Robert Victor Knox

1991 …2019
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Research Output 1991 2019

2019
Open Access
endocrinology
Follicular Phase
Endocrinology
Estrus
Ovulation
2018

Design and biological effects of a vaginally administered gel containing the GnRH agonist, triptorelin, for synchronizing ovulation in swine

Knox, R. V., Stewart, K. R., Flowers, W. L., Swanson, M. E., Webel, S. K. & Kraeling, R. R., May 2018, In : Theriogenology. 112, p. 44-52 9 p.

Research output: Contribution to journalArticle

Triptorelin Pamoate
Ovulation
Weaning
Gonadotropin-Releasing Hormone
agonists

Differential gene expression of Eph-ephrin A1 and LEPR-LEP with high or low number of embryos in pigs during implantation

Fu, Y., Knox, R. V., Li, L. & Ren, S., Aug 2018, In : Reproduction in Domestic Animals. 53, 4, p. 937-946 10 p.

Research output: Contribution to journalArticle

Ephrin-A1
embryo (animal)
Swine
Embryonic Structures
Gene Expression

Ovulation and fertility responses for sows receiving once daily boar exposure after weaning and OvuGel ® followed by a single fixed time post cervical artificial insemination

Ulguim, R. R., Bortolozzo, F. P., Wentz, I., Johnston, M., Webel, S. K., Arend, L. & Knox, R. V., Jan 1 2018, In : Theriogenology. 105, p. 27-33 7 p.

Research output: Contribution to journalArticle

Artificial Insemination
Ovulation
Weaning
boars
artificial insemination
2017

Effect of numbers of sperm and timing of a single, post-cervical insemination on the fertility of weaned sows treated with OvuGel®

Knox, R. V., Esparza-Harris, K. C., Johnston, M. E. & Webel, S. K., Apr 1 2017, In : Theriogenology. 92, p. 197-203 7 p.

Research output: Contribution to journalArticle

Sperm Count
Insemination
insemination
Fertility
sows

Effects of estrus synchronization using Matrix® followed by treatment with the GnRH agonist triptorelin to control ovulation in mature gilts

Knox, R. V., Webel, S. K., Swanson, M., Johnston, M. E. & Kraeling, R. R., Oct 2017, In : Animal reproduction science. 185, p. 66-74 9 p.

Research output: Contribution to journalArticle

Triptorelin Pamoate
Estrus Synchronization
estrus synchronization
Estrus
Ovulation
2016

Artificial insemination in pigs today

Knox, R. V., Jan 1 2016, In : Theriogenology. 85, 1, p. 83-93 11 p.

Research output: Contribution to journalArticle

Artificial Insemination
artificial insemination
Swine
swine
Spermatozoa
Artificial Insemination
Semen
artificial insemination
profitability
semen

Effect of timing of relocation of replacement gilts from group pens to individual stalls before breeding on fertility and well-being

Knox, R. V., Shen, J., Greiner, L. L. & Connor, J. F., Dec 2016, In : Journal of animal science. 94, 12, p. 5114-5121 8 p.

Research output: Contribution to journalArticle

gilts
Breeding
Fertility
breeding
Estrus
2015

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

Daigneault, B. W., Mcnamara, K. A., Purdy, P. H., Krisher, R. L., Knox, R. V., Rodriguez-Zas, S. L. & Miller, D. J., May 1 2015, In : Andrology. 3, 3, p. 558-568 11 p.

Research output: Contribution to journalArticle

Fertility
Spermatozoa
Artificial Insemination
Acrosome
Herpes Zoster

Genetic gain and economic values of selection strategies including semen traits in three- and four-way crossbreeding systems for swine production

González-Peña, D., Knox, R. V., Macneil, M. D. & Rodriguez-Zas, S. L., Mar 31 2015, In : Journal of animal science. 93, 3, p. 879-891 13 p.

Research output: Contribution to journalArticle

Genetic Hybridization
Semen
economic valuation
genetic improvement
semen

The effect of extender, method of thawing, and duration of storage on in vitro fertility measures of frozen-thawed boar sperm

Knox, R. V., Ringwelski, J. M., McNamara, K. A., Aardsma, M. & Bojko, M., Jan 1 2015, In : Theriogenology. 84, 3, p. 407-412 6 p.

Research output: Contribution to journalArticle

boars
thawing
Fertility
Spermatozoa
storage time

The fertility of frozen boar sperm when used for artificial insemination

Knox, R. V., Jan 1 2015, In : Reproduction in Domestic Animals. 50, p. 90-97 8 p.

