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Biomedical subjects

H A Jacobson

Publications and source records attributed to H A Jacobson.

13 recordsLinked to original sources
PubMed1989

Embryo transfer in the White-tailed deer: A reproductive model for endangered deer species of the world.

A model for artificial propagation of wild, seasonal breeding deer was developed using the White-tailed deer, Odocoileus , virginianus . Preseason estrus induction following removal of vaginal pessaries containing medroxyprogesterone acetate (MPA) was successful in four of seven animals. Synchronization of estrus was achieved in seven of nine attempts when does were treated with prostaglandin F(2) alpha (PGF(2)alpha) 7 to 14 d following observed estrus. Superovulation was achieved in two of five does treated with 1000 IU of pregnant mare's serum gonadotropin (PMSG) at the time of vaginal pessary MPA withdrawal. Superovulation was achieved in two of three does treated with 1000 IU of PMSG at the time of estrus induction with PGF(2)alpha. Surgical embryo recoveries attempted on six does resulted in a 68% embryo recovery rate based on numbers of corpora lutea observed. Surgical embryo transfers from two donors to three recipient does resulted in one pregnancy maintained to full term.

Journal Article↗
PubMed1987

Effects of season and area on ectoparasites of white-tailed deer (Odocoileus virginianus) in Mississippi.

Nine species of ectoparasites (4 Acari, 2 Mallophaga, 1 Anoplura, 1 Diptera, and 1 Siphonaptera) were recovered from 126 white-tailed deer collected in northern, central, and southern Mississippi. Intensity and prevalence of adults of Ixodes scapularis and larvae, nymphs, and adults of Amblyomma americanum varied significantly over collection periods, but not between host sexes. Lipoptena mazamae occurred on deer from only one study area. Although individual deer were heavily parasitized by Tricholipeurus parallelus and T. lipeuroides, their prevalence was limited. Hoplopsyllus sp., Solenopotes sp., Amblyomma maculatum, and Dermacentor albipictus had prevalences of less than 10% and were not tested for area, host sex, and seasonal effects. The potential pathogenicity of these ectoparasite species are related to white-tailed deer in Mississippi.

Animals↗
PubMed1981

Prevalence of Cuterebra emasculator in squirrels in Mississippi.

Between 1977 and 1979, 1,997 gray squirrels (Scriurus carolinensis) and 290 fox squirrels (S. niger) were examined for Cuterebra emasculator myiasis. Approximately 19% of the gray and 5% of the fox squirrels were infested with 1.9 and 2.5 larvae per host, respectively. Myiasis was seen between 14 August and 29 October. Peak infestations occurred in the second week of September. Adult and subadult squirrels had higher infestations than juveniles. Multiple infestations occurred in 51% of the hosts. Larval development sites were most prevalent in the axillary and back regions. The parasite was most prevalent in bottomland or flatland topography and hardwood habitat in east-central Mississippi. Fecundity of four virgin female flies averaged 771 eggs.

Animals↗
PubMed1979

Prevalence of parasitism by Amblyomma americanum on wild turkey poults as influenced by prescribed burning.

Captive-raised eastern wild turkey (Meleagris gallopavo silvestris) poults were allowed to forage on either recently burned plots or on plots that had not been burned during the previous 3 years. Following a two hour exposure on the study plots, external parasites were recovered from all poults. The louse (Menacanthus stramineus) and the lone star tick (Amblyomma americanum) were the only parasites recovered. Fifty-nine poults exposed to the burned plots had a significantly (P less than 0.001) lower prevalence of A. americanum infestation than did 57 poults exposed to the unbured plots. Thirty-five percent of the poults exposed to the unburned plots were infested by A. americanum. A single A. americanum was recovered from one poult exposed to burned plots.

Animals↗
PubMed1978

Bot fly myiasis of the cottontail rabbit, Sylvilagus floridanus mallurus in Virginia with some biology of the parasite, Cuterebra buccata.

