Two new oral chemical biomarkers for coyotes.

Pentachlorobenzene (PeCB) and 1,2,3,4-tetrachlorobenzene (TeCB) were evaluated as oral chemical biomarkers when administered to coyotes (Canis latrans) during the period of 31 January to 10 August 1994. Three coyotes each received 100 mg of PeCB and three received 100 mg of TeCB, each in a mineral oil formulation. Three additional coyotes received only the mineral oil carrier.

Acetylcholine levels, choline acetyltransferase and acetylcholinesterase molecular forms during thyroxine-induced cardiac hypertrophy.

The effects of left ventricular hypertrophy induced by hyperthyroidism on three biochemical markers of parasympathetic innervation were investigated. In response to subcutaneous injections of thyroxine (400 micrograms/kg; T4) for 6 days, the left ventricle, but not the right, developed significant hypertrophy (20%). In the enlarged left ventricle, acetylcholine (ACh) content and choline acetyltransferase (ChAT) activity per chamber were elevated approx.

Body size and condition of coyotes in southern Texas.

Body size and condition of coyotes (Canis latrans) from a high-density population in Webb County, Texas (USA) were analyzed for age, sex and seasonal differences during 1980 to 1986. Mean body mass was progressively greater for juvenile, yearling and adult coyotes. Males were heavier and longer than females in each age class.

Borrelia sp. infection in coyotes, black-tailed jack rabbits and desert cottontails in southern Texas.

Coyotes (Canis latrans) from southern Texas were sampled for antibodies to Borrelia burgdorferi from 1980 to 1986; black-tailed jack rabbits (Lepus californicus) and desert cottontails (Sylvilagus audubonii) were sampled in 1986. Coyote fetuses, adult coyote kidneys, and black-tailed jack rabbit and desert cottontail kidneys were cultured for B. burgdorferi in 1986.

Transmission of Ancylostoma caninum and Alaria marcianae in coyotes (Canis latrans).

One of seven female coyotes (Canis latrans) captured in Webb County, Texas during September 1986 and confined and mated in holding facilities at Millville, Utah whelped the following spring. The maternal female (greater than 5-yr-old) and her five neonates were killed at 22 days postparturition. All were infected with adult Ancylostoma caninum and were passing eggs in their feces.