Research output: Contribution to journalReview article

Artificial Insemination
boars
artificial insemination
Fertility
Spermatozoa
2014

Effect of day of mixing gestating sows on measures of reproductive performance and animal welfare

Knox, R. V., Johnson, J. L., Hopgood, M., Greiner, L. & Connor, J., Apr 2014, In : Journal of animal science. 92, 4, p. 1698-1707 10 p.

Research output: Contribution to journalArticle

Animal Welfare
animal welfare
Breeding
sows
reproductive performance

Effects of altering the dose and timing of triptorelin when given as an intravaginal gel for advancing and synchronizing ovulation in weaned sows

Knox, R. V., Taibl, J. N., Breen, S. M., Swanson, M. E. & Webel, S. K., Aug 2014, In : Theriogenology. 82, 3, p. 379-386 8 p.

Research output: Contribution to journalArticle

Triptorelin Pamoate
Ovulation
sows
ovulation
Estrus

Impact of pig insemination technique and semen preparation on profitability

Gonzalez-Peña, D., Knox, R. V., Pettigrew, J. & Rodriguez-Zas, S. L., Jan 2014, In : Journal of animal science. 92, 1, p. 72-84 13 p.

Research output: Contribution to journalArticle

Insemination
Semen
insemination
profitability
Semen Preservation

Impact of swine reproductive technologies on pig and global food production

Knox, R. V., 2014, Current and Future Reproductive Technologies and World Food Production. Springer New York LLC, p. 131-160 30 p. (Advances in Experimental Medicine and Biology; vol. 752).

Research output: Chapter in Book/Report/Conference proceedingChapter

Reproductive Techniques
Swine
Food
Developing countries
Fertility

Mortality, morbidity, and fertility after accidental electrical shock in a swine breeding and gestation barn

Knox, R. V., Shipley, C. F., Bressner, G. E. & Jarrell, V. L., Jan 1 2014, In : Journal of Swine Health and Production. 22, 6, p. 300-305 6 p.

Research output: Contribution to journalArticle

livestock breeding
barns
Parity
Breeding
Fertility

Novel and traditional traits of frozen-thawed porcine sperm related to in vitro fertilization success

Daigneault, B. W., McNamara, K. A., Purdy, P. H., Krisher, R. L., Knox, R. V. & Miller, D. J., Jul 15 2014, In : Theriogenology. 82, 2, p. 266-273 8 p.

Research output: Contribution to journalArticle

in vitro fertilization
Fertilization in Vitro
Spermatozoa
Swine
spermatozoa

The effect of numbers of frozen-thawed boar sperm and addition of prostaglandin F 2 α at insemination on fertility in pigs

Knox, R. V. & Yantis, B. M., Jan 1 2014, In : Animal reproduction science. 151, 3-4, p. 194-200 7 p.

Research output: Contribution to journalArticle

Insemination
Prostaglandins F
boars
insemination
prostaglandins
2013

An analysis of survey data by size of the breeding herd for the reproductive management practices of North American sow farms

Knox, R. V., Rodriguez-Zas, S. L., Sloter, N. L., McNamara, K. A., Gall, T. J., Levis, D. G., Safranski, T. J. & Singleton, W. L., Jan 1 2013, In : Journal of animal science. 91, 1, p. 433-445 13 p.

Research output: Contribution to journalArticle

Practice Management
Breeding
sows
herds
farms

Effect of interval between inseminations when using frozen-thawed boar sperm on fertility and fetal paternity in mature gilts

Ringwelski, J. M., Beever, J. E. & Knox, R. V., Mar 1 2013, In : Animal reproduction science. 137, 3-4, p. 197-204 8 p.

Research output: Contribution to journalArticle

Artificial Insemination
Insemination
paternity
boars
artificial insemination
Litter Size
Insemination
Ovulation
paternity
boars
Litter Size
Insemination
Ovulation
paternity
boars

Effect of variability in lighting and temperature environments for mature gilts housed in gestation crates on measures of reproduction and animal well-being

Canaday, D. C., Salak-Johnson, J. L., Visconti, A. M., Wang, X., Bhalerao, K. & Knox, R. V., Mar 1 2013, In : Journal of animal science. 91, 3, p. 1225-1236 12 p.

