasons....

Author(s)
Alnimer, M. A.; Abedal-Majed, M. A.; Shamoun, A. I.
Publisher
Copernicus Gesellschaft mbH, Gottingen, Germany
Citation
Archives Animal Breeding, 2019, 62, 1, pp 161-170
Abstract

This study investigated the effects of oral administration of pioglitazone (PGT), a specific and synthetic ligand of peroxisome proliferator-activated receptors gamma (PPARγ), on follicular dynamics and corpus luteum (CL) functionality in dairy cows. Cows exhibiting strong signs of estrus after 2...

Author(s)
Yousefi, A. R.; Kohram, H.; Shahneh, A. Z.; Zamiri, M. J.; Dirandeh, E.; Khoozani, M. K.; Davachi, N. D.; Zhandi, M.; Folladi-Nashta, A. A.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Livestock Science, 2019, 224, pp 50-56
AbstractFull Text

The present study was carried out to observe the effects of GnRH at the time of AI and mid luteal phase on conception rate in dairy cows. The cows were randomly divided in 4 treatment and 2 control groups. Group I (n=10) cows were injected with 10 μg Buserelin acetate intramuscularly at the time of ...

Author(s)
D'Silva, K. L.; Amle, M. B.; Rangnekar, M. N.; Mali, A. B.; Doiphode, A. Y.
Publisher
College of Veterinary Sciences, Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar, India
Citation
Haryana Veterinarian, 2020, 59, Special Issue, pp 34-37
AbstractFull Text

The goal of this review is to consider and discuss the scientific literature related to the effect of heat stress (HS) on reproductive performance in dairy cows and opportunities to reduce its effects. The information in literature shows that the HS topic in dairy cows began to be discussed in the...

Author(s)
Penev, T.; Dimov, D.; Vasilev, N.; Miteva, T.; Marinov, I.; Stojnov, M.
Publisher
Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria
Citation
Agricultural Science and Technology, 2021, 13, 1, pp 3-11
Abstract

A study was carried out under field conditions on 50 acyclic/anestrus and 50 cyclic/repeat breeder HF crossbred cows to evaluate the efficacy of four standard estrus induction/ovulation synchronization protocols, viz., Ov_synch (GPG), Ov_synch Plus (PMSG+GPG), Double_synch (P-GPG) and...

Author(s)
Prajapati, A. R.; Dhami, A. J.; Hadiya, K. K.; Patel, J. A.; Prajapati, J. P.
Publisher
Indian Dairy Association, New Delhi, India
Citation
Indian Journal of Dairy Science, 2019, 72, 2, pp 201-206

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