Twenty four percent of 2,643 cottontail rabbits (Sylvilagus floridanus) collected in Virginia from 1949-1975 showed evidence of Cuterebra parasitism. Occurrence was seasonal with greatest prevalence from July to November. Some Oryctolagus cuniculus, S. palustris and one S. transitionalis also showed Cuterebra myiasis. Juvenile rabbits had higher infection rates (28%) than did adult rabbits 14.5%, P less than .001). Juveniles had greater numbers of larvae per host than adults, with means of 2.14 and 1.62, respectively. Larval development sites were in the genital region of most hosts. Twenty flies reared from wild cottontails were identified as C. buccata. Duration of induced infections in Oryctalagus was 30-33 days. Minimal generation time for C. buccata is concluded to be 11 weeks, allowing up to four generations of flies to occur annually in the southern and one generation to occur in the northern distributional limits of this bot fly. Peromyscus hosts were refractory to C. buccata infections. C. buccata fecundity averaged 1316 eggs. Field observations of adult flies are described.

Animals↗
PubMed1978

Hematologic comparisons of shot and live trapped cottontail rabbits.

Comparisons were made between hematologic measurements of shot and box-trapped cottontail rabbits (Sylvilagus floridanus). Trapped rabbits had significantly (P less than 0.001) higher serum corticoid levels and segmented neutrophil percentages and significantly (P less than 0.001) lower lymphocyte percentages than did shot rabbits. Trapped rabbits also had significantly (P less than 0.05) higher packed cell volumes and blood urea nitrogen values than did shot rabbits.

Adrenal Cortex Hormones↗
PubMed1976

Epizootiology of an outbreak of cerebrospinal nematodiasis in cottontail rabbits and woodchucks.

An epizootic of cerebrospinal nematodiasis in cottontail rabbits (Sylvilagus floridanus) and woodchucks (Marmota monax) caused by Baylisascaris procyonis larvae followed the establishment of an ascarid-infected raccoon (Procyon lotor) population in a woodlot. Five of seven raccoons examined from the woodlot harbored ascarids, with one heavily infected animal shedding approximately 27,500 eggs per gram of feces. A laboratory-reared cottontail rabbit developed neurologic disease due to larval migration 80 days after infection with B. procyonis eggs from the raccoons.

Animals↗
PubMed1975

An epizootic of cerebrospinal nematodiasis in cottontail rabbits.

A progressively debilitating neurologic syndrome characterized by torticollis, ataxia, circling, and abnormal posture was observed in 16 of approximately 60 cottontail rabbits (Sylvilagus floridanus) captured in a 12-hectare portion of a woodlot in southwestern Virginia. Inflammatory and degenerative alterations in cerebellum and midbrain regions were characterized principally by malacia, perivascular cuffing, and gliosis. Single Ascaris columnaris larvae were found in the cerebellum of 2 rabbits and the spinal cord of 1 rabbit.

Animals↗
PubMed1975

Ectopic fetuses in two cottontail rabbits.

Mummified fetuses were discovered in the abdominal cavities of two cottontail rabbits (Sylvilagus floridanus) collected during separate years from the same geographical location in Virginia. One of these rabbits had a patent opening through the vaginal wall to the abdominal cavity. The uterus and vagina of the second rabbit appeared normal.

Animals↗
PubMedDate not supplied

Sex linkage of minisatellite bands in bobcats (Felis rufus).

Minisatellite DNA profiles using the multilocus human probe 33.6 are presented for 27 captive bobcats (Felis rufus) of documented geographic and genetic origins. The results show that 30% of the finger-printing bands present in males are sex linked. The effect of sex on band sharing was attributed to the presence of male-specific hemizygotic bands belonging to a minisatellite cluster located in the nonrecombinant region of the Y chromosome. A combination of mechanisms might drive the dynamics of minisatellite loci and allow different evolutionary rates depending on the recombinational capability of the chromosomal locations involved. We discuss the utility of sex-linked fingerprinting bands as genetic markers for the study and management of bobcats.

Animals↗