Research output: Contribution to journalArticle

animal well-being
crates
Lighting
gilts
Reproduction
2012
follicular development
Estrus
luteinizing hormone
Luteinizing Hormone
Ovulation
2011

Synchronization of ovulation and fertility in weaned sows treated with intravaginal triptorelin is influenced by timing of administration and follicle size

Knox, R. V., Willenburg, K. L., Rodriguez-Zas, S. L., Greger, D. L., Hafs, H. D. & Swanson, M. E., Jan 15 2011, In : Theriogenology. 75, 2, p. 308-319 12 p.

Research output: Contribution to journalArticle

Triptorelin Pamoate
Ovulation
Fertility
sows
ovulation

The current value of frozen-thawed boar semen for commercial companies

Knox, R. V., Sep 1 2011, In : Reproduction in Domestic Animals. 46, SUPPL. 2, p. 4-6 3 p.

Research output: Contribution to journalArticle

Semen Preservation
Semen
boars
semen
Fertility

Vulvar skin temperature changes significantly during estrus in swine as determined by digital infrared thermography

Scolari, S. C., Clark, S. G., Knox, R. V. & Tamassia, M. A., May 1 2011, In : Journal of Swine Health and Production. 19, 3, p. 151-155 5 p.

Research output: Contribution to journalReview article

thermography
skin temperature
Skin Temperature
Estrus
estrus
2010

Effect of number of motile, frozen-thawed boar sperm and number of fixed-time inseminations on fertility in estrous-synchronized gilts

Spencer, K. W., Purdy, P. H., Blackburn, H. D., Spiller, S. F., Stewart, T. S. & Knox, R. V., Sep 1 2010, In : Animal reproduction science. 121, 3-4, p. 259-266 8 p.

Research output: Contribution to journalArticle

Sperm Count
Insemination
boars
gilts
Estrus

Triennial Reproduction Symposium: challenges and opportunities facing livestock reproduction in the 21st century.

Knox, R. V., Day, M. L., Lewis, G. S., Lucy, M. C. & Vonnahme, K. A., Apr 2010, In : Journal of animal science. 88, 13 Suppl

Research output: Contribution to journalEditorial

Animal Husbandry
Domestic Animals
animal husbandry
Livestock
domestic animals
2009

Assessment of follicle population changes in sows from day of weaning and during estrus using real-time ultrasound.

Knox, R., Taibl, J., Altmyer, M., Breen, S., Canaday, D. & Visconti, A., 2009, In : Society of Reproduction and Fertility supplement. 66, p. 199-200 2 p.

Research output: Contribution to journalArticle

Ovarian Follicle
Estrus
Ovulation
Weaning
Oocytes
2008

An update on North American boar stud practices

Knox, R. V., Levis, D., Safranski, T. & Singleton, W., Nov 1 2008, In : Theriogenology. 70, 8, p. 1202-1208 7 p.

Research output: Contribution to journalArticle

boars
Spermatozoa
Semen
Semen Analysis
Sperm Count
2006

Effect of altering dose of PG600 on reproductive performance responses in prepubertal gilts and weaned sows

Breen, S. M., Rodriguez-Zas, S. L. & Knox, R. V., Oct 1 2006, In : Animal reproduction science. 95, 3-4, p. 316-323 8 p.

Research output: Contribution to journalArticle

Estrus
gilts
sows
reproductive performance
Ovulation

Effect of PG600 and adjusted mating times on reproductive performance in weaned sows

Breen, S. M., Rodriguez-Zas, S. L. & Knox, R. V., Jun 1 2006, In : Animal reproduction science. 93, 1-2, p. 157-164 8 p.

Research output: Contribution to journalArticle

Artificial Insemination
Estrus
artificial insemination
sows
reproductive performance

Evaluation of methodology for administration of porcine FSH for use in estrus induction and for increasing ovulation rate in prepubertal gilts

Jackson, A. L., Breen, S. M., Rodriguez-Zas, S. L. & Knox, R. V., Sep 1 2006, In : Theriogenology. 66, 4, p. 1042-1047 6 p.

Research output: Contribution to journalArticle

Ovulation Induction
Estrus
Ovulation
gilts
ovulation

Impact of biological and economic variables on optimal parity for replacement in swine breed-to-wean herds

Rodriguez-Zas, S. L., Davis, C. B., Ellinger, P. N., Schnitkey, G. D., Romine, N. M., Connor, J. F., Knox, R. V. & Southey, B. R., Sep 1 2006, In : Journal of animal science. 84, 9, p. 2555-2565 11 p.

