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Cow attributes, herd management, and reproductive history events associated with the risk of nonpregnancy in cow-calf herds in Western Canada.
Waldner CL, García Guerra A. Waldner CL, et al. Theriogenology. 2013 Apr 15;79(7):1083-94. doi: 10.1016/j.theriogenology.2013.02.004. Epub 2013 Mar 6. Theriogenology. 2013. PMID: 23473871
Cows least likely to be pregnant in the fall of the year were 10 years old or older, exposed to a bull less than 84 days, had a BCS ≤5 of 9 at pregnancy testing, <5 of 9 before calving, and lost condition between calving and the start of the breeding season, or h …
Cows least likely to be pregnant in the fall of the year were 10 years old or older, exposed to a bull less than 84 days, had a
Lengthening the superstimulatory treatment protocol increases ovarian response and number of transferable embryos in beef cows.
García Guerra A, Tribulo A, Yapura J, Singh J, Mapletoft RJ. García Guerra A, et al. Theriogenology. 2012 Jul 15;78(2):353-60. doi: 10.1016/j.theriogenology.2012.02.010. Epub 2012 Apr 10. Theriogenology. 2012. PMID: 22494674 Clinical Trial.
A dose of 400 mg NIH-FSH-P1 (Folltropin-V) was distributed equally over 8 (Control) or 14 (Long) im injections at 12-h intervals. ...In conclusion, a lengthened superstimulatory treatment protocol resulted in more follicles acquiring the capacity to ovulate with an
A dose of 400 mg NIH-FSH-P1 (Folltropin-V) was distributed equally over 8 (Control) or 14 (Long) im injections at 12-h intervals. ...
Sensitivity of a real-time polymerase chain reaction for Tritrichomonas fetus in direct individual and pooled preputial samples.
García Guerra A, Hill JE, Waldner CL, Campbell J, Hendrick S. García Guerra A, et al. Theriogenology. 2013 Dec;80(9):1097-103. doi: 10.1016/j.theriogenology.2013.08.011. Epub 2013 Sep 17. Theriogenology. 2013. PMID: 24054553
Two samples were collected and processed once a week from nine T. fetus-infected bulls (n = 121) and placed into either an InPouch TF or 2 mL of PBS. ...The prepuce samples collected directly into PBS were individually evaluated using real-time PCR by a commercial d …
Two samples were collected and processed once a week from nine T. fetus-infected bulls (n = 121) and placed into either an InPouch TF …
Application of a new diagnostic approach to a bovine genital campylobacteriosis outbreak in a Saskatchewan beef herd.
Waldner C, Hendrick S, Chaban B, Garcia Guerra A, Griffin G, Campbell J, Hill JE. Waldner C, et al. Can Vet J. 2013 Apr;54(4):373-6. Can Vet J. 2013. PMID: 24082165 Free PMC article.
A new real-time quantitative polymerase chain reaction (qPCR) test was used to diagnose Campylobacter fetus subsp. venerealis infection associated with dramatic reproductive losses in a commercial cow-calf herd. ...This case demonstrates the need for a practi
A new real-time quantitative polymerase chain reaction (qPCR) test was used to diagnose Campylobacter fetus subsp. venerealis infecti
Increase in average testis size of Canadian beef bulls.
García Guerra A, Hendrick S, Barth AD. García Guerra A, et al. Can Vet J. 2013 May;54(5):485-90. Can Vet J. 2013. PMID: 24155433 Free PMC article.
Scrotal circumference (SC) is highly correlated with paired testis weight and is a practical method for estimating testis weight in the live animal. ...
Scrotal circumference (SC) is highly correlated with paired testis weight and is a practical method for estimating testis weight in t …
Use of pooled protozoal cultures of preputial scraping samples obtained from bulls for the detection of Tritrichomonas foetus by means of a real-time polymerase chain reaction assay.
