PUBERTY IN SUFFOLK AND CROSS-BRED RAMS

Reproductive performance of Suffolk and Suffolk-cross ewes and ewe lambs exposed to vasectomized rams before breeding.

Multiparous Suffolk and Suffolk-cross ewes were randomly allotted to treatments within breed and year to measure effects of ram exposure, during transition from anestrus to breeding activity, on reproductive performance. Treatments were: 1) ewes joined with two mature vasectomized Rambouillet rams for 15 d before breeding (DC), 2) ewes maintained across a net wire fence from two vasectomized ra...

Pharmacokinetics and dosage regimen of cefpirome in febrile cross-bred calves

The pharmacokinetics of cefpirome after a single intravenous injection of 10 mg.kg -1 was studied in febrile cross-bred calves. E. coli endotoxin was administered intravenously to induce fever in calves. Blood samples were collected at different time intervals and cefpirome levels were estimated by using microbiological assay technique. Based on the plasma drug levels, the pharmacokinetic pa...

Responses of market lambs and Suffolk rams to a stimulatory skeleton photoperiod.

Young crossbred lambs and Suffolk rams were exposed to photoperiods stimulatory to growth or reproduction respectively. Whereas long days are known to facilitate rate of gain, feed efficiency and carcass yield in young market lambs, exposure to decreasing daylengths or short days is necessary for successful reproduction of the species. Successful substitution of a "skeleton" long photoperiod (7...

Kinetic disposition, urinary excretion and dosage regimen of subcutaneously administered levofloxacin in cross bred calves

The present study was conducted on five healthy male cross bred calves to study the kinetic dispositionand urinary excretion of levofloxacin following its single subcutaneous administration at the dose of4 mg.kg-1. The concentration of levofloxacin in plasma and urine samples was estimated by microbiologicalassay. Peak plasma level of levofloxacin (2.8 ± 0.3 μg.ml-1) was observed at 45 min and ...

Seasonal changes in sexual activity and serum levels of LH and testosterone in Finnish Landrace and Suffolk rams.