Zobrazeno 1 - 10
of 11
pro vyhledávání: '"Donald G. Levis"'
Publikováno v:
Theriogenology. 70:1202-1208
This survey included 44 boar studs from Canada and the USA with a total of approximately 10,000 boars. Studs with 51-500 boars accounted for 84% of respondents. More than 90% of boars were housed in stalls. Evaporative and mechanical cooling systems
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab7ef36eda82e00414ca58fcd9f5860d
https://doi.org/10.1016/j.theriogenology.2008.06.036
https://doi.org/10.1016/j.theriogenology.2008.06.036
Autor:
Robert V. Knox, T. J. Safranski, W. L. Singleton, N. L. Sloter, K. A. Mcnamara, T. J. Gall, Donald G. Levis, S. L. Rodriguez Zas
Publikováno v:
Journal of animal science. 91(1)
A survey was performed to assess whether reproductive management differed among small-sized (Sm,500 sows), medium-sized (M, 501 to 2,000 sows), and large-sized (Lg, 2,001 to 8,000 sows) farms (n=113). Farms with 501 to 4000 sows/barn were most freque
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c5d6b0e8fc0d7611107fe1745dcf7b0
https://pubmed.ncbi.nlm.nih.gov/23097401
https://pubmed.ncbi.nlm.nih.gov/23097401
Autor:
Darwin L. Reicks, Donald G. Levis
Publikováno v:
Theriogenology. 70(8)
The objective was to monitor sperm counts and bacterial presence on randomly pooled semen doses over 3y and to determine effects on the farrowing rate and total born in two large farm systems, each serviced by their own boar stud. Sperm counts were d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ecd89559b5b49117ea884a1c76802764
https://pubmed.ncbi.nlm.nih.gov/18768216
https://pubmed.ncbi.nlm.nih.gov/18768216
Autor:
Donald G. Levis, Darwin L. Reicks
Publikováno v:
Theriogenology. 63(2)
The importance of sexual behavior and factors influencing sexual behavior of AI boars has received minimal study. The majority of studies reviewed used a very small number of boars. A sexual behavior index (SBI) has been developed for naturally matin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d4f07e332546127e51f0a529212a818
https://pubmed.ncbi.nlm.nih.gov/15626421
https://pubmed.ncbi.nlm.nih.gov/15626421
Publikováno v:
Journal of animal science. 75(2)
This study used three separate methods to evaluate sexual behavior in boars previously classified as having high (H), intermediate (INT), or low (L) levels of sexual behavior. Boars were initially evaluated for sexual behavior at 9.6 to 10.6 mo of ag
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::425eca720abe089dffc8f066148e160f
https://pubmed.ncbi.nlm.nih.gov/9051457
https://pubmed.ncbi.nlm.nih.gov/9051457
Autor:
Donald G. Levis, Jack H. Britt
Publikováno v:
Theriogenology. 18:201-207
Sows on two commerical farms were assigned to have their pigs weaned after a 3-week lactation (control, n=160) or after a 3-week lactation that included a 48-hr period of interrupted nursing before weaning (altered-suckling, n=122). Sows in the alter
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c04f12c64bc9d0767bb7590d6de2e6d2
https://doi.org/10.1016/0093-691x(82)90104-2
https://doi.org/10.1016/0093-691x(82)90104-2
Publikováno v:
Applied Engineering in Agriculture. 3:178-182
TWO modified-open-front non-mechanically ventilat-ed farrowing houses with creep boxes were operated over a two year period. Annual energy requirements were in the range of 10.6 to 10.9 cents per crate per day. No adverse effects on pig performance w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7bee8a2d6c4df5dfd4e29aa0a5b3243e
https://doi.org/10.13031/2013.26668
https://doi.org/10.13031/2013.26668
Publikováno v:
Theriogenology. 20(1)
Data were from 3119 farrowings in three large swine confinement units in eastern North Carolina. Litters were weaned during April through October. Interval to first estrus after weaning was greater during June through September than during other mont
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a519ae9a3d69de095ba44a8a49ce13d2
https://pubmed.ncbi.nlm.nih.gov/16725840
https://pubmed.ncbi.nlm.nih.gov/16725840
Autor:
Donald G. Levis, J. Joe Ford
Publikováno v:
Hormones and behavior. 23(3)
The objectives of these studies were to evaluate the influence of testosterone propionate (TP), estradiol cypionate (EC), dihydrotestosterone propionate (DHTP), EC + TP, EC + DHTP, and TP + DHTP on traits of masculine sexual behavior in castrated adu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8f778d1a3585221398fcf8dbb5088db6
https://pubmed.ncbi.nlm.nih.gov/2793080
https://pubmed.ncbi.nlm.nih.gov/2793080
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