García Guerra A, Hill JE, Campbell J, Waldner CL, Hendrick SH. García Guerra A, et al. J Am Vet Med Assoc. 2014 Feb 1;244(3):352-6. doi: 10.2460/javma.244.3.352. J Am Vet Med Assoc. 2014. PMID: 24432968
OBJECTIVE: To determine the sensitivity of a real-time PCR assay for the detection of Tritrichomonas foetus in protozoal cultures of preputial scraping samples pooled from up to 25 bulls and to determine the specificity of that assay for detection of T foetus in cultures f …
OBJECTIVE: To determine the sensitivity of a real-time PCR assay for the detection of Tritrichomonas foetus in protozoal cultures of …
Lengthened superstimulatory treatment in cattle: Evidence for rescue of follicles within a wave rather than continuous recruitment of new follicles.
García Guerra A, Tribulo A, Yapura J, Adams GP, Singh J, Mapletoft RJ. García Guerra A, et al. Theriogenology. 2015 Aug;84(3):467-76. doi: 10.1016/j.theriogenology.2015.03.037. Epub 2015 Apr 20. Theriogenology. 2015. PMID: 25979656
A study was designed to compare the effects of a conventional (4 days) versus a lengthened (7 days) superstimulation protocol on follicle dynamics and to test the hypothesis that superstimulatory treatment only rescues small follicles within the wave. ...The
A study was designed to compare the effects of a conventional (4 days) versus a lengthened (7 days) superstimulation pr
Pivotal periods for pregnancy loss during the first trimester of gestation in lactating dairy cows.
Wiltbank MC, Baez GM, Garcia-Guerra A, Toledo MZ, Monteiro PL, Melo LF, Ochoa JC, Santos JE, Sartori R. Wiltbank MC, et al. Theriogenology. 2016 Jul 1;86(1):239-53. doi: 10.1016/j.theriogenology.2016.04.037. Epub 2016 Apr 22. Theriogenology. 2016. PMID: 27238438 Review.
Loss of pregnancy can occur at many different stages of gestation and for a variety of causes but clearly produces a negative impact for reproductive and economic performances of dairy herds. ...Similarly, strategies to reduce these losses are likely to require a
Loss of pregnancy can occur at many different stages of gestation and for a variety of causes but clearly produces a negative …
Follicular waves and hormonal profiles during the estrous cycle of carriers and non-carriers of the Trio allele, a major bovine gene for high ovulation and fecundity.
García-Guerra A, Kirkpatrick BW, Wiltbank MC. García-Guerra A, et al. Theriogenology. 2017 Sep 15;100:100-113. doi: 10.1016/j.theriogenology.2017.05.029. Epub 2017 Jun 1. Theriogenology. 2017. PMID: 28708524
A high fecundity bovine genotype has recently been discovered and genetic mapping indicates evidence for segregation of a major gene with influence on ovulation rate located on bovine chromosome 10. ...Despite a difference (P = 0.032) in the length of the est
A high fecundity bovine genotype has recently been discovered and genetic mapping indicates evidence for segregation of a majo
Postovulatory treatment with GnRH on day 5 reduces pregnancy loss in recipients receiving an in vitro produced expanded blastocyst.
García-Guerra A, Sala RV, Carrenho-Sala L, Baez GM, Motta JCL, Fosado M, Moreno JF, Wiltbank MC. García-Guerra A, et al. Theriogenology. 2020 Jan 1;141:202-210. doi: 10.1016/j.theriogenology.2019.05.010. Epub 2019 May 14. Theriogenology. 2020. PMID: 31606718
On D5 in the afternoon, heifers were assigned in a completely randomized design to one of two treatments: Control (untreated) or GnRH (200 μg). ...In conclusion, treatment with GnRH on D5 caused ovulation and formation of an accessory CL, increased circulating P4, and redu …
On D5 in the afternoon, heifers were assigned in a completely randomized design to one of two treatments: Control (untreated) or GnRH …
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