Research output: Contribution to journalArticle

swine breeds
parity (reproduction)
Parity
Swine
herds

Induction of Estrus and Control of the Estrous Cycle in Swine

Knox, R. V. & Wilson, W. D., Oct 1 2006, Current Therapy in Large Animal Theriogenology: Second Edition. Elsevier Inc., p. 757-764 8 p.

Research output: Chapter in Book/Report/Conference proceedingChapter

Estrous Cycle
Estrus
estrous cycle
estrus
Swine
2005

Effect of age and physical or fence-line boar exposure on estrus and ovulation response in prepubertal gilts administered PG600

Breen, S. M., Farris, K. L., Rodriguez-Zas, S. L. & Knox, R. V., Feb 1 2005, In : Journal of animal science. 83, 2, p. 460-465 6 p.

Research output: Contribution to journalArticle

fences
Estrus
Ovulation
boars
gilts

Recruitment and selection of ovarian follicles for determination of ovulation rate in the pig

Knox, R. V., Aug 1 2005, In : Domestic Animal Endocrinology. 29, 2, p. 385-397 13 p.

Research output: Contribution to journalArticle

Ovarian Follicle
ovarian follicles
Ovulation
ovulation
Swine
2004
Dinoprost
Ovulation
blood serum
prostaglandins
estrogens

Effect of housing system and boar exposure on estrus expression in weaned sows

Knox, R. V., Breen, S. M., Willenburg, K. L., Roth, S., Miller, G. M., Ruggiero, K. M. & Rodriguez-Zas, S. L., Oct 1 2004, In : Journal of animal science. 82, 10, p. 3088-3093 6 p.

Research output: Contribution to journalArticle

Estrus
boars
sows
estrus
Estrus Detection

Evaluation of transrectal real-time ultrasound for use in identifying sources of reproductive failure in weaned sows

Knox, R. V. & Probst-Miller, S., Mar 1 2004, In : Journal of Swine Health and Production. 12, 2, p. 71-74 4 p.

Research output: Contribution to journalReview article

Estrus
sows
Estrus Detection
estrus
Ovulation
2003

Bioeconomic evaluation of sow longevity and profitability

Rodriguez-Zas, S. L., Southey, B. R., Knox, R. V., Connor, J. F., Lowe, J. F. & Roskamp, B. J., Dec 2003, In : Journal of Animal Science. 81, 12, p. 2915-2922 8 p.

Research output: Contribution to journalArticle

bioeconomics
profitability
sows
genetic lines
herds

Characterization of image and labor requirements for positive pregnancy diagnosis in swine using two methods of real-time ultrasound

Miller, G. M., Breen, S. M., Roth, S. L., Willenburg, K. L., Rodriguez-Zas, S. & Knox, R. V., Sep 1 2003, In : Journal of Swine Health and Production. 11, 5, p. 233-239 7 p.

Research output: Contribution to journalReview article

pregnancy diagnosis
sows
labor
Swine
Pregnancy

Effect of boar exposure at time of insemination on factors influencing fertility in gilts

Willenburg, K. L., Miller, G. M., Rodriguez-Zas, S. L. & Knox, R. V., Jan 2003, In : Journal of Animal Science. 81, 1, p. 9-15 7 p.

Research output: Contribution to journalArticle

Artificial Insemination
Insemination
boars
artificial insemination
gilts
uterine contraction
Uterine Contraction
Artificial Insemination
Semen
artificial insemination

Plasma gonadotropins and ovarian hormones during the estrous cycle in high compared to low ovulation rate gilts

Knox, R. V., Vatzias, G., Naber, C. H. & Zimmerman, D. R., Jan 1 2003, In : Journal of animal science. 81, 1, p. 249-260 12 p.

Research output: Contribution to journalArticle

Estrous Cycle
gonadotropins
Ovulation
Gonadotropins
gilts
2002

Effect of frequency of boar exposure and adjusted mating times on measures of reproductive performance in weaned sows

Knox, R. V., Miller, G. M., Willenburg, K. L. & Rodriguez-Zas, S. L., Apr 2002, In : Journal of animal science. 80, 4, p. 892-899 8 p.

Research output: Contribution to journalArticle

Estrus
boars
sows
estrus
reproductive performance
2001

Administration of P.G. 600 to sows at weaning and the time of ovulation as determined by transrectal ultrasound

Knox, R. V., Rodriguez-Zas, S. L., Miller, G. M., Willenburg, K. L. & Robb, J. A., Apr 2001, In : Journal of animal science. 79, 4, p. 796-802 7 p.

Research output: Contribution to journalArticle

Estrus
Ovulation
Weaning
sows
ovulation