An update on North American boar stud practices

Knox, Robert V.; Levis, Donald G.; Safranski, Timothy J.; Singleton, W. L.

doi:10.1016/j.theriogenology.2008.06.036

Cited by 73 publications

(60 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In these facilities, boars are housed in pens or stalls with anywhere from 25 up to 2000 boars housed at an individual site [1,20,[33][34][35]. The facilities are designed to control the environment and management systems to optimize health and fertility of the sires [36][37][38].…”

Section: Boar Stud Management For Production Of Semenmentioning

confidence: 99%

“…Genetic suppliers at the nucleus level may test sires in short-term breeding evaluations and select sires on the basis of measures obtained in sequence for pregnancy rate; litter size; and offspring measures for survival, growth, and performance. Average sperm production ranges between 60 and 120 billion sperm per ejaculate [39,42], depending on collection interval and boar age, and resulting in 20 to 40 traditional AI doses or 40 to 60 low sperm doses [20,33]. Collection most often occurs using the gloved-hand technique [43], but new equipment for semiautomation has been developed to aid boar collection [44,45].…”

Section: Boar Stud Management For Production Of Semenmentioning

confidence: 99%

See 1 more Smart Citation

Artificial insemination in pigs today

2016

View full text Add to dashboard Cite

Section: Boar Stud Management For Production Of Semenmentioning

confidence: 99%

Section: Boar Stud Management For Production Of Semenmentioning

confidence: 99%

Artificial insemination in pigs today

2016

View full text Add to dashboard Cite

“…Some advantages include increased time to test for pathogens and fertility and additional time for distribution of semen with high genetic merit (Tribout et al, 2010;Knox, 2011). However, <1% of porcine AI use frozen-thawed boar spermatozoa because the economic advantages do not compensate for the reduction in fertility caused by cryopreservation damage (Johnson et al, 2000;Knox et al, 2008;Rath et al, 2009). Identifying cryopreserved ejaculates of acceptable fertility prior to use would be beneficial given the interest for enhancing the commercial use of frozen-thawed semen by the swine industry (Didion et al, 2013;McNamara & Knox, 2013;Ringwelski et al, 2013;Tom as et al, 2013;Estrada et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Enhanced fertility prediction of cryopreserved boar spermatozoa using novel sperm function assessment

Daigneault

McNamara

Purdy³

et al. 2015

Andrology

View full text Add to dashboard Cite

SUMMARYDue to reduced fertility, cryopreserved semen is seldom used for commercial porcine artificial insemination (AI). Predicting the fertility of individual frozen ejaculates for selection of higher quality semen prior to AI would increase overall success. Our objective was to test novel and traditional laboratory analyses to identify characteristics of cryopreserved spermatozoa that are related to boar fertility. Traditional post-thaw analyses of motility, viability, and acrosome integrity were performed on each ejaculate. In vitro fertilization, cleavage, and blastocyst development were also determined. Finally, spermatozoa-oviduct binding and competitive zonabinding assays were applied to assess sperm adhesion to these two matrices. Fertility of the same ejaculates subjected to laboratory assays was determined for each boar by multi-sire AI and defined as (i) the mean percentage of the litter sired and (ii) the mean number of piglets sired in each litter. Means of each laboratory evaluation were calculated for each boar and those values were applied to multiple linear regression analyses to determine which sperm traits could collectively estimate fertility in the simplest model. The regression model to predict the percent of litter sired by each boar was highly effective (p < 0.001, r 2 = 0.87) and included five traits;acrosome-compromised spermatozoa, percent live spermatozoa (0 and 60 min post-thaw), percent total motility, and the number of zona-bound spermatozoa. A second model to predict the number of piglets sired by boar was also effective (p < 0.05, r 2 = 0.57).These models indicate that the fertility of cryopreserved boar spermatozoa can be predicted effectively by including traditional and novel laboratory assays that consider functions of spermatozoa.

show abstract

“…To provide high quality insemination doses, routine assessment of the semen quality of the ejaculates is necessary. Although some AI centers may implement CASA in their routine semen assessment, semen quality analysis is mainly based on conventional techniques, i.e., concentration by photometer and visual evaluation of motility and morphology [Knox et al 2008;Vyt et al 2007]. The relation of these parameters with in vivo fertility is still under discussion [Tsakmakidis et al 2010;Vyt et al 2008].…”

Section: Introductionmentioning

confidence: 99%

Boar seminal plasma components and their relation with semen quality

Rodriguez

Rijsselaere

Beek

et al. 2012

Systems Biology in Reproductive Medicine

View full text Add to dashboard Cite

Select boar seminal plasma (SP) components and their relation to semen quality were investigated. Thirty nine boars from three artificial insemination (AI) centers were divided into group A (GA: > 80% normal sperm and >70% motility) and group B (GB: < 80% normal sperm and < 70% motility). Each ejaculate was collected and semen volume, concentration, sperm motility (computer aided semen analysis; CASA), morphology, and vitality (both eosin nigrosin staining) were investigated. The SP was separated and analyzed for aspartate-amino-transferase (AST), γ-glutamyl-transferase (GGT), alkaline phosphatase (ALP) activity, and the concentrations of sodium (Na), potassium (K), chloride (Cl), calcium (Ca), phosphate (PO 4 3-), magnesium (Mg), selenium (Se) and zinc (Zn) were assessed. Repeated measures (2 months interval) were conducted in eight boars of GA from one AI center. The activity of GGT (r = -0.482) and ALP (r = -0.459) was moderately associated ( p < 0.05) with ejaculate volume and strongly associated with concentration (r = 0.580 and r = 0.618, respectively; p = 0.000). Moderate associations ( p < 0.05) were found between ALP (r = 0.439), GGT (r = 0.387), Na (r = -0.428), K (r = 0.354), and Se (r = 0.354) with progressive motility. The SP concentration of Na (r = -0.401), Cl (r = -0.521), and K (r = 0.350) was associated ( p < 0.05) with normal morphology. Only Mg was associated ( p < 0.05) with membrane damage (r = -0.335). The concentration of Na, Cl, and Zn (1681.0 vs. 1701.0 µg/dL) was different between groups ( p < 0.05). Repeated measures showed significant differences in time but only for Na, Mg, and Zn ( p < 0.05). In conclusion, several biochemical components of SP were related to semen quality. The analysis of biochemical parameters could provide extra information about reproductive health of AI boars.

show abstract

An update on North American boar stud practices

Cited by 73 publications

References 2 publications

Artificial insemination in pigs today

Artificial insemination in pigs today

Enhanced fertility prediction of cryopreserved boar spermatozoa using novel sperm function assessment

Boar seminal plasma components and their relation with semen quality

Contact Info

Product

